Who envisioned the motion of planets as projectiles obeying the laws of physics?
A) Kepler
B) Newton
C) both of these
D) neither of these
Answer: B
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What happens to the surface temperature and luminosity when gravity first assembles a protostar from a collapsing cloud?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.
A 60-W light bulb connected to a 120-V source draws a current of
A) 0.25 A. B) 0.5 A. C) 2.0 A. D) 4.0 A. E) more than 4 A.
What is the angular magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye (image at the far point) having a near point of 25 cm and a far point at infinity?
A) 2.0 x B) 3.0 x C) 3.6 x D) 4.0 x E) 6.3 x
The current in an electron beam in a cathode-ray tube is measured to be 280 µA. How many electrons hit the screen in 50 s? (e = 1.6 × 10^-19 C)
a. 2.2 × 10^11 electrons c. 8.8 × 10^15 electrons b. 8.8 × 10^16 electrons d. 2.2 × 10^15 electrons