A charge q = 3 × 10-6 C of mass m = 2 × 10-6 kg, and speed v = 5 × 106 m/s enters a uniform magnetic field. The mass experiences an acceleration a = 3 × 104 m/s2
What is the minimum magnetic field that would produce such an acceleration? A)
0.1 T
B)
0.004 T
C)
0.001 T
D)
0.01 T
E)
0.04 T
B
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At the summer solstice in June, at what latitude is the sun directly overhead at solar noon?
A. 0.0
(the equator)
B. 23.5
N
C. 23.5 S
D. 66.5 N
E. 40.0N
The phase of the Moon on a particular night is determined by
a. the season of the year. b. the speed of the Moon in is orbit. c. the relative positions of the Sun, Earth, and Moon. d. how the Earth's shadow hits the Moon. e. the distance from the Earth to the Moon.
The half-life of a muon is 2.2 ?s. How fast is it moving relative to an observer who says its half-life is 4.4 ?s?
a. 0.87c b. 0.75c c. 0.97c d. 0.72c e. 0.50c
The bottom of a flat–bottomed aluminum boat has an area of 4.0 m2, and the boat's mass is 120 kg. When set afloat in water, how far below the water surface is the boat bottom? (water density = 1.0 × 10^3 kg/m3)
a. 0.060 m c. 0.030 m b. 0.015 m d. 0.075 m