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March 29, 2015

March 29, 2015

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

Find the component form of ⃗v given a magni- tude of 9 and an angle of θ = 90◦ with positive
*Wednesday, December 17, 2014 at 11:04am*

**Science-Physics**

A mover is pushing a crate across the floor. He exerts a force of 500 Newtons and pushes the crate a distance of 5 Meters. How much work did the mover do on the crate?
*Wednesday, December 17, 2014 at 9:50am*

**physics**

the second floor of a house is 6m above street level. How much work is required to lift a 300-kg refrigerator to the second-floor level?
*Wednesday, December 17, 2014 at 9:11am*

**Physics**

box of books weighs 350 n is shoved across the floor with a force of 500 n directed downward at angle of 37 with horizontal. if muk between box and floor is .5 how long does it take box to move 4 m starting from rest and what is largest value of muk that will allow the box to ...
*Wednesday, December 17, 2014 at 9:08am*

**physics**

A steel ball is thrown vertically upward and a ping pong ball is dropped vertically downward. the two balls roll at the same time. which will have a greater acceleration, why?
*Wednesday, December 17, 2014 at 8:55am*

**Physics**

a person standing at the edge of a seaside cliff kicks a stone horizontally over the edge with speed of 31 m/s cliff is 51 m above water. how far from base of cliff does stone land and what is speed of stone when it hits water
*Wednesday, December 17, 2014 at 8:51am*

**Physics**

You plan to fly a model airplane of mass 0.655 kg that is attached to a horizontal string. The plane will travel in a horizontal circle of radius 5.50 m. (Assume the weight of the plane is balanced by the upward "lift" force of the air on the wings of the plane.) The...
*Wednesday, December 17, 2014 at 6:29am*

**physics**

The radius of curvature of a loop-the-loop for a roller coaster is 11.8 m. At the top of the loop (with the car inside the loop), the force that the seat exerts on a passenger of mass m is 0.80mg. Find the speed of the roller coaster at the top of the loop.
*Wednesday, December 17, 2014 at 5:20am*

**Physics**

A 2.13 kg mass is suspended from a string which is pulled upward. The mass accelerates upwards with an acceleration of 3.10m/s2. What is the tension in the string?
*Tuesday, December 16, 2014 at 11:01pm*

**physics**

A balloon is rising at 3.6 m/s at same time is blown by wind for 5.4 m/s from east. Find the actual velocity and direction of hte balloon.
*Tuesday, December 16, 2014 at 8:59pm*

**physics**

The frequency and wavelength of a transverse wave on a string are 340 Hz and 0.70 m, respectively. The tension in the string is 110 N. What is the linear density of the string?
*Tuesday, December 16, 2014 at 8:42pm*

**Physics**

Using light of wavelength 600.0nm in a double slit apparatus we find delta x = 1.0cm. If we use the same apparatus for light of wavelength 450.0 nm, what is the new delta x on the screen? Delta x = L*lambda/d But L and d are not given, so how do I approach this problem?
*Tuesday, December 16, 2014 at 8:17pm*

**physics**

A soccer ball is kicked with an initial horizontal velocity of 16.5 m/s from a 92 meter high cliff. Determine the time it took the ball to reach the ground and how far the ball got from the edge of the cliff.
*Tuesday, December 16, 2014 at 8:16pm*

**Physics**

1.) A tennis ball (mass = 57 grams) is held directly above a basketball (mass = 624 grams)that is held 4.7 meters off the ground. Both are dropped simultaneously. Assuming an elastic collision, how high above the ground does the tennis ball reach after bouncing? (Note that the...
*Tuesday, December 16, 2014 at 8:13pm*

**Physics**

An airliner lands with a speed of 48.5 m/s. Each wheel of the plane has a radius of 1.25 m and a moment of inertia of 110 kg · m2. At touchdown, the wheels begin to spin under the action of friction. Each wheel supports a weight of 1.40 ✕ 104 N, and the wheels ...
*Tuesday, December 16, 2014 at 7:30pm*

**physics**

an object is dropped from a vertical cliff. How long does it take to reach 85 km/h?
*Tuesday, December 16, 2014 at 2:09pm*

**Physics I**

I'm not sure how to address any of these. I"ve attempted them but each time I do, I've gotten different answers. I'm not even sure where to begin. 1. The Duke’s efforts to conquer the Count are starting to really falter. He has been forced back away from ...
*Tuesday, December 16, 2014 at 12:48pm*

**Physics**

The radius of curvature of a loop-the-loop for a roller coaster is 11.8 m. At the top of the loop (with the car inside the loop), the force that the seat exerts on a passenger of mass m is 0.80mg. Find the speed of the roller coaster at the top of the loop. 1 m/s
*Tuesday, December 16, 2014 at 9:18am*

**Physics**

You plan to fly a model airplane of mass 0.655 kg that is attached to a horizontal string. The plane will travel in a horizontal circle of radius 5.50 m. (Assume the weight of the plane is balanced by the upward "lift" force of the air on the wings of the plane.) The...
*Tuesday, December 16, 2014 at 8:52am*

**physics**

A 200 gram copper calorimeter contains 400 grams of water at 25 C. A metal specimen weighing 250 grams is heated to a certain temperature and the plunged into the calorimeter The final temperature of the mixture is 42C. If then specific heat of the metal specimen is 0.09 cal/(...
*Tuesday, December 16, 2014 at 8:51am*

**Physics**

The radius of curvature of a loop-the-loop for a roller coaster is 11.8 m. At the top of the loop (with the car inside the loop), the force that the seat exerts on a passenger of mass m is 0.80mg. Find the speed of the roller coaster at the top of the loop. m/s
*Tuesday, December 16, 2014 at 8:34am*

**physics**

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 12.2 m long. His speed at the bottom of the swing is 8.6 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that Tarzan can have ...
*Tuesday, December 16, 2014 at 8:12am*

**Physics**

A roller-coaster car speeds down a hill past point A where R1 = 8.2 m and then rolls up a hill past point B where R2 = 15.4 m, as shown below. (a) The car has a speed of 21.0 m/s at point A. if the track exerts a normal force on the car of 2.30 ✕ 104 N at this point, ...
*Tuesday, December 16, 2014 at 8:00am*

**physics**

. A proton is released from rest at point A in a uniform electric field that has a magnitude of . The proton undergoes a displacement to point B in the direction of . Calculate the speed of the proton after completing the displacement.
*Tuesday, December 16, 2014 at 5:49am*

**Physics**

I don't completely understand what this question is asking: Three people are standing on a horizontally rotating platform in an amusement park. One person is almost at the edge, the second one is (3/5)R from the center, and the third is (1/2)R from the center. Compare ...
*Monday, December 15, 2014 at 9:34pm*

**physics**

A person sitting in a chair (combined mass 80kg) is attached to a 6m long cable. The person moves in a horizontal circle. The cables angle is 62 degrees below the horizontal. What is the persons speed? Note: the radius of the circle is not 6m. I really just need and equation ...
*Monday, December 15, 2014 at 9:17pm*

**physics**

Calculate the maximum deceleration of a car that is heading down a 14.5° slope (one that makes an angle of 14.5° with the horizontal) under the following road conditions. You may assume that the weight of the car is evenly distributed on all four tires and that the ...
*Monday, December 15, 2014 at 8:46pm*

**physics**

A 75 kg bobsled is pushed along a horizontal surface by two athletes. After the bobsled is pushed a distance of 4.5 m starting from an initial speed of 1.2 m/s, its speed is 6.0 m/s. What is the change in kinetic energy? Find the magnitude of the net force on the bobsled.
*Monday, December 15, 2014 at 7:28pm*

**physics**

A student wearing frictionless in-line skates on a horizontal surface is pushed, from rest, by a friend with a constant force of 45 N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 352 J?
*Monday, December 15, 2014 at 7:28pm*

**physics**

How much work is required to accelerate a 0.145 kg baseball from rest, to a speed of 38.7 m/s?
*Monday, December 15, 2014 at 7:27pm*

**Physics**

In an electricity experiment, a 0.900g plastic ball is suspended on a 50.0cm long string and given an electric charge. A charged rod brought near the ball exerts a horizontal electrical force F⃗ elec on it, causing the ball to swing out to a 23.0∘ angle and remain ...
*Monday, December 15, 2014 at 12:24pm*

**physics**

Calculate the half-life of a radioactive substance that decays by a factor of 3 in concentration every 1 million years
*Monday, December 15, 2014 at 12:19pm*

**physics**

A dragster starts from rest and accelerates down a track. Each tire has a radius of 0.320 m and rolls without slipping. At a distance of 382 m, the angular speed of the wheels is 255 rad/s. Determine (a) the linear speed of the dragster and (b) the magnitude of the angular ...
*Monday, December 15, 2014 at 12:03pm*

**physics**

A full shopping cart requires a force of 88.0 Newtons to move across a horizontal floor at a constant velocity. If the cart has a mass of 32.1 kg, what is the coefficient of kinetic friction between the cart and the floor?
*Monday, December 15, 2014 at 12:02pm*

**Physics **

Instructions: Read the following paragraph carefully. Then use what you know about momentum, work, and energy to answer the following questions. Be sure to show your work. You are a traffic accident investigator. You have arrived at the scene of an accident. Two cars of equal ...
*Monday, December 15, 2014 at 11:31am*

**Physics **

Instructions: Read the following paragraph carefully. Then use what you know about momentum, work, and energy to answer the following questions. Be sure to show your work. You are a traffic accident investigator. You have arrived at the scene of an accident. Two cars of equal ...
*Monday, December 15, 2014 at 10:51am*

**physics**

A skier starts from rest and slides down a 20° incline 100 meters long. if the coefficient of friction is 0.09, how much heat is dissipated into the environment as the skier descends?
*Monday, December 15, 2014 at 10:33am*

**Physics**

A ball is thrown upwards with an initial velocity of 16 m/s. What is the velocity of the ball 1.5 s later? After the ball leaves the hand of the thrower, what is the value of acceleration acting on the ball as it is rising upwards? 9.8x1.5 = 14.7. 16-14.7=1.3 m/s after 1.5s. ...
*Monday, December 15, 2014 at 6:44am*

**physics **

a jogger does 2.5 *10^5 of work during an exercise routine. her internal energy decreases by 6.8*x10^5. how much heat did she absorb or give off?
*Monday, December 15, 2014 at 3:43am*

**Physics AP**

So there are two blocks that are connected over a light frictionless pulley. Block A has a mass of 2 kg on a frictionless surface while block b has a mass of 1 kg that hangs freely. It asks for speed, change in speed, and tension. I know that tension can be 2m1m2/m1m2 times g...
*Monday, December 15, 2014 at 12:15am*

**physics **

radius R of the orbit of a geosynchronous satellite that circles the earth. (Note that R is measured from the center of the earth, not the surface.) You may use the following constants: The universal gravitational constant G is 6.67×10−11N⋅m2/kg2. The mass of...
*Sunday, December 14, 2014 at 10:44pm*

**Physics**

A 283 g air track glider moving at 0.69 m/s on a 2.4 m long air track collides elastically with a 467 g glider at rest in the middle of the horizontal track. The end of the track over which the struck glider moves is not frictionless, and the glider moves with a coefficient of...
*Sunday, December 14, 2014 at 10:42pm*

**physics**

What happens to the diffraction pattern when you have a small wavelength and large slit width in single slit interference? Say you have a light of 700nm shining through a diffraction grating with the separation of slits being 450nm. What pattern would you see? The answer is ...
*Sunday, December 14, 2014 at 10:39pm*

**physics**

There are 45,000 calories in one ounce of pasta, how many ounces do i have to eat to get from ground floor to the 3rd floor (18.2 m)? my weight is 58kg
*Sunday, December 14, 2014 at 10:11pm*

**physics**

A car is moving at 53 miles per hour. The kinetic energy of that car is 5 × 105 J. How much energy does the same car have when it moves at 102 miles per hour? Answer in units of J HELP!!!! I've tried doing (5*10 J)* (102/53)^2 and I keep on getting it wrong PLEASE ...
*Sunday, December 14, 2014 at 9:46pm*

**physics**

A radar antenna is tracking a satellite orbiting the earth. At a certain time, the radar screen shows the satellite to be 181 km away. The radar antenna is pointing upward at an angle of 66.2 ° above the ground. Find (a) the x and (b) the y components (in km) of the ...
*Sunday, December 14, 2014 at 9:43pm*

**physics**

In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.0442 s, during which time it experiences an acceleration of 231 m/s2. The ball is launched at an angle of 55.0° above the ground. Determine the (a) horizontal ...
*Sunday, December 14, 2014 at 9:43pm*

**physics**

A rope attached to a truck pulls a 180-kg motorcycle at 9.0 m/s. The rope exerts a 400-N force on the motorcycle at an angle of 15∘ above the horizontal. What is the work that the rope does in pulling the motorcycle 300 m? Express your answer with the appropriate units.
*Sunday, December 14, 2014 at 9:09pm*

**physics**

A 5 kg object moving with a speed of 6.6 m/s collides with an 18 kg object moving with a velocity of 8.4 m/s in a direction 19 degrees from the initial direction of the motion of the 5 kg object. What is the speed of the two objects after collision if they remain stuck ...
*Sunday, December 14, 2014 at 7:56pm*

**physics**

A block at rest. The coefficients of static and kinetic friction are .75(Static) and .64(Kinetic). The acceleration of gravity is 9.8m/s^2 and the mass is 46kg. I've solved for the frictional force which is, 252.0841609N. Though what is the largest angle which the incline ...
*Sunday, December 14, 2014 at 7:31pm*

**physics**

I need some help with determining the equation for this problem. "The block of mass m is released from rest on the frictionless incline. After sliding a certain distance, it compresses a spring and comes to rest at a distance of y beneath its original position. How much ...
*Sunday, December 14, 2014 at 6:11pm*

**physics**

In the drawing, the weight of the block on the table is 428. N and that of the hanging block is 195. N. Ignore friction, the mass of the rope, and the mass of the pulley. Find the acceleration of the two block system in m/s2.
*Sunday, December 14, 2014 at 5:00pm*

**physics**

A cup of coffee is sitting on a table in an airplane that is flying horizontally. The coefficient of static friction between the cup and the table is 0.258. Suddenly, the plane accelerates horizontally. What is the maximum acceleration (in m/s2) that the plane can have without...
*Sunday, December 14, 2014 at 4:47pm*

**physics**

A student is skateboarding down a ramp that is 6.52 m long and inclined at 19.8 degrees with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp 2.24 m/s. Neglect friction and find the speed at the bottom of the ramp in m/s.
*Sunday, December 14, 2014 at 4:43pm*

**Physics**

A body moving with uniform acceleration covers 64.4 m in 7s and 110 m in 10s. Find its initial velocity and acceleration. Okay, I know how to solve this, however, i'm not quite sure which equation i'm supposed to use. Am I going to need 2 equations to solve this?
*Sunday, December 14, 2014 at 10:30am*

**Physics**

An object is thrown upwards from a height of 50.0m at an initial speed of 19.6m/s. Determine how long will it take for the object to reach the ground.
*Sunday, December 14, 2014 at 7:56am*

**PHYSICS**

FIND THE PRESSURE EXERTED ON A 6FTX10FT WALL BY THE ATMOSPHERE, IF ATMOSPHERE PRESSURE IS 14.7 PSI.
*Sunday, December 14, 2014 at 12:55am*

**physics**

Calculate the acceleration of a sled that is heading down a 50° slope (one that makes an angle of 50° with the horizontal). The coefficient of kinetic friction on ice is μk = 0.100. (Take the x direction to be parallel to and down the slope and the y direction to ...
*Sunday, December 14, 2014 at 12:21am*

**Physics**

A projectile is shot vertically upward with a given initial velocity. It reaches a maximum height of 100 m. If, on a second shot, the initial velocity is doubled then the projectile will reach a maximum height of ____________?
*Saturday, December 13, 2014 at 11:34pm*

**Physics**

A bowling ball slows down at rate of .12 m/s^2. 5 seconds after it starts down the bowling alley its speed is 15 m/s. What was its initial speed?
*Saturday, December 13, 2014 at 11:20pm*

**physics**

Calculate the mass of the air in a 5 m ✕ 3 m ✕ 2.5 m room, assuming that it is at 1 atm and 19°C.
*Saturday, December 13, 2014 at 8:53pm*

**Physics**

An archer needs to hit a bull’s eye on a target at eye level 60.0 ft away. If the archer fires the arrow from eye level with a speed of 47.0 ft/s at an angle of 25 degree above the horizontal, will the arrow hit the target?
*Saturday, December 13, 2014 at 8:24pm*

**physics**

In state-of-the-art vacuum systems, pressures as low as 1.00 10-9 Pa are being attained. Calculate the number of molecules in a 1.80-m3 vessel at this pressure and a temperature of 31.0°C.
*Saturday, December 13, 2014 at 6:20pm*

**physics**

The pressure gauge on a tank registers the gauge pressure, which is the difference between the interior pressure and exterior pressure. When the tank is full of oxygen (O2), it contains 10.0 kg of the gas at a gauge pressure of 43.0 atm. Determine the mass of oxygen that has ...
*Saturday, December 13, 2014 at 6:20pm*

**physics**

Gas is contained in a 6.00-L vessel at a temperature of 15.0°C and a pressure of 6.00 atm. (a) Determine the number of moles of gas in the vessel. (b) How many molecules are in the vessel?
*Saturday, December 13, 2014 at 6:19pm*

**physics**

A rigid tank contains 1.80 moles of an ideal gas. Determine the number of moles of gas that must be withdrawn from the tank to lower the pressure of the gas from 21.6 atm to 5.80 atm. Assume the volume of the tank and the temperature of the gas remain constant during this ...
*Saturday, December 13, 2014 at 6:18pm*

**physics**

Gas is confined in a tank at a pressure of 12.7 atm and a temperature of 22.0°C. If two-thirds of the gas is withdrawn and the temperature is raised to 79.0°C, what is the pressure of the gas remaining in the tank?
*Saturday, December 13, 2014 at 6:18pm*

**physics**

A sample of lead has a mass of 69.00 kg and a density of 1.130 104 kg/m3 at 0°C. (Assume the average linear expansion coefficient for lead is 2.900 10-5(°C−1).) (a) What is the density of lead at 80.00°C? (Give your answer to four significant figures.) (b) ...
*Saturday, December 13, 2014 at 6:18pm*

**physics**

A hollow aluminum cylinder 22.5 cm deep has an internal capacity of 2.000 L at 16.0°C. It is completely filled with turpentine at 16.0°C. The turpentine and the aluminum cylinder are then slowly warmed together to 70.0°C. (The average linear expansion coefficient ...
*Saturday, December 13, 2014 at 6:16pm*

**physics**

The active element of a certain laser is made of a glass rod 29.0 cm long and 1.20 cm in diameter. Assume the average coefficient of linear expansion of the glass is equal to 9.00 10-6 (°C)-1. The temperature of the rod increases by 70.0°C. (a) What is the increase in ...
*Saturday, December 13, 2014 at 6:15pm*

**physics**

The concrete sections of a certain superhighway are designed to have a length of 26.0 m. The sections are poured and cured at 10.0°C. What minimum spacing should the engineer leave between the sections to eliminate buckling if the concrete is to reach a temperature of 45.0...
*Saturday, December 13, 2014 at 6:14pm*

**physics**

A copper telephone wire has essentially no sag between poles 34.0 m apart on a winter day when the temperature is −20.0°C. How much longer is the wire on a summer day when the temperature is 32.0°C? (Note: Table 19.1 is available for use in solving this problem.)
*Saturday, December 13, 2014 at 6:14pm*

**physics**

In a student experiment, a constant-volume gas thermometer is calibrated in dry ice (−78.5°C ) and in boiling pentane (36.1°C). The separate pressures are 0.896 atm and 1.433 atm. Hint: Use the linear relationship P = A + BT, where A and B are constants. What ...
*Saturday, December 13, 2014 at 6:10pm*

**physics**

A baseball player exert a force of 125 N on a 0.18 kg baseball for 33 sec. what is the baseball change of momentum ?
*Saturday, December 13, 2014 at 5:43pm*

**physics**

A 4.10 kg block is pushed along the ceiling with an constant applied force of F = 81.5 N that acts at an angle è = 52° with the horizontal, as in the figure below. The block accelerates to the right at 5.10 m/s2. Determine the coefficient of kinetic friction between...
*Saturday, December 13, 2014 at 2:59pm*

**Physics**

An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
*Saturday, December 13, 2014 at 1:53pm*

**Physics**

An object is placed 4 cm in front of a convex lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
*Saturday, December 13, 2014 at 1:52pm*

**Physics**

An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
*Saturday, December 13, 2014 at 1:52pm*

**Physics**

What is the frequency of a sound wave in air at 20°C that has a wavelength of 0.4 m?
*Saturday, December 13, 2014 at 1:35pm*

**Physics**

A cubical object of sides 5 cm is immersed completely in water. What is the force of buoyancy on the object? (Assume g = 10 m/s2)
*Saturday, December 13, 2014 at 1:19pm*

**grade 10 physics**

john is walking at such speed so that his kinetic energy is 20 J, what is his speed? It started to rain John runs at a rate of 4.2 m/s find the change in KE.
*Saturday, December 13, 2014 at 10:13am*

**Physics grade 10**

john is walking at such speed so that his kinetic energy is 20 J, what is his speed? It started to rain John runs at a rate of 4.2 m/s find the change in KE.
*Saturday, December 13, 2014 at 10:08am*

**physics**

a car sounds its horn as it travels at a steady speed of 15m/s along a straight road between two observers x and y. the observer x heras a frequency of 538 hz while observer y hears a lower frequency. 1 is the car traveling towards x or y 2what would the frequency be heard ...
*Saturday, December 13, 2014 at 4:46am*

**physics**

prove that the moon complete its one revolution around the earth in (27.3) days.distance of moon from the surface of the earth is (380000km).
*Saturday, December 13, 2014 at 12:37am*

**physics 1**

444g mass vibrates according to the equation x = 0.348 sin (5.82 t) where x is in meters and t is in seconds. Determine the total energy. Determine the kinetic energy when x is 14.0cm. Determine the potential energy when x is 14.0cm.
*Saturday, December 13, 2014 at 12:33am*

**physics**

Two objects of same material are travelling near you. Object A is a 1.9 kg mass traveling 8 m/s; object B is a 2 kg mass traveling 5 m/s. Which object would make you feel worse if you are hit by it?
*Saturday, December 13, 2014 at 12:03am*

**physics**

A skydiver weighing 840 N opens his parachute at the appropriate height from the ground. The air exerts a significant upward drag force, which is initially greater than the weight of the diver. This helps to slow the skydiver down. What is the diver's acceleration (both ...
*Friday, December 12, 2014 at 11:58pm*

**Physics**

A 283 g air track glider moving at 0.69 m/s on a 2.4 m long air track collides elastically with a 467 g glider at rest in the middle of the horizontal track. The end of the track over which the struck glider moves is not frictionless, and the glider moves with a coefficient of...
*Friday, December 12, 2014 at 11:00pm*

**Physics**

A 3.32 kg mud ball has a perfectly inelastic collision with a second mud ball that is initially at rest. The composite system moves with a speed equal to one-eighth the original speed of the 3.32 mud ball. What is the mass of the second mud ball?
*Friday, December 12, 2014 at 9:39pm*

**Physics**

A 5.6 g coin sliding to the right at 22.6 cm/s makes an elastic head-on collision with a 16.8 g coin that is initially at rest. After the collision, the 5.6 g coin moves to the left at 11.3 cm/s. (a) Find the final velocity of the other coin. cm/s (b) Find the amount of ...
*Friday, December 12, 2014 at 9:10pm*

**Physics**

Two carts with masses of 4.66 kg and 3.00 kg move toward each other on a frictionless track with speeds of 4.77 m/s and 3.33 m/s respectively. The carts stick together after colliding head-on. Find the final speed.
*Friday, December 12, 2014 at 8:59pm*

**physics**

A car is moving at 36 miles per hour. The kinetic energy of that car is 5 × 105 J. How much energy does the same car have when it moves at 115 miles per hour? Answer in units of J
*Friday, December 12, 2014 at 8:58pm*

**Physics**

A tennis player places a 60 kg ball machine on a frictionless surface, as shown below. The machine fires a 0.057 kg tennis ball horizontally with a velocity of 35.4 m/s toward the north. What is the final velocity of the machine?
*Friday, December 12, 2014 at 8:49pm*

**physics 1**

Two isolated masses, M1 = 2.20 kg and M2 = 589 kg are initially rest, a distance d= 161 cm apart. Their gravitational attraction is the only force acting. Calculate the time it takes for M1 to move from that distance to 159 cm from M2. Assume that M2 does not move and that the...
*Friday, December 12, 2014 at 7:25pm*

**Physics**

A bullet of mass m= 2.50×10-2kg is fired along an incline and imbeds itself quickly into a block of wood of mass M= 1.60kg. The block and bullet then slide up the incline, assumed frictionless, and rise a height H= 1.45m before stopping. Calculate the speed of the bullet...
*Friday, December 12, 2014 at 7:23pm*

**Physics**

a 1000 kg space craft at 500 m/s is on a collision course with a 400 kg satellite travelling at 700 m/s . Their paths are converging at a 45 degree angle . After the collision they remain locked together. What is the final speed of both satellites? What angle is this at
*Friday, December 12, 2014 at 3:07pm*

**physics**

define pendulum bob amplitude oscillation
*Friday, December 12, 2014 at 2:15pm*

**physics**

A football punter accelerates a 0.47 kg football from rest to a speed of 6.4 m/s in 0.27 s, what constant force does the punter exert on the ball? N upward
*Friday, December 12, 2014 at 12:26pm*

**physics**

A helicopter flies south at 185km/hr relative to the ground. The wind is blowing 60km/hr to the west compared to the ground. What is the helicopter's speed to an observer on the ground?
*Friday, December 12, 2014 at 11:22am*

**physics**

A diffraction grating with 150 slits per centimeter is used to measure the wavelengths emitted by hydrogen gas. At what angles in the fourth-order spectrum would you expect to find the two violet lines of wavelength 434 nm and of wavelength 410 nm? (angles in radians)
*Friday, December 12, 2014 at 8:00am*

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