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A river descends 20 m through rapids. The speed of the water is 3.0 m/s upon entering the rapids and 11 m/s upon leaving. What percentage of the gravitational potential energy of the water-Earth system is transferred to kinetic energy during the descent? (Hint: Consider the descent of, say, 10 kg of water.)
Calculate the firm's earnings per share (EPS). Explain how large a per-share cash dividend did the firm pay on common stock during 2011?
A 0.15 kg particle moving to the left with a speed of 0.05 m/s, Determine the final velocity of each particle and the fraction of total energy transferred to the 0.27 kg particle
a slab of ice floats on a freshwater lake.part a what minimum volume must the slab have for a 40.0kg woman to be able
Playing near a road construction site, a child falls over a barrier and down onto a dirt slope that is angled downward at 42° to the horizontal, What is the coefficient of kinetic friction between the child and the slope
Two long, parallel wires carry currents of 0.245 A in the same direction. If the wires are 0.034 m apart, what is the force per unit length between the wires
A 270-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 34° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest?
The work function of sodium is 3.12 *10-19J. A sodium lamp emits yellow light with a wavelength of 590nm. Calculate the stopping potential of the electrons emitted from a sodium plate illuminated by a sodium lamp.
A boy has a height of 1 m and a mass of 20 kilogram. He drinks a magic potion and becomes a giant of 4 m in height (but retains his previous proportions). Determine what is his mass now
A small bag of sand is released from an ascending hot-air balloon whose upward constant velocity is v0 = 1.55 m/s. determine the time it takes the bag to reach the ground
A guitar string is 60 cmlong. The string has a mass of 1.8g and is under a tensionof 945N. Calculate the fundamental wavelength for this string
Consider an object on an incline where friction is present. The angle between the incline and the horizontal is ? and the coefficient of kinetic friction is ?k. Find an expression for the acceleration of this object
The two loudspeakers in the drawing are producing identical soundwaves. The waves spread out and overlap at thepoint P. This situation is analogous to Young’sdouble-slit experiment, except that sound waves are being used.
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