An ideal solenoid having a coil density of 5000 turns per meter is 10 cm long and carries a current of 4.0 A. What is the strength of the magnetic field at its center?
A) 13 mT B) 3.1 mT C) 6.2 mT D) 25 mT
D
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A 3.00 kg pendulum bob on a string 2.00 m long is released with a velocity of 2.00 m/s when the support string makes an angle of 45.0 degrees with the vertical. What is the tension in the string at the highest point of its motion?
A. 12.5 N B. 17.8 N C. 21.4 N D. 28.9 N E. 31.6 N
Because of time dilation, if a twin goes on a trip in a high-speed rocket ship, when she returns home she will be younger than her twin sister who did not go on the trip
a. True b. False Indicate whether the statement is true or false
Surface tension of liquids
A) increases when wetting agents are added. B) decreases as the liquid temperature increases. C) is about the same for all liquids. D) results from a thin molecular membrane beneath the liquid surface. E) keeps steel ships afloat.
You throw a golf ball at a massive bowling ball at rest and the golf ball bounces backward from it. After the bounce, compared with the golf ball, the bowling ball has more
A) momentum, but less kinetic energy. B) kinetic energy, but less momentum. C) momentum and more kinetic energy. D) less momentum and less kinetic energy. E) not enough information