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
b
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A free electron and a free proton are released in identical electric fields. (i) How do the magnitudes of the electric force exerted on the two particles compare?
1.It is millions of times greater for the electron. 2.It is thousands of times greater for the electron. 3.They are equal. 4.It is thousands of times smaller for the electron. 5.It is millions of times smaller for the electron.
The loop is entirely inside the field.
A. forward (in the +x direction). B. backward (in the -x direction). C. zero. D. some other direction (specify).
Compared to the Earth, Mars has experienced wild swings in its axis tilt over relatively short time periods. This is because of its
A) proximity to Jupiter and its lack of a large moon B) greater distance from the Sun C) slower rotation rate D) small size
The escape speed from the moon is what fraction of Earth's escape speed? (Earth/Lunar mass ratio = 81.3; Earth/Lunar radius ratio = 3.67)
A) 0.045 B) 0.17 C) 0.61 D) 0.41 E) 0.21