An automobile of mass 2000 kg moving at 20 m/s is braked suddenly with a constant braking force of 10,000 N. How far does the car travel before stopping?
a. 40 m
c. 120 m
b. 80 m
d. 160 m
A
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The heat capacity is also known as the molar specific heat.
Fill in the blank(s) with the appropriate word(s).
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are positive, its angular velocity is positive, and its angular acceleration is negative. The sphere is
A. rotating clockwise and slowing down. B. rotating counterclockwise and slowing down. C. rotating clockwise and speeding up. D. rotating counterclockwise and speeding up. E. first rotating clockwise and then counterclockwise.
Two identical concentric loops are arranged as shown in the diagram below. Loop 1 initially carries a steady current driven by the power supply shown, will the two loops briefly attract or repel each other as the current in loop 1 decays to zero? 
Suppose that when we turn off the power supply, it takes a small but finite time for the current to decay to zero in loop 1. In what direction does the current induced in loop 2 flow during this time interval?
A. They attract each other. B. They repel each other. C. They neither attract nor repel each other. D. One needs more information to answer.
Astronomers have begun to build instruments to detect "cosmic messengers" that are not forms of light, such as neutrinos, cosmic rays, and gravitational waves, because they
A) provide information about distant objects that we cannot obtain from light. B) provide higher angular resolution than we can obtain with light. C) are unaffected by the turbulence of Earth's atmosphere. D) can allow us to see beyond the horizon of the observable universe.