A proton moving with a speed of 6.0 × 10^5 m/s perpendicular to a uniform magnetic field of 0.20 T will follow which of the paths described below? (qp = 1.6 × 10^-19 C and mp = 1.67 × 10^-27 kg)
a. a circular path of 1.6-cm radius
c. a circular path of 6.3-cm radius
b. a circular path of 3.1-cm radius
d. a straight line path
B
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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
What is the limiting angle of resolution for the eye if the pupil diameter of the eye is 4.0 mm, the wavelength of the light is 600 nm, and index of refraction of the liquid in the eye is 1.34?
A) 0.42 mrad B) 0.21 mrad C) 0.14 mrad D) 0.11 mrad E) 0.26 mrad
If a spinning star suddenly gets bigger in diameter, what happens to its rotation rate?
a) It is unaffected. b) It decreases. c) It increases.
In an isochoric process, the internal energy of a system decreases by 50 J. What is the work done?
A) zero B) 25 J C) 50 J D) -50 J E) none of the above