Mercury presents the same side to the Sun:
A) every other orbit.
B) all the time, just like our Moon.
C) every 12 hours.
D) every third orbit.
E) twice every orbit.
A
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A fundamental rule of electricity is that
A) like kinds of charges repel. B) unlike kinds of charges attract. C) both of these D) neither of these
Conversion of Units: An American football field, including end zones, is 360 feet long and 160 feet wide. If you needed to describe it for someone in Europe using the metric system, which one of the following quantities would be closest to its area in square meters? (2.54 cm = 1.00 in.)
A. 4920 m2 B. 5350 m2 C. 88.0 m2 D. 12,100 m2 E. 13,200 m2
When is the angular momentum of a system constant?
A) Only when its total kinetic energy is constant. B) Only when the linear momentum and the energy are constant. C) Only when no net external torque is exerted on the system. D) Only when the moment of inertia is constant.
A particle with a charge of +4.0 ?C has a mass of 5.0 g. What magnitude electric field directed upward will exactly balance the weight of the particle?
A) 4.1 × 104 N/C B) 8.2 × 104 N/C C) 4.4 × 104 N/C D) 1.2 × 104 N/C E) 5.1 × 104 N/C