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Q. Water flows over Victoria Falls, which is high, at the average rate of kg/s. If one quarter the potential energy of this water were transformed to electric energy, how much power would be produced by these falls?
Q. A car starts from rest at a stop sign. It accelerates at 4 for 6.4, coasts for 1.5, and then slows down at a rate of 3.5 for next stop sign. How far apart are the stop signs?
A runner of mass m = 39kg and running at 3.1m/s runs as shown and jumps on the rim of a playground merry-go-round which has a moment of inertia of 372 kg•m2 and the radius of 2 meters. Assume the merry-go-round is initially at rest, what is its final..
Which state is best illustrates kinetic friction
A vertical scale on a spring balance reads from 0 to 160 N. The scale has a length of 12.5cm from the 0 to 160 N reading. A fish hanging from the bottom of spring oscillates vertically at the frequency of 2.30 Hz. ignoring the mass of the spring, wha..
How many electrons should be transferred from the plate. When you enter your answer, leave off the unit rm dB.
Compute the heat absorbed by the gas and work done by the gas during expansion.
What is the temperature of the outside air. What are the components of the displacement vector from camp to summit? What is its magnitude? select the x axis east, y axis north, and z axis up.
What speed limit should be posted for the curve. How long (in {rm ns}) does it take light incident vertical to the glass to pass through this 9.0 {rm cm}-thick sandwich.
A 51.0-g Super Ball traveling at 27.0 m/s bounces off a brick wall and rebounds at 21.5 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.75 ms,
Write down an expression for the efficiency of the air cart bumper in terms of the initial and final kinetic energy of the cart. What defines a collision as elastic or inelastic.
A Carnot engine operating with an ideal gas takes heat energy from the hot reservoir at 500 degrees C and exhausts heat energy to the cold reservoir at 250 degrees C. If the engine does 400J of work per cycle, what is its efficiency.
How far east of his starting point will he reach the opposite bank? What is the magnitude of his velocity relative to the earth.
A parallel beam of light from a He-Ne laser, with wavelength of 644 nm, falls on two very narrow slits 0.05 mm apart. How far apart are the fringes in the center of the pattern on a screen 2.2m away.
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