A certain astronomical telescope has a diameter of 5.60 m. What is the minimum angle of resolution for this telescope when it is forming images using light of wavelength 620 nm?
A) 1.11 × 10-7 rad
B) 3.11 × 10-7 rad
C) 2.70 × 10-7 rad
D) 1.35 × 10-7 rad
E) 4.05 × 10-7 rad
D
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Nellie pulls with a force of 50 N on a horizontal rope tied to a tree at rest. The net force on the rope is
A) 50 N and rope tension is 0 N. B) 50 N and rope tension is also 50 N. C) zero and rope tension is 50 N. D) zero and rope tension is also zero.
The least energy required to produce forced vibration in an object occurs
A) below its natural frequency. B) at its natural frequency. C) above its natural frequency. D) none of the above
A ball is whirled on the end of a string in a horizontal circle at constant speed. Suddenly, the string breaks. Immediately after the string breaks, the ball will
A. have a horizontal velocity that is tangential to the circle. B. have no horizontal velocity. C. have a horizontal velocity toward the center of the circle. D. have a horizontal velocity partly in away from the center of the circle and partly tangent to the circle. E. have a horizontal velocity away from the center of the circle.
A star has a parallax of .05". Its distance is
A) 20 parsecs. B) 200 parsecs. C) 66 parsecs. D) 5 light-years. E) 660 light-years.