The operation of an electric motor depends on which of the following effects?
a. the Doppler effect
b. the photoelectric effect
c. the force acting on a current-carrying wire in a magnetic field
d. current from the motion of a wire in a magnetic field
c
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A Plexiglas wall has reflectivity of 0.1. Estimate the transmissivity if its emissivity is 0.3.
What will be an ideal response?
A 6.00-kg block is placed on a 30.0° incline and connected to another block on a 36.87° incline. Although the surfaces are frictionless the blocks do not move. What is the mass in kilograms of the block on the 36.87° incline?
?
?
a.
1.80
b.
3.00
c.
4.00
d.
5.00
e.
6.00
Why is the sky blue?
For a Trombé wall fitted to a twenty story building, the Grashof number is for air flowing through the wall was found to be 25 x 10^12. What is the equivalent Reynolds number for the flow?
What will be an ideal response?