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A 60.0kg athlete runs up a flight of 25 steps, each 20.Ocm high, in 10.0s. Calculate the work done by gravity on the athlete and the gain in gravitational potential energy by the athlete.
A power plant produces 1064.8 MWt. If 771.5 MWt is rejected to the environment, what is the thermal efficiency of the plant
A gas is compressed at a constant pressure of 0.320 atm from a volume of 8.00 L to 5.00 L. In the process, 400 J of heat energy flows out of the gas. What is the work done by the gas
A drunk driver in a 1600 kg car plows into a 1500 kg parked car with its brake set. Police measurements show that the two cars skid together a distance of 19 m before stopping. If the effective coefficient of friction is 0.78, how fast was the dru..
A uniform diving board, 12m long and 20kg mass is placed on a platform. How far can a 60kg person walk down the board from the edge of the platform without board tipping over.
A copper washer is to be fit in place over a steel bolt. Both pieces of metal are at 29.7°C. to what temperature must the washer be raised so it will fit over the bolt
A lighted candle is placed 37 cm in front of a diverging lens. The light passes through the diverging lens and on to a converging lens of focal length 10 cm that is 5 cm from the diverging lens
A 15-microF capacitor is connected to a 50-V battery and becomes fully charged, what is the voltage across the capacitor's plates after the slab is inserted
An air puck of mass m1 = 0.21 kg is tied to a string and allowed to revolve in a circle of radius R = 0.8 m on a frictionless horizontal table. What is the horizontal force acting on the puck
The fundamental frequency of a pipe that is open at both ends is 598Hz. How long is this pipe
A rattlesnake can strike with the acceleration equivalent to an increase in speed from 0 to 60 mi/h in 1/2 s. If the rattlesnake's head weighs 0.33 lb, what average power does the rattlesnake generate throughout its strike.
A beam of light is incident on a glass plate ( = 1.62) in air and the reflected ray is completely polarized. What is the angle of refraction for the beam
A plastic bag is filled with nitrogen at atmospheric pressure and 27.0 oC. If hot air is used instead of nitrogen, what is the required volume of the balloon if the air inside can be maintained at 39.0 oC
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