What idea of Aristotle’s did Galileo discredit with his experiments on balls rolling on an incline?
Answer: Force is necessary to maintain motion.
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An angle of 1 arcsecond is
A) about the width of your fist held at arm's length. B) about the width of a finger held at arm's length. C) less than the thickness of a human hair held at arm's length. D) slightly more than the width of a basketball held at arm's length.
Camera Optics: The focal length of the lens of a simple digital camera is 40 mm, and it is originally focused on a person 25 m away. In what direction must the lens be moved to change the focus of the camera to a person 4.0 m away?
A. It does not make any difference. B. sideways from the CCD sensors C. away from the CCD sensors D. towards the CCD sensors
A ball is tied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00 m making 7.00 revolutions every 10.0 seconds. What is the magnitude of the acceleration of the ball?
A) 67.9 m/s2 B) 38.7 m/s2 C) 29.3 m/s2 D) 14.8 m/s2 E) 74.2 m/s2
How much thermal energy is required to raise the temperature of a 225-g lead ball from 15.0°C to 25.0°C? The specific heat of lead is 128 J/kg ? K
A) 725 J B) 576 J C) 145 J D) 217 J E) 288 J