A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
a. +2.0 J
b. +20 J
c. ?2.0 J
d. ?20 J
e. +40 J
d
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Suppose that the speed of an electron traveling 1.0 km/s is known to an accuracy of 1 part in 105 (i.e., within 0.01%). What is the greatest possible accuracy within which we can determine the position of this electron?
What will be an ideal response?
A man weighs 650 N while on the surface of Earth. If he is transported to the planet Mythos, which has the same mass as Earth but a radius that is five times larger than Earth's, his weight would be
A. 16,250 N. B. 26 N. C. 3,250 N. D. 130 N. E. 650 N.
Relativity dealing with gravitation is known as:
a. gravitational relativity. c. general relativity. b. Galilean relativity. d. inertial relativity.
The second law of thermodynamics
A. describes the state of a system. B. applies only when the first law is satisfied. C. precludes perpetual motion machines. D. does not apply to an isolated system.