The longest-daylight day for people in the Northern Hemisphere at latitudes greater than 25°N occurs when the noon Sun is overhead at the
a. Greenwich meridian.
b. Tropic of Cancer.
c. equator.
d. Tropic of Capricorn.
b
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What is the magnetic force on a 2.0-m length of (straight) wire carrying a current of 30 A in a region where a uniform magnetic field has a magnitude of 55 mT and is directed at an angle of 20° away from the wire?
A. 1.5 N B. 1.3 N C. 1.1 N D. 1.7 N E. 3.1 N
Ultrasound is used
a. to form images of internal organs. b. by bats to navigate. c. in automatic focus cameras. d. to control insects. e. all of the above
Materials having resistance changes as voltage or current varies are called:
a. ohmic. b. inohmic. c. nonohmic. d. deohmic.
A 1000-kg car traveling at 70 m/s takes 3 m to stop under full braking. The same car under similar road conditions, traveling at 140 m/s, takes ______________ m to stop under full braking
a. 6 b. 1 c. 3 d. 12 e. 11