When three vectors are added graphically and form a closed triangle, the largest enclosed angle between any two of the vectors cannot be greater than
a. 60°.
b. 90°.
c. 180°.
d. No maximum exists.
c
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The study of the structure and evolution of the Universe is called ________.
A. archaeology B. cosmology C. astrology D. anthropology
Coulomb's Law: Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude F due to the other. With time, charge gradually diminishes on both spheres by leaking off. When each of the spheres has lost half its initial charge, what will be the magnitude of the electrostatic force on each one?
A. 1/16 F
B. 1/8 F
C. 1/4 F
D. 1/2 F
E. 1/
F
As a moon in a very elliptical orbit moves closer to and then farther from a planet, gravity flexes the moon with tides, and friction heats the interior. This process is referred to as
a. tidal heating. b. occultation. c. vaporization. d. differentiation. e. sublimation.
Rotational Dynamics: In a laboratory experiment, a student brings up the rotational speed of a flywheel to 30.0 rpm. She then allows it to slow down on its own, and counts 240 revolutions before the apparatus uniformly comes to a stop. The moment of inertia of the flywheel is 0.0850 kg ? m2. What is the magnitude of the retarding torque on the flywheel?
A. 0.0425 N ? m B. 0.159 N ? m C. 0.0787 N ? m D. 0.000278 N ? m E. 0.0000136 N ? m