A bit of matter that enters Earth's atmosphere and survives to reach the ground is called
a. a meteor.
b. a meteoroid.
c. a meteorite.
d. a minor planet.
e. an asteroid.
c
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A wave disturbance in which the displacement in the medium is parallel to the direction of travel of the wave is a
A. longitudinal wave B. transverse wave
Which statement about black holes is true?
A) Their event horizon is a physical surface boundary. B) Their main-sequence mass was 5-10 solar masses. C) They form from 1.4 solar mass stars. D) Their escape velocity is greater than the speed of light. E) They form an event horizon at twice the Schwartzschild radius.
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.The velocity
a. is zero. b. has its largest magnitude. c. points up. d. points down.
A girl throws a rock horizontally with a speed of 12 m/s from a bridge. It falls 2.28 s before hitting the water below. Neglect air resistance
(a) How high is the bridge from the water below? (b) How far horizontally does the rock travel before striking the water?