The drawing below is supposed to be a free-body diagram of a box that sits without slipping on the back of a truck that is moving to the right but is slowing down. Is the diagram correct?
A. Yes.
B. No, 
should point leftward.
C. No, the label should be .
D. No, there should be a leftward drag force.
E. No, 
should not be equal to 
.
F. No, there is some other problem (specify).
B. No, should point leftward.
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A dc motor is connected to a emf of 12.0 V. The resistance of its windings is 2.0 
At normal operating speed, the motor delivers 6.0 W of mechanical power. What current does it draw at normal operating speed?
A. 6.0 A B. 0.50 A C. 1.0 A D. 3.0 A
In order to trap the starship Enterprise, the Klingons build a huge solenoid 10. light years long with a diameter of 2. million kilometers. Every kilometer length of the solenoid contains 100. turns of wire
(a) What magnetic field is produced in the center of the solenoid with a current of 2000. Amperes? (Give your answer in MKS units.) (b) This is how many Gauss?
RMS and Peak Quantities: The potential applied to a 20-? resistor is v = (60 V) cos(33t). What is the rms current through this resistor?
Fill in the blank(s) with the appropriate word(s).
Which of the following particles is considered not elementary?
A. the electron B. the electron antineutrino C. the neutron D. the muon E. the tau