What length of a certain metal wire of diameter 0.15 mm is needed for the wire to have a resistance of 15 ?? The resistivity of this metal is 1.68 × 10-8 ? ? m
A) 16 mm
B) 16 cm
C) 1.6 m
D) 16 m
E) 160 m
D
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In terms of transferring heat, red-hot wooden coals
A) conduct quite well. B) conduct poorly. C) radiate poorly. D) convect poorly.
The horizontal surface on which the objects slide is frictionless. If M = 2.0 kg, the tension in string 1 is 12 N. Determine F.
A. 25 N B. 20 N C. 30 N D. 35 N E. 40 N
The two masses in the figure are released from rest. After the 3.0-kg mass has fallen 1.5 m, it is moving with a speed of 3.8 m/s. What is the change in mechanical energy done on the system during this time interval by the frictional force on the 2.0 kg mass?
A. ?12 J B. ?17 J C. ?20 J D. ?8.0 J E. ?28 J
A person who normally weighs 700 N is riding in a rather swift elevator that is moving at a constant speed of 9.8 m/s. If this person is standing on a bathroom scale inside the elevator, what would the scale read?
A) more than 700 N B) less than 700 N C) 700 N D) It could be more or less than 700 N, depending on whether the elevator is going up or down.