A meter stick with a mass of 89.5 g is being supported at the 50.0 cm mark by a pivot that is 1.00 cm above the center of mass of the meter stick. The moment of inertia of the stick about that point is 0.00746 kg?m2
What is the period of oscillation of this system? A) 2.01 s
B) 2.41 s
C) 5.79 s
D) 2.89 s
E) 4.02 s
C
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Relative to a stationary observer, a moving object
A) appears shorter than normal. B) appears longer than normal. C) keeps its same length. D) can do any of the above. It depends on the relative velocity between the observer and the object. E) can do any of the above. It depends on the relative energy between the observer and the object.
Matter Waves: What is the wavelength of the matter wave associated with a 0.50-kg ball moving at 25 m/s? (h = 6.626 × 10-34 J ? s)
A. 3.5 × 10-35 m B. 5.3 × 10-35 m C. 3.5 × 10-33 m D. 5.3 × 10-33 m
The reason that most extrasolar planets discovered by the Doppler technique are found close to their parent stars is
A) the closer to a star, the hotter and therefore brighter the planet is. B) more of the starlight is blocked by the planet when it transits the star. C) planets that are close to a star are heated up and therefore larger. D) they transit more frequently, and have thus been more likely to be detected in the short time we have been searching for them. E) the wavelength shift of the star's spectrum is larger.
How much energy would be released if 2.0 kg of material was lost during a reaction?
A) 1.8 × 1017 J B) 1.5 × 1016 J C) 2.4 × 10-17 J D) 6.0 × 108 J E) 4.7 × 10-8 J