A supercluster is a ________.
A. group of open star clusters
B. cluster of several dozen galaxy clusters
C. group of globular star clusters
D. All of these choices are correct.
Answer: B
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You have a PV diagram for a device going through a cyclic process forming a closed loop on the diagram. How can you tell from the diagram whether the device is acting as a heat engine and not as a refrigerator?
a. The loop is longer than it is high which means it is acting as a refrigerator. b. The loop is higher than it is long which means it is acting as a refrigerator. c. The loop proceeds clockwise which means it is acting as a heat engine. d. The loop proceeds counterclockwise which means it is acting as a heat engine.
A ball is thrown straight up, and reaches the top of its trajectory, the acceleration
a. zero. b. 9.8 m/s2. c. points down. d. points up.
What is the radius of curvature of the path of a 3.0-keV proton in a perpendicular magnetic field of magnitude 0.80 T?
A. 9.9 mm B. 1.1 cm C. 1.3 cm D. 1.4 cm E. 7.6 mm
A steel hanger with solid cross section has horizontal force P 5 5.5 kN applied at free end D. Dimension variable b 5 175 mm and allowable normal stress is 150 MPa. Neglect self-weight of the hanger. The required diameter of the hanger is approximately:
(A) 5 cm
(B) 7 cm
(C) 10 cm
(D) 13 cm