Which of the following is a form of electrical potential energy?
A) coal
B) energy coming to your house from power companies
C) energy from the Sun
D) light from a fluorescent bulb
E) moving blades on an electric mixer
B
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Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2sin(?x)cos(3?t), where x is in m and t is in s. What is the distance (in m) between the first two antinodes?
A. 8 B. 2 C. 4 D. 1 E. 0.5
Coherent sources of light have a varying phase difference
Indicate whether the statement is true or false
A cup that is 6.0 cm tall is in front of a concave lens. The image of the cup is 2.5 cm tall and 7.5 cm from the lens. What is the focal length of the lens?
A) -6.0 cm B) -7.5 cm C) -13 cm D) +18 cm E) +6.0 cm
An automobile air bag
a. increases the contact time in stopping a person. b. reduces the impact force in a collision. c. increases the surface area of the impact force. d. does all of the above.