A solenoid of length 0.700 m having a circular cross-section of radius 5.00 cm stores 6.00 µJ of energy when a 0.400-A current runs through it. What is the winding density of the solenoid?
A) 865 turns/m
B) 472 turns/m
C) 1080 turns/m
D) 104 turns/m
E) 327 turns/m
Answer: D
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The Planck length is the length at which
A) strong nuclear force effects between quarks are expected to become important. B) electric charge becomes a meaningless concept. C) quantum gravitational effects are expected to become important. D) quarks are expected to be squeezed out of existence. E) photons acquire mass and move slower than lightspeed.
When charging two objects by rubbing them together
a. Neither may be a conductor. b. They must be made of different material. c. They will sometimes end up with both being positively charged. d. The heat produced by friction is a necessary part of this process.
Lonnie pitches a baseball of mass 0.15 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the ball for 0.050 s, what is the impulse experienced by the ball?
a. 360 N•s c. 400 N•s b. 20 N•s d. 15 N•s
Explain how sonar is used to locate underwater objects
What will be an ideal response?