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
Answer: B
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An alpha particle is moving at a speed of 5.0 × 105 m/s in a direction perpendicular to a uniform magnetic field of strength 0.040 T. The charge on an alpha particle is 3.2 × 10-19 C and its mass is 6.6 × 10-27 kg
(a) What is the radius of the path of the alpha particle? (b) How long does it take the alpha particle to make one complete revolution around its path?
LMC X-3 is a binary system that is believed to contain a black hole
a. True b. False Indicate whether the statement is true or false
Evaporation is a cooling process and condensation is
A) a warming process. B) a cooling process also. C) neither of these
In a nova, there is a white dwarf, an evolving companion star, and a(n) ________ surrounding the white dwarf's equator
Fill in the blank(s) with correct word