How are speed and velocity related?
a. Speed and velocity are the same.
b. Velocity relates to instantaneous speed, but not to average speed.
c. Velocity specifies both the speed and the direction of a moving object.
d. Velocity relates to very small objects, such as atoms, while speed relates large objects such as cars.
e. Velocity is the scientific and technical word for speed.
c
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Inelastic Collisions: A 2200-kg auto moving northward at 12.0 m/s runs into a 3800-kg truck which is also moving northward, but at 5.00 m/s. If the vehicles lock bumpers, how fast are they moving just after the collision?
Fill in the blank(s) with the appropriate word(s).
An east-facing loop carries a counterclockwise current as viewed from the east. Suppose we place this loop in a uniform magnetic field pointing vertically upward. The loop is free to rotate around any axis. How will the loop respond to the magnetic field?
A. When viewed from above, the loop will twist 90° clockwise to face south. B. When viewed from above, the loop will twist 90° counterclockwise to face north. C. When viewed from the south, the loop will twist 90° clockwise to face downward. D. When viewed from the south, the loop will twist 90° counterclockwise to face upward. E. The loop is not affected by the field.
An educated scientific guess is a
A) hypothesis. B) theory. C) either of these D) neither of these
Two-Source Interference of Sound: A person stands between two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is 1.65 m from one speaker and 4.95 m from the other. What type of interference does the person perceive?
A. constructive B. destructive C. both constructive and destructive D. neither constructive nor destructive