What force(s) are responsible for the collapse of an interstellar cloud?
a. nuclear
b. gravity
c. electric
d. magnetic
e. both c and d
B
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An object hits a wall and bounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energy?
A) 1/2 B) 1/4 C) 2 D) 4 E) 8
Which of the following books of tabulated predicted planet positions was not based on uniform circular motion?
a. the Rudolphine Tables by Kepler b. the Prutenic Tables based on Copernicus' model c. the Alphonsine Tables based on Ptolemy's observations and calculations
A 400-turn circular coil (radius = 1.0 cm) is oriented with its plane perpendicular to a uniform magnetic field which has a magnitude that varies sinusoidally with a frequency of 90 Hz. If the maximum value of the induced emf in the coil is observed to be 4.2 V, what is the maximum value of the magnitude of the varying magnetic field?
a. 59 mT b. 62 mT c. 65 mT d. 68 mT e. 31 mT
The graph below shows the velocity versus time graph for a ball. Which explanation best fits the motion of the ball as shown by the graph?
a.
The ball is falling, is caught, and is thrown down with greater velocity.
b.
The ball is rolling, stops, and then continues rolling.
c.
The ball is rising, hits the ceiling, and falls down.
d.
The ball is falling, hits the floor, and bounces up.
e.
The ball is rising, is caught, and then is thrown down.