Wednesday

April 1, 2015

April 1, 2015

Number of results: 59,217

**Physics**

A lift is pulled up to the top of a building by a constant force of 6400N at a constant speed of 2m/s. It takes 3mins to reach the top. (a) how much work is done in raising the lift to the top of the building ? (b) what is the power required ?
*June 2, 2011 by Lina*

**Physics**

A box of mass m1 = 10.0 kg rests on a smooth, horizontal floor next to a box of mass m2 = 5.0kg. You push on the box 1 with a horizontal force of F = 31.8 N: a.)What net force on box 2 will cause it to have this acceleration? b.)What the force on box 1 on box 2? (In other ...
*February 20, 2011 by Brandon*

**physics**

three forces act on a ring. The net force on the ring is zero. One force is at an angle of 30 degrees with a magnitude of 40 Newtons. A second force F acts at an angle theta . The tangent of the angle is tan theta = 3 / 3 . If the third force is n3 Newtons, what is n3?
*January 12, 2012 by frank*

**Power generation**

need help 2. Large central power stations typically have a power output capacity of 1000 MW and convert about 35 percent of the input energy to electricity. Consider such a plant that burns coal with an energy content of 24 MJ/kg. 1. How much coal (tons) is required by this ...
*July 10, 2011 by paul smith*

**Algebra**

Help please! I got so far with this and stopped because of confusion. Here is what I have so far. Let f(x) = 6/x-1 and g(x) = 1 + 3/x find the composite function of (fog)(x) (fog)(x) = f (g(x)) =f (1+3/x) =6/x-1 ????
*June 24, 2009 by Rachale*

**Finding distances**

Person is 1.8 meters tall standing far away at angular height of 5 meters. How do I find how far way they are
*February 2, 2012 by Carol*

**Finding distances**

Person is 1.8 meters tall standing far away at angular height of 5 meters. How do I find how far way they are
*February 2, 2012 by Carol*

**physics**

It is important to be as far away from the cliff as possible before opening the parachute. How far from the cliff is this jumper when she opens her chute?
*October 11, 2013 by jessie*

**calculus**

Could someone help me draw these vectors? These things confuse me. A force of 42 newtons acting on an object at an angle of 53 degrees with the ground A force of 342 lbs. acting on an object while a force of 454 pounds acts on the same object an angle of 94 degrees with the ...
*February 21, 2010 by Jim*

**Physics**

An airtight box, having a lid of area 12 in2, is partially evacuated. Atmospheric pressure is 15 lb/in2. A force of 108 lb is required to pull the lid off the box. The pressure in the box was:
*December 16, 2010 by Sammy*

**Physics**

An airtight box, having a lid of area 12 in2, is partially evacuated. Atmospheric pressure is 15 lb/in2. A force of 108 lb is required to pull the lid off the box. The pressure in the box was:
*December 16, 2010 by Ken*

**math**

ronnie swam 2.5 laps on monday and swam twice as far on tuesday how far did he swim in all?
*April 23, 2013 by erica*

**Physics**

A bridge that was 5.0m long has been washed out by the rain several days ago. How fast must a car be going to successfully jump the stream? Although the road is level on both sides of the bridge, the road on the far side is 2.0m lower than the road on this side.
*October 19, 2008 by Joyce*

**chemistry**

Calculate the cell potential for the following reaction as written at 51 degrees C, given that [Zn2+] = 0.837 M and [Sn2+] = 0.0180 M. Zn(s) + Sn^2+(aq) = Zn^2+(aq)+Sn(s) E = __ V Reduction Half-Reaction Standard Potential Ered (V) Zn2+(aq) + 2e → Zn(s) 0.76 Sn2+(aq...
*June 7, 2012 by Katherine*

**physics**

The driver of a 1024 kg truck traveling 32.6 m/s North on I-77 has to make a sudden stop. If it requires a distance of 57.1 m for the truck to stop, use conservation of energy to find the net force acting on the truck.
*November 18, 2009 by Cory*

**physics**

The driver of a 1024 kg truck traveling 32.6 m/s North on I-77 has to make a sudden stop. If it requires a distance of 57.1 m for the truck to stop, use conservation of energy to find the net force acting on the truck.
*December 9, 2009 by Sandy*

**Chemistry**

A galvanic cell consists of La^3+/La half-cell and a standard hydrogen electrode. If the La^3+/La half cell functions as the anode and the cell potential is 2.52 V, what is the reduction potential for the La^3+/La half cell? the choices are -2.52V,-0.84V, +0.84V,+2.52V
*March 9, 2010 by Anonymous*

**Dynamics**

The man slides the 100-kg crate across force of 200 N. If the crate was initially at rest, how far will the crate move before its speed is 1 m/s? The coefficient of kinetic friction between the crate and the floor is 0.18. The man is pulling the crate at a 20 degree angle.
*March 17, 2014 by Ivan*

**Physics**

A horizontal force of 3,000,000 dynes can keep a 50 kg mass in uniform motion. What is the coefficient of the kinetic friction? At what angle must the plane be tilted to allow the mass to slide?
*September 26, 2014 by Ked*

**physics**

three forces act on a ring. The net force on the ring is zero. One force is at an angle of 30 degrees with a magnitude of n1 Newtons. A second force F acts at an angle theta . The tangent of the angle is tan theta = 3 / 1.73 . If the third force is n3 Newtons, what is n3? look...
*January 12, 2012 by frank*

**College Physics**

Sirius is about 9.0 light-years from Earth. To reach the star by spaceship in 10 years (ship time), how fast must you travel? How long would the trip take according to an Earth-based observer? How far is the trip according to you?
*April 25, 2010 by Lanise*

**colleg physics**

Sirius is about 9.0 light-years from Earth. To reach the star by spaceship in 10 years (ship time), how fast must you travel? How long would the trip take according to an Earth-based observer? How far is the trip according to you?
*April 30, 2010 by Lanise*

**college physics**

Sirius is about 9.0 light-years from Earth. To reach the star by spaceship in 10 years (ship time), how fast must you travel? How long would the trip take according to an Earth-based observer? How far is the trip according to you?
*April 30, 2010 by Lanise*

**physics**

e4) a rope applies a horizontal force of 190 N to pull a crate a distance of 2 m across the floor. A frictional force of 50N opposes this motion a) what is the work done by the force applied by the rope? b)what is the work done by the frictional force? c)what is the total work...
*February 12, 2012 by Anonymous*

**Physics**

A rope applies a horizontal force of 208 N to pull a crate a distance of 1.91 m across the floor. A frictional force of 154 N opposes this motion. (a) What is the work done by the force applied by the rope? (b) What is the work done by the frictional force? What is the total ...
*July 2, 2014 by Anonymous*

**physics**

A cart being pulled by a 10 year old Boy with a force that is parallel to the surface. if the surface is inclined at 50 and the cart is 250kg while the surface has a coefficient of friction of 0.22 find the Normal force, Force of Friction and Force exerted by the boy
*July 27, 2014 by Lu*

**Physics**

A football is thrown with an initial upward velocity component of 15.0 m/s and a horizontal velocity component of 18.0 m/s The time required for the football to reach the highest point in its trajectory is 1.53s. It gets 11.5m above the ground. How much time after it is thrown...
*October 17, 2010 by Mattie*

**PHYSICS**

A football is thrown with an initial upward velocity component of 15.0 m/s and a horizontal velocity component of 18.0 m/s The time required for the football to reach the highest point in its trajectory is 1.53s. It gets 11.5m above the ground. How much time after it is thrown...
*October 17, 2010 by Mattie*

**Physics**

By what factor would you have to decrease the tension in a stretched string in order to decrease the wave speed by a factor of 3.5? I know that v = sqrt(T/u) but am confused as to what to do?
*January 11, 2010 by Zoe*

**Statistics**

Individuals who have a certain gene have a 0.50 probability of contracting a certain disease. Suppose that 1,940 individuals with the gene participate in a lifetime study. What is the standard deviation of the number of people who eventually contract the disease? Round your ...
*June 2, 2013 by Sarah*

**Chemistry**

Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide,H2O2, can be titrated against a solution of potassium permanganate, KMnO4. The following equation represents the reaction: 2KMnO4(aq)+...
*October 3, 2010 by Ellen*

**Math**

We're learning something about transformations on the exponents of a function. For exmaple 2^x becomes 2^4(x-2)+2. Would this mean that the 2^x graph stretched vertically by a factor of 4, moved two units to the right and 2 units downwards?
*June 19, 2009 by Lena*

**math**

Because of the wind, a boat sails 4 728 meters in the directions S 47 degrees 29 minutes W. How far south has it gone? How far west has it gone?
*August 1, 2012 by Sasuke*

**physics**

When a wire of length 5m and radius 0.5mm is stretched by a load of 49N,the elongation produced in wire is 0.1cm. Find the energh stored per unit volume of the wire.
*June 2, 2013 by Pritam*

**Chemistry**

Explain what happens when you add sodium chloride to boiling water. I know that when sodium chloride is added to water, the boiling point of water increases. What happens when it is added to already boiling water? I know it increases the temperature, I just don't know why... I...
*January 31, 2007 by Mercedes*

**7th grade math**

Can you check these? 1. Jonelle is running on a track that is 2/3 of a mile long. So far she has run 4/5 of the way around the whole trace. How far has she run so far? Ans: (2/3)(4/5) =8/15 mile 2. A recipe for muffins needs 3/4 of a cup of milk. You are making 1/2 of the ...
*March 25, 2015 by Alexis*

**sci**

You are a board member of your Home Owners Association. At your next meeting, your goal is to educate other homeowners about energy conservation. Review the following Energy Resource Plan outline: Introduction: Provide information about why conserving energy is important. ...
*February 7, 2010 by Anonymous*

**Physics(Stress & Strain)**

1) Calculate the tensile stress in a 33.000mm diameter rod subjected to a pull of 30.000kN. ANS= MPa (Round to 3 decimal places) Diameter = 33.000mm = 0.033m 30.000kN = 30000N Area = pi*d^2/4 = 3.1416 * 0.033^2/ 4 = 3.1416 *0.001089/ 4 = 0.0034212024/ 4 = 8.553006*10^-4 = 0....
*June 28, 2013 by Danny*

**Pyhsics(Stress&Strain)**

1) Calculate the tensile stress in a 33.000mm diameter rod subjected to a pull of 30.000kN. ANS= MPa (Round to 3 decimal places) Diameter = 33.000mm = 0.033m 30.000kN = 30000N Area = pi*d^2/4 = 3.1416 * 0.033^2/ 4 = 3.1416 *0.001089/ 4 = 0.0034212024/ 4 = 8.553006*10^-4 = 0....
*June 29, 2013 by Danny*

**Physics**

In Oersted's experiment, suppose that the compass was 0.30 m from the current-carrying wire. If a magnetic field of 1/3 the Earth's magnetic field of 5 10−5 T was required to give a noticeable deflection of the compass needle, what current must the wire have carried? I ...
*March 24, 2013 by Valerie*

**Physics**

When chasing a hare along a flat stretch of ground, a greyhound leaps into the air at a speed of 11.3 m/s, at an angle of 28 above the horizontal. (a) What is the range of his leap? (b) For how much time is he in the air?
*September 3, 2007 by Student*

**physics**

A car travels along a straight stretch of road. It proceeds for 14 mi at 50 mi/h, then 28.3 mi at 48 mi/h, and finally 37.4 mi at 38.3 mi/h. What is the cars average velocity during the entire trip? Answer in units of mi/h Can u show me the steps to this problem.
*September 26, 2011 by anon*

**physics**

When chasing a hare along a flat stretch of ground, a greyhound leaps into the air at a speed of 10.2 m/s, at an angle of 16.3 above the horizontal. (a) What is the range of his leap? (b) For how much time is he in the air?
*June 10, 2012 by bob*

**science**

objects of different masses are suspended from a height. which combination of features will have the greatest gravitational potential energy low mass low height low mass high height high mass high height high mass low height
*May 23, 2011 by Anonymous*

**Biomechanics**

If the volume of a material is conserved under loading (Volume without force = Volume with force) what is the materials Poissons ratio? You can assume that the material is isotropic (it will behave the same in every direction). Hint: take a cube and increase the length in ...
*October 14, 2012 by Aaron*

**Math**

I am lost, need to know how to do these types of problems. How many one-to-one correspondences are there between the sets {a,b,c,d}and{1,2,3,4}if in each correspondence A. a and c must correspond to even numbers B. b must correspond to 3? C. b must correspond to 3 and d to 4?
*September 13, 2012 by Joy*

**chemistry**

What intermolecular force(s) must be overcome to do the following. (a) sublime ice hydrogen bonding dipole-dipole interactions (not hydrogen bonding) induced-dipole/induced-dipole forces ion-dipole force You can choose one. Can some one please explain. I know the ...
*February 26, 2011 by Rebekah*

**physics**

A 220-kg crate rests on a surface that is inclined above the horizontal at an angle of 19.4. A horizontal force (magnitude = 525 N and parallel to the ground, not the incline) is required to start the crate moving down the incline. What is the coefficient of static friction ...
*November 7, 2011 by Nick*

**physics**

When you step on the accelerator to increase the speed of your car, the force that accelerates the car is eitheir the force of your foot on the accelerator, the force of friction of the road on the tires,the force of the engine on the drive shaft, or the normal force of the ...
*November 18, 2006 by tatiana*

**Physics**

the wind blows with a force of 425N north on a sail boat, while the water exerts a force of 325N west on the sailboat. Find the magnitude and direction of the net external force on the sailboat.
*April 9, 2012 by tom*

**chemistry 116**

Old fashion steam locomotives operated by boiling water and using the steam to drive a piston that moved the train. How much energy ( in MJ) is required to turn 824 gallons of water at 100 C into steam? The heat of fusion for water is 6.01 kJ/mol and the heat of vaporization ...
*January 24, 2015 by daniel miller *

**Accounting**

Does the structure of a company's portfolio matters in deciding on the required rate of return? In other words does the ratio of stocks to bonds affect the required rate of return?
*January 8, 2010 by Robert*

**math**

Does the structure of a company's portfolio matters in deciding on the required rate of return? In other words does the ratio of stocks to bonds affect the required rate of return?
*January 8, 2010 by Robert*

**Chemistry**

Is the following sentence true or false? To decide wheather a measurement has good precision or poor precision, the measurement must be made more than once. thanks in advance True. I hate T/F statements that have "must be". Life is full of exceptions to always, and must be. ...
*January 11, 2007 by Bryan*

**physics**

A container holds 1.1 g of oxygen at a pressure of 7.40 atm . How much heat is required to increase the temperature by 110 degree C at constant pressure? How much will the temperature increase if this amount of heat energy is transferred to the gas at constant volume?
*April 6, 2010 by Kidda*

**Chemistry **

If 395 grams of water at 21 Celsius absorbs 285kJ of heat from a mountain climbers stove at an elevation where the boiling point of water is 87 Celsius, is this amount of energy sufficient to heat the water to its boiling point? How many kJ are required to boil the water?
*November 6, 2011 by Kay *

**Physics**

Nuclear fusion reaction will occur in a gas duetorium hydrogen nuclei when a nuclei has an average kinetic energy of atleast 0.72MeV. What is the temperature required for nuclear fusion to occur with duetorium hydrogen? (take boltmann constant k = 1.38 x 10^23 j/k)
*November 13, 2013 by Adigun*

**Physics**

Nuclear fusion reaction will occur in a gas duetorium hydrogen nuclei when a nuclei has an average kinetic energy of atleast 0.72MeV. What is the temperature required for nuclear fusion to occur with duetorium hydrogen? (take boltmann constant k = 1.38 x 10^23 j/k)
*November 13, 2013 by Adigun*

**Advanced chem**

A rectangular block of wood is 40cm wide, 60cm long and 30cm deep. If its relative density is 0.7 and it floats with its 30cm side verticle, determine: (a)the length of the block above the water surface and (b)the minimum force required to completely submerge the block. Please...
*April 6, 2012 by Momito*

**physics**

A bicycle tire has a mass of 2.54 kg and a radius of 0.346 m. (a) Treating the tire as a hoop, what is its moment of inertia about an axis passing through the hub at its center? kg m2 (b) What torque is required to produce an angular acceleration of 0.710 rad/s2? N m (c) ...
*March 6, 2015 by alba*

**Physics 1**

A bicycle tire has a mass of 2.54 kg and a radius of 0.346 m. (a) Treating the tire as a hoop, what is its moment of inertia about an axis passing through the hub at its center? kg m2 (b) What torque is required to produce an angular acceleration of 0.710 rad/s2? N m (c) ...
*March 6, 2015 by Gina*

**physics**

A bicycle tire has a mass of 2.54 kg and a radius of 0.346 m. (a) Treating the tire as a hoop, what is its moment of inertia about an axis passing through the hub at its center? kg m2 (b) What torque is required to produce an angular acceleration of 0.710 rad/s2? N m (c) ...
*March 19, 2015 by alba*

**physics**

An elevator cab in the New York Marriott Marquis has a mass of 4.96 x 103 kg and can carry a maximum load of 1.80 x 103 kg. If the cab is moving upward at full load at 3.71 m/s, what power is required of the force moving the cab to maintain that speed?
*May 21, 2010 by jack*

**physic**

A gymnast of mass 68.0 {\rm kg} hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value 9.81 {\rm m/s^2} for the acceleration of gravity.
*November 16, 2010 by mas*

**Physics**

A 1.2m -long steel rod with a diameter of 0.50cm hangs vertically from the ceiling. An auto engine weighing 4.7kN is hung from the rod. By how much does the rod stretch?
*March 5, 2014 by Georgey*

**Physics**

A stretched wire 75cm long emits a fundamental frequency of 300Hz.By how much the length be changed so that it emits a fundamental note of 450Hz?
*September 9, 2014 by geofrey*

**Chemistry**

Please explain the answer. 1. Which statement about this reaction is correct? 2Fe(s)+3CO2(g)--->Fe2O3(s)+3CO(g) delta H = 26.6 kJ A. 26.6 kJ of energy are released for every mole of Fe reacted B. 26.6 kJ of energy are absorbed for every mole of Fe reacted C. 53.2 kJ of ...
*November 11, 2013 by Anonymous*

**CHEMISTRY**

Please explain the answer. Which statement about this reaction is correct? 2Fe(s)+3CO2(g)--->Fe2O3(s)+3CO(g) delta H = 26.6 kJ A. 26.6 kJ of energy are released for every mole of Fe reacted B. 26.6 kJ of energy are absorbed for every mole of Fe reacted C. 53.2 kJ of energy ...
*November 11, 2013 by Anonymous*

**Physics**

a packing ccrate slides down an incline ramp at constant velocity. Thus we can deduce that a) a frictional force is acting on it b) a net downward force is acting on it c) it may be accelerating d) it is not acted on by appreciable gravitational force with a constant velocity ...
*October 10, 2007 by Tammy*

**physics**

A crate slides down an incline right angled trough. The coefficient of kinetic friction between the crate and the trought is mew_k(not sure if i spelt it right). What is the acceleration of the crate in terms of mew_k theda and g? I think I need to use F=ma and then to find a ...
*November 28, 2006 by Brian*

**physics**

A source of e.m.f 110v and frequency 60hz is connected to a resistor, an indicator and a capacitor in series. When the current in the capacitor is 2A.the potential difference across the resistor is 80v and that across the inductor is 40v.calculate the -(1)potential difference ...
*March 24, 2010 by Ayo*

**Physics**

A parallel-plate capacitor is designed so that the plates can be pulled apart. The capacitor is initially charged to a potential difference of 80 Volts when the plates are 1.0 mm apart. The plates are insulated so that the charge cannot leak off. What is the potential ...
*September 22, 2011 by TP*

**physics**

A 200-kg crate is moved across a frictionless floor by applying a net force of 70 N for 5 seconds. This results in a final speed of 3 m/s after the crate moves a distance of 5m. What is the final kinetic energy of the crate?
*November 29, 2010 by royce calvin*

**physics**

A hammer with 10 J of kinetic energy hits a nail and pushes it 5.0 mm into a plank. Both the hammer and nail come to rest after the collision. What is the average force that acts on the nail while it moves the 5.0 mm?
*April 14, 2014 by Anonymous*

**physics**

You overindulged on a delicious dessert, so you plan to work off the extra calories at the gym. To accomplish this, you decide to do a series of arm raises holding a 5.5kg weight in one hand. The distance from your elbow to the weight is 36cm , and in each arm raise you start ...
*October 4, 2014 by dia*

**English**

what message does the poem "Ozymandias" convey about earthly power? A. power will bring fame B. with power comes despair C. power is fleeting and will decay D. power brings glory I'm stuck between B and C? I met a traveller from an antique land Who said: "Two vast and ...
*March 21, 2011 by anthony*

**physics**

In a television picture tube, electrons strike the screen after being accelerated from rest through a potential difference of 25000V. The speeds of the electrons are quite large, and for accurate calculations of the speeds, the effects of special relativity must be taken into ...
*March 26, 2008 by Cindy*

**physics**

under the influence of its drive force, snowmobile is moving at constant velocity along a horizontal patch of snow. When drive force is shut off, snowmobile coasts to a halt. a) During the coasting phase, what is the net external force acting on the snowmobile b) How does work...
*February 12, 2012 by Sushmitha*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...
*June 14, 2013 by Josh*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...
*June 14, 2013 by Josh*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...
*June 14, 2013 by Josh*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...
*June 14, 2013 by Josh*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...
*June 14, 2013 by Josh*

**Melting Ice Chemistry**

You have an ice cube (H2O) that weighs 5 grams and is at a temperature of -10 degrees Celsius. How much heat energy(in joules) is required to melt the ice cube and raise the temperature of the resulting liquid water to 15 degrees Celsius? A. 1803 J B. 2088.5 J C. 257.5 J D. ...
*June 14, 2013 by Josh*

**Math**

(x+20)(x-9)(x+10)>0 Please help? I'm stuck...need to find the solution set. so far I have x^3+21x^2-70x-1800>0 am I correct so far? What do I need to do next?
*October 7, 2010 by asd*

**maths**

an aeroplane flying at 600 km travels for 3 hours on a bearing of 310T how far north and how far wesr is it from its starting point after 3 hours
*September 19, 2011 by jess*

**Physics help please**

A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron. i found the photon energy using compton scatter equation at 110 degrees, ...
*September 25, 2014 by Sarah*

**PHYSICS!!!!!!!!!!!!!!!!**

the height from where the water bomb will be released on the overpass is 4.5 m and the target student is 170 cm tall. the student realises that, as his target will be moving, he must release the water bomb when his friend is a certain horizontal distance from the point of ...
*October 16, 2012 by NEED HELP ASAP!!!!!!!!!!!*

**PHYSICS!!!!!!!!!!!!!!!!**

the height from where the water bomb will be released on the overpass is 4.5 m and the target student is 170 cm tall. the student realises that, as his target will be moving, he must release the water bomb when his friend is a certain horizontal distance from the point of ...
*October 17, 2012 by NEED HELP ASAP!!!!!!!!!!!*

**Physics**

An arrow is fired with a speed of 20.0 m/s at a block of Styrofoam resting on a smooth surface. The arrow penetrates a certain distance into the block before coming to rest relative to it. During this process the arrow's deceleration has a magnitude of 1300 m/s2 and the block'...
*October 12, 2009 by Robert C*

**Chemistry**

How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range, that the specific heat of steam is 1.99 J/g.oC, and the heat of vaporization ...
*September 16, 2008 by Jimmy*

**Statistics !**

Hi I have calculated some statistics using a spreadsheet program and I have to compare three slopes of regression and their significance level in an energy species hypothesis.. -2.11 level of significance is 5% -4.73 level of significance is 1% -4.13 level of significance is 1...
*June 4, 2009 by Gary*

**Chem**

How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range, that the specific heat of steam is 1.99 J/g.oC, and the heat of vaporization ...
*February 4, 2012 by Dan *

**Physics**

Mars has a mass of about 6.4 X 10^23 kg, and its moon Phobos has a mass of about 9.6 X 10^15 kg. If the magnitude of the gravitational force between the two bodies is 4.6 X 10^15 N, how far apart are Mars and Phobos?
*December 7, 2008 by Kathrine*

**Physics**

Mars has a mass of about 6.4*10^23 kg, and it's moon Phobos has a mass of about 9.6*10^15 kg.If the magnitude of the grvitational force between the two bodies is 4.6* 10^15 N, how far apart are Mars and Phobos?
*December 13, 2009 by Shanique*

**Physics**

Georgie was pulling her brother (of mass 26 kg) in a 11.9 kg sled with a constant force of 37 N for one block (100 m). How much work did Georgie do? How long would a 300 W lightbulb have to glow to produce the same amount of energy expended by Georgie?
*January 6, 2012 by Anonymous*

**physics**

A uniform metal rod of mass 100 kg and L (2.5m) is suspended from the side of the building. On the far end of a mass of 100 kg is hung by a rope, (distance L from a building). The rod is connected to the building on the left end by a pivot, (and a force F is exerted on the rod...
*November 25, 2010 by Luke*

**Advanced Functions**

The vertical position, h, in metres, of a gondola on a Ferris wheel is modelled using the function h = 10 sin ((pi/15) (t-d)) + 12 where t is the time, in seconds. The gondola must assume a vertical position of 7 m at t=0 s , and be on its way upward. Determine the phase shift...
*November 20, 2009 by -*

**physics**

A car has a flywheel ( a diks of R=0.2m and uniformly distributed mass M=100kg) that can convert 25% of the rotational kinetic energy into translational kinetic energy. The mass of the car is 1000kg ( including flywheel). Suppose the car is at rest, and the flywheel has a ...
*December 30, 2013 by Al*

**Physics**

In a location in outer space far from all other objects, a nucleus whose mass is 3.57232e-25 kg and which is initially at rest undergoes spontaneous "alpha" decay. The original nucleus disappears, and two new particles appear: a He-4 nucleus of mass 6.640678e-27 kg (an "alpha ...
*October 7, 2011 by bryce tanaka*

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