A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is the
A) air resistance on the ball.
B) weight of the ball.
C) force that the ball exerts on the bat.
D) grip of the player's hand against the ball.
E) weight of the bat.
Answer: C
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Differentiation is a process by which
A) denser materials like iron sank to the center of the Earth while less dense materials like rock rose to the surface B) the Earth's surface separated into continents and oceans C) convection mixed up the materials in the interior of the Earth D) less dense materials like rock sank to the center of the Earth while denser materials like iron rose to the surface
Relative Velocity: A pickup truck moves at 25 m/s toward the east. Ahmed is standing in the back and throws a baseball in what to him is the southwest direction at 28 m/s (with respect to the truck). A person at rest on the ground would see the ball moving how fast in what direction?
What will be an ideal response?
A proton with initial kinetic energy KE is moving in circular motion in a uniform magnetic field. When it has completed one eighth of a revolution, what is its kinetic energy?
a. 1.4KE b. 0.71KE c. KE d. The value is not given.
A simple ac circuit consists of an inductor connected across the terminals of an ac power source. If the frequency of the ac source is decreased by a factor of four, what happens to the reactance of the inductor?
A) It increases by a factor of eight. B) It decreases by a factor of four. C) It increases by a factor of four. D) It increases by a factor of two. E) It decreases by a factor of eight.