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A 130 lb subject did 33 lifts/min up a 30 cm step for 5 minutes.
A) what was the work rate? power output?
b) what was the total work done?
An ideal spring has the spring constant k = 428 N/m. find the distance this spring must be stretched from its equilibrium position for 28 J of work to be done.
Two spherical conductors are connected by a long conducting wire and a total charge of 20.0 μC is placed on this combination. One sphere has a radius of 4.0 cm while the other has a radius of 6.0 cm. Explain the reasoning of the steps that allow you ..
A professor's office door is 0.9 wide, 2.2 high, 4.2 thick; has a mass of 23 , and pivots on frictionless hinges. A "door closer" is attached to door and the top of the door frame. while the door is open and at rest, the door closer exerts a torqu..
A person who weighs 684 N steps onto a spring scale in bathroom, and the spring compresses by 0.518 cm. (a) What is the spring constant? (b) What is the weight of another person who compresses spring by 0.328 cm.
A 50 kg pole vaulter running at 10 m/s vaults over the bar. if the vaulter's horizontal component of velocity over the bar is 1 m/s and air resistance is disregarded, how high was the jump.
An instructor wants to use a lens to project the real image of a light bulb onto a screen 1.23 m from the bulb. In order to get the image to be two times as large as bulb, what focal length lens will be required.
A long, narrow rectangular loop of wire is moving toward the bottom of page with a speed of 0.025 m/s. The loop is leaving a region in which a 2.1 T magnetic field exists; magnetic field outside this region is zero. All through the time of 1.0 s, wha..
Scientists plan to release a space probe that will enter the atmosphere of a gaseous planet. The temperature of the gaseous planet varies linearly with the height of the atmosphere.
Assume that when you ride on your 7.60-kg bike the weight of you and the bike is supported equally by the two tires. If the gauge pressure in the tires is 78.5 lb/in2 and the area of contact between each tire and the road is 7.13 cm2, what is your we..
The atomic mass of copper is 64 g/mole, and the density of copper is 8.9 g/cm3.
On a cold day, 16000 J of heat leaks out of a house. The inside temperature is 20.0° C, and the outside temperature is -18° C. What is the increase in the entropy of the universe that this heat loss produces?
A hiker, who weighs 919 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 4410 N, and rests on two concrete supports, one on each end. He stops 1/3 of the way along the bridge.
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