A 4.00 kg ball is traveling at 3.00 m/s and strikes a wall. The 4.00 kg ball bounces off the wall with a velocity of 4.0 m/s. If the contact with the wall by the ball lasts for 0.10 seconds, then the average force on the ball is
A. 230 N.
B. 280 N.
C. 320 N.
D. 360 N.
E. 400 N.
B. 280 N.
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When high-mass stars dies, they explode as supernovae, leaving behind a
A) white dwarf B) neutron star or black hole C) brown dwarf D) red dwarf
The radius of the Sun is 6.95 × 108 m. It radiates heat at the rate of 5.32 x 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of the Sun? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4)
A) 6.27 × 103 K B) 8.25 × 103 K C) 8.87 × 103 K D) 3.93 × 107 K E) 5.78 × 107 K
A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
A. 8 × 10?5 W/m2 B. 8 × 10?6 W/m2 C. 3 × 10?3 W/m2 D. 0.8 W/m2 E. 2.5 × 10?5 W/m2
Which of these are effects of the Doppler shift?
A. When an object accelerates, the wavelengths of its light get warmer. B. When an object is moving toward us, the wavelengths of its light decrease. C. When an object slows, the wavelengths of its light get cooler. D. When an object is moving away from us, the frequencies of its light increases.