Equal charges, one at rest, the other having a velocity of 104 m/s, are released in a uniform magnetic field. Which charge has the largest force exerted on it by the magnetic field?
a. The charge that is at rest.
b. The charge that is moving, if its velocity is parallel to the magnetic field direction when it is released.
c. The charge that is moving if its velocity makes an angle of 45o with the direction of the magnetic field when it is released.
d. The charge that is moving if its velocity is perpendicular to the magnetic field direction when it is released.
e. All the charges above experience equal forces when released in the same magnetic field.
d
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The speed of FM waves will be observed to be c = 2.9979 × 10^8 m/s when the antenna emitting the waves is
a. at rest relative to the receiving antenna. b. moving to the right of the detecting antenna at 0.5c. c. moving to the left of the detecting antenna at 0.5c. d. moving as described in (a), (b) or (c) above. e. moving at 2.9979 × 10^8 m/s.
Which of the following statements about sidereal and solar days is not true?
A) A sidereal day is the definition of a day on the Earth and a solar day is the definition of a day on the Sun. B) A solar day is approximately 4 minutes longer than a sidereal day. C) A solar day is the amount of time between successive appearances of the Sun on our meridian. D) A sidereal day is the amount of time between successive appearances of any star on our meridian.
A jar filled with gas is placed directly in front of a second jar filled with gas. Using a spectroscope to look at one jar through the other you observe dark spectral lines. The jar closest to you contains
A) gas at the same temperature as the other jar. B) the hotter gas. C) gas at very high pressure. D) the cooler gas. E) the exact same gas as the other jar.
The ______________ surrounds the nucleus of a comet
Fill in the blank(s) with correct word