4869

Physics Work,Power & Energy Level: Misc Level

A 68.0 kg diver is 1.90 m above the water, falling at speed of 8.20 m /s. Calculate her kinetic energy as she hits the water. (Neglect air friction)


4837

Physics Work,Power & Energy Level: Misc Level

A 0.60 -kg particle has a speed of 2.0 m/s at point A and a kinetic energy of 7.5 Joules at point B.What is

a. its kinetic energy at A

b.its speed at point B

c.the total work done on the particle as it moves from A to B


4835

Physics Work,Power & Energy Level: Misc Level

A block of mass 2.50 kg is pushed 2.20 along a frictionless horizontal table by a constant 16.0- N force directed 25.0 degree below the horizontal. Determine the work done by:

a. the applied force

b.the normal force exerted by the table

c.the force of gravity

d.the net force on the block


4807

Physics Work,Power & Energy Level: Misc Level

A washer ( 5.0 g ) sits at the end of a horizontal spring ( k= 100 N/ m ) which is slipped over a large bolt. The washer is pressed back against the spring so as to compress it 2.0 cm. How fast will the washer shoot off the bolt if the washer is released?


4761

Physics Work,Power & Energy Level: Misc Level

A car coasts down a long hill and then up a smaller one onto a level surface, where it has a speed of 32 ft /sec. If the car started 200 ft. above the lowest point in the track. How far above this lowest point is the level surface?


4707

Physics Work,Power & Energy Level: Misc Level

A 3500 watt motor is lifting a car that weighs 3200 Ibs 2.5 meters, How long will it take? how long if the motor was 5,000 watts?


4690

Physics Work,Power & Energy Level: Misc Level

A ping pong ball weighs 2.5 x10 -2 N. The ball is placed inside a cup that sits on top of a vertical spring. If the spring is compressed 0.055 m and released, the maximum height above the compressed position that the ball reaches is 2.84 m.Neglect air restance and determine the spring constant.


4589

Physics Work,Power & Energy Level: Misc Level

What is the source of the energy that powers most geological processes?


4571

Physics Work,Power & Energy Level: Misc Level

A dart gun shoots a small dart using a compressed spring .If I shoot a 0. 1 kg dart with a speed of 8 m /s using the gun, how much potential energy did I have to store in the spring to accomplish this feat? ( Assume that this is a conservative system ).


4524

Physics Work,Power & Energy Level: Misc Level

A 1.0 kg pendulum bob is raised such that it s 1.0 m long string forms a 30 degree angle from the vertical. A) What is the potential energy of the pendulum when the bob is at the 30 degree angle.B) If the bob is released, what is its velocity as it passes through the lowest point.


4509

Physics Work,Power & Energy Level: Misc Level

A 1.20 kg box slides down a rough incline plane from a height h of 1.75 m. The box had a speed of 2.33 m/s at the top and a speed of 1.90 m /s at the bottom. Calculate the mechanical energy lost due to friction (as heat, etc).


4508

Physics Work,Power & Energy Level: Misc Level

A 2400 kg block of granite is pulled up an incline that has an angle of inclination 0 = 18 % with a constant speed of 1.81 m/s by a steam winch ( see Figure ) .The coefficient of kinetic friction between the block and the incline is 0.08. How much power must be supplied by the winch?


4503

Physics Work,Power & Energy Level: Misc Level

Water flows over a waterfall which is 54.0 m high at an average rate of 1.10 E +6 kg /s. If all the potential energy of the water were converted into electric energy, how much electrical power could be produced by these falls?


4487

Physics Work,Power & Energy Level: Misc Level

A 3.0 -kg stone is dropped from a height of 100 m. Find its kinetic and potential energies when it is 50 m from the ground.


4400

Physics Work,Power & Energy Level: Misc Level

A 60 kg women runs up a staircase 15 m high ( vertically ) in 20 sec. a ) How much power does she expend. b) What is her horsepower rating.


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