A pendulum bob of mass m is set into motion in a circular path in a horizontal plane as shown in the figure. The square of the angular momentum of the bob about the vertical axis through the point P is
A. m2gl3 sin4?/cos ?
B. m2gl3 sin3?/cos ?
C. m2gl3 sin2?/cos ?
D. m2gl3 sin ?/cos ?
E. m2gl3 sin2?
Answer: A
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A popular end for many cartoon characters is to fall into a "bottomless pit" in which the unfortunate character will fall forever. Consider the space shuttle in orbit around the Earth
Argue that there is a strong analogy between the cartoon "bottomless pit" and the orbital motion of the shuttle.
Atomic physics deals mainly with phenomena involving which particles in atoms?
a. Quarks b. Protons c. Electrons d. Neutrons
In order to turn a star's proper motion into its space velocity, we must also know
A) its mass and spectral type. B) its temperature and age. C) its distance and radial velocity. D) its distance and mass. E) its spectral type and period of rotation.
Four unequal resistors are connected in a parallel with each other. Which one of the following statements is correct about this combination?
A) The equivalent resistance is less than that of the smallest resistor. B) The equivalent resistance is equal to the average of the four resistances. C) The equivalent resistance is midway between the largest and smallest resistance. D) The equivalent resistance is more than the largest resistance. E) None of the other choices is correct.