Thermal Expansion: The coefficient of linear expansion of copper is 17 × 10-6 K-1. A block of copper 30 cm wide, 45 cm long, and 10 cm thick is heated from 0°C to 100°C What is the change in the volume of the block?
A. 2.3 × 10-5 m3
B. 4.6 × 10-5 m3
C. 5.2 × 10-5 m3
D. 6.9 × 10-5 m3
E. 14 × 10-5 m3
Answer: D
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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 shear force of 400 N is applied to one face of an aluminum cube having sides of 30 cm each. What is the resulting displacement of this face of the cube if the opposite face is held fixed? The shear modulus for aluminum is 2.5 × 1010 N/m2.
A. 1.9 × 10-8 m B. 4.4 × 10-8 m C. 5.3 × 10-8 m D. 8.2 × 10-8 m
Double-Slit Interference: A double-slit interference experiment is performed in the air. Later, the same apparatus is immersed in benzene (which has an index of refraction of 1.50), and the experiment is repeated. When the apparatus is in benzene, you observe that the interference fringes are
A. more closely spaced than when the apparatus is in air. B. equally spaced as when the apparatus is in air. C. more widely spaced than when the apparatus is in air.
A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?
A) 20 cm B) 15 cm C) 7.5 cm D) 5.0 cm