Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the longer sides and is parallel to the shorter sides?
a. 2.7 kg/m2
b. 3.6 kg/m2
c. 3.1 kg/m2
d. 4.1 kg/m2
e. 1.6 kg/m2
b
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What is the most important reason why an icy moon is more likely to be geologically active than a rocky moon of the same size?
A) Ice has a lower melting point than rock. B) Ice is less rigid than rock. C) Ice contains more radioactive elements than rock. D) Ice is affected by tidal forces to a greater extent than rock. E) Ice is less dense than rock.
The basic physical principal principle that explains the operation of rocket engines is
A) the atomic hypothesis. B) the law of force pairs. C) Galileo's principle of falling. D) the law of inertia. E) Actually, rockets are unexplainable.
A circular loop of wire lies in the plane of the paper. An increasing magnetic field points out of the paper. What is the direction of the induced current in the loop?
A) counter-clockwise then clockwise B) clockwise then counter-clockwise C) clockwise D) counter-clockwise E) There is no current induced in the loop.
How do we know that different colors of light have different speeds in a material?
a. Because of measurements by Galileo of the speed of different colors of light. b. Because different colors reflect at different angles. c. Because the index of refraction depends on the speed of light in a material, and that index is different for different colors. d. Because Fizeau's measurements measured different colors of light to have different speeds. e. Because the colors combine to form white light.