Questions Asked on
October 28, 2012

chemistry
calculate the change in pH when 9.00ml of 0.100M HCl(aq) is added to 100.0mL of a buffer solution that is 0.100M in NH3(aq) and 0.100M NH4Cl(aq). ...Calculate the change in pH when 9.00,L if 0.100M NaOH(aq) is added to the original buffer solution.
asked by mike 
Chemistry
Metals lose electrons under certain conditions to attain a noblegas electron configuration. How many electrons must be lost by the element Ca? Is it 2 e^? Which noblegas electron configuration is attained in this process? argon radon krypton xenon
asked by Bill 
Chemistry
Determine the maximum number of electrons that can have each of the following designations. 2f,1Py,2Pz,5dyz,6f
asked by Farha 
Chemistry
Container A holds 752 mL of ideal gas at 2.40 atm. Container B holds 179 mL of ideal gas at 4.80 atm. If the gases are allowed to mix together, what is the resulting pressure? Note: Find the partial pressure of each gas in the total volume using a formula
asked by Garcia 
Chemistry
The organic compound dinbutyl phthalate, C16H22O4(l), is sometimes used as a lowdensity (1.046 g·mL–1) manometer fluid. Compute the pressure (in torr) of a gas that supports a 555mm column of dinbutyl phthalate. The density of mercury is 13.53
asked by Garcia 
Algebra
during a sale at the local department store, you buy three sweatshirts and two pairs of sweatpants for $85.50. later you return to the same store and but three more sweatshirts and four more pairs of sweatpants for $123. what is the sale price of each
asked by Katelyn 
chemistry
You extract the iron from a tablet and dilute that to 350.0 ml in a volumetric flask. You transfer 0.500 ml of this solution to a 75.0 ml volumetric flask and dilute this to volume. When you measure the concentration of this solution, you find that it is
asked by Kelcie 
Chemistry
What quantum numbers specify these subshells? 2s n= l= 3p n= t= 6d n= l=
asked by Bill 
AP chemistry
Liquid butane, C4H10, is stored in cylinders, to be used as a fuel. The normal boiling point of butane is listed as 0.5 C. (a) suppose the tank is standing in the sun and reaches a temperature of 35 C. Would you expect the pressure in the tank to be
asked by Harry 
help me plss
1. 48 c = __ qt (1 point) 6 8 10 12 2. 96 oz __ 5 lb (1 point) < > = 3. 6 yd, 1 ft = __ ft (1 point) 7 12 19 36 4. lb = __ oz (1 point) 104 108 112 136
asked by peter 
chemistry
How many kilojoules of heat are released when 38.6g of CH4 reacts completely with O2 to form CH3OH at constant pressure?
asked by Jamie 
physics
The drawing shows an intravenous feeding. With the distance of 0.610 m, nutrient solution (ρ = 1010 kg/m3) can just barely enter the blood in the vein. What is the gauge pressure of the venous blood? Express your answer in millimeters of mercury.
asked by Cat 
Chemistry
Balance the following halfreactions: (a) (acidic) VO2+ (aq) V3+ (aq) (b) (basic Ni(OH)2 (s)Ni2O3 (s) (c) (acidic) NO3 (aq)NO2 (aq) (d) (basic) Br2 (aq)BrO3 (aq)
asked by lynn 
precalculus
If a projectile is fired with velocity v0 at an angle θ, then its range, the horizontal distance it travels (in feet), is modeled by the function R(θ) = v02 sin 2θ 32 . If v0 = 2600 ft/s, what angle (in degrees) should be chosen for the projectile to
asked by Ama 
Chemistry
Balance the following halfreactions: (a) (acidic) VO2+ (aq) V3+ (aq) (b) (basic Ni(OH)2 (s)Ni2O3 (s) (c) (acidic) NO3 (aq)NO2 (aq) (d) (basic) Br2 (aq)BrO3 (aq)
asked by lynn 
physics
A child in danger of drowning in a river is being carried downstream by a current that has a speed of 2.10 km/h. The child is 0.600 km from shore and 0.800 km upstream of a boat landing when a rescue boat sets out. (a) If the boat proceeds at its maximum
asked by anusha 
Physics
The blades of a ceiling fan have a radius of 0.348 m and are rotating about a fixed axis with an angular velocity of +1.63 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 2.16 rad/s^2. After
asked by Sam 
Math
a firecracker is fired from the ground. The height of the firecracker at a given time is modeled by the function h(t) =5t^2+50t, where h(t) is the height in metres and t is the time in seconds. When will the firecracker reach a height of 45m ?
asked by Rutba 
Math (Area of Shapes)
Suppose that when pizza dough is rolled out it costs 25 cents per square foot, and that sauce and cheese when spread out on a pizza have a combined cost of 60 cents per square foot. Let's say sauce and cheese are always spread out to within 1 inch of the
asked by Chelsea 
Chemistry  Final Temperature
An unknown mass of each of the following substances, initially at 23.0C, absorbs 1910 J of heat. The final temperature is recorded as indicated. Find the mass of each substance. sand (Tf=62.0C) ethanol (Tf=44.1C) water (Tf=32.1C)
asked by Amy 
physics
A neutron in a reactor makes an elastic headon collision with a nitrogen atom that is initially at rest. (The mass of the nitrogen nucleus is about 14 times that of the neutron.) (a) What fraction of the neutron's kinetic energy is transferred to the
asked by heather 
Physics
A nonuniform 2.0kg rod is 2.0 m long. The rod is mounted to rotate freely about a horizontal axis perpendicular to the rod that passes through one end of the rod. The moment of inertia of the rod about this axis is 4.0 kg m2. The center of mass of the rod
asked by Anonymous 
HELP A.S.A.P. PLEASE: linear programmingmaths
A company makes tennis and squash rackets. Each tennis racket requires two units of aluminum and one unit of nylon. Each squash racket requires 1.8 units of aluminum and 0.8 units of nylon. The company has 1000 units of aluminum and 800 units of nylon
asked by garnel 
statistics/probability
A game consists of tossing two coins, first a dime and then a nickel. For each coin which comes up a head you win the value of the coin. For each coin which comes up a tail you get nothing. {HH,HT,TH,TT}  each outcome with probability .25  winnings are
asked by carmen, please help!! 
math calc 2
a 30 m chain hangs vertically from a cylinder attached to a winch. assume there is no friction in the system and that the chain has a density of 5 kg/m. how much work is required to wind the entire chain onto the cylinder using the winch?
asked by arnulfo 
math
A rubber ball is dropped from an unknown height. It bounces back to 60% of its original height. Write an equation you can use to find height.
asked by Dene' 
Chemistry
What element forms an ion with an electronic configuration of [Xe] and a –2 charge?
asked by Bill 
PHYSICS!
An air mattress is 2.36 m long, 0.640 m wide, and 12.2 cm deep. If the air mattress itself has a mass of 0.252 kg, what is the maximum mass it can support in fresh water?
asked by EMM 
Chemistry
Assuming that the smallest measurable wavelength in an experiment is 0.330 fm (femtometers), what is the maximum mass of an object traveling at 157 m·s^–1 for which the de Broglie wavelength is observable? mass = ? kg
asked by Bill 
Physics
A rocket of mass 1.0x10^3kg is being fired to a height of 5.0 x 10^3 m. The rocket engine shuts off when the rocket reaches a height of 1.0x10^3m, and the rocket coasts up to 5.0 x 10^3 m. A) What velocity must the rocket have at the 1.0x10^3 m point to
asked by Chris 
chemistry
To what volume must 25.0mL of 18.0M H2SO4 be diluted to produce 1.50 M H2SO4?
asked by katie 
statistics
Two boats, the Prada (Italy) and the Oracle (U.S.A.), are competing for a spot in the upcoming America’s Cup race. They race over a part of the course several times. Below are the sample times in minutes. Assume the population standard deviations are not
asked by Anonymous 
physicsmechanicscollisions,momentum, impulse
You are at the controls of a particle accelerator, sending a beam of 2.40×107 protons (mass ) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the nuclei of the unknown
asked by HANNE 
Math (Area of Shapes)
Suppose that the spool is 1m long and has an inner diameter of 20 cm and an outer diameter of 60 cm. Approximately, how long a piece of 5 cm thick rope can be wound onto this spool? ( Assume that the rope is wound neatly, in layers. Each layer will consist
asked by Chelsea 
chemistry
If 25.0mL of 0.56 M H2SO4 is diluted to a volume of 125 mL, what is the molarity of the resulting solution?
asked by katie 
Chemistry
Graham's Law predicts that the ratio of the rate of effusion of gas X to the rate of gas Y equals the square root of the INVERTED ratio of their molar masses: Rate of X/Rate of Y = SQRT(My/Mx) What is the ratio of rate of effusion of Helium to Nitrogen
asked by Anonymous 
Physics HELP!!
Two masses of 3.40kg and 4.55kg are connected by a light string that passes over a frictionless pulley. Determine the tension in the string. b). Calculate the acceleration of m
asked by Angie 
Science physics
A 10 kg lawnmower is pushed along by a force applied at a 20* angle to the horizontal. If the mower accelerates at 3.4 m/s what is this force?
asked by Ray 
chemistry
A 150mL sample of 0.45 M HNO3 is diluted to 450 mL. What is the molarity of the resulting solution?
asked by katie 
science
Why do clouds form behind the moving cold front?
asked by dorothy morlan 
English.
In “Do Not Go Gentle into That Good Night,” Dylan Thomas urged his father to resist (1 point) aging. despair. quitting. death. How does Dante feel about the journey he’s about to take with Virgil? (1 point) worse than before he talked with Virgil
asked by Anastasia 
chemistry
using the following salts listed below, calculate the moles of acid and conjugate base needed to make 100 ml of 0.50 M, ph 6.5,6.7, and 6.8 phosphate buffer solution. (For H2PO4, pka=6.64) Salt Molar mass, g/mol KH2PO4 136.09 NaH2PO4*H2O 137.99
asked by alleyx3 
Math 8R: Homework Check  Part 2
Part 2: Simplify by combining like terms and using the distributive property 11. 3x + 5x Answer: 8x 12. 3x + 5y  2x + 8, Answer: 1x + 5y + 8 13. 9 + 5m + 6b  2m  4, Answer: 3m + 5 + 6b 14. 3ab + 6c  ab + 10  2c, Answer: 2ab + 4c + 10 15. 6(m+3),
asked by Laruen 
algebra
A 40 inch board is cut into two pieces so that the shorter piece is twothirds of the length of the longer piece. What are the lengths of the two cut pieces?
asked by jaime 
physics
A billiard ball moving at 5.60 m/s strikes a stationary ball of the same mass. After the collision, the first ball moves at 4.99 m/s, at an angle of 27.0 with respect to the original line of motion. (Enter the direction with respect to the original line of
asked by heather 
DBU
The mean time to complete a psychology exam is 34 minutes with a standard deviation of 8 minutes. Assume the distribution is normal. Find the probability of a student taking less than 28 minutes.
asked by KiKi 
precalculus
Use a Double or HalfAngle Formula to solve the equation in the interval [0, 2π). (Enter your answers as a commaseparated list. Round your answers to three decimal places where appropriate.) sin 2θ + sin θ = 0
asked by Ama 
Physics HELP!!
A 4165.0kg truck is parked on a 15.8deg slope. What is the friction force on the truck?
asked by joane 
algebra
Two pumps can fill a water tank in 256 minutes when working together. Alone, the second pump takes times as long as the first to fill the tank. How many minutes would it take the first pump to fill the tank?
asked by tiffany 
Science
Sustainable development can be viewed as a compromise between which two groups? a) Those who value the environment and those who value economic development b) Those who value human rights and those who value animal rights c) Those who value economic
asked by Tammy 
physics!
Wildlife biologists fire 20kg rubber bullets to stop a rhinoceros charging at 0.83m/s. The bullets strike the rhino and drop vertically to the ground. The biologists' gun fires 15 bullets each second, at 73m/s , and it takes 31sto stop the rhino.
asked by Jcota2 
Chemistry
A container contains 3.2 g of O2 gas. The volume of the gas at STP is A. 2.24L B. 224.0L C. 0.224L D. None
asked by Anonymous 
chemistry
given the density of helium is 0.1785g/cm3 and the density of argon is 1.784g/cm.3 estimate the density of neon
asked by Jessa 
chemistry 100
how you could separate the components of a mixture of PbCL and NaSO and recover the two substances
asked by Tina 
Math
The El Paso Middle School girls' basketball team is going from El Paso to San Antonio for the Texas state championship game. The trip will be 560 miles. Their bus travels at an average of 60 miles per hour. Estimate the distance the bus travels in 2 hours.
asked by Jason 
Physics
A block slides down a frictionless plane having an inclination of 18.9deg. If the block starts from rest at the top and the length of this incline is 2.21m, find the acceleration of the block. b). What is the block's speed when it reaches the bottom of the
asked by joane 
annual interest
you invested 12000 in two accounts paying 5% and 7% annual interest. If the totak interest earned for the year was 760 how much was invested at each rate?
asked by Anonymous 
Chemistry(Please help)
I know that to calculate the specific rotation for a compound you do observed rotation / path length(dm) * conc. (g/ml). I am confused about how to calculate the specific optical rotation for a compound. Thank you for your help!
asked by Hannah 
Physics
Determine the stopping distance for a skier moving down a slope with friction with an initial speed of 20.6m/s. Assume μk=0.178 and θ=5.27.
asked by Angie 
Physics
This is a homework question and I have no idea what I'm doing wrong. A heavy sled is being pulled by two people as shown in the figure. The coefficient of static friction between the sled and the ground is ìs = 0.611, and the kinetic friction coefficient
asked by Jamey 
physics
The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. The other box is heavier and rests on a ramp that is less steep. The boxes are released from rest at A and allowed to slide down the ramps. The
asked by greg 
Organic Chemistry
Identify the error in the following scenario and indicate how you would fix the error: A TLC of a two component mixture of pentene and 1,3diethylbenzene was run in acetone. An Rf value of 0.90 was reported.
asked by Sarah 
pyshc101
As Bridget is walking through a parking lot, a bicyclist swerves toward her. Her heart races and sweat breaks out as she jumps out of harm’s way. Soon, Bridget’s heart begins to decrease and return to a regular rhythm. This calming reaction is due to
asked by justin 
algebra
Two persons are to run a race, but one can run 10 meters per second, whereas the other can run 6 meters per second. If the slower runner has a 70meter head start, how long will it be before the faster runner catches the slower runner, if they begin at the
asked by Anonymousjm 
Physics
a refree throws a basketball vertically upward with an inital speed of 5.0m/s determine the maxium height above the floor reached by the basketball if it starts from a height of 1.50m
asked by Sara 
Physics
a refree throws a basketball vertically upward with an inital speed of 5.0m/s determine the maxium height above the floor reached by the basketball if it starts from a height of 1.50m
asked by Sara 
Math
1. The slope of the tangent line to a function at a point is equivalent to __. a. the slope of the secant at that point b. the slope of the cosecant at that point c. the rate of change of the function at that point d. the slope of the secant near that
asked by hnc 
math
an artist is going to an art fair. the artist will charge $20 for small prints $45 for large prints. the artist would like to sell twice as many small prints as large prints. the booth the artist is renting costs $510. how many of each size print must the
asked by Dee 
Algebra
Hertzy Car Rental: Charge a fixed rate of $58 with NO mileage charge. Alabo Car Rental: Charge 35 cents per mile. Nifty Car Rental: Charge a fixed rate of $28 plus 15 cents per mile. Mrs. Jones wants to rent a SUV to visit her parents in Idaho– she
asked by Denise 
MATH ! plzz help
A wireless phone company charges a monthly fee of $39.99 plus $0.49 per minute for usage that exceeds the included minutes. Write an equation for the monthly cost 'c' in terms of the number of exceeded minutes 'm'.Solve the equation to find the cost when
asked by Maryam :) 
chem
bubbles initially forms and escapes down the bottom of the glass in the rising water experiment. What gas is responsible for this bubbles? the air bubbles escaping from the jar or bottle are evidence of the fact that the air in the jar or bottle is
asked by Draden 
Finances
Analyze the following scenario: River County is planning several capital acquisitions for the coming year. These include the purchase of two new garbage trucks at $150,000 each, one new bulldozer at $240,000, three new riding lawn mowers at $16,000 each,
asked by Anonymous 
physics
A ray of light is incident at an angle of 20degrees to the normal on one face of an equilateral prismm made in glass of refractive index 1.523. Trace the ray of light through the prism and find the total deviation produced.
asked by Please help Elena 
Physics
A concave mirror is constructed so that a man at a distance of 19 cm from the mirror sees his image magnified 2.0 times. What is the radius of the curvature? OK so I have tried to work this out and can't seem to find the answer. Here is what I got. Please
asked by Rachel 
chemistry
what is free energy for h2+br2=2hbr at 25 degrees celcius
asked by lenz 
calculus
(Use the fact that the kinetic energy of a particle of mass "m" moving at speed "v" is (1/2)m(v^2). Slice objects into pieces in such a way that the velocity us approximately constant on each piece.) Q: Find the kinetic energy of a rod of mass 10kg and
asked by mike 
Geography
Okay so here is the question Suppose you are an official in an Eastern European nation. Write a letter to a major manufacturer in the United States. In the letter, explain why the manufacturer might want to set up a factory in your nation. Choose a
asked by Blake 
PHYSICS 2
A horizontal wire that runs eastwest carries a steady current to the east. A Cshaped magnet is placed so that the wire runs between the poles, with the north pole above the wire and the south pole below. What direction of the magnetic force on the wire
asked by Ashley 
english
can you unscramble this halloween word? ouraclnd
asked by Jessica 
English
What is the CORRECT pronunciation of "Thrinacia?"
asked by Anonymous 
Physics URGENT!!!
A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 21.0° with the horizontal. A 37.0 kg piece of luggage is
asked by Shannon 
PHYSICS!
A 8.52 kg block of metal is suspended from a scale and immersed in water as in Figure P9.30. The dimensions of the block are 12.0 cm x 10.0 cm x 10.0 cm. The 12.0cm dimension is vertical, and the top of the block is 9.0 cm below the surface of the water.
asked by EMM 
xiamen university
The probability that a person catches a cold during the cold and flu season is 0.62. Assume that 5 people are chosen at random. A) What is the probability that exactly four of them will catch a cold? B) What is the probability that three or more of them
asked by agak 
Chemistry
Why did you need to know the density of the bleach solution? Why didn't you measure the density of h2o2 solution as well? Stoichiometry lab problem
asked by HELP PLEASE 
composition&communication
I have to make a thesis statement for my essay I have made one but it's not good enough. It has to be 25 words or less and be about flat irons and curling irons including my bias and four points i'll be compare and contrasting them on. My teacher gave me
asked by Katelynn 
Math
Assume that the average annual salary for a worker in the United States is $30,500 and that the annual salaries for Americans are normally distributed with a standard deviation equal to $6,250. Find the following: (A) What percentage of Americans earn
asked by Michael 
PHYSICS
A quarterback throws the football to a stationary receiver who is 19.7 m down the ﬁeld. The football is thrown at an initial angle of 43◦ to the ground. The acceleration of gravity is 9.81 m/s^2. a) At what initial speed must the quarterback throw the
asked by JASPER 
physical
You are on a train that is traveling at 3.0 m/s along a level straight track. Very near and parallel to the track is a wall that slopes upward at a 12° angle with the horizontal. As you face the window ( 0.715 m high, 2.29 m wide) in your compartment, the
asked by tim 
algebra
The combined area of New York and California is 204,192 square miles. The area of California is 108,530 square miles more than that of New York. Find the land area of each state. CA, mi2 NY, mi2 .
asked by Anonymousjm 
Physics
1. How much work or energy (in J) does a 150 W light bulb convert to heat and light in 1.0 h? 2.The force of gravity on a box of apples is 98.0 N. How much work will you do (a) if you lift the box from the floor to a height of 1.2 m? (b if you carry the
asked by HanuP28O 
physics
In a headon collision, a car stops in 0.30s from a speed of 30m/s . The driver has a mass of 73kg , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?
asked by Anonymous 
Discrete Mathematics
There are 20 people in a club. In how many ways can the club elect a president, a secretary and a treasurer, on person can hold more than one office?
asked by Vevea Tepou 
college algebra
list the intercepts and test for symmetry. y=8x/x^2=49
asked by mary 
Physics
A 3.0m long uniform beam of mass 24kg hangs off the edge of a building with 2.5m in the air, as shown in the diagram. A bucket of bolts of mass 30.kg rests on the board over the building at a distance of 10.cm from the edge of the beam. How far from the
asked by Moustapha Jones 
English
Help with annotating and finding overall them! Help!!!!! “Hope” is the thing with feathers By Emily !@#$%^&inson “Hope” is the thing with feathers  That perches in the soul  And sings the tune without the words  And never stops  at all  And
asked by Brian 
physics
What focallength lens would you need to place next to a converging lens of focal length 29 cm to create an effective focal length of 14 cm for the combination?
asked by Jeanette 
Physics
The drawing shows two frictionless inclines that begin at ground level (h = 0 m) and slope upward at the same angle θ. One track is longer than the other, however. Identical blocks are projected up each track with the same initial speed v0. On the longer
asked by Tim 
calculus
the region bounded by the quarter circle (x^2) + (y^2) =1. Find the volume of the following solid. The solid whose base is the region and whose crosssections perpendicular to the xaxis are squares.
asked by mike 
college algebra
the midpoint of the line segment from p1 to p2 is (1,3). if p1=(6,7) what is p2?
asked by ladybug 
physics
suppose an automobile has a kinetic energy of 2900J. when it moves with 3 times the speed, what will be its kinetic energy? answer in the units of joules
asked by Emily 
physics
explain the scientific method for dropping a penny from the empire state building to see if it will penetrate someones head below
asked by amy 
college algebra
if (a,20) is a point on the graph of y=x^2+9x, what is a?
asked by ladybug 
chemistry
A student finds that 22.06 mL of 0.7270 M lead nitrate is needed to precipitate all of the iodide ion in a 50.00mL sample of an unknown. What is the molarity of the iodide ion in the student's unknown?
asked by Anonymous 
algebra
A: 7x+7y=77 B: 20x5y=35
asked by jaime 
Internet Server Environments
What is Cold FusionMX and how would you accommodate on a Windows 2000 server?
asked by Ann 
READING READER RESPONSE
MOTHER'S FLETCHER GIFT THREE INCIDENTS THAT OCURR IN THE STORY
asked by Anonymous 
Physics
The acceleration due to gravity calculated this way works well for objects near the Earth’s surface. How would you have to change the above equation if the object was 100,000 meters above the ground?
asked by Lay 
Math
The diameters of grapefruits in a certain orchard are normally distributed with a mean of 5.52 inches and a standard deviation of 0.46 inches (A) What percentage of the grapefruits in this orchard is larger than 5.45 inches? (B) A random sample of 100
asked by Michael 
physics
A spherical generator is used to produce a 15.00D surface on glass of refractive index 1.80. The diameter of the cutting tool is 80mm and the radius of the cutting surface is 4mm. What is the angle between the axis of the tool and the axis of the lens?
asked by Please help if u can 
math
Can someone please help me? I don't know how to work this out, and my friends don't either. Eight hot dogs and ten buns come in separate packages. a. Is the number of hot dog packages proportional to the number of hot dogs? Explain. b. Is the number of hot
asked by Grace 
art
The word "Pantheon" refers to: A. the people of the Pan dynasty. B. the ancient hill of Rome where Nero built his house. C. "all the gods".
asked by Kala 
Science
In the topic of centre of gravity why is it difficult to topple a doll in a circular base.
asked by Juanita 
Physics... Help!
A bullet of mass m=0.060 kg hits a 5.0 kg block with an initial speed of 225 m/s. The block is connected to a spring that is attached to a wall. The friction between the block and the table is negligible. Upon impact, the bullet bounces back from the box
asked by Rob 
Physics help
A car travels in a circle whose radius is 31 m, with a speed of 19 m/s. (1) What is the magnitude of the car's acceleration? _____ m/s2 (2) What is the nature (origin) of the horizontal force on the car? (What is exerting the force?) The force causing the
asked by arcos15 
science
Why do humans use running shoes, winter boots, snowshoes, skis and flippers? Why are these not biological adaptations? Use animals as examples.
asked by Ruby 
calculus
(Use the fact that the kinetic energy of a particle of mass "m" moving at a speed "v" is (1/2)m(v^2). Slice object into pieces in such a way that the velocity is approximately constant on each piece.) Q: Find the kinetic energy of a phonograph record of
asked by mike 
Physics
need help with this problem :/ A circular coil (980 turns, radius = 0.078 m) is rotating in a uniform magnetic field. At t = 0 s, the normal to the coil is perpendicular to the magnetic field. At t = 0.027 s, the normal makes an angle of 45o with the field
asked by derek 
PHYSICS!
A 8.52 kg block of metal is suspended from a scale and immersed in water as in Figure P9.30. The dimensions of the block are 12.0 cm x 10.0 cm x 10.0 cm. The 12.0cm dimension is vertical, and the top of the block is 9.0 cm below the surface of the water.
asked by Emily 
physicsmechanicscollisions,momentum, impulse
You are at the controls of a particle accelerator, sending a beam of 2.40×107 protons (mass ) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the nuclei of the unknown
asked by HANNE 
Physics
(a) Suppose that on the moon an astronaut hit a golf ball so that it left his club at a speed of 45ms1, at an angle of 20degrees to the horizontal. calculate the time of flight of the ball. (b) calculate the horizontal distance travelled by the ball
asked by Adam 
Physics
A spherical generator is used to produce a 15.00D surface on glass of refractive index 1.80. The diameter of the cutting tool is 80mm and the radius of the cutting surface is 4mm. What is the angle between the axis of the tool and the axis of the lens?
asked by Please help! 
Math
If f(x)=3x^25x, find the f'(2) & use it to find an equation of tangent line to the parabola y=3x^25x at the point (2,2). My ans is f'(2)=7 & y=7x12. What is parabola exactly? & is the any possibility if the eqtn of f(x) is not the same with parabola
asked by Ifi 
psychology
Thesis Statement regarding the overall wellness of young children and the role an early education setting can play in a young child’s health and wellbeing.
asked by jessica 
Factor Theorem Math
Use the Factor Theorem to determine the rational zeros of this function. Then use other methods to determine any other zero of this function. 4x^4x^311x^22x+6 (I already did p/q and found a total of 16 possible zeros. I synthetic divide all of them and
asked by Nikki 
Anthropology
Caste systems are most common in societies: (Points : 1) that were previously ranked. that have a tradition of slavery. that have a great deal of occupational specialization. that have monetary systems.
asked by Maria 
physics
I posted it incorrectly...sorry! Please explain the steps in the scientific method for the mythbusters program that tests to see if a penny dropped from the empire state bldg. could actually penetrate someones skull if it hit them. thanks!
asked by amy 
physics
A spherical generator is used to produce a 15.00D surface on glass of refractive index 1.80. The diameter of the cutting tool is 80mm and the radius of the cutting surface is 4mm. What is the angle between the axis of the tool and the axis of the lens?
asked by Please help 
Chemistry
A Balloon Time® tank holds 15% excess capacity to fill 50 helium balloons measuring 9” or 0.5 ft3 in volume at 1 atm and 22 oC. The gauge pressure of a new tank is 260 psi. What is the volume of a Balloon Time® tank in ft3?
asked by Veronica 
physics
A spherical generator is used to produce a 15.00D surface on glass of refractive index 1.80. The diameter of the cutting tool is 80mm and the radius of the cutting surface is 4mm. What is the angle between the axis of the tool and the axis of the lens?
asked by Please help! 
Chemistry Lab
The experimental data you entered is: Trial #1 Trial #2 Trial #3 Mass: gelatin capsule (g) .123 .118 .122 Mass: whole alkaseltzer tablet (g) 3.230 3.230 3.230 Mass: capsule + alkaseltzer sample (g) .822 .882 .677 Mass: system before reaction (g) 23.109
asked by Tyler 
math
Mrs Olive gave her 4 children a sack of candy to share. Mark ate 1/2 of the candy in the sack and passed the sack to Rachel. Rachel ate 1/3 of the remaining candy and passed the sack to Fred. Fred then ate 1/4 of the candy that remained and passed the sack
asked by carson 
Physics
The differential gear of a car axle allows the wheel on the left side of a car to rotate at a different angular speed than the wheel on the right side. A car is driving at a constant speed around a circular track on level ground, completing each lap in
asked by Sam 
college algebra
find the equation for the line with the given properties. Express in slope intercept form. Containing points P=(3,4) anda Q=(1,1)
asked by ladybug 
Physics
a helicopter, travelling horizontally at a constant velocity, is 82m above ground. The pilot prepares to release a package intended to land on the ground 96m horizontally ahead. no air resistance. He lets the package drop. what is the velocity of the
asked by KIRA 
chemistry
what is the normality of sodium carbonate of 55 grams in a solution of 4000 ml
asked by apoc 
algebra
solve the equation(enter solution from smallest to largest. if there no solution enter none) 4x^2=15x+4
asked by missfubuc 
PhysicsPlease Help!!
A bullet of mass m=0.060 kg hits a 5.0 kg block with an initial speed of 225 m/s. The block is connected to a spring that is attached to a wall. The friction between the block and the table is negligible. Upon impact, the bullet bounces back from the box
asked by Rob 
ALG 2!!!
please solve and show work 5(2x  7) = 33  3(6x + 4)
asked by tyneisha 
BIOLOGY/CHEMISTY
a student uses the unduiluted glucose stock solution in a reaction and finds that the absorbance values over 90 seceonds are all 1.900. What does this result tell you abou the enzyme activity of glucose oxidase in this reaction after the 90 seconds time
asked by Debbie 
Physics HELP!! pleasee
an object on an inclined ramp of mass 1.39kg. The angle of the inclined surface is 29deg with the horizontal. The object on the ramp is connected to a second object of mass 2.17kg on a horizontal surface below an overhang that is formed by the inclined
asked by Angie 
CHEMISTRY
Describe how you would prepare 250. mL of a .500 stock solution of sodium hydroxide. (show all work)
asked by TYLER 
MATH ! plzz help
Write an equation that has (2,6) as a solution. Explain how you found the equation.
asked by Maryam :) 
Math
A rectangular table top measures 7 / 9 of a meter long by 2 / 9 of a meter wide. What is the area
asked by Tamara 
chemistry
What will be the total mass of a 73.3 gram flask and its contents if it contains 20.1 mL of concentrated sulfuric acid with density 1.84 gram per mL?
asked by Jas 
Math
If f(1)=2 & f'(x)_< 1.8 for 1_< x_< 8, what is the largest possible value of f(8)? Can someone help me on this question and plz provid me some calculation for this question.
asked by Ifi 
science
Why do human beings use running shoes, winter boots, snowshoes, skis and flippers? Why are these not biological adaptations? Use animals as examples. Write 45 sentences.
asked by emily 
Math
Calculate dy/dx, (x^3)(y^7) + 16xy^6=0 My ans is (y(163x^2y))/ x(96+7x^2y) but at wolfram is y^6(3x^2y+16). Btw i use product rule to dy/dx. Need someone to recheck my ans.
asked by Ifi 
sciencephysics
What is the formula to calculate the speed of the electron the has a mass of 0.910000000000000000000000000000 kg and a radius of 0.5290000000000 m?
asked by Nixie 
MATHS
IFE,F,G,H ARE RESPECTIVELY THE MID POINTS OF THE SIDE OF A PARALLELOGRAM ABCD SHOW THAT AREA OF EFGH IS EQUAL TO HALF AREA OF ABCD.
asked by VIKASH KUMAR GUPTA 
Math
Differentiate f(x)= (82x)^3(x^2+1)^5. My ans is 2(82x)^2(x^2+1)^4(3x^210x+37). Plz recheck my simplify ans. my simplify ans is not the same as wolfram but the long ans is same with wolfram
asked by Ifi 
Math
How to differentiate e^e^x? Ans at wolfram is e^(x+e^x). I need the calculation method.
asked by Ifi 
Algebra
Solve the equation. (Enter solutions from smallest to largest. If there is no solution, enter NONE in the answer boxes.) x2  5x + 5 = 0 x = x =
asked by Anonymous 
Math
Differentiate ln (1+ cos x)... My ans is (sin x)/ (1+cos x), but at wolfram is tan (x/2). I think they simplify it but how did they do it? Sorry for my little knowlegde....
asked by Ifi 
maths
throw how many degrees does the minute hand turn in 1 hour
asked by sindhu 
math
3''4y'5y
asked by Nekabari 
geografie
welche einflÃ¼sse hat die amerikanische lebensweise in unserem alltag?
asked by iris 
math
Is a package of 8 hot dog buns proportional to a package of 10 hot dog franks?
asked by Allie 
nutrition
Could someone give me an example or guidelines to complete the following paper? Diane Nelson is a 49 year old, Native American female. She is currently being treated for hypertension, hypothyroidism and elevated LDL cholesterol levels. She has a family
asked by donna 
college algebra
find the equation of the line in slope inntercept form. (1,1) and (2,1) I know that I have to use m=y^2y^1/x^2x^1 which is slope form then I get: m=1(1)/210 which I substitue m= ? is where I get lost but then I know the next part is: y=mx+b then I
asked by ladybug 
Math
There are 285 7 th graders there are 19 more girls than boys what are the totals for each
asked by Steven 
chem
why will Na2CO3 + AgNO3 create a percipitate? I thought that one of the compounds has to be insoluble for it to form a percipitate? but according to the solubility rules they both are soluble
asked by rebekah 
Statistics
A university has an exclusive agreement with the coffee chain Monobeans. Several students and faculty complained about their lack of baked goods. Looking for a better provider of carbs and caffiene, the university management rents out for one trial
asked by Anonymous 
Physics
A 7.37kg fish is held by a taut string. If the fish is accelerated upward at a rate of 3.62m/s^2, what would be the tension in the string?
asked by Angie 
algebra
can someone plzs help me solve the equations by finding the exact solutions ln(x)ln(5)=7 the next one is ln(e)=ln(with a v like symbol with 2/x)ln(e)
asked by missfubuc 
Krakatoa Volcano
What landforms were made because of the eruption of the Krakatoa volcano?
asked by Vanilla Frost 
Psychology
Sources of stress do not automatically cause stressrelated problems. Moderators of stress, which can include our personal strengths, might mean that we can have a healthier and more productive life in spite of life's challenges, or maybe even because of
asked by william 
Math
A number between 10 and 20. It rounds to 20. One of this number's digits is 5 greater than the other. What number is it?
asked by Sharon 
Logic
Is a fallacy considered an argument that makes a mistake in deriving a conclusion?
asked by Lyn Proctor 
algebra
x2/7  x4/7
asked by Anonymous 
Math
Let f(t)=2t^42x^29. at what x does f have a local or absolute minimum or maximum? I think the question is wrong bcus it is impossible to to have 2 unknown to find the relative max or min...right? Sorry if im wrong. So i change it to f(x)=2x^42x^29 so
asked by Ifi 
trig
Solve for x please? x/x+3  1/x+2 = x/2x+4
asked by Robbie 
math
how can you estimate heights and distances you can't easily measure with rulers or tape measures by using the following methods? A. shadows and simular triangles B.mirrors and simular tiangles c. small tiangles nested within larger triangles
asked by dorothy morlan 
math
Atriangle is simular to another one with a scale of 1.5
asked by dorothy morlan 
algebra
find an equation of i line given the slope and one point on the line m=2;(3,2)
asked by stephanie 
choir
I definitely agree! I aywals have a much more fun time when I am trickortreating on a weekend or near that like Friday. I guess Halloween doesn't aywals fall on the day you want it to! Boo* hoo! Get it? Boo ?
asked by eRDooCQt 
science
High pressure systems are regions where air moves downward usually a few or no clouds form in this condition. Where r strongest winds found/
asked by dorothy morlan 
Math
find the intervals of increase and decrease of f(x)=3/(x*2+11) 1 ? My f'(x) is6x/(x^2+1)^2, after that i didn't know how to proceed next bcus i didn't know how to find x to substitute in the f'(x).
asked by Ifi 
Math
Let f(x) be the parabola x^2+16x16. find the point (x,y) on f such that tangent line to f at (x,y) passes through the origin. My ans is (8,48). First i do f'x then i find x and lastly i find y. I do this because the max/min point is the point where
asked by Ifi 
BIOLOGHY
WHICH OF THE FOLLOWING DESGNATES A NORMAL HUMAN MALE
asked by LINDA 
Gr 9 geography
What is the geologic history of the subarctic, like Labrador in Canada?
asked by Iza 
English
Contain some national and international news , but focus on news relating to specific area of the country. hhat type of newspaper is this ?
asked by Anna 
programming
the driverite insurance company provides automobile insurance policies for drivers. design a FLOWCHART for the following:
asked by GLENN 
physical science
A substance whose 0xidation number decreases during a chemical reaction
asked by sthabiso 
Math
How to differentiate f(x)=e^(xlnx)? I get f'(x)=e^(xlnx) (1+lnx) while at wolfram is x^x(ln x+x)...sorry for my miscalculation / typo error...
asked by Ifi 
chem
why is it necessary to add water to the can before heating it in the can imploding wxperiment? what is the significant of the water?
asked by Draden 
Math
Differentiate y=4^(3x^2).. i need to know the calculation step..thanks for the help....
asked by Ifi 
MathQuartic Equation
Reduce this equation using the quadratic formula, factoring, or other algebraic method to determine the other zeros of the function. F(x)= 4x^4  x^3  11x^2 2x +6
asked by Ash 
chemistry
How many milliliters of 0.524 M HNO3 contain 3.13 g HNO3?
asked by bebo 
chem
how does the tepmperature , pressure and mole parameter explain the suddden collapse of the can in imploding the can experiment?
asked by Lala08