According to the Bohr theory, the probability of finding a hydrogen atom's ground-state electron 0.053 nm from the proton is
a. low, but not zero.
b. 100%.
c. zero.
d. high, but not 100%.
b
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A 5.0-kg mass with an initial velocity of 4.0 m/s, east collides with a 4.0-kg mass with an initial velocity of 3.0 m/s, west. After the collision the 5.0-kg mass has a velocity of 1.2 m/s, south. What is the magnitude of the velocity of the 4.0-kg mass after the collision?
a. 2.0 m/s b. 1.5 m/s c. 1.0 m/s d. 2.5 m/s e. 3.0 m/s
Polymers have a lower surface energy than metals and ceramics do, because at the polymer surface the _____________ bonds between LCMs are broken.
Fill in the blank(s) with the appropriate word(s).
A diverging lens produces an image of a real object. This image is
a. reduced, upright, and virtual. b. enlarged, inverted, and real. c. reduced, inverted, and virtual. d. enlarged, upright, and real. e. enlarged, upright, and virtual.
An elevator of mass 500 kg is caused to accelerate upward at 3.0 m/s2 by a force in the cable. What is the force exerted by the cable?
A. zero B. 1,500 N C. 2,900 N D. 6,400 N E. 4,900 N