Centripetal force changes linear momentum but not angular momentum
a. True
b. False
Indicate whether the statement is true or false
True
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Two long parallel wires carry currents of 10 A in opposite directions. They are separated by 40 cm
What is the magnitude of the magnetic field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (?0 = 4? × 10-7 T ? m/A) A) 3.3 µT B) 1.5 µT C) 6.7 µT D) 33 µT E) 67 µT
A vertical wire carries a current vertically downward. To the east of this wire, the magnetic field points
A) north. B) east. C) south. D) down.
The longest-daylight day for people in the Southern Hemisphere at latitudes greater than 30°S occurs at the
a. summer solstice. b. vernal equinox. c. winter solstice. d. autumnal equinox.
Clouds that develop about 1000 meters above the ground are generally
A) cirrus and cirrocumulus type clouds. B) cumulus and stratus type clouds. C) cumulus and cirrocumulus type clouds. D) cirrocumulus and altocumulus type clouds.