Weight and g: An astronaut goes out for a "space-walk" at a distance above the earth equal to the radius of the earth. What is her acceleration due to gravity at that point?
A. zero
B. g
C. g/2
D. g/4
E. g/
Answer: D
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A 60-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall. If the ladder has a mass of 25 kg and it makes an angle of 60° with the ground, find the force of friction of the ground on the foot of the ladder
a. 1.4E+1 N b. 1.6E+2 N c. 2.4E+2 N d. 2.7E+2 N e. 4.2E+3 N
The half-life of a muon is 2.2 ?s. How fast is it moving relative to an observer who says its half-life is 4.4 ?s?
a. 0.87 c b. 0.75 c c. 0.97 c d. 0.72 c e. 0.50 c
Which of the following statements about Hawking radiation is not true, at least according to our current understanding?
A) It was first predicted by Stephen Hawking in the 1970s. B) It causes black holes to slowly shrink in mass. C) It has never yet been observed. D) It represents a strange form of radiation that emerges from within the event horizon of a black hole. E) It occurs when real particles are created from the gravitational potential energy of a black hole.
The hotter an object, the bluer it appears
a. True b. False Indicate whether the statement is true or false