When the temperature of the air in a balloon is raised, the volume of the balloon
A. increases.
B. decreases.
C. stays the same.
Answer: A
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What is the effect of the expansion of the universe?
a. The distant galaxies are getting farther apart from each other. b. Each galaxy is getting larger. c. The solar system is getting larger. d. All of the above.
A cylindrical tank is assembled by welding steel sections circumfer-entially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pressure is 2.0 MPa. The maximum stress in the heads of the tank is approximately:
(A) 38 MPa
(B) 45 MPa
(C) 50 MPa
(D) 59 MPa
A metal sphere of radius 2.0 cm carries a charge of 3.0 ?C. What is the electric field 6.0 cm from the center of the sphere?
A) 4.2 × 106 N/C B) 5.7 × 106 N/C C) 6.4 × 106 N/C D) 7.5 × 106 N/C E) 9.3 × 106 N/C
Pressure in a Liquid: The Aswan High Dam on the Nile River in Egypt is 111 m high. What is the gauge pressure in the water at the foot of the dam? The density of water is 1000 kg/m3.
A. 1.09 × 106 Pa B. 1.16 × 106 Pa C. 1.09 × 103 Pa D. 1.11 × 105 Pa E. 1.11 × 102 Pa