An object is attached to a spring, and its frequency of oscillation is measured. Then another object is connected to the first object, and the resulting mass is nine times the original value. By what factor is the frequency of oscillation changed?
a. 9
c. 1/3
b. 3
d. 1/9
C
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A coil with a self-inductance of 0.90 mH experiences a constant current buildup from zero to 15 A in 0.65 s. What is the induced emf during this interval?
a. 8.78E–3 V b. 2.08E–2 V c. 8.78E+2 V d. 2.56E–2 V e. 2.31E–2 V
Joe and Bill are playing tug-o-war. Joe is pulling with a force of 200 N. Bill is simply hanging on to the rope. Neither person is moving. What is the tension of the rope?
A) 200 N B) 400 N C) 0 N D) 300 N
An observer on Earth's equator would find
a. Polaris directly overhead. b. Polaris 40° above the northern horizon. c. Polaris on the northern horizon. d. the celestial equator passing directly overhead. e. that the ecliptic coincides with the horizon.
Other than radioactive decay, how can energy be released from the nucleus?
A) Nuclear fission. B) Nuclear fusion. C) Both of the above. D) Thermal decay. E) All of the above.