What is "seeing"?
A. the ability of a telescope to show two very close objects separately
B. the capacity of a telescope to gather more light
C. the distortion of an image due to an atmospheric turbulence
D. the ability of a telescope to see in the night
Answer: C
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A refrigerator has a coefficient of performance of 4 . If the refrigerator absorbs 30 cal of heat from the cold reservoir in each cycle, the heat expelled (in cal) into the heat reservoir is
a. 40.5 b. 37.5 c. 36.5 d. 34.5 e. 22.5
An electron has a speed of 0.643c. Through what potential difference would the electron need to be accelerated (starting from rest) in order to reach this speed? (c = 3.00 × 108 m/s, e = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg)
A) 160 kV B) 200 kV C) 130 kV D) 180 kV
How many atoms are there in the width of a human hair?
A. 25 B. 125,000 c. 273,000,000,000 D. 6x10^23
A circular loop of radius 0.10 m is rotating in a uniform external magnetic field of 0.20 T. Find the magnetic flux through the loop due to the external field when the plane of the loop and the magnetic field vector are
(a) parallel. (b) perpendicular. (c) at an angle of 30° with each other. What will be an ideal response?