The tapered shape of the wheel rims that ride on railroad tracks allows opposite wheels to
A) in effect, vary their diameters.
B) travel at different linear speeds for the same rotational speed.
C) both of these
D) none of these
Answer: C
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a. 2.7 N s, up. b. 2.7 N s, down. c. 7.3 N s, up. d. 7.3 N s, down. e. 9.6 N s, up.
Starting from rest, a proton falls through a potential difference of 1.2 kV. What speed does it acquire?
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A 50.0-N box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. You observe that at one instant the box is sliding to the right at 1.75 m/s and that it stops in 2.25 s with uniform acceleration
What magnitude force does friction exert on this box? A) 3.97 N B) 8.93 N C) 38.9 N D) 50.0 N E) 490 N
A straight wire 20 cm long, carrying a current of 4 A, is in a uniform magnetic field of 0.6 T. What is the force on the wire when it is at an angle of 30° with respect to the field?
A) 0.2 N B) 0.3 N C) 0.4 N D) 0.5 N E) 0.6 N