Which of the following is not a feature of the Sun's
surface?
a) sunspots.
b) prominences.
c) flares.
d) rills.
d
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The perpendicular distance from the center of curvature to a spherical mirror is called
A) the center of curvature. B) the radius of curvature. C) the focal length. D) the perpendicular axis. E) twice the radius of curvature.
Suppose that a car traveling to the west (-x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration must be correct?
A) Its acceleration is decreasing in magnitude as the car slows down. B) Its acceleration is positive. C) Its acceleration is negative. D) Its acceleration is zero.
Arcturus has an mV = –0.04 and MV = –0.3 . Its distance is 10^–3.4 pc
a. True b. False Indicate whether the statement is true or false
When different resistors are connected in parallel across an ideal battery, we can be certain that
A) the same current flows in each one. B) their equivalent resistance is equal to the average of the individual resistances. C) the power dissipated in each is the same. D) the potential difference across each is the same. E) their equivalent resistance is greater than the resistance of any one of the individual resistances.