When a bar magnet is thrust into a coil of copper wire, the coil tends to
A) attract the magnet as it enters.
B) repel the magnet as it enters.
C) both of these
D) neither of these
Answer: B
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Resolution: 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
Which of the following is NOT a property of a pulsar?
A) period of 1.34 seconds B) over time, the period is gradually increasing C) emissions only in the visible part of the spectrum D) each pulse consisting of a 0.01 second burst of radiation E) time interval between pulses is very uniform
A person walks toward a plane mirror at 2.0 ft/s. She is approaching her image in the mirror at a speed of
A) 1.0 ft/s. B) 3.0 ft/s. C) 2.0 ft/s. D) 4.0 ft/s. E) 5.0 ft/s.
A rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle of 53° above the horizontal. The rock strikes the ground a horizontal distance of 25 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How tall is the building?
a. 25.3 m b. 29.6 m c. 27.4 m d. 23.6 m e. 18.9 m