Force on a Moving Charge: A proton, moving east, enters a magnetic field. Because of this magnetic field the proton curves downward. We may conclude that the magnetic field must have a component
A. towards the south.
B. towards the north.
C. towards the west.
D. upward.
E. downward.
Answer: A
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For uniformly accelerated motion, which of the following quantities must be zero?
a. the initial acceleration b. the initial velocity c. the initial displacement d. the time rate of change of the acceleration e. the time rate of change of the velocity f. the time rate of change of the displacement
Approximately how much air is in a column 1-cm2 in cross section that extends from sea level to the top of the atmosphere?
A) 1 gram B) 1 kg C) 10 kg D) 100 kg
An LCR circuit has resistance R0, inductance L0, and capacitance C0 . If the resistance value is now tripled, which values of inductance and capacitance will result in the same resonant frequency as before?
a. 3L0, C0 b. L0/3, C0/3 c. 3L0, 3C0 d. 3L0, C0/3
The length and width of a rectangle are 1.125 m and 0.606 m, respectively. Multiplying, your calculator gives the product as 0.68175. Rounding properly to the correct number of significant figures, the area should be written as
A) 0.7 m2. B) 0.68 m2. C) 0.682 m2. D) 0.6818 m2. E) 0.68175 m2.