A 2.4-kg ball falling vertically hits the floor with a speed of 2.5 m/s and rebounds with a speed of 1.5 m/s. What is the magnitude of the impulse exerted on the ball by the floor?
A.
sB.
sC.
sD.
sE.
sAnswer: A
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Consider two copper wires. One has twice the length of the other. How do the resistivities of these two wires compare?
A) The longer wire has twice the resistivity of the shorter wire. B) Both wires have the same resistivity. C) The longer wire has four times the resistivity of the shorter wire. D) The shorter wire has twice the resistivity of the longer wire.
A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. A mass of 423 g is attached to the free end of the string
With the string vertical and taut, the mass is gently released so it can descend under the influence of gravity. As the mass descends, the string unwinds and causes the pulley to rotate, but does not slip on the pulley. What is the speed of the mass after it has fallen through 1.25 m? A) 2.00 m/s B) 2.28 m/s C) 1.97 m/s D) 3.94 m/s E) 4.95 m/s
The term terminator refers to the boundary line dividing day and night on the surface of a planet or moon. In this experiment, it is the line between the bright and dark side of the Moon. State the phase of the Moon when the terminator is the (a) sunrise line, (b) sunset line
Answer the following statement(s) true (T) or false (F)
1. In the empty region between the plates of a charging capacitor, we must observe some kind of nonuniform magnetic field.
2. In a certain region of empty space, 
= 0 and is constant in time. Assume that the magnetic field in that region is unidirectional (everywhere points in the same direction). Such a field must also be uniform