An object is placed 21 cm from a concave lens of focal length 25 cm. What is the magnification?
A)
-0.54
B)
0.54
C)
-0.32
D)
-0.22
E)
0.22
B
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A box is being pulled across a rough floor at a constant speed. What can you say about the work done by friction?
a) friction does no work at all b) friction does negative work c) friction does positive work
A typical supercluster contains no more than about 10,000 stars
Indicate whether the statement is true or false
Which of the following statements about degeneracy pressure is not true?
A) Degeneracy pressure keeps any protostar less than 0.08 solar mass from becoming a true, hydrogen-fusing star. B) Degeneracy pressure can halt gravitational contraction of a star even when no fusion is occurring in the core. C) Degeneracy pressure is a consequence of the laws of quantum mechanics. D) Degeneracy pressure varies with the temperature of the star.
A 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 20° with a speed of 24.5 m/s. What is the minimum coefficient of static friction required for the car not to skid?
A) 0.12 B) 0.24 C) 0.36 D) 0.48 E) 0.60