A person approaches a plane mirror at a speed of 3 m/s. How fast does he approach his image?
A) 3 m/s
B) 4 m/s
C) 5 m/s
D) 6 m/s
E) 7 m/s
D
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Assume that a uniform magnetic field is directed into this page. If an electron is released with an initial velocity directed from the bottom edge to the top edge of the page, which of the following describes the direction of the resultant force acting on the electron?
a. out of the page b. to the right c. to the left d. into the page
A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is a correct statement about this circuit?
A) The charge on the capacitor after one time constant is 1/e of its maximum value. B) The voltage on the capacitor after one time constant is 1/e of the maximum value. C) The voltage on this capacitor after one time constant is 100% of its maximum value. D) The charge on the capacitor after four time constants is about 98% of the maximum value. E) The charge on the capacitor after one time constant is 50% of its maximum value.
The rotation curve of a galaxy can be used to determine
a. the relative number of hot young stars in the galaxy. b. the relative amount of gas and dust in the galaxy. c. the radius of the galaxy. d. the luminosity of the galaxy. e. the mass of the galaxy.
As the rock in this figure falls after being dropped from a great height:
a. its speed increases until it reaches a constant value, but its acceleration decreases gradually to zero. b. its speed continues to increase while its acceleration goes to zero. c. both the speed and the acceleration increase. d. its speed decreases while its acceleration continues to increase. e. its speed slows to zero while its acceleration reaches a terminal value.