A boxer punches a sheet of paper in midair from rest to a speed of 40 m/s in 0.05 s. If the mass of the paper is 0.01 kg, the force of the punch on the paper is
A) 0.08 N.
B) 0.8 N.
C) 8.0 N.
D) 80 N.
Answer: C
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A typical "shooting star" during a meteor shower is caused by a ________ entering Earth's atmosphere.
A) boulder-size particle from an asteroid B) boulder-size particle from a comet C) pebble-size particle from an asteroid D) pebble-size particle from a comet E) microscopic particle of interstellar dust
A hologram is simply a
A) complex diffraction grating. B) thin sheet of non-cubic transparent crystals. C) pair of semi-crossed polarization filters. D) thin photographic film with microscopic images over the entire surface. E) none of the above
An L-shaped beam is loaded as shown in the figure. The bending moment at the midpoint of span AB is approximately:
(A) 6.8 kN?m
(B) 10.1 kN?m
(C) 12.3 kN?m
(D) 15.5 kN?m
The rate of flow of electric charge is measured in units called ______________
Fill in the blank(s) with correct word