Two students hold a long wire and rotate it
across the earth’s magnetic field so that the wire traces a circular path of
radius 1.2 m. The motional emf produced
in the rope is then measured on a voltmeter. If the angular frequency of
rotation is w = 12 rad.s-1, calculate the maximum possible motional emf in the
wire. (Use B = 0.3 G = 0.3Ã10-4 T for the Earthâs magnetic field.)
16.2
V
1.62
V
1.63
mV
0.163
mV
Heat transfer occurs between two bodies in
thermal contact when they differ in
mass
specific
heat
density
temperature
Which of the following best describes a
substance whose temperature remains constant while at the same time it is
experiencing an inward heat flow?
a
gas under constant volume
a
liquid
a
solid
a
substance undergoing phase change.
What happens to an amount of water when its
temperature is reduced from 8°C to 4°C?
Its
density increses
its
density decreases
its
density remains a constant
it
vaporizes
A ray of light strikes a mirror at an angle
of 53° to the mirrorâs surface. What is the angle of incidence with respect to
the normal drawn to the surface of the mirror?
57o
37o
-53o
23.7o
A ray of light in air strikes a glass
surface at an angle of incidence of 30°. Calculate the angle of refraction.
(Use nair = 1.0 and nglass = 1.5.)
19.3o
75.2o
15.8o
35.3o
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