When playing tennis, if you hit the ball off of the top end of the racket, an uncomfortable standing wave vibration is produced in the racket. This wave is
A. longitudinal.
B. transverse.
C. neither longitudinal nor transverse.
D. both longitudinal and transverse.
Answer: B
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Most extrasolar Neptunes and Jupiters found to date have
A) orbits very close to their parent stars, making them hot Neptunes and hot Jupiters. B) orbits that are more eccentric than those of planets in our solar system, with eccentricities greater than 0.1 C) orbits that are less eccentric than those of planets in our solar system, with eccentricities less than 0.01. D) much larger orbits than the jovian planets in our solar system.
An object is released from rest when it is a height h above the surface of a planet of mass M and radius R. What is the speed of the object just before striking the surface of the planet? Neglect any air resistance. Let h = 4.0 × 106 m, R = 5.0 × 106 m, and M = 4.0 × 1024 kg.
A. 7.8 km/s B. 3.5 km/s C. 5.4 km/s D. 6.9 km/s E. 4.8 km/s
An ideal Carnot engine operating between a warm reservoir of unknown temperature and a cold reservoir at has an efficiency of What is the temperature of the warm reservoir?
A) 1.98 K B) 0.180 K C) 157 K D) 0.160 K
A 5000-N force compresses a steel block by 0.0025 cm. How much force, applied over the same area, would be needed to compress the block by 0.0125 cm?
A) 25,000 N B) 2,500 N C) 1,000 N D) 5,000 N