An electron follows a circular path (radius = 15 cm) in a uniform magnetic field (magnitude = 3.0 G). What is the period of this motion?
A. 0.12 ?s
B. 1.2 ms
C. 0.18 ?s
D. 1.8 ms
E. 1.8 ?s
Answer: A
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An object floats with half its volume beneath the surface of the water. The weight of the displaced water is 2000 N. What is the weight of the object? The density of water is 1000 kg/m3
A) 1000 N B) 4000 N C) 2000 N D) It cannot be determined because we do not know the volume of the object.
If the Sun ceased to generate nuclear fusion in its core, the Sun would immediately begin to collapse inward
a. True b. False Indicate whether the statement is true or false
The ________ planets are large bodies in the outer solar system with compositions like the Sun's
Fill in the blank(s) with correct word
A lens that is thicker at the center than the edges
a. is a converging lens. b. is a diverging lens. c. always forms a real image. d. always forms a virtual image. e. none of the above