Questions Asked on
December 4, 2010

Physics
A 4.00mlong, 500 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 70.0 kg construction worker stands at the far end of the beam. What is the magnitude of the torque about
asked by Anonymous 
calculus
The strength of a rectangular beam is proportional to width*depth^2. What are the dimensions of the strongest rectangular beam that can be cut out of a 12 inch diameter log?
asked by Susan 
Chemistry
A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is changed from a. 200. K to 400. K b. 200. C to 400. C How do you know if it's kelvin or celsius? k= c
asked by danny123 
Chemistry
In the reaction: P4 (S) +Cl2 (g)PCl5(s), 1. If you have 10.00 grams of Phosphorus to react with 220 grams of Chlorine gas, what would be the theoretical yield of PCl5(s), in grams? 2. Why was there condensation of the beaker of cold water when a blue
asked by Jerome 
chemistry
The copper(I) ion forms a chloride salt that has Ksp = 1.2 106. Copper(I) also forms a complex ion with Cl ‾. Cu+(aq) + 2 Cl ‾(aq) reverse reaction arrow CuCl2‾(aq) K = 8.7 104 Calculate the solubility of copper(I) chloride in pure water. (Ignore
asked by Anonymous 
physics
A car is driven 145 km west and then 65 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?
asked by Anonymous 
chemistry
What is the lattice energy of NaBr? heat of formation of NaBr = 362 kJ/mol heat of sublimation for Na = 107.30 kJ/mol ionization energy for Na = 496 kJ/mol bond dissociation energy for Br2 = 190 kJ/mol electron affinity of Br = 325 kJ/mol heat of
asked by chemistry 
Math
Use the related acute angle to state an equivalent expression: a) tan 110 degrees b)sin 350 degrees
asked by Emily 
Chemistry
For the following reaction, 5.20 grams of propane (C3H8) are allowed to react with with 23.1 grams of oxygen gas. propane (C3H8) (g) + oxygen (g) carbon dioxide (g) + water (g) What is the maximum amount of carbon dioxide that can be formed? grams What is
asked by Austin Jekins 
Physics
A father pushes horizontally on his daughter's sled to move it up a snowy incline, as illustrated in the figure, with h = 3.9 m and θ = 11°. The total mass of the sled and the girl is 35 kg and the coefficient of kinetic friction between the sled runners
asked by Sandi 
chemistry
a mixture of methane and ethane is stored in a container at 294 mmHg. The gases are burned in air to form co2 and h2o. if the pressure of co2 is 357 mmhg measured at the same temperature and volume as the original mixture, calculate the mole fraction of
asked by maggie 
Maths  Probability
Tickets numbered 1 to 1000 were sold in a raffle for which there was one prize. Mr Kahn bought all the tickets containing at least one '3' because '3' was his lucky number. What was the probability of Mr Kahn winning?
asked by Paige 
Physics
An airplane is traveling v = 850 km/h in a direction 38.5° west of north (Fig. 334). Figure 334. (a) Find the components of the velocity vector in the northerly and westerly directions. 1 km/h (north) 2 km/h (west) (b) How far north and how far west has
asked by Anonymous 
math
Complete the following probability distribution table and then calculate the stated probabilities. Outcome a b c d e Probability 0.1 1Your answer is correct. 0.43 0.1 0.27 (a) P({a, c, e}). 2Your answer is correct. (b) P(E ∪ F), where E = {a, c, e} and F
asked by Liz 
Chemistry
Write a nuclear equation for the most likely mode of decay for each of the following unstable nuclides: Kr74, Th221, Br85, Ar33
asked by Ari 
Physics
a 55 kg skateboarder starts out with a speed of 1.8 m/s. he does +80 J of work on himself by pushing with his feet against the ground. in addition, the friction does 265 J of work on him. in both cases, the forces doing the work are nonconservative. the
asked by Justin 
chemistry
Lakes that have been acidified by acid rain can be neutralized by liming, the addition of limestone (CaCO3). How much limestone in kilograms is required to completely neutralize a 5.8×109 L lake with a pH of 5.6? thanks
asked by amy 
Physics
A nuclear power plant has an electrical power output of 1200 MW and operates with an efficiency of 31%. If excess energy is carried away from the plant by a river with a flow rate of 1.0 x 10^6 kg/s, what is the rise in temperature of the flowing water?
asked by Stefan 
English
Can you please check if the following definitions are possible? Thank you 1)The iamb is an unstressstress pattern like the word "upon". 2) The anapaest is the unstressunstressstress pattern. 3)The oxymoron is a figure of speech in which two
asked by Franco 
Business Finance
Vandalay Industries is considering the purchase of a new machine for the production of latex. Machine A costs $2,190,000 and will last for 7 years. Variable costs are 38 percent of sales, and fixed costs are $122,000 per year. Machine B costs $4,530,000
asked by Leigh 
physics
At the instant a traffic light turns green, a car starts moving with a constant acceleration a of 4.00 m/s2. At the same instant a truck, traveling with a constant speed of 10.09 m/s, overtakes and passes the car. How far beyond the traffic light will the
asked by Brittany 
chemistry again
calculate the normality of a solution prpared by dissolving 220.0 mg of K2Cr2O7 in 100 ml solution that will be used to oxidize ferrous chloride according to the unbalanced reaction.
asked by Anonymous 
chemistry
Calculate the pH of 1.28×10−3 M KOH. thanks.
asked by amy 
Physics  bungee jumping
In a head dip bungee jump from abridge over a river, the bungee cord is fastened to the jumpers ankles. The jumper then steps off and falls towards the river until the cord becomes taut. At that point, the cord begins to slow the jumper's descent, until
asked by Farah 
physics
A wooden box with a mass of 10.0kg rests on a ramp that is inclined at an angle of 25 degrees to the horizontal. A rope attatched to the box runs parallel to the ramp and then passes over a frictionless pulley. A bucket with a mass of m hangs from the end
asked by Nicolee 
Physics  elastic collision
A student flings a 23g ball of putty at a 225g cart sitting on a slanted air track that is 1.5m long. The track is slanted at an angle of 25deg with the horizontal. If the putty is traveling at 4.2m/s when it hits the cart, will the cart reach the end of
asked by Farah 
Chemistry
16.7 grams of chlorine gas are allowed to react with with 3.31 grams of water What is the maximum amount of hydrochloric acid that can be formed in grams. What is the maximum amount of hydrochloric acid that can be formed? grams What is the FORMULA for the
asked by Austin Jekins 
math and music
How would you go about listing all of the integer ratios? I would like to have the integers listed in ascending order by the product of each integer's numerator and the denominator. This is because in music, more "complex" ratios sound more dissonant.
asked by Gray 
physics
A force of 100 N is applied tangentially to a disk of radius 10 cm and mass 0.5 kg. the disk is initially at rest. What is the angular acceleration of the disk? How many revolutions does the disk goes through after 10 sec. How much rotational work was done
asked by Maa 
physics
The space probe Deep Space I was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of
asked by anonymous 
physic
A water skier has a mass of 73 kg. Find the magnitude of the net force acting on the skier when she lets go of the tow rope and glides to a halt in 20 s.
asked by hy 
physicccs!
A paraglider is flying horizontally at a constant speed. Assume that only two forces act on it in the vertical direction, its weight and a vertical lift force exerted on its wings by the air. The lift force has a magnitude of 1900 N. For both questions,
asked by hy 
Math
Given angle theta is bigger than 0 and smaller than 360, determine two possible values of theta where each ration would be true. a) cos theta= 0.6951 b)sin theta= 0.7571
asked by Emily 
Chemistry 22
Determine if the reaction produces a precipitate. For a precipitate mark ‘a’ and if there is no precipitate mark ‘b’. 8. KOH(aq) + Fe(NO3)3(aq) 9. MgCl2(aq) + Na(NO3)2(aq) 10. NaBr(aq) + Ag(NO3) (aq) 11. Na3PO4(aq) + Ba(NO3) 2(aq)
asked by Ivy 
Physics
The blades of a ceiling fan have a radius of 0.399 m and are rotating about a fixed axis with an angular velocity of +1.65 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 2.08 rad/s2. After 0.520
asked by Josh 
Physics  Dynamics in two dimensions
A sharpshooter shoots the bullet horizontally over level ground with a velocity of 300m/s. At the instant that the bullet leaves the barrel, its empty shell casing falls vertically and strikes the ground with a vertical velocity of 5m/s. How far does the
asked by Farah 
physics
A jet plane is flying with a constant speed along a straight line, at an angle of 25.0° above the horizontal, as Figure 4.30a indicates. The plane has weight whose magnitude is 86500 N, and its engines provide a forward thrust of 103000 N. In addition,
asked by anonymous 
physics
A 3.26 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 10.4 N at an angle theta = 29.0° above the horizontal. The coefficient of kinetic friction between the block and the floor is 0.10. What is the speed of the block
asked by helena 
statistic
Quiz has 6 questions. Each question has five possible answers, only one of each 5 answers is correct. If student randomly guesses on all six questions, what is the probability to answer 2 questions right? Tip: first, you have to define parameters of
asked by tanya 
chemistry
what will be the pH change when 20 mL of .1M NaOH is added to 80 mL of a buffer solution consisting of .164M NH3 and .187M NH4Cl? Pka 9.25
asked by anonymous 
Chemistry
Caluclate the delta H for this reaction using standard enthalpies of formation. (The standard enthalpy of formation of liquid pentane is 146.8kJ/mol. Balanced equation balanced equation: C5H12(l)+8O2(g)>5CO2+6H2O(g) CO2=393.5 H2O=40.7
asked by Ashley 
Physics  Collision in teo dimensions(check + help
Car A, with mass of 1735kg, was traveling north at 45.5km/h and car B, with a mass of 2540kg, was traveling west at 37.7km/h when they collided at an intersection. if the cars stuck together after the collision, what was their combined momentum? Was the
asked by Farah 
physics
Find the rotational kinetic energy of the earth about the sun due to its orbit about the sun. The mass of the earth M is 6 x 1024 kg, the orbital radius r is 1.5 x 1011 m and the rotational period T is 1 year. Treat the earth as a point mass in this
asked by Maa 
Physics
How do you find the resultant in terms of components, the magnitude of the resultant, and the resulant's angle above the xaxis?
asked by Anonymous 
physics
Two blocks of mass m1 = 1.0 kg and m2 = 2.5 kg are connected by a massless string. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.40. Calculate the speed of the blocks after they have moved a
asked by lucy 
physics
A venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at a speed v2 through a horizontal section of pipe whose crosssectional area A2 = 0.0600 m2. The gas has a density of ñ = 1.30 kg/m3. The
asked by student 
math
How many different pizzas can be made with 5 topping to chose from?
asked by dillard 
Informal Logic
Sometimes people get caught in a “downward spiral,” a case in which something leads to a result which in turn leads to more of the original thing, bringing on more of the result. As the process continues, the result continually gets worse and worse. An
asked by Anthony 
chemistry
Given the following reaction: Pd(NO3)2+CaSO4>PdSO4+Ca(NO3)2 If you started with 225.6ml of 6.32M CaSO4 and the percent yield of this reaction was ol 78.2%, what is the actual yield of grams mod of PdSO4?
asked by regina 
physics
A 6.00 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=14.1 N at an angle θ= 19.0° above the horizontal, as shown. What is the speed of the block 3.50 seconds after it starts moving?
asked by jamie 
physics
Two blocks of mass m1 = 1.0 kg and m2 = 2.5 kg are connected by a massless string.M1 is on the surface and mass 2 is hanging on the surface. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.40.
asked by sky 
physics
Two blocks are arranged. M1 is on the table and m2 is hanging from the pulley. The pulley can be considered to be massless, and friction is negligible. M1 is four times more massive than M2. If the system is released from rest, how far will M1 travel in
asked by helena 
Chmistry
For the following reaction, 4.35 grams of hydrogen gas are allowed to react with with 10.3 grams of ethylene (C2H4). hydrogen (g) + ethylene (C2H4) (g) ethane (C2H6) (g) What is the maximum amount of ethane (C2H6) that can be formed? grams What is the
asked by Austin Jekins 
physics
A 3.26 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 10.4 N at an angle theta = 29.0° above the horizontal. The coefficient of kinetic friction between the block and the floor is 0.10. What is the speed of the block
asked by lucy 
physics
The drawing shows a hydraulic chamber in which a spring (spring constant = 1292 N/m) is attached to the input piston, and a rock of mass 24.7 kg rests on the output plunger. The piston and plunger are at the same height, and each has a negligible mass. By
asked by josh 
Critical Numbers
Find the critical numbers of the function on the interval 0 ≤ θ < 2π. f(θ) = 2cos(θ) + (sin(θ))^2
asked by Michael 
Physics
In one cycle a heat engine absorbs 530 J from a hightemperature reservoir and expels 310 J to a lowtemperature reservoir. If the efficiency of this engine is 55% of the efficiency of a Carnot engine, what is the ratio of the low temperature to the high
asked by Stefan 
physics
A 6.00 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=14.1 N at an angle θ= 19.0° above the horizontal, as shown. What is the speed of the block 3.50 seconds after it starts moving?
asked by lucy 
Chemistry
The gramformula mass of NO2 is defined as the mass of one mole of a. one mole of NO2 b. one molecule of NO2 c. two moles of NO d. two molecules of NO Explain why.
asked by danny123 
Physics  conservative and non conservative (check
If a sled reaches the base of the hill with a speed of 15.6m/s, how much work was done by the snow on the sled between points x and y, where x is 3m above the ground with a velocity of 14.30m/s and y is toughing the ground. the sled and the rider are 70kg
asked by Farah 
College ChemistryPlease
*Only need input not doing it for me. PLEASE QUESTION: Some hydrocarbon fuels have sulfur present and contribute to air pollution. When this solid sulfur is burned in the presence of oxygen, the noxious, toxic gas sulfur dioxide results. If there is .50
asked by Sue 
chemistry
Find the percent by mass of sodium chloride in a 1.35 M NaCl solution. The density of the solution is 1.06 g/mL..............how do I go about doing this question thanks!
asked by Stacy 
Business Finance
Your firm is contemplating the purchase of a new $869,500 computerbased order entry system. The system will be depreciated straightline to zero over its 5year life. It will be worth $84,600 at the end of that time. You will be able to reduce working
asked by Leigh 
phy
An 90 kg person steps into a car of mass 2600 kg, causing it to sink 2.35 cm on its springs. Assuming no damping, with what frequency will the car and passenger vibrate on the springs?
asked by klk 
Precalc
Find the standard form of the equation of the hyperbola with the given characteristics. foci: (±4, 0) asymptotes: y= +/ 3x
asked by lllll 
Chemistry
What is the lewis structure for Propanoic Acid?
asked by Eddie 
physics
A person pulls a toboggan for a distance of 30.0 m along the snow with a rope directed 20.0° above the snow. The tension in the rope is 85.0 N. (a) How much work is done on the toboggan by the tension force?
asked by Anonymous 
Chemistry
How many grams of BaSO4 can dissolve in 1.5 L of a 0.010 M solution of Na2SO4? Ksp= 1.1 x 10^10 I thought the answer was 1.1x10^8 M then multiply by the molar mass to get the amount of grams but my answer isn't correct. PLEASE HELP!
asked by Maddie 
Chemistry
Calculate the enthalpy change per gram for the combustion of ethane (C2H6(g)).
asked by Billy 
Physics
A car is driven 145 km west and then 65 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?
asked by Anonymous 
chemistry
If you collect hydrogen gas over water at a temperature of 45 degrees celcius, what is the volume of jst te hydrogen if the pressure of hydrogen is 1.23 atm and the grams of hydrogen was 2.6? What is the volume of the water?
asked by regina 
Physics  Collision in one dimension
The mass of a uranium238 atom is 3.95*10^25kg. A stationary uranium atom emits an alpha particle with a mass of 6.64*10^27kg. If the alpha particle has a velocity of 1.42*10^4m/s, what is the recoil velocity of the uranium atom. Ans: i tried MaV'a =
asked by Farah 
physics
Two blocks are arranged. The pulley can be considered to be massless, and friction is negligible. M1 is four times more massive than M2. (m1 is on the table and m2 is hanging from the pulley). If the system is released from rest, how far will M1 travel in
asked by jamie 
Chmistry
For the following reaction, 4.35 grams of hydrogen gas are allowed to react with with 10.3 grams of ethylene (C2H4). hydrogen (g) + ethylene (C2H4) (g) ethane (C2H6) (g) What is the maximum amount of ethane (C2H6) that can be formed? grams What is the
asked by Austin Jekins 
chemistry
oxalic acid, h2c2o4, is a weak acid capable of providing two H3O+ ions. ka=.059 k2=6.4E5 the [h3o]+ in a .38 M solution of h2c2o4 is .12M and can be calculated by the first ionization step only. what is the equilibrium concentration of the oxalate ion
asked by anonymous 
physics
A set of crash tests consists of running a test car moving at a speed of 11.6 m/s (25.5 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 61.0 kg (134.2 lbs) dummy is found to move a distance of 0.750 m from the moment the car
asked by jamie 
physics
A large wooden wheel of radius R and the moment of inertia I is mounted on an axle so as to rotate freely. A bullet of mass m and speed v is shot tangential to the wheel and strike its edge, lodging in the wheel’s rim. If the wheel was originally at
asked by Gee 
Business Communications
Choose the best revision of this sentence: "I want an interview with you." (Points: 5) I anxiously await a phone call from you so that we can meet to discuss job opportunities. I can't wait to hear from you. Any time at all that you want to call and have
asked by lisa 
Physics
During an acceleration, the angular speed of an engine increases from 900 rpm to 2800 rpm in 4.5 s. What is the average angular acceleration of the engine?
asked by Sandi 
Physics
I got part a but I'm having trouble figuring out b... I know the formula should be something like: T=2pi/omega and omega=sqrt(k/m) but how am I supposed to find T when I don't know k or m?? A pendulum has a period of 2.4 s. a) What is its length? l = m *
asked by Anonymous 
Precalc
Find the center and vertices of the ellipse. 4x^2 + 16y^2  64x  32y + 208 = 0
asked by pat 
physics
Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and We = 1.157 x 105 rev/sec.
asked by qay 
physics
A constant torque of 20 N.m is applied to a wheel pivoted on a fixed axis. At what rate is power being furnished to the wheel when it is rotating at 0.5 rev/sec?
asked by Maa 
com155
Write five sentences about the role of education in successful financial planning, in which you correctly use a different verb tense in each sentence. Mark each verb used in bold and, in parentheses, identify the specific tense used. THIS IS WHAT I WROTE:
asked by dan 
physics
Two identical containers are open at the top and are connected at the bottom via a tube of negligible volume and a valve which is closed. Both containers are filled initially to the same height of 1.00 m, one with water, the other with mercury, as the
asked by joseph 
AP Physics
A ladder of unknown length and mass of 29 kg rests on a rough floor, and leans against a rough wall. The coefficient of static friction between the ladder and both the floor and wall are 0.68. Hanging on the ladder are two masses. The first mass is 9.9 kg
asked by Mary 
physics
At 10:15 am snail 1 crossed the 65 cm mark with a velocity of 4cm/min. In a great burst of energy, Snail 1 raced to the 90 cm mark in 3 minutes. His velocity as he crossed the 90 cm mark was 7cm/min. What was the acceleration of Snail 1?
asked by Ashley 
chemistry
What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)> ZnCl2(aq) + Cu(s) Please Explain!! Thanks!!
asked by Jenni 
physics
A cable is lifting a construction worker and a crate The weights of the worker and crate are 915 and 1430 N, respectively. The acceleration of the cable is 0.620 m/s2, upward. what is the tension in the cable below the worker? what is it above the worker?
asked by hy 
phyics
A jet plane is flying with a constant speed along a straight line, at an angle of 25.0° above the horizontal, as Figure 4.30a indicates. The plane has weight whose magnitude is 86500 N, and its engines provide a forward thrust of 103000 N. In addition,
asked by angela 
statistics  math
Sixty percent of the students at a particular community college are female. If 13 students at that community college are selected at random, find the probability that 5 or 6 students will be female. Use Appendix Table or Excel function for Binomial
asked by tanya 
Chemistry
Need Help On This Question.! Potassium chloride reacts with bromine forming potassium bromide plus chlorine. If 500g of potassium bromide are produced, how many grams of potassium chloride reacted?
asked by Jacky 
physics
Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and ùE = 1.157 x 105 rev/sec.
asked by Qay 
Chemistry
16.7 grams of chlorine gas are allowed to react with with 3.31 grams of water What is the maximum amount of hydrochloric acid that can be formed in grams
asked by Austin Jekins 
Chemistry 22
A 19.18 mL of 0.125 M Oxalic Acid (H2C2O42H2O) is titrated with a Ca (OH)2 solution. The initial volume of Ca(OH)2 was 14.38 and the final volume of Ca(OH)2 was 28.29 mL when the solution turned very slightly pink. What is the concentration of Ca (OH)2?
asked by Ivy 
chemistry
Given the following chemical reaction: Zn+HCl>ZnCl2+H2(g) If you measured the total volume of collected gas over water at 20 degrees celcius t be 428ml at a total pressure of 845 torr, how many milliliters of 2.6M HCl would be required to produce the
asked by regina 
geology
if the air temperature @ sea level were 23 C what would the air temperature be at a height of 2 km under avg conditions?
asked by lisa 
Chemistry  double replacement +balancing equation
CuSO4 + Na2CO3 I don't know how to do this :( somebody help me :( i think its CuSO4 + Na2CO3 Cu3(CO3)2 + Na2SO4 I have no idea how to balance this. Heelllppp
asked by Marie 
physics
A full can of black cherry soda has a mass of 0.406 kg. It contains 3.38 104 m3 of liquid. Assuming that the soda has the same density as water, find the volume of aluminum used to make the can.
asked by amanda 
Math
The shorter leg of a right triangle is 14 feet shorter than the longer leg. The hypotenuse is 26 feet. How long is each leg?
asked by Megan 
Physics
A ball is attached by two springs as shown in the left figure( wwOww ).If the mass is displaced a distance âŠ¿x below the equilibrium position h. Determine whether vertical SHM is possible for the system shown. If so, find the natural frequency.
asked by Marco Tsang 
math  statistics
Football team makes in average 2 touchdowns per game. Use Poisson distribution to find probability that this team will make 5 touchdowns in the next 3 games (adjust ë) Tip: use Poisson Appendix Table or Excel function Poisson(x, ë, false) for x=5 and ë
asked by tanya 
physics
The airplane can take off when its airspeed (speed of the air flowing over the wing) is equal to 65 knots. What is the length of runway required for the plane to take off if there is a 21 knots head wind? The runway at the Tallahassee Regional Airport has
asked by Brittany 
physics
This refers to passive solar collector, where solar radiation is used to heat water. It is therefore not on the solar cells. What characteristics should solar collectors have, to function in an optimal way? Why should these properties be fulfilled? If
asked by bark 
Physics
#1.) A solar photovoltaic panel has an area of 3 m^2. The panel's maximum power output is 595 W @ 1100 W/m^2. a) What is its efficiency? b) If the panel receives 1300 W/m^2 of irradiance, what is its new power output? #2.) A solar voltaic module has a
asked by Joe 
physics help
A cylindrical air duct in an air conditioning system has a length of 3.5 m and a radius of 5.00 102 m. A fan forces air (ç = 1.8 1 x05 Pa·s) through the duct, such that the air in a room (volume = 242 m3) is replenished every 12 minutes. Determine the
asked by peter 
College physicsoscillations
A ball is attached by two spring as shown [vvvOvvv]. If the mass is displaced a distance â–³x BELOW the equilibrium position h (see figure A). Determine whether vertical SHM is possible for the system shown.If so, find the natural frequency. [Assume
asked by Marco 
science
which substace's solubility changes the most from 0 degrees celsius to 100 degrees celsius
asked by renee 
Chemistry
An unknown metal, heated to an unknown temperature until a liquid is dropped into a calorimeter that has 250 ml of water. The water heats up from 22 degrees Celcius to 29 degrees Celcius, at which point the temperature of the water and metal are equal. How
asked by Ivy 
Chemistry 22
Your length measurement was 21.34 cm. The ‘accepted value’ was 21.77 cm. What is the percent error of your measurement?
asked by Ivy 
english
I have essay exam on martin luther king definition of justice in letter from birmingham jail and need help with this. The letter uses big vocabs and its very complicated to understand its claim, evedience etc.Please help understand this letter so I can
asked by Mary 
algebra
find the present value for $2000 if interest is 3.5% compounded quarterly for 6 years?
asked by kathy 
chemistry
consider the reaction in which 410g of Ca(NO3)2 react with just the right amount of lithium metal in a single replacement reaction ?
asked by obi 
chemistry
The new vapor pressure of a solution of 3.25g of an unknown compound in 22.35g of H2O is 114.9mmHg at 55 degrees Celcius. What is the molar mass of the unknown compound?
asked by regina 
chemistry
How many photons of frequency 2.7*10^14 Hertz would be needed to light a 60 Watt light bulb for 1hr?
asked by regina 
biology
a fruit is most commonly _______? A. modified root B. a mature female gametophyte c. mature ovary d. a thickened style e. enlarged ovule
asked by milly 
MATH HELP!!!
Gail spent 3/10 of her day at school, and 3/9 of her day sleeping. About how much of her day is left? A:about 7/10 B:about 1/3 C:about 1/5 D:about 4/10 My answer: I am stuck choosing between 4/10 or 1/3.
asked by Arushi 
algebra 1
Determine which real number corresponds to the situation. The record low temperture for a date is 25.6 degrees below zero. The corresponding number for this sentence is.
asked by robbie 
physics
What is the longest wavelength for standing sound waves in a 102.0 cm long tube that is open at both ends?
asked by Josh 
Microeconomics
Are monopolies evil? who regulates most monopolies? Are those regulators evil?
asked by joey 
Chemistry
What is the empirical formula of a compound that has a carbontohydrogen ratio of 2 to 6? Is it CH3?
asked by danny123 
Physics  electric field intesity (check +help)
Points A and B are 13.0 apart. A charge of +8.0mu is placed at A and another charge at +5.0mu is placed at B. Point P i located 5.0cm from A and 12.0cm from B. What is the magnitude and direction of the electric field intensity at P? Ans: i got the
asked by Farah 
physics
The single cable supporting an unoccupied elevator breaks when the elevator is at rest at the top of a 155 m high building. With what speed does the elevator hit the ground?
asked by Brittany 
Math070
Is (x3)(3x+6) factored out completely? Also will a trinomial always factor as the product of two binomials.
asked by Keenan 
CHEM
HOW MANY GRAMS OF SALT ARE REQUIRED TO PREPARE 300 G OF 15% SALT SOLUTION? HOW MANY GRAMS OF WATER ARE NEEDED?
asked by Anonymous 
physics
A solid sphere of radius 3 cm and mass of 100 g rolls down a 30 degree incline from a height of 1 m. A hoop of the same mass and radius rolls down the same incline from the same height. What is the linear velocity of each body at the bottom of the incline?
asked by Qay 
Applied Reseach
For my research paper I wrote about the affects of music on standardized test scores. Basically I tracked scores of elementary and middle schoolers. I compared those who participate in music and those who didn't (quantitative research). Then i wrote a
asked by Jonathan 
statistics
A large number of samples of size ‘n’ are selected from a population and the mean of each sample is determined. What can be said about the mean of the sample means
asked by Angel 
business
I need to know the web site for information on the UCITA and UCC.
asked by TONJA 
math
the lengths of the sides of four triangles are listed as follows. which two triangles are similar? explain. a~ 5 cm, 6 cm, 8 cm b~ 6 cm, 7 cm, 8 cm c~ 8 cm, 10 cm, 12 cm d~ 12 cm, 15 cm, 18 cm
asked by Anonymous 
physics
Two blocks with mass m1 = 4.2 kg and m2 = 4.7 kg are connected by a massless string over a frictionless and massless pulley. The angle of the incline is equal to 27.5°. The kinetic coefficient of friction between m1 and the incline is 0.28. What is the
asked by sky 
Business Communications
Which of the following is the BEST advice for increasing the number of "hits" on a scannable résumé? (Points: 5) Avoid jargon of any sort. Use a Keywords section under your name, address, and phone. Use more verbs than nouns. Use only one page. I think B
asked by lisa 
phy
2 kg of water at 5 celsius is added to ice at 0 celsius. The ice and water make up a closed system. Calculate how much of the ice melts
asked by brandy 
MATH
Which statement is true about a triangular prism? a. It has exactly 1 pair of parallel faces b. It has not parallel edges c.It has atleast 2 pairs of parallel faces d.It has no parallel faces
asked by Debbi 
physics
two particles of mass m1 and m2 are joined by a massless spring of spring constant k and natural length L.Initially m2 is on table and m1 is above m2 at a vertical height h.At t=0 m1 moves with velocity v0.find the position of the masses
asked by Anonymous 
11th grade
what is the velocity of a boat traveling 60 km in 2 hours?
asked by Taylor 
chem 122
2H2+O2=H=121k?1molH2O how many grams of hydrogen are needed to produce 1.20x10power3 Kj of heat?
asked by franko 
Physics
I need help with b... I found that k=.750880 for part a but I can't figure out what y would be to get potential energy. A 52 g mass is attached to a massless spring and allowed to oscillate around an equilibrium according to: y(t) = 0.8 * sin( 3.8 * t )
asked by Anonymous 
physics
A solid sphere of radius 3 cm and mass of 100 g rolls down a 30 degree incline from a height of 1 m. A hoop of the same mass and radius rolls down the same incline from the same height. What is the linear velocity of each body at the bottom of the incline?
asked by Qay 
chem
An unknown metal has a volume of 5.25 mL and a density 2.71 g/mL. What is the weight of the metal in grams?
asked by Ivy 
Physics
#1.) A solar photovoltaic panel has an area of 3 m^2. The panel's maximum power output is 595 W @ 1100 W/m^2. a) What is its efficiency? b) If the panel receives 1300 W/m^2 of irradiance, what is its new power output? #2.) A solar voltaic module has a
asked by Jim 
history
how does the history of cuba connect to the current problems it has today? i know that fidel castro came to power and established a communist ditatorship, but what was it before that? and i kinda need more info for the whole question, any websites would be
asked by Anonymous 
physivs
A certain CD has a playing time of 68 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 102 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 102 rpm. Find the magnitude of the average angular
asked by Anonymous 
english
this is the assignment can you tell me if i covered what was needed of the assignment? Write two paragraphs, with a total minimum word count of 350 words, explaining what your point of view will be and what you plan to accomplish in your paper. My point of
asked by rene 
Physics  mass of a galaxy
A star at the edge of the Andromeda galaxy appears to be orbiting the center of that galaxy at the speed of about 200km/s. The star is about g*10^9AU from the center of the galaxy. Calculate a rough estimate of the mass of the Andromeda galaxy. Earth
asked by Farah 
physics
A phonograph record of radius 6 cm and mass 15 g is rotating with an angular velocity of 33.33 rev/min. A Penny of mass 1 g suddenly falls on the record and lands at the radial distance of 4 cm from the record’s center. What is the angular velocity after
asked by Qay 
college
An essay on To what extent was president andrew jackson one of the nation'smost effective president?
asked by Ashley 
maths
find the value of (2416)*864/(102)+4
asked by ponnammal 
Statistics
Suppose that a set of test scores from a class you teach is symmetric and bellshaped. That's means that there are some scores significantly below the mean and some significantly above the mean, so that it would be inappropriate to "give everyone an 'A',"
asked by Al 
physics
What is the longest wavelength for a standing wave, in the same length tube, that is open at one end and closed at the other?
asked by jaxson 
science
My science teacher gave me a site to go to and it would do the references for me. But I forgot the site. I remember that it Had APA, Print and non print. Can someone please help me with the site address? Thank you so Much!
asked by Luna 
Chemistry
I am doing a report on ethylene glycol, AKA antifreeze, and I need to figure out if it is naturally occurring or if it is manmade. I can't seem to find this answer anywhere! Please help!
asked by Julie 
com155
Write five sentences about the role of education in successful financial planning, in which you correctly use a different verb tense in each sentence. Mark each verb used in bold and, in parentheses, identify the specific tense used The role of education
asked by dan 
Chemistry
One other question that I cannot figure out what I'm doing wrong is this.. If .002 L of .650 M NaOH are added to 1.0 L of 0.9 M CaCl2 what is the Q value? I keep getting 0.0011 because I thought the answer was [Cu+][OH] but that's not correct
asked by Maddie 
english
Hi I really would appreciate your help.I am freshman in college and I want to be "Women's health nurse pracitioner". However, English is not my native language and even though this is exactly what I am interested in I am doubting my performance in labs. I
asked by Lola 
statistic
the mean of adult men is 172 pounds with a standard deviation of 29 pounds. ask 20 men thier weight and use excel to calculate the mean. test the hypothesis that the mean is not 172 pounds at the .10 significance level. and how many men should be sampled
asked by natasha 
english (Frederick Douglass)
Why do you think Douglass says of the killing of slave Demby ‘in an instant poor Demby was no more. His mangled body sank out of sight, and blood and brains marked the water where he stood.”?
asked by Tiffany 
college Chemistry
1. If 25 grams of Iron (III) hydroxide is dissolved in a 500mL volumetric flask, what is the Molarity of the solution? 2. An unknown metal has a volume of 5.25 mL and a density 2.71 g/mL. What is the weight of the metal in grams? 3. An unknown metal,
asked by Ivy 
physics/rollercoaster
how would an increase in mass inside of a rollercoaster affect the sturdiness of the coaster
asked by Kay 
algebra 2
What is 6y^233y63?
asked by Jaleese 
physics
A mobile is constructed from a thin rod of mass 50 g and length 50 cm. Two hanging masses are positioned at each end of the rod. The mass of one of the hanging masses is 100 g. What must be the mass of the other hanging mass so that the mobile is in static
asked by Qay 
college
To what extent was president andrew jackson one of the nation'smost effective president?
asked by Anonymous 
biology
Produce a family tree for at least three generations of your family or a friend's family following these genetic traits: Eye color Hair color
asked by Anonymous 
social studies
How did imperialism lead Germany into World War I? thanks for help !
asked by Anonymous 
Department of Health and Human Services
WHAt do you think of hhs
asked by Anonymous 
US History
the earliest large cities were located on waterfronts. How might new changes in transportation affect the location of cities ?
asked by Bread 
marketing planning
Define and comment on the Marketing Concept. Outline and comment on the role of marketing management within the wider context of the operation of a business enterprise as a whole unit.
asked by MariaSavva 
math
the measures of the angles of a quadrilateral are in the ratio of 1:2:3:4, find the measure of each angle
asked by Anonymous 
subtracting two digit numbers
bathany has 40 apples write a subtraction story about apples that would require regrouping
asked by khalid 
earth
the earth has a limited amount of water true or false
asked by melpo 
physics
One of two 207.0 kg crates is dragged across the floor at a constant speed with a horizontal force of 197.0 N. How much force would it take to drag them both across the floor if they are tied together one behind the other? How much force would it take to
asked by sky 
Math
Fill in the blank so that the given statement is true. The median is 77 65,68,78,82,89,__
asked by Debbi 
Business Communications
The interviewer wants to know why you got a "D" in all your English classes until this year, when you got a "B." Your best response is: (Points: 5) “I had problems writing and never thought it was important. Then, I realized that it is important, so I
asked by lisa 
122
i need help pls to understand bohrs model
asked by franko 
english
question How would you think a writer would hope to see themselves as a writer in the future? What should they still need to learn to strenghten it to make it better?
asked by kate 
physics
A mobile is constructed from a thin rod of mass 50 g and length 50 cm. Two hanging masses are positioned at each end of the rod. The mass of one of the hanging masses is 100 g. What must be the mass of the other hanging mass so that the mobile is in static
asked by Qay 
Microeconomics
same question about the are monopolies evil?....i wanted to know if the regulators are evil?
asked by joey 
Math
(x+5)(x3)=9 I am not sure how to work this out?
asked by Keenan 
math
a country has 221 mobile cellular telephones per 250 inhabitants. if the country's population is about 2,800 how many mobile cellular telephones does the country have? in your own words, using complete sentences solve the problem
asked by shannon 
calculus
A line in the first quadrant is tangent to the graph of y=1/x^2. How can we minimize the area between the line and the axes?
asked by Susan 
polymer science
how can we get copolymer from polymer give the reaction condition and how can its possible and the equation for the copolymerization.
asked by pradee 
Social Studies
What articles would you recommend for a project where I must connect politics in europe to the world?
asked by Christopher 
chemistry
If you hit the surface of Copper with a photon of energy and find that the ejected electron has a wavelengt of .8nm what is the frequency of the incoming photon?
asked by regina 
chemistry
Using the ionization energy chart, how much energy will it take to remove only 1 electron on the surface of Nickel? If you hit the surface of Nickel with a photo that has a wavelength of 90nm, what will the wavelength of that ejected electron be?
asked by regina 
6th grade
what is the metalloids of shininess
asked by destiny 
Chemistry
what is a common physical property of ester?
asked by Vivian 
PHL/323
roles of key players, ethical issues involved fo the scott paper company
asked by bobbi 
classe to learn english
i have a home woork i w'ant to writhe evrething abaout the CLOOK the big hand ,the little hand ?
asked by charelle 
social studies
Why did Germany want to become an empire ?
asked by Anonymous 
law & ehtics
I,m doing aresearch paper and i have to answer questions. Do i write the question in my paper or do i just put them in my intro? the question has number so do i put them in there too?
asked by shirkira 
algebra 1
what is the solution for this equation 9/16  7/16 =
asked by robbie 
algebra 1
can you help with this one 7  (2)=
asked by robbie 
ethics
What protects whistleblowers from retaliation? What federal law or federal act stands up for them?
asked by Anonymous 
math
Multiplication of fraction 21/25*3 8/9
asked by Asia 
math
can anyone help
asked by Asia 
math
Wow there is no one is there to help here
asked by Asia 
Biology
Identfing the mixture soil and water
asked by General lab 
PhysicsI would like to ask once more!
A ball is attached by two spring as shown [vvvOvvv]. If the mass is displaced a distance â–³x BELOW the equilibrium position h (see figure A). Determine whether vertical SHM is possible for the system shown.If so, find the natural frequency. (Figure
asked by Marco Tsang 
science
Baceria are placed into two different areas . these area are??
asked by becca 
physics
One of two 207.0 kg crates is dragged across the floor at a constant speed with a horizontal force of 197.0 N. How much force would it take to drag them both across the floor if they are tied together one behind the other? How much force would it take to
asked by helena 
English
In Life of Pi, which is the true story? To me, I think the answer can go either way... Can someone help me? :S
asked by Jessica 
chemistry
For the following strong base solution 0.40 M NaOH, determine [OH] and [H30+]. thanks
asked by amy 
Discrete Math
Let a, b, c, and d be integers, and let n be a positive integer. Prove that if a is congruent to c mod n and b is congruent to d mod n, then (ab) is congruent to (cd) mod n
asked by Samantha 
discrete math
Let A= {for all m that's an element of the integers  m=3k+7 for some k that's an element of positive integers}. Prove that A is countably infiite. Note: you must define a function from Z+ to A, and then prove that the function you definied is a bijection
asked by Samantha 
math
_4y_____ _ ___3y________ y^2+6y+5 y^2+5y+4
asked by chanda 
science
Does a jellyfish reflect or refract light when it gives off light. If yes, can u please include a ray diagram
asked by Umesh 
phy
During an isovolumetric process, the pressure on the gas is doubled and the amount of gas is tripled. If the initial temperature of the gas is 300k, what is thefinal temperture.
asked by brandy 
chm122
how many kilojouels of heat are produced when 670gof oxygen react with sufficient hydrogen?
asked by franko 
college Chemistry
After subtracting the weight of the container, the Vanadium metal inside is found to weigh 8.34 grams. After reacting with Oxygen the newly formed compound weighs 21.43 grams. What is the empirical formula?
asked by Ivy 
science
what layer of the earth did the chile miners reach
asked by theresa 
science
how did the miners of chile get into the earth
asked by theresa 
science
how does the miners jobs help the earth
asked by theresa 
science
what was the chile miners looking for
asked by theresa 
Math
1.x(x3)=4 means that x=4 and x3=4 Is that right? 2.Is the sum of squares prime???
asked by Tommy 
science
how far did the chile miners enter into the earth
asked by theresa 
College physicsoscillations
A ball is attached by two spring as shown [vvvOvvv]. If the mass is displaced a distance â–³x BELOW the equilibrium position h (see figure A). Determine whether vertical SHM is possible for the system shown.If so, find the natural frequency. [Assume
asked by Marco 
Engligh 101
I need help analzying this quote. The fantastic. . . lasts only as long as a certain hesitation. . . [in deciding] whether or not what they [the reader and the protagonist] perceive derives from “reality” as it exists in the common opinion. . . If he
asked by Michelle 
english (Frederick Douglass)
Whatis the most important description of Mr. Gore?
asked by Tiffany 
algebra
how do you figure this equation step by step 4x3y=11 2x+3y=13
asked by carol 
Com 220
I need help in how do I go about incorporating statistics, graphs and iiustrations. My topic is about probation is apporiate for drug offenders
asked by Brandy 
the clook in english
i have a home woork i w'ant to writhe evrething abaout the CLOOK the big hand ,the little hand ?
asked by charelle 
adult education
Why is it essential to consider each domain when studying and discussing the theories of adult development? Provide an example of how one domain of development impacts the other two.
asked by db 
english
i need three strong reason to convince people to go bowling
asked by lakesha 
English 101
What does uncanny and marvelous mean?
asked by Jason 
English 101
What does uncanny and marvelous mean?
asked by Jason 
US History
1) Why was Ralph Abernathy a reliable source for information about the civil rights movements ? 2) How might the association with Martin Luther King Jr., have affected his point of new toward those events?
asked by Bread 
religion
According to the Cow (2nd sura of Qur’an), Muslims a) must not be the aggressor in war b) should avoid violence at all cost c) must formally declare war before attacking d) may not mistreat captives
asked by James 
math
What characteristic do the numbers 8, 10, 15, 26, and 33 have that the numbers 5, 9, 16, 18, and 24 don’t have?
asked by Anonymous