When bullets are fired from an airplane in the forward direction, the momentum of the airplane is
A) decreased.
B) unchanged.
C) increased.
Answer: A
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In an x-ray tube, high-speed electrons are slammed into a lead target, giving off x-rays. If the electrons are accelerated from rest through a potential difference of 160 000 volts, what speed do they have when they strike the target? (qe = 1.6 × 10^?19 C, me = 9.11 × 10^?31 kg, and c = 3.00 × 10^8 m/s)
a. 0.79c b. 0.65c c. 0.83c d. 0.49c e. 0.48c
Two identical particles, each with a mass of 4.5 mg and a charge of 30 nC, are moving directly toward each other with equal speeds of 4.0 m/s at an instant when the distance separating the two is equal to 25 cm. How far apart will they be when closest to one another?
a. 9.8 cm b. 12 cm c. 7.8 cm d. 15 cm e. 20 cm
A car is traveling along a highway at 65 mph. What is the linear speed of the bottom of the tires?
What will be an ideal response?
A student adds two displacement vectors that have the magnitudes of 12.0 m and 5.0 m. What is the range of possible answers for the magnitude of the resultant vector?
What will be an ideal response?