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(a) What is the efficiency of an out-of-condition professor who does 2.30 ? 105 J of useful work while metabolizing 500 kcal of food energy?
(b) How many food calories would a well-conditioned athlete metabolize in doing the same work with an efficiency of 20%?
Two satellites of the same mass are in circular orbits of differentradii above the Earth's equator. what is the ratio of the satellites angular momenta
An object, which has a height of 5.50 cm, is placed 22.0 cm in front of a plane mirror : What will be the position of the resulting image? What will be the height of the resulting image?
a meter stick is held vertically above your hand with the lower end between your thumb and first finger. on seeing the
Why does a capacitor act as a short circuit at high frequencies?
A spherical satellite with a radius of 75m is spinning over its own axis with an angular speed of 232rad/s. What is the angular momentum after the failure
How much force is the air exerting on the front cover of a book that is 23.9 cm long and 16.9 cm wide
Suppose a conducting rod is 48 cm long and slides on a pair of rails at 3.25 m/s. What is the strength of the magnetic field in T if a 6 V emf is induced
A proton (mass 1 ) is shot toward an unknown target nucleus at a speed of 2.75×106 . The proton rebounds with its speed reduced by 25 while the target nucleus acquires a speed of 3.01×105 . What is the mass, in atomic mass units, of the target nucleu..
Consider a cell phone that emits electromagnetic radiation with a frequency of 1.0 GHz and with a power of 70 W. What is the electric field amplitude at a distance 1020 m away from the phone
A 70.2 kg high jumper leaves the ground with a vertical velocity of 12 m/s. How high can he jump? The acceleration of gravity is 9.8 m/s2.
using a 699-nm wavelength laser you form the diffraction pattern of a 0.111-mm wide slit on a screen. you measure on
Two long parallel wires are shown in the figure below. They are separated by a distance L = 17.0 cm. The bottom wire carries a current of 7.10 A in the direction shown. The current of the upper wire is directed in the opposite direction.
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