The force due to gravity that acts on a block of ice that slides down an icy ramp
A) remains equal to mg at all angles.
B) decreases as the slope of the ramp increases.
C) becomes greatest when the ramp is vertical.
Answer: A
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When E and B are the amplitudes of the electric and magnetic fields in an electromagnetic wave in vacuum, the total average energy density in the wave is
A.
.B.
.C.
D.
.E.
.A buoy, used to mark a harbor channel, consists of a weighted rod 2.00 m in length. 1.50 m of the rod is immersed in water and 0.500 m extends above the surface
If sunlight is incident on the water with an angle of incidence of 40.0°, what is the length of the shadow of the buoy on the level bottom of the harbor?
You can add heat without raising temperature to
A) ice. B) boiling water. C) both of these D) neither of these
When radioactive decays are counted, the resulting counts vary because of their statistical nature although the experimental situation may be the same. If 106 counts are registered, the next measurement of an equivalent situation may be expected to typically vary by about how many counts?
A. 1 B. 100 C. 1000 D. 10,000 E. 100,000