A wave disturbance in which the displacement in the medium is perpendicular to the direction of travel of the wave is a
A. longitudinal wave
B. transverse wave
B. transverse
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An aluminum rod is 20.0 cm in length, has a diameter of 10.0 mm and is at a temperature of 20
The coefficient of linear expansion of aluminum is 
If the temperature changes to 50
then the increase in diameter of the aluminum rod is
A. 
B. 
C. 
D. 
E. 
By observing gas clouds orbiting the centers of galaxies, we have learned that galaxies are made mostly of dark matter. In these observations
A) the light from the gas clouds is obscured by some unseen material. B) the low speeds of the gas clouds show that they are being slowed by some unseen material. C) the high speeds of the gas clouds show that they are being pushed by some unseen material. D) the low speeds of the gas clouds show that they are gravitationally attracted to the center by unseen material. E) the high speeds of the gas clouds show that they are gravitationally attracted to the center by unseen material.
If 5.0 × 10^21 electrons pass through a 20-? resistor in 10 min, what is the potential difference across the resistor?
a. 21 V b. 32 V c. 27 V d. 37 V e. 54 V
As a projectile thrown upward at a non-vertical angle moves in a parabolic path, as in the figure, at what point along its path are the velocity and acceleration vectors for the projectile perpendicular to each other?