The Palomar reflecting telescope has a parabolic mirror with an 80-m focal length. What is the magnification achieved when an eyepiece of focal length 5.0 cm is used?
a. 1200
c. 3200
b. 800
d. 1600
D
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You have discovered a new asteroid, which has a moon in an elliptical orbit around it
From a series of observations, you establish that the closest approach occurs when the moon is 51,000 m from the asteroid, the furthest separation is 102,000 m, and the speed of the moon at the point of closest approach is 7.50 m/s. What is the mass of the asteroid? G = 6.67 x 10-11 N•m2/kg2.A) 4.25 × 1016 kg B) 9.87 × 1016 kg C) 3.22 × 1016 kg D) 2.04 × 1016 kg E) 5.05 × 1016 kg
In order to tell time at night, the ancient Egyptians of 3000 B.C. used
A) sundials, with light provided by the Moon. B) water clocks, measuring the flow of water through an opening. C) hourglasses, measuring the flow of sand through an opening. D) Moon clocks, which measured time based on the Moon's position relative to the stars. E) star clocks, which measured time based on the positions of stars at particular times of night and particular times of year.
Which graph shows an object moving with a constant non-zero velocity?
GRAPH A
GRAPH B
GRAPH C
The magnetic compass in an aircraft points to the geographic North Pole
a. True b. False Indicate whether the statement is true or false