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1. 70-kg astronaut is loaded so heavily with equipment that on Earth he can jump only to a height of 10 cm. How high can he jump on the moon? ( As in the lecture, assume that the force generated by the legs is twice the unloaded weight of the person.)
You are in the neighborhood of a star (radius of 700,000 kilometers) which has emitted so many protons ("solar wind") during its life, What power must the engines of the probe use in order to maintain the orbit
A rocket, away from all gravitational forces, accelerates upward at an acceleration of 12.8m/s^2. On its main deck is a crate with a mass of 81.6kg. How many forces act on the crate
A capacitor is consists of two short sections of parallel wires in air. One wire is found to be of the voltage of 56 V, What is the capacitance of the two wires
The balloon is filled with helium at a density of 0.181 kg/m3. At this density the balloon is spherical with a radius of 0.400 m. If the filled balloon is fastened to a vertical line,
In one cycle, a freezer uses 780J of electrical energy in order to remove 1730J of heat from its freezer compartment at 10.0 oF. What is the coefficient of performance of this freezer
Two uniform, solid disks are rotating freely about the same axis. Then they are linked together without the aid of any external influences. Before being connected.
If a heat engine is operating at a coefficient of performance of 2.50 and 3.00 J of heat is absorbed from the surroundings, determine the magnitude of heat expelled.
Review Conceptual Example 7 as background for this problem. Determine the magnitude of the momentum of each photon
One day the brakes fail just as the cable car leaves the top on its downward journey. What is the runaway car's speed at the bottom of the hill
A thin spherical shell of mass 4.00 kg and diameter 0.200 m is filled with helium (density ? = 0.180 kg/m3). How long will it take for the top of the shell to reach the water surface
A 74 trampoline artist jumps vertically upward from the top of a platform with a speed of 5.0 m/s. How can I find how much he depresses it if there is a spring constant of 6.2*10^4.
A baseball is thrown from the roof of 20.4m -tall building with an initial velocity of magnitude 13.9m/s, What is the speed of the ball just before it strikes the ground
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