A factory siren indicating the end of a shift has a frequency of 80 Hz. What frequency is perceived by the occupant of a car traveling towards the factory at 30 m/s? The speed of sound in air is 343 m/s
A) 83 Hz
B) 85 Hz
C) 87 Hz
D) 89 Hz
E) 91 Hz
C
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What is the electric potential at the center of a hollow metal sphere of outside diameter 14. cm which holds a net charge of 3.3 ?C?
What will be an ideal response?
A bowling ball of mass 7.5 kg and radius 9.0 cm rolls without slipping 10 m down a lane at 4.3 m/s
(a) Calculate the angular displacement of the bowling ball. (b) Calculate the angular velocity of the bowling ball. (c) Calculate the centripetal acceleration of the bowling ball. (d) Calculate the tangential acceleration of the bowling ball.
In active galaxies, their central engines may be temporarily fed by
A) a sudden surge of star formation. B) a series of supernovae around the core. C) the sudden collapse of the core into a supermassive black hole. D) a close encounter with a neighbor galaxy. E) the fusion of helium into carbon in their cores.
A vertical cylindrical cylinder, closed at the bottom end, contains 0.0100 moles of gas
It is fitted at the top with a piston, which can move freely. The mass of the piston is 14.0 kg and the initial height of the piston above the bottom of the cylinder is 25 cm. What is the temperature of the gas? A) 290 K B) 413 K C) 3620 K D) 405 K E) 500 K