A__________is a quantum of electromagnetic energy that carries an amount of energy that depends inversely on its wavelength
A) wave
B) photon
C) grating
D) fringe
B
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Which of the following represents the smallest range of temperatures?
A) 50-100° Kelvin B) 50-100° Celsius C) 50-100° Fahrenheit D) They all represent the same range in temperature.
A large piece of debris that only partially burns up in the atmosphere, leaving a fragment to hit the surface, is called a
A) meteor B) hail stone C) meteorite D) meteoroid
A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground
Neglect air (a) How far from where the child is standing does the ball hit the ground? (b) How long is the ball in flight before it hits the ground? (c) What is the magnitude of the ball's velocity just before it hits the ground?
A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the minimum distance, on the other side of the pivot, such that a 220-N force will make the child lift off the ground?
A) 2.4 m B) 0.10 m C) 1.5 m D) 9.8 m E) 1.0 m