A fast-moving ball is more easily seen if it is
A) red.
B) orange.
C) yellow-green.
D) green-blue.
E) violet.
Answer: C
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Which of the following is the main reason for the fact that hydroelectric power plants are far more efficient than coal-fired electric power plants?
A) Hydroelectric plants have far fewer moving parts. B) Coal is only partially combustible, due to the presence of large amounts of impurities. C) The law of conservation of energy tells us that heat engines, such as hydroelectric plants, are more efficient than other forms of energy conversion. D) Since the hydroelectric plant is not a heat engine, it is not restricted by the second law of thermodynamics. E) Actually, hydroelectric plants are not significantly more efficient than coal-fired plants.
Shear Modulus: A 25-kg television set rests on four rubber pads that are on the floor, each one having a height of 1.0 cm and a radius of 0.60 cm. A horizontal force is applied to the television set. When the pads are just at the point of sliding over the floor, how far has the television set moved sideways due to the deformation of the pads? The coefficient of static friction between the rubber and the floor is 1.0 and the shear modulus of these rubber pads is 2.6 × 106 Pa.
A. 16 mm B. 8.4 mm C. 4.2 mm D. 2.1 mm E. 1.1 mm