An elastic collision of two objects is characterized by the following
A) Total momentum of the system is conserved.
B) Total kinetic energy of the system remains constant.
C) Both A and B are true.
D) Neither A nor B are true.
C
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If the uncertainty in the position of a proton is 0.053 nm, what is the uncertainty in its speed? (h = 6.626 × 10-34 J ? s, mproton = 1.67 × 10-27 kg)
A) 2.2 m/s B) 0.60 km/s C) 1.2 km/s D) 0.98 km/s E) 37 m/s
Suppose you have a time-keeping device that always reads precisely 12:00 when the Sun crosses your meridian. What kind of time is this clock keeping?
A) mean solar time B) standard time C) apparent solar time D) universal time
Two 1.5-V batteries are inserted into a flashlight. The batteries are in series, with their positive terminals in the same direction. One battery has an internal resistance of 0.15 ?, and the other has an internal resistance of 0.20 ?. When the switch is closed, a current of 0.54 A passes through the flashlight bulb. What percent of the dissipated power is dissipated in the batteries?
a. 10.2% b. 6.3% c. 1.6% d. 1.9%
The six face-centered lattice points of a FCC lattice unit cell contribute ______________lattice point(s) to a unit cell.
Fill in the blank(s) with the appropriate word(s).