The maximum torque is exerted on a current loop when the plane of the loop is at what angle to the magnetic field?
A) 45.°
B) 0.°
C) 135.°
D) 90.°
E) -45.°
B
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How do astronomers measure the temperature of stars?
A. The inverse square law is used. B. By comparing the star's absolute and apparent brightness. C. The rate of change of the color of the star is measured. D. By looking at which absorption lines are present in the star's spectrum. E. Temperature is determined from the radius of the star that is measured by radar.
One of water's interesting thermal properties is that when heated it takes a relatively
A) long time in changing temperature. B) short time in changing temperature. C) same amount of time to cool. D) none of the above
Projectile Motion: A ball is thrown with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If we can neglect air resistance, what is the horizontal component of its instantaneous velocity at the exact top of its trajectory?
A. 10 m/s B. 17 m/s C. 20 m/s D. zero
The pregalactic blobs had masses similar to
A) dwarf galaxies. B) the Sun. C) the Earth. D) the Milky Way. E) open clusters of stars.