Which of the following is not a unit of energy?
A) Calorie
B) joule
C) calorie
D) kilowatt
E) British thermal unit
D
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A uniform sphere of radius R and mass M rotates freely about a horizontal axis that is tangent to an equatorial plane of the sphere, as shown below. The rotational inertia of the sphere about this axis is
?
?
A.
.B.
.C.
.D.
.E.
.A circular loop of radius 0.10 m is rotating in a uniform external magnetic field of 0.20 T. Find the magnetic flux through the loop due to the external field when the plane of the loop and the magnetic field vector are
(a) parallel. (b) perpendicular. (c) at an angle of 30° with each other.
Five objects of mass m move at velocity 
at a distance r from an axis of rotation perpendicular to the page through point A, as shown below. The one that has zero angular momentum about that axis is
a.
b.
c.
d.
e.
Optical fibers work because of dispersion of light
Indicate whether the statement is true or false