The law of poles states that like magnetic poles ______________ and unlike magnetic poles ______________
Fill in the blank(s) with correct word
repel; attract
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A basketball bounces off the floor. It is difficult to apply conservation of momentum usefully to the ball–earth system in this case because
A. The system is not isolated. B. A basketball does not bounce perfectly elastically. C. Air friction is significant. D. We can’t easily measure the earth’s velocity. E. The law doesn’t apply to contact interactions.
Calculate
Brown dwarfs are
A. objects massive enough to fuse deuterium but not massive enough to sustain hydrogen fusion. B. large terrestrial planets. C. very low-mass main sequence stars. D. what is left over after a massive star ejects most of its material through a supernova.
Doppler Effect: The sound from the whistle of a truck moving at 17.0 m/s toward a cliff reflects from the cliff and is heard by the driver of the truck. When it is parked at the side of the road, the whistle from the truck produces sound of frequency 2.267 kHz. As observed by the driver of the truck, what is the change in frequency the sound from the whistle due to the reflection? The speed of sound is 343 m/s.
A. 236 Hz B. 228 Hz C. 207 Hz D. 118 Hz E. 472 Hz