Rotational Kinetic Energy: Two uniform solid balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down a high incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?
A. The small sphere arrives first.
B. Both reach the bottom at the same time.
C. The large sphere arrives first.
Answer: B
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A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground
The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?
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.
Mass on a Spring: A block attached to an ideal spring of force constant (spring constant) 15 N/m executes simple harmonic motion on a frictionless horizontal surface. At time t = 0 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s2. The mass of the block is closest to
A. 2.3 kg B. 2.6 kg C. 4.7 kg D. 9.4 kg
The gravitational collapse of an interstellar cloud can be triggered by a collision with another cloud.
Answer the following statement true (T) or false (F)