An object that is initially at rest breaks up into two pieces of unequal masses when a spring-loaded device is released
If you compare the kinetic energy of the larger mass to that of the smaller mass immediately after they separate, which of the following statements is correct? A) The kinetic energy of the larger mass is greater.
B) The kinetic energy of the smaller mass is greater.
C) The kinetic energies of the two masses are equal.
D) The total kinetic energy is zero J.
B
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Characteristics of Waves: A fisherman fishing from a pier observes that the float on his line bobs up and down, taking 2.4 s to move from its highest point to its lowest point. He also estimates that the distance between adjacent wave crests is 48 m. What is the speed of the waves going past the pier?
A. 1.0 m/s B. 20 m/s C. 10 m/s D. 5.0 m/s E. 120 m/s
All waves have in common a
A) pattern. B) vibrating source. C) variable regions of high and low pressure. D) none of the above
A 0.40-kg particle moves under the influence of a single conservative force. At point A where the particle has a speed of 10 m/s, the potential energy associated with the conservative force is +40 J. As the particle moves from A to B, the force does +25 J of work on the particle. What is the value of the potential energy at point B?
a. +65 J b. +15 J c. +35 J d. +45 J e. ?40 J
A coil is placed in a changing magnetic field and an emf is induced. What happens to the induced emf if the rate of change of magnetic field doubles?
a. The emf quadruples. c. There is no change. b. The emf increases by a factor of 16. d. The emf doubles.