Questions Asked on
April 7, 2013

Chemistry
A solution containing a mixture of metal cations was treated with dilute HCl and no precipitate formed. Next, H2S was bubbled through the acidic solution. A precipitate formed and was filtered off. Then, the pH was raised to about 8 and H2S was again
asked by Brunost 
Calculus
Find a formula for the fourth degree polynomial p(x) whose graph is symmetric about the yaxis (meaning it has no odd powers of x), and which has a yintercept of 10, and global maxima at (3,253) and (−3,253).
asked by Dana 
precalculus
Solve 8sin(pi/4x) = 6 for the four smallest positive solutions Give your answers accurate to at least two decimal places, as a list separated by commas.
asked by Anonymous 
statistics
The weight of a small Starbucks coffee is a normally distributed random variable with a mean of 410 grams and a standard deviation of 10 grams. Find the weight that corresponds to each eventa. A.Highest 30 percent b. Middle 70 percent to c. Highest 90
asked by MD 
math  college algebra
If the rational function y = r(x) has the vertical asymptote x = 9, then as x →9+, either y → ____or _____
asked by mary 
Precalculus
Solve 8 sin(2 x) = 6 for the two smallest positive solutions A and B, with A < B Give your answers accurate to at least two decimal places.
asked by anonymous 
Chemistry
Which is the strongest acid, CCl3COOH or CH2ClCOOH please explain WHY it is stronger.
asked by m 
precalculus
Solve 5 cos(3 x) = 2 for the smallest three positive solutions. Give your answers accurate to at least two decimal places, as a list separated by commas
asked by Anonymous 
Physics
You drop a 1.60 kg book to a friend who stands on the ground at distance D = 12.0 m below. If your friend's outstretched hands are at distance d = 1.40 m above the ground (see the figure), (a) how much work Wg does the gravitational force do on the book as
asked by Ariana 
algebra
To balance a seesaw, the distance, in feet, a person is from the fulcrum is inversely proportional to the person's weight, in pounds. Peter, who weighs 150 pounds, is sitting 3 feet away from the fulcrum. If Joey weighs 90 pounds, how far from the fulcrum
asked by Alice 
Physics
A long coaxial cable consists of two concentric conductors. The inner conductor is a cylinder with radius R1, and it carries a current I0 uniformly distributed over its cross section. The outer conductor is a cylindrical shell with inner radius R2 and
asked by abdul rahman 
CHEMISTRY
THE SOLUBILITY PRODUCT CONSTANT FOR BaSO4 AT 298K IS 1.1X101O POWER. CALCULATE THE SOLUBILITY OF BaSO4 IN MOL\L AT 298K
asked by JASMIN 
Physics
A particle hangs from a spring and oscillates with a period of 0.2 s.If the massspring system remained at rest, by how much would the mass stretch it from its normal equilibrium position? The acceleration of gravity is 9.8 m/s^2
asked by Emily 
math
12x + 16y=1/5 & 13x + 24y =1/4,find value of x & y.
asked by rahul 
biology
(b) Is this pedigree consistent with autosomal dominant inheritance? Yes No If you chose "yes", answer questions (i) and (ii) and leave parts (iii) and (iv) blank. If you chose "no", leave parts (i) and (ii) blank and answer questions (iii) and (iv). i) If
asked by selly 
chemistry
What are the freezing point and boiling point of an aqueous solution of 15.5 g glucose(C6H12O6) dissolved in 150 g of water?
asked by Daniel 
Math
Kathy drove from Dry Creek to Cactus, a distance of 250km. She increased her speed by 10km/h for the 360km trip from Cactus to spur. If the total trip took 1 hours, what was her speed from Dry creek to Cactus.
asked by Andre 
Geometry
Lobster fishers in Maine often use spherical buoys to mark their lobster traps. Every year the buoys must be repainted. An average buoy has a 12 inch diameter, and an average fisher has about 500 buoys. A quart of marine paint covers 175 ft squared. How
asked by Shaniqua 
Volume/Calculus
Find the volume of the parallelepiped with the given vertices: A(0,0,0) B(4,0,0) C(4,2,3) D(0,2,3) E(4,5,3) F(0,5,3) G(0,3,6) H(4,3,6)
asked by Christal 
Precalculus
Find all solutions to 2 sin(theta) = sqrt(2) on the interval 0 less than or equal to theta less than 2 pi Give your answers as exact values, as a list separated by commas.
asked by anonymous 
Physics
A singleturn square loop of side L is centered on the axis of a long solenoid. In addition, the plane of the square loop is perpendicular to the axis of the solenoid. The solenoid has 1490 turns per meter and a diameter of 6.00 cm, and carries a current
asked by Valerie 
chemistry
Calculate Kp at 298 K and 490 K for the reaction NO(g) + 1/2 O2(g) = NO2(g) assuming that Delta H(g) is constant over the interval 298 K  600 K. Do you expect Kp to increase or decrease as the temperature is increased to 600 K?
asked by hayley 
Physics
Determine the electric potential energy for the array of three charges shown in the drawing, relative to its value when the charges are infinitely far away. (Let q1 = 8.48 µC, q2 = 19.2 µC, and q3 = 16.1 µC.)
asked by Emilie 
Chemistry
Complete and balance the molecular equation, including phases, for the reaction of aqueous copper(II) chloride, CuCl2, and aqueous potassium phosphate, K3PO4. Balance the net ionic equation, including phases, for this reaction.
asked by Unknown 
Chemistry
Glycerol is a nonvolatile water soluble material. It's density is 1.25g/ml. Predict the vapor pressure of a solution of 2.40E2 ml of glycerol, in 385ml of water, at the normal boiling pt of water.
asked by Jonah 
biology
(d) Is this pedigree consistent with sexlinked dominant inheritance? Yes No If you chose "yes", answer questions (i) and (ii) and leave parts (iii) and (iv) blank. If you chose "no", leave parts (i) and (ii) blank and answer questions (iii) and (iv). i)
asked by selly 
physics
A 63.8 N crate is pulled up a 5.22 m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 59 degree to the horizontal and there exists a constant frictional force of 32.6 N between the crate and the surface, what is the
asked by need help please 
Chemistry
Explain how water of hydration is related to measurement. Then explain how it is related to the law of definite composition
asked by Lydia 
Maths
There are 50 oranges in a box 3/10 of them are rotten. How many oranges are not rotten?
asked by Armando 
physics
A rollercoaster car loaded with passengers has a mass of 2,000 kilograms. The track of the roller coaster has a semicircular valley with a radius of 24 meters. If the vehicle has a speed of 18 m/sec at the very bottom of the valley, the force exerted on
asked by Anonymous 
chemistry
this is a really long question. i don't understand how to answer it. help please. A 10.0% aquueous solution of sulfuric acid has a density of 1.0661 g/mL at 20 degrees celsius. A. how many grams of H2SO4 are found in 50.0 g of this solution? B. how many
asked by Nicole 
physics
A 35,000 kg locomotive is moving at a velocity of 11 m/s east. What is the magnitude of the locomotive's momentum?
asked by alyssa 
chemsitry
Consider the diprotic acid H2A with K1 1*10^3 and K2= 1*10^9 . Find pH, [H2A], [HA], and [A2] for a .2000M solution of H2A b)Find pH, [H2A], [HA], and [A2] for a .200M solution of HA c) Find pH, [H2A], [HA], and [A2] for a .200M solution of A
asked by Jessica 
Physics
A car has a unibodytype frame and is supported by four suspension springs, each with a force constant of 36100 N/m. The combined mass of the car’s frame and everything inside it (the engine, the seats, the passengers, etc.) is 1270 kg. Because of
asked by Emily 
chemistry
What is the expected freezing point of a 3.50 m (m standing for molality)aqueous solution of BaCl2(Kfp= 1.86 degrees Celsius/m)? What is the expected boiling point(Kbp= 0.512 degrees Celsius/m)? which is effected to the greater extent, the boiling point or
asked by Patricia 
chemistry
an aqueous solution solution of sodium borate is sometimes used to to fireproof wood. a. what is the molarity of 2.50 L of solution that contains 1.85 moles of sodium borate? b. what is the molarity of 45.0 L of solution that contains 6.78 kg of sodium
asked by Jessica 
Chemistry
calculate the ph of titration of 50.0 ml of 0.140 m hclo (aq)
asked by Aaron 
physics
3. In the figure, a runaway truck with failed brakes is moving downgrade at 107 km/h just before the driver steers the truck up a frictionless emergency escape ramp with an inclination of θ = 14°. The truck's mass is 1.4 × 104 kg. (a) What minimum
asked by Samira 
Math
A cylinder shaped jar has a radius of 2 cm and a height of 6 cm. What is the volume of the jar?
asked by Robinaylor 
life orientation
Critically discuss five ways in which air pollution problem impacts in the community
asked by hlobi 
Biology HELP
How would the production of gelatinase help a pathogen be more virulent?
asked by Rebecca 
life orientation
Critically discuss five ways in which air pollution problem impacts in the community
asked by hlobi 
M361
A factory worker productivity is normally distributed. worker A produces an average of 84 units per day with a standard deviation of 24. worker B produces at an average rate of 74 units per day with stanard deviation of 25. (a) what is the probability that
asked by mercy 
life orientation
suggest 5 recommendations on how to address the environmental problems within south africa
asked by phindile 
Science
Phenylketonuria (PKU) is a human metabolic disease caused by the recessive allele k. If 2 heterozygous carriers of the allele marry and plan a family of five children: a) what is the chance that all their children will be unaffected? b) what is the chance
asked by Rox 
Chemistry
i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of a strong acid or a 0.1 M solution of a weak acid. b. a 0.1 M solution of an acid with Ka=2×103 or one with Ka=8×106 c. a 0.1 M solutions of
asked by m 
math
A basketball player made 65 out of 100 attempted free throws. What pecent of free throws was made?
asked by deirdre 
biology
Consider the pedigree below. This pedigree represents a family with a rare genetic disease. Note two very important assumptions: Individuals who marry into the family may carry a disease allele. The disease is completelely penetrant. That is, any
asked by selly 
Lifeorientation
Way in which you critically discuss how life style behaviour impact on the teenager
asked by Hlongwane sukani. 
Business Statistics
Suppose that in the past, 94% of all Hispanic grocery shoppers were women. Perhaps due to changing cultural values, we believe that more Hispanic men are now grocery shopping. We randomly sample 689 Hispanic grocery shoppers from around the United States
asked by Jason 
Maths
A 40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form a platform of dimensions 28m by 22m.find the hight of the platform.
asked by Anonymous 
Physics
A crane with a movable pulley system on a horizontal arm is moving a large container. The 355 kg container is hanging from a cable that is 6.15 m out on the 7.50 m arm. The arm has a mass of 345 kg. A cable that is attached to its end makes and angle 32.0
asked by Bella 
Maths
A 40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form a platform of dimensions 28m by 22m.find the hight of the platform.
asked by Anonymous 
Grandpa need Math help
Gettin to old to help a 13 yr old. I think I know the answer to the below but need to confirm it. Anyone that could assist this ol man would be much appreciated!!! How do the volume of prisms compare as the number of faces in the prisms increases? Does the
asked by Grandpa 
chmistrye
Using the data in this table of the thermodynamic quantities for selected substances and given the pressures listed, calculate ƒ¢G at 25‹C for each of the following reactions (a) N2(g) + 3 H2(g) ¨ 2 NH3(g) PN2 = 2.0 atm, PH2 = 5.4 atm, PNH3 = 2.2
asked by sarah 
Maths
A 40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form a platform of dimensions 28m by 22m.find the hight of the platform.
asked by Anonymous 
chemistry
find the molality of a saltwater solution containing 0.27 mol NaCl in 150 g water.
asked by Catherine 
Physics
A single conducting loop of wire has an area of 7.4 104 m2 and a resistance of 110 Ω. Perpendicular to the plane of the loop is a magnetic field of strength 0.18 T. At what rate (in T/s) must this field change if the induced current in the loop is to be
asked by Valerie 
finite
a basket ball player makes 65% of her free throws find the probability that she will make at least 7 of her next 8 free throws
asked by Anonymous 
Life orientation
What is community organization that are involved in supporting or giving redress to alcohol
asked by Itu 
math
A rectangular garden is 20 m by 25m. It is surrounded by a sidewalk. The outside perimeter of the sidewalk is 114m. What is the width of the sidewalk?
asked by john 
Chemistry
Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation CO2(g) CO2(aq) K=0.032 The acid dissociation constants listed in most standard reference texts for carbonic acid
asked by helllp 
stats
The president of a large university wishes to estimate the average age of the students presently enrolled. From past studies, the standard deviation ó is known to be 2 years. A sample of 50 students is selected and the mean is found to be 23.3 years. a.
asked by chris 
math
Find the vertex of the parabola. y = 2x2 + 12x  13
asked by tammy 
Maths
A 40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form a platform of dimensions 28m by 22m.find the hight of the platform.
asked by Anonymous 
physics
A train accelarates uniformly in a straight line at 0.3m/s^2 from rest. Calculate the velocity 15 seconds after its departure. Calculate time taken to reach 30km/h and calculate Distance covered by the train
asked by leslie 
Precalc with Trig
What value(s) of theta (0 less than or equal to theta less than or equal to 2pi) solve the following equation: cos squared theta  cos theta  6 = 0
asked by Natalie 
physics
The Earth has a radius of about 6.38 ´ 103 kilometers at the equator and rotates 360° every 24 hours. The angular displacement of a person standing at the equator for 8.0 hours is:
asked by carmen 
Precalculus
Find all solutions to 2 cos(theta) =  1 on the interval 0 less than or equal to theta less than 2 pi Give your answers as exact values, as a list separated by commas.
asked by Anonymous 
Chemistry
Products used to remove clogs in drains contain strong bases, such as sodium hydroxide (NaOH). If drain cleaner containing 10.0g NaOH's is added to a clogged drain pipe filled with 2.5L water how many moles of NaOH were added? It'd mean a lot if someone
asked by Allyson 
volumes of prisms
How do the volume of prisms compare as the number of faces in the prisms increases? Does the volume remain the same? Explain Please!
asked by Greg 
Physics
A mass of 0.22 kg is attached to a spring and is set into vibration with a period of 0.10 s. What is the spring constant of the spring? Answer in units of N/m
asked by Emily 
Precalculus
Solve cos(x) = 0.44 on 0 (less than or equal to) x (less than) 2pi There are two solutions, A and B, with A < B Give your answers accurate to 3 decimal places
asked by marie darling 
Chemistry
Sketch the titration curve for the tirtation of (0.10M) HCl vs 25.0mL (0.50M) NaOH
asked by Rob 
Chemistry
If there are 2L of H2 gas at .625 atm, and 1L of N2 gas at .200 atm isolated in two flasks, what are the final partial pressures of each, and the total pressure, after the valve between the two flasks has been opened and the gases are allowed to mix? Is
asked by Lily 
chemistry
What volume of 2.25\it M \rm HCl in liters is needed to react completely (with nothing left over) with 0.750L of 0.200\it M \rm Na_2CO_3?
asked by Lauren 
physics
A 2.10 m diameter university communications satellite dish receives TV signals that have a maximum electric field strength (for one channel) of 7.90 µV/m. (a) What is the intensity of this wave? W/m2? (b) What is the power received by the antenna? W? (c)
asked by taryn 
precalculus
Solve sin(x) = 0.64 on 0 less than or equal to x less than 2pi There are two solutions, A and B, with A < B Give your answers accurate to 3 decimal places
asked by anonymous 
physics
You push a 1.3 kg block against a horizontal spring, compressing the spring by 22 cm. Then you release the block, and the spring sends it sliding across a tabletop. It stops 79 cm from where you released it. The spring constant is 220 N/m. What is the
asked by Samira 
life orientation
Critically discuss five ways in which air pollution problem impacts in the community
asked by hlobi 
chemistry
Sodium fluoride and lead nitrate are both soluble in water. If 1.13 g of NaF and 0.232 g of Pb(NO3)2 are dissolved in sufficient water to make 1.00 L of solution, will a precipitate form? How do you know if there should be a precipitate or not? What is the
asked by jeff 
math
What does a lower perfect square and a upper perfect square mean.
asked by ashley 
Life orientantion
Teenage pregnancy ways in which human problem impacts on the community
asked by Dimakatso 
chemistry
what mass of K2SO4 would you measure out to prepare 350 mL of a .76 M solution? The gram formula mass of K2SO4 is 174.2 g/mol
asked by Catherine 
Science
The following heats of formation are used to find the change in enthalpy for the formation of tin chloride in the following reaction Sn (s) + 2Cl2(g) > SnCl4(l).Sn(s) + Cl2(g) > Sn Cl2(l) DH = 186.2 kJSnCl2(s) + Cl2(g) > SnCl4(l) DH = 325.1 kJWhat
asked by Mary 
geometry
The ratio of two similar prisms is 2:5 the volume of the larger is 375cm3 if sand is being poured into the smaller prism at 3cm3 per second how many seconds will it tAke to fill the smaller prism?
asked by Olivia 
Physics
A 4.1 kg bundle starts up a 31° incline with 148 J of kinetic energy. How far will it slide up the incline if the coefficient of kinetic friction between bundle and incline is 0.39?
asked by Ariana 
Chemistry
I'm having trouble balancing this equation: SO3^2 > S2O4^2 It's in a basic solution. Thanks.
asked by C 
Precalculus
Solve sin(x) = 0.36 on 0 le x lt 2pi There are two solutions, A and B, with A < B and A and B in radians to 4 decimal places.
asked by marie darling 
Chemistry
The indicator bromocresol green (HIn) can be in two different forms: As HIn the color of the indicator is yellow, an In the color of the indicator is blue, and an equilmolar mixture of the two species is green. The Ka of the indicator is 2.5 x 105. What
asked by Marcus 
science
dr. halite combined sodium metal with chlorine gas to make sodium chlorine (table salt). The chemical reaction used up all of the metal and sll of the gas. If dr halite made 116 g of table salt and started with 68 g of chlorine gas, then how many grams of
asked by artie 
Analytical chemistry
a .2280g sample contained only NaCl and KBr. it was dissolved in water and titrated with a 0.04799M of AgNO3. complete titration of both halides was found to require 51.27mL of the AgNO3 solution. Calculate the weight percent of Cl in the solid sample.
asked by Lana 
Precalculus with Trig
Rewrite the following expression as an algebraic expression in x: cos(arcsin(x))
asked by Natalie 
chemistry
Sodium bicarbonate is often used to neutralize acids, such as the following reaction: NaHCO3 + HCl > NaCl + H20 + CO2. What is the normality of a sodium bicarbonate solution containing 5.08 g NaHCO3 in 150.0 mL solution? this chapter in chemistry is
asked by Patricia 
chemistry
When 1988 J of heat energy is added to 47.5 g of hexane, C6H14, the temperature increases by 18.5 °C. Calculate the molar heat capacity of C6H14.
asked by zach 
math
How far does the tip of the minute hand of a clock move in 100 minutes if the hand is 3.3 inches long?
asked by valerie 
chemistry
Suppose that 2.25 grams of CuSO4 are dissolved in 930 mLs of 0.30 M ammonia. What concentration (Molarity) of Cu2+ ion is expected to be free in the aqueous solution and not bound to ammonia in the complex ion Cu(NH3)42+? The Kf for Cu(NH3)42+ is 5.0 x
asked by Anonymous 
trig
i nead to find to the nearest degree all values of theta in the interval 0 x 360 that satisfy the equation 3 cos 2 theta+ sin theta1=0
asked by Anonymous 
Calc
Im not getting these answers at all, please help. Find a formula for the fourth degree polynomial p(x) whose graph is symmetric about the yaxis (meaning it has no odd powers of x), and which has a yintercept of 0, and global maxima at (4,512) and
asked by Anonymous 
math
Convert the angle given in radians to degrees. 174 and 360
asked by valerie 
math
The Question is: The value of a new car depreciates at a rate of 12% per year. 1)Write an equation to represent the approximate value of a car purchased for $23 000. 2)Determine the value of the car two years after it is purchased. 3)Approximately how many
asked by Daniel 
Physics
Two parallel plates are separated by a dielectric of thickness 2 mm with a dielectric constant of 6. If the area of each plate is 40 cm^2 and the potential difference between them is 1.5 kV, determine (a) the capacitance
asked by Miguel 
English
I need help on how to critique the poem "No more Boomerang" by Kath Walker
asked by Marishea 
LBCC
A multiple choice quiz consists of 20 questions, each with 3 possible equally likely answers. If a student guesses at the answer to each question, then the mean number of correct answers selected by the student is?
asked by Lynn 
history
Why did the US intervene in Vietnam, during the Vietnam War, and support Diem's regime for econommic reasons? Not only for America's own good but for what else?
asked by sarah 
math
solve the problem A drug is injected into a patient and the concentration of the drug is monitored. The drug's concentration, C(t), in milligrams after t hours is modeled by C(t) = (7t)/2t^2+4.
asked by sara 
PreAlgebra
Find 3 consecutive positive integers such that the product of the first and third, minus the second, is 1 more than 5 times the third.
asked by Nancy 
LBCC
The number of movies shown in different theatres on Saturday morning in a small city is given in the following. x P(x) 1 0.15 2 0.20 3 0.30 4 0.10 What is the mean distribution (or expectation) of the data given above?
asked by Lynn 
Vectors/Calculus
The question asks me to find the area of the triangle with the given vertices. (The area A of the triangle having u and v as adjacent sides is given by A=1/2 u x v.) the vertices are: (0,0,0) (1,2,3) (3,0,0)
asked by Krista 
5th grade math (word problems)
Stefan pours 5/8 cup of milk. He uses 2/3 of it for a bowl of cereal. What fraction of a cup of milk does he use with his cereal? solution: 5/8 * 2/3 = 10/24 = 5/6. So, is the answer 5/6?
asked by Alex 
math
A plane leaves hamilton and flies due east 75 km at the same time a second plane flies in a direction of 40degress southeast for 120 km how far apart are the planes when they reach their destination. I say the calculation is 75^2+120^22(75)(120)cos40 the
asked by Rose 
11th grade math
in triangle DEF,
asked by Alex 
literature
There are many similes and metaphors that allude to death and dying in the story (death in the shawl). Identify as many as you can and discuss their effect on the story.
asked by esther 
stats.
One hundred subjects in a psychological study had a mean of 35 on a test instrument designed to measure anger. The study the ó=10. Find a 99% confidence interval for the mean anger score of the population.
asked by chris 
life orientation
Critically discuss five ways in which air pollution problem impacts in the community
asked by hlobi 
Physics
A magnetic field increases from 0 to 0.09 T in 3.0 s. How many turns of wire are needed in a circular coil 20 cm in diameter to produce an induced emf of 7.5 V? Please help soon.
asked by Valerie 
science
energy produced from atomic reactions is called ________
asked by hannia 
Statistics
IQ score are normally distributed with a mean of 95 and a standard deviation of 17. If the sample size is n=36 find the mean and standard distribution of sample mean
asked by Megan 
chemistry help
1. Calculate the energy change (q) of the surroundings (water) using the enthalpy equation qwater = m × c × ΔT. We can assume that the specific heat capacity of water is 4.18 J / (g × °C) and the density of water is 1.00 g/mL. Show ALL your work. The
asked by MadiB PLEASE HELP :( 
statistics
if your HIM department has 100,000 active medical records and you received 5,352 requests for records within a six month period, what is the request rate for the past six months
asked by Anonymous 
Math
The inner diameter of a piston is normally distributed with mean of 10 cm and standard deviation 0.03cm a)below what value of inner diameter will fall fifteen percent of the piston rings?
asked by Kira 
math
Solve negative fiveninths equals negative two v minus onethird for v. choices fourninths negative oneeighteenth oneninth fivesixths
asked by sammy 
Physics
1. You have a large wind tunnel of crosssectional area 0.61[m2]. The wind speed is 4[ms1]. Assume air density is 1 [kgm3]. The Drag is 2.3[N]. What is the coeffecient of drag for the shape that has diameter 7.32[cm]? . Use three sig. figs. or N/A if
asked by Sean 
Chemistry
When the concentration of a weak acid in solution is equal to the concentration of its conjugate base in solution, then: Would pH=pKa or would it equal pH=pKa + 1 like HendersonHasselbalch equation?
asked by Marcus 
Chemistry
A 72.2 g ice cube floats in the Arctic Sea. The temperature and pressure of the system and surroundings are at 1 atm and 0°C. Calculate ΔSsys, ΔSsurr, and ΔSuniv for the melting of the ice cube. (The molar heat of fusion of water is 6.01 kJ/mol.)
asked by Bree 
life orientation
Identify and describe 3 environmental health hazards that ill health,crises,and or disasters
asked by celeste 
Math
John has 4 math books, 6 biology books,, and 8 statistics books to arrange on a shelf. In how many ways can he arrange the books so that books on the same subject are grouped together?
asked by Reet 
Anthropologhy
Sumptuary laws are: (Points : 1) property laws. marriage laws. religious laws. civil laws.
asked by Tawnya 
Chem
Ores are analyzed by dissolving some of the ore and then performing an analysis of a metal (expressed in grams); usually the concentration of the metal is expressed as % of the amount of the ore (in grams) dissolved. An ore containing V was dissolved and
asked by Mariam 
chemistry
Thimerosal is an organic compound (gram molecular mass = 404.8 g/mol) used to inhibit bacterial growth. A .100%solution of thimerosal is sometimes used as an antiseptic. Assume that this solution has a density of 1.00 g/mL. A. how many grams of thimerosal
asked by Tyler 
AP Stats (math)
A large metropolitan area found that the time it takes for people to commute to work has a mean of 20.5 minutes and a standard deviation of 15.4 minutes. What is the probability that a random sample of 40 people have a mean commute time greater than 25
asked by Kyle 
Chemistry
i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of an acid with Ka=2×103 or one with Ka=8×106 b. a 0.1 M solutions of a base with pKb=4.5 or one with pKb=6.5
asked by Anonymous 
world history
4 famous poet during Spain golden age ?
asked by Ali 
physics
A boat is traveling on a bearing of 25 degrees East of North at a speed of 4 knots (a knot is 1.852 km/h). After traveling for 3 hours, the boats heading is changed to due South and it travels for an additional 2 hours at 5 knots. Using a Vector diagram,
asked by Chad 
chemistry
for a .001M solution of methionine: a) calculate the isoelectric pH b) calculate the isoionic pH
asked by Lana 
Precalculus with Trigonometry
Prove or disprove the following identity: cos (x+pi/6) +sin (xpi/3) = 0
asked by Natalie 
Math
Expand (3f+2h)^4
asked by Diamond 
math
Jeanna wants to buy a new boat for her family. She has two payment options. The first option is to pay a cash payment of $7,200. The second option is to finance the boat with a threeyear instalment loan. The loan requires a 10% down payment and 36 equal
asked by Vickie 
Physics
What is the coeffecient of drag for the shape that has diameter 7.32[cm]? . Use three sig. figs. or N/A if there is not enough information. 2. You have a large wind tunnel of crosssectional area 0.95[m2]. You have a set of shapes that are all the same
asked by Sean 
Write the expression as a single log
Write the expression as a single log. Express powers as factors ln(x/x5) + ln(x+5/x)  ln(x^225)
asked by Alley 
Algebra
Use properties of logarithms to find the exact value of each expression. Do not use a calculator. 8^log 8^5
asked by Kendall 
chemistry
calculate the pH at 25 celcius degree of 0.080 mol/dm3 HNO3
asked by unathi 
science
A train accelerates uniformly in a straight line at 0.3m/s from from rest. Calculate the velocity 15 seconds after its depature. Calculate the time taken to reach 30km/h and the distance covered by the train.
asked by leslie 
biology
(c) Is this pedigree consistent with sexlinked recessive inheritance? Yes No If you chose "yes", answer questions (i) and (ii) and leave parts (iii) and (iv) blank. If you chose "no", leave parts (i) and (ii) blank and answer questions (iii) and (iv). i)
asked by selly 
11th grade math
find the length of arc if an angle measuring 25 degrees is in the circle of radius 6 feet
asked by Alex 
math
An antique dresser was purchased for $7500 in 2005. The dresser increases in value by 9% per year. Find the value of the dresser in 2025. So i thought it would be : A = 7500(1+0.09)^(20) A = 42033... However I have been told it could be: Value = 7500 +
asked by Daniel 
Math
a curve is such that dy/dx=4x+7. the line y=2x meets the curve at point 'P'. Given that the gradient of the curve at P is 5. State the coordinates of P.
asked by Ashley 
math
Wondering the answers to these: Find the value of each of the following. Leave your answers as fractions where appropriate. [I did these myself but need to answercheck] a) log[base4](1/8) b) 10^(10log3) c) 2log[base3](9) d) log[base3](3)^(2x) ans: a)
asked by Daniel 
math
an airplane climbs at a rate of 66.8 feet per minute. It descends at twice the rate that it climbs. Assuming it descends at a constant rate, how many feet will the aitplane descend in 30 minutes.
asked by tracey 
physics
A L=3 mile long conducting cable tethers a satellite to the International Space Station. The Cable moves through the Earth' magnetic field of about B=0.02 Gauss at a speed of v=8 km/sec. The cable points radially from the Space Station to the satellite.
asked by abdul rahman 
Problem Solving! please I need more help!!
How long will take for a $3000 savings account to double its value at simple interest rate of 10%?
asked by Jeconiah 
Chemistry
When looking at a titration curve, I have to determine which is not true and I have it narrowed down to two options: The initial starting point on the titration curve is where pH depends only on [HA]0 or The finial point on a titration curve the pH depends
asked by Marcus 
Statistics
If the average IQ is 100 with a standard deviation of 10, what percentage of the population has an IQ of at least 116?
asked by Josh 
College Chemistry
The Water loss by the sample, and the percent by weight of water in the unknown hydrates is 34.78%H2O. which of the ten possible hydrates are the most likely ones to be your unknown based on the percent by weight?
asked by judy 
English
1. He is doing voices of the former President Kim Youngsam at the school talent show. 2. He is imitating the voices of the former President Kim Youngsam at the school talent show. 3. He is mimicking the voices of the former President Kim Youngsam at the
asked by rfvv 
Life orientation
Poverty leads 2 ppl bng undernourised,n dey lck access 2 clean air n basic services.n als ppl hvng fewer choices abt whr dey liv,as dey may b frced 2 liv in polluted environment
asked by Sally madiba(hans kekana secondary school 
Physics
1a)if accelerating voltage is doubled in a CRT the deflection will change from "d" to ____? b) if magnetic field strength is doubled, deflection in a CRT will change from "d" to ___?
asked by Anna 
General Chemistry
What volume of 1.0 M HCl would react completely with 0.20 grams of NaC2H3O2*3H2O? It sounds like an equation I would set up as this and would use mole ratios to calculate the answer: HCl + NaC2H3O2*3H2O > But I am confused as to what I would put as the
asked by Emily 
calculus
*The sum of 6 times the length of a shed. It width is 60ft. What are dimensions that gives maximum area for floor of the shed?
asked by thomas 
math
convert y=x^2+9x+14 to factored form
asked by Gabriella 
Math
Is 2Cos x the same thing as Cos^2 x? Thanks
asked by Shadow 
Math
Joe has $10,000 to purchase a used car. If the sales tax is 7% and the fee for title and license plates is $200, what is the maximum amount Joe can spend for a car? $9,158.88
asked by Tammy 
Chemistry
Calculate the mass in grams of glycerol you would need to make 200 g of a 20% (w/w) glycerol solution.
asked by Anonymous 
maths
if the temperature is 14F at 4pm and is lowered every 2hrs what is the temp. at midnight
asked by Anonymous 
Science
A newspaper story on AIDS reports that an allele (R) confers complete resistance to HIV when homozygous and that 1% of the human population is resistant (RR). The story also states that 20% of the population carries one copy of the resistance allele (i.e.,
asked by MT 
physical science
A builder pushes a wheelbarrow loaded with sand ,from rest at point A,up a ramp of unknown length ,which is inclined at unknown angle ,vertical height of unknown 2,75m
asked by lucky 
physics
On its highest power setting, a microwave oven increases the temperature of 0.350 kg of spaghetti by 45.0°C in 100 s. (a) What was the rate of power absorption by the spaghetti, given its specific heat is 0.900 kcal/kg·°C? W (b) Find the average
asked by taryn 
chemistry
How many grams of H2SO4 are contained in 4.5 L of .30N (N standing for normality) sulfuric acid? Help would be much appreciated.
asked by Daniel 
math
A rocket takes off vertically at time t=0, and during the first 10 s of flight its acceleration in m/s^2 is given by a(t)=10tt^2 find the height reached by the rocket after 10s.
asked by bell 
physics
mc0301.jpg Two stars are bound together by gravity. The larger star has four times the mass of the smaller star. Which diagram best illustrates the orbital motion of the two stars? (Note: the stars are shown much larger than they really are compared to
asked by carmen 
Mathematics
If cosA is equal to 12/13 where 0 degrees is less than A less than 90 degrees, then tanA is equal to 3/4 where 0 degrees is less than A less than 90 degrees. Determine the ff: Sin2A
asked by Lungelo masuku 
LBCC
At a certain college, there were 780 science majors, 320 engineering majors, and 390 business majors. If one student was selected at random, the probability that they are a business major is?
asked by Lynn 
LBCC
An apartment building has the following apartments: 2 bdrm 3 bdrm 4 bdrm 1st floor 7 3 4 2nd floor 9 0 11 3rd floor 8 4 7 If an apartment is selected at random, what is the probability that it is a 2 bedroom apartment on the 3rd floor?
asked by Lynn 
Chemistry
The water loss by the sample, and the precent by weight of the water in the unknown hydrates 34.78%H2O. which of the ten possible hydrates are the most likely ones to be your unknown based on the percent by weight?
asked by judy 
math
a hallway is 85 by 8 feet and have tile 1 by 1 feet how many tiles will i need to finish the hallway
asked by Anonymous 
Science
A Family travels 200 km in two hours and 20 min .then they stop to eat lunch.After lunch they travel 300 km In Two 3 Hours and 40min.What is the average speed during the entire trip?
asked by Edward 
PreCalculus follow up question Reiny
Determine the number of triangles that can be formed with the given information. and if it forms two possible triangles solve all unknown angles and sides Angle A=116 degrees a=10 b=11 but if you add 81.4 (measure of angle B) plus 116 (measure of angle A)
asked by DW 
Math
in triangle DEF,
asked by Alex 
Geometry
A sphere has a great circle circumference of 40pi feet. What's its volume?
asked by Shaniqua 
Math
1. A certain airline has 10 flights a day from N.Y. to Chicago. From chicago there are 8 flights a day to L.A. Can you conclude that there are 80 possible ways to book a flight from N.Y. to L.A. via chicago? Explain
asked by Anonymous 
Precalculus with Trigonometry
Graph f(x) = sin(3x)/sin(x)  cos(3x)/cos(x) and make a conjecture. Prove your conjecture.
asked by Natalie 
chemistry
How can I identify the ions present in (NH4)2SO4.FeSO4.6H2O qualitatively?
asked by Ken 
English
1. This is the desk. That belongs to Bill. = This is the desk that belongs to Bill. 2. This is the window. Bill broke it yesterday. = This is the window that Bill broke yesterday. 3. This is the book. Its cover is red. = This is the book whose cover is
asked by rfvv 
math
a metal bar weighs 9 grams .93% of of the bar is silver.how many grams of silver is in the bar?
asked by himani 
life orientation
Critically discuss 10 ways which the environmental health hazards can impact negatively on ones health
asked by dunia 
math
The function g(x)= x/453.6 converts x grams to pounds, as shown. Which composite function expresses the number of pounds that can be lifted by a balloon containing x ft3 of air?
asked by Anonymous 
Math
Which expression would provide the most reasonable estimate for the product of the expression 4/7 x 3 7/8
asked by Kelly Coreas 
Chenistry
which of the ten possible hydrates are the most likely ones to be your unknown based on the percent by weight?
asked by judy 
MATH
Logv3(12) = logv3 (3t^2)  logv3 (3t) (the v means "log 3" 3 is the base)
asked by CASEY 
LBCC
Find the mean of the distribution shown. x 2 5 7 P(x) 0.28 0.42 0.30 What is the mean and the standard deviation of this distribution?
asked by Lynn 
history
What was the MAIN focus of African American activists in 1964?
asked by Nina 
chemistry
A 337\rm mL sample of unknown \rm HCl solution reacts completely with \rm Na_2CO_3 to form 17.1g \rm CO_2. What was the concentration of the \rm HCl solution?
asked by Lauren 
physics
A current I=2 Amperes flows in a circular single loop coil of radius R=10 cm. (a) Evaluate the magnitude of the magnetic field (in Tesla) at a point P on the axis of the coil, and a distance z =5 cm away from the plane of the coil itself. Now consider two
asked by abdul rahman 
Trig
Solve the trig equation exactly over the indicated interval. tanθ = 0, all real numbers I know the answer is πn, but I don't understand how they got this. I get that tanθ = 0 on π and 2π on the unit circle, so did they just put n on the end of π
asked by Anne 
Math
Simplify. (82  60) + [(3 x 4)  36÷4] 25 19 10 1
asked by Tammy 
psychology
Mensa is a group for those who score within the top 2% on a standardized intelligence test. The group "provides a forum for intellectual exchange among its members.What do you think about a group of people who get together based on their intelligence?
asked by slomomo 
LBCC
A coin is tossed 4 times. Find the probability that the 4th toss is a tail, given that the first 3 tosses were all heads.
asked by Lynn 
Math Probability HELP
Tom Cruise is reported to be 5'7.8" tall. Male heights are normally distributed with a mean of 70 inches and a standard deviation of 2.8 inches. Find the probability that; 1) A randomly selected male is Tom Cruise's height or smaller. 2) Three randomly
asked by Rebecca 
math
Simplify the expression if possible. log(100^4z)
asked by Katie 
L.O
in 15 lines critically discuss 5 ways in which the human or environmental problem impacts on the community.provide relevant sources to support your claims.
asked by nokuphila 
Algebra
The length of a rectangular flag is four yards longer than the width. The area f the flag is 140 square yards. Find the length and the width.
asked by Danielle 
math
Confused! So here is the question: Inflation is currently causing the cost of items to increase by about 2.5% per year. In 2009 a litre of gasoline costs approximately $0.90. What will it cost to fill a 60 litre gas tank 10 years from now. Round your
asked by Daniel 
Economics
An investor desires to make an investment in bonds provided he realize 10% on his investment. How much can he afford to pay for a $10000 bond that pays 7% interest annually and will mature 20 years hence?
asked by Meme 
math
If tan^2(t)  sin^2(t) = sin^a(t)\cos^b(t), then the positive power a = the positive power b =
asked by tyler 
math
One more question: Beginning with the function f(x) = (0.8)^(x), state what transformations were used on this to obtain the functions given below. a) g(x) =  (0.8)^(x)  2 b) h(x) = (1/2) (0.8)^(x2) c) k(x) = (0.8)^(3x+9) These are the answers I have,
asked by Daniel 
PreCalculus
Determine the number of triangles that can be formed with the given information. a=1, b=5, c=4
asked by DW 
Physics
Platform area = 0.027[m2]. Wind Speed = 7.1[ms1]. Air Density = 1[kg m3]. Drag = 0.39[N]. Lift = 1.45[N]. Coeffecient of Lift = Use three sig. figs. or N/A if no answer. Platform area = 0.045[m2]. Wind Speed = 5.7[ms1]. Air Density = 1[kg m3]. Drag =
asked by John 
physics
Compared to the number of radians in one revolution of a bicycle tire with a radius of 33 centimeters, the number of radians in one revolution of a gocart wheel (radius = 22 centimeters) is:
asked by carmen 
math
There are 36 cookies Jerry wants 25% of it and Gary want 1/2 and Terry want 0.75 can each friend get want they want?
asked by Anonymous 
c+=
true life magazine wants an analysis of the demographic characteristics of readers in c++ the marketing department has collectedreader survey records containing the age , gender , marital status ,and annual income of readers the data is stored in an input
asked by Anonymous 
Math
Solve for y (3/4)(8x+4x)+5y+4=(2/3)(12X+9)
asked by Louise 
7th grade math
Q:The ratio of the perimeters of two square is 5 to 4. If the area of the smaller square is 36 units, what is the area of the larger square? A: 56.25 My teacher told us the answer, 56.25, so that we could correct it. But I don't understand how she got the
asked by dingbat 
English III Love of Life By: Jack London
Love of Life by Jack London I'm really having problems, how to start the body of my essay in this story. Can you give me some hint, how to make the 1st step? thank you :)
asked by Isis 
exponential equation
Solve the exponential equation e^x + e^x = 6
asked by Tiffany 
math
he coned shaped room has a height of 15 feet and a radus of 72feet. What is the volume of the room?
asked by Robin Taylor 
PreCalculus
Determine the number of triangles that can be formed with the given information. and if it forms two possible triangles solve all unknown angles and sides Angle A=116 degrees a=10 b=11
asked by DW 
life orientation
In which five ways will the air pollution problem impacts on the community
asked by hlobi 
physics
If the sound waves detected by the dector is the same as the frequency of the source, what can we conclude about the motion of the source and detector?
asked by daryl 
physics
Come up with 10 things (like bowling) that could use physics? What does this mean?
asked by Shaniqua 
calculus
Please help!! *f(x)= x(x+6)^1/2 find two x intercepts. Then show that f'(x)=0 at some point between the 2 x intercepts. *Use mean value theorem for f(x)= x(x^23x+1) for interval [1,4] I FOUND DERIAVITIVE WHICH IS 3X^26X+1.THEN? *find all critical numbers
asked by thomas 
science
Cal the index of refraction for a medium in which the speed of light is 2.012*10^8 meter per seconds
asked by Damilola 
Algebra
Given f(x)=4+lnx; Find the inverse of f. f^1=?
asked by Ashley 
adv functions
Hi! I need help with determining the value of each of the following logarithmic expressions. Do not change the bases thx a) log[base8]4 b)log[base(1/3)]27
asked by Julia 
Psychology
In the theories of development, Who is the founder of the cultural theory?
asked by Anonymous 
in what order comes
This is highly advanced qquestion. You have a basket draw, and you have 14 balls left form 39 balls and 5 number will comes out next, would you be able to calculate which balls comes after sixth. It could be in any combo: for example: first draw 1 2 3 4 5
asked by behzad yousefzadeh 
physical science
two cars 200meters apart drive towards one another. If one car travels at 12 meters/s and the other at 26 meters/s how long does it take for them to collide?
asked by colin 
Agriculture
What records should be kept for efficient management of a dairy herd?
asked by Divine 
LBCC
According to an Internet posting, 65% of adults enjoy drinking soda. Choose a group of 12 adults at random. The probability that none of them enjoy drinking soda is?
asked by Lynn 
science asap
Air pressure decreases as altitude increases ^ which one goes on the horizontal axis and which one goes vertical axis? how did you choose this scale? (This is for a line graph)
asked by Anon 
biochemical genetics
You have discovered a new species of yeast and you would like to determine the pathway that this organism uses to synthesize the amino acid tryptophan. This yeast species can take up tryptophan, or synthesize it on its own if tryptophan is not present in
asked by selly 
biochemical genetics
After several rounds of experiments like those described above, you find that you have identified five different genes involved in the biosynthesis of tryptophan in this organism. You name them Gene 1 through Gene 5. Based on your knowledge of the pathway
asked by selly 
permutation
What would be the next 5 numbers after these: 6630345787 & 4679323682
asked by labe 
Math
a curve is such that dy/dx=4x+7. the line y=2x meets the curve at point 'P'. Given that the gradient of the curve at P is 5. State the coordinates of P.
asked by Ashley 
chemistry
50 ml of a .1103M solution of formic acid is titrated with a .2511M NaOH. a) What is the pH before and NaOH is added? b) How many mL of NaOH solution must be added to reach the equivalence pt? c) what is the pH at the equivalence pt of the titration? d) If
asked by Jessica 
Chemistry
I'm not really sure how to go about doing this problem... What is the pH of a 7.40 x 103 M solution of NH4Cl? Help is appreciated! Thank you
asked by Maddie 
Electrochemistry
Between Mg and Zn which one is the anode and which one is the cathode? And between Mg and Fe which one is the anode and which one is the cathode? Please and thank you. im so stuck. :/
asked by Shyanne 
math
Simplify and write the trigonometric expression in terms of sine and cosine: sin x +(cot x)(cos x) = 1/f(x) f(x)= ?
asked by tyler 
math
a cube is 5x5x5. How many smaller cubes in the larger cube. So I just mult. to get 125?
asked by jeanna 
PreCalculus
Determine the number of triangles that can be formed with the given information. a=1, b=5, c=4
asked by DW 
maths
The percentage of sugar in a solution of sugar and water is 9%. If 4 litres of this solution is diluted by adding 500mL of water, what is the percentage of sugar in the new solution?
asked by Rebecca 
Physics (fluids)
1. You have a large wind tunnel of crosssectional area 0.61[m2]. The wind speed is 4[ms1]. Assume air density is 1 [kgm3]. The Drag is 2.3[N]. What is the coeffecient of drag for the shape that has diameter 7.32[cm]? . Use three sig. figs. or N/A if
asked by Robert 
English
I want to learn how to write an appropriate letter to the editor in no more than 200 words. I took the article "stuck in the middle" by Jeevan Vasagar of "The Guardian" as an exercise, you can find it on Google. Unfortunately, I am not allowed to post
asked by John 
Math
Identify the solutions of the systems of equation, if any... X=1 Y=1
asked by Anonymous 
math
I have a snow globe with a radius of 2 cm. What is the volme of the globe?
asked by Robin Taylor 
um math
what does a circle graph show that a bar graph does not?
asked by Anon 
Child day care
An encyclopedia on cdRom would be most appropriate for a typical
asked by Anonymous 
ap calculus
find the coordinates for all points of inflection . find all intervals on which function has upward or downward concavity? i found to be 2/5
asked by david 
PreCalculus
Determine the number of triangles that can be formed with the given information. a=1, b=5, c=4
asked by DW 
PreCalculus
Determine the number of triangles that can be formed with the given information. a=1, b=5, c=4
asked by DW 
math
simplify 2xcubed+3x+5 divided by x+1. i am finding 2x squared3x5 and the book says 2xsquared2x+5.please help am stuck
asked by Bliss 
Math
So I have a question regarding advanced functions, logarithm stuff. here is the question: Beginning with the function f(x) = log[base(a)]x ,state what transformations were used on this to obtain the functions given below: a) p(x) = (5/8) log [base(a)]x b)
asked by Matthew 
L.o
How to address hiv/aids
asked by Anonymous 
Math
How do you convert 7 to the square root of 2 into a decimal? Also, how do you convert 3 to the square root of 8 into a decimal? Thanks
asked by Danny 
English
Pansori is a kind of Korean folk play. 1. Bill is doing pansory at the school talent show. 2. Bill is presenting pansory at the school talent show. 3. Bill is acting out pansory at the school talent show. (Q1: Which one is correct in the sentences above?
asked by rfvv 
Life orientation
Critically discuss 5 ways in which floods problem impact on the community provide relevant source to support your claims
asked by Thando 
grammar
Where is the misplaced or dangling modifiers? 1.Climbing a mountian, fitness becomw all important.
asked by shanna 
math
5x+2y=2 4x2y=8
asked by Anonymous 
chem
what is the Ka equation for HCHO2 i thought it was K_{a} = [CHO_2][H^+]/[HCHO_2] but its not correct
asked by sarah 
math
For the curve y = log(x+3) determine the following: a) asymptotes, if any. b) intercepts, if any. c) domain and range
asked by Adam 
Chemistry
What is the [H+] of the 0.25 M HCl solution? I'm not given a Ka value, so I'm assuming I won't need one to solve this particular problem?
asked by Marcus 
english
I'm writing a thesis for pathogens for infectious diseases. My essay is going to be about depressive disorder and anxiety disorder and I need to write a thesis for it.
asked by Tina 
LBCC
an apartment building has the following apartments: 2 bdrm 3 bdrm 4 bdrm 1st floor
asked by Lynn 
permutation
What would be the next 5 numbers after these: 6630345787 & 4679323682
asked by labe 
social studies
john cabot laid claim to the newfoundland region of canada for______ in 1497.
asked by michelle 
Science
what should you consider when you plan a title for a graph?
asked by Anon