An object is placed 15 cm in front of a concave mirror with a focal length of 30 cm. What is the magnification?
a. 1
b. 2
c. 1/2
d. 1/4
e. -2
B
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Radioactivity Basics: A ?- particle is also known as
A. an electron. B. a positron. C. a helium nucleus. D. a high-energy photon.
An unfueled 1000-kg experimental rocket sled at rest on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20 s "burn.". The rocket moves at 160 m/s after the burn. What average force is experienced by the rocket during the burn?
a. 0.80 × 10^4 N c. 0.60 × 10^4 N b. 0.75 × 10^4 N d. 0.35 × 10^4 N
Uranus's moon Miranda is marked by oval patterns of grooves known as _______________
Fill in the blank(s) with correct word
Due to the dust in the interstellar medium, a distant star will appear to an observer on Earth to be
a. brighter and cooler than it really is. b. brighter and hotter than it really is. c. fainter and cooler than it really is. d. fainter and hotter than it really is. e. unchanged in brightness or apparent color.