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291: A girl throws a 2 kilogram rock vertically upward. It reaches a maximum height of 5 meters. What is the kinetic energy of the rock the instant it leaves the girl's hand?
ANSWER: 100 JOULES (accept 98 joules)
292: A spring with a force constant of 20 Newton’s per meter is known to obey Hooke's Law. The spring is attached to a mass of 5 kilograms and placed on a horizontal, frictionless surface. The mass is displaced 3 meters from its equilibrium position and released. What is the kinetic energy of the mass as it passes through its equilibrium position?
ANSWER: 90 JOULES
293: The period of oscillation of a particle undergoing simple harmonic motion is:
w) Independent of the amplitude of the motion
x) Directly proportional to the frequency of oscillation
y) Independent of the frequency of oscillation
z) None of the above
ANSWER: W -- INDEPENDENT OF THE AMPLITUDE OF THE MOTION
294: The angle between the velocity and acceleration of a body is:
w) Never 90 degrees
x) Never 180 degrees
y) Sometimes 180 degrees
z) Never 0 degrees
ANSWER: Y -- SOMETIMES 180 DEGREES
295: In a collision, which of the following four quantities is always conserved?
w) Momentum
x) Kinetic energy
y) Torque
z) Moment of inertia
ANSWER: W -- MOMENTUM
296: Of the following terms, which is the product of force and time? Is it:
w) Impulse
x) Power
y) Energy
z) Work
ANSWER: W -- IMPULSE
297: In physics, a radian per second squared is a unit of:
w) Angular displacement
x) Angular velocity
y) Angular acceleration
z) Angular momentum.
ANSWER: Y -- ANGULAR ACCELERATION
298: At what centigrade temperature will 1 mole of a gas under 1atmosphere of pressure occupy 22.4 liters?
ANSWER: ZERO DEGREES CENTIGRADE
299: A pitcher throws a baseball to his first-base man. As the ball flies through the air, assuming no air resistance, what is the shape of its trajectory?
ANSWER: PARABOLA
300: Name the English physicist who discovered electromagnetic induction?
ANSWER: (MICHAEL) FARADAY
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