An aluminum bar of diameter d 5 52 mm is twisted by torques T1 at the ends. The allowable shear stress is 65 MPa. The maximum permissible torque T1 is approximately:
(A) 1450 N?m
(B) 1675 N?m
(C) 1710 N?m
(D) 1800 N?m
(D) 1800 N?m
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Capacitors in Combination: A 5.0-?F and a 12.0-?F capacitor are connected in series, and the series arrangement is connected in parallel to a 29.0-?F capacitor. How much capacitance would a single capacitor need to replace this combination of three capacitors?
A. 33 ?F B. 13 ?F C. 16 ?F D. 38 ?F
A stick is moving along the x-axis at 90%c. A person riding with the stick sees it inclined at 45.° with respect to the x-axis. Observers in the rest frame see the stick making what angle with respect to the x-axis?
A) 79.° B) 66.° C) 53.° D) 45.° E) 88.°
Energy and Momentum: A firecracker explodes in midair and breaks up into many fragments. Which of the following statements are true regarding conditions immediately before and immediately after the explosion?I. The total momentum of the fragments is equal to the original momentum of the firecracker.II. The total kinetic energy of the fragments is equal to the original kinetic energy of the firecracker.
A. Statement I only B. Statement II only C. Both Statement I and Statement II D. Neither statement is true.
The pressure of an ideal gas is doubled during a process in which the energy given up as heat by the gas equals the work done on the gas. As a result, the volume is:
A. doubled B. halved C. unchanged D. need more information to answer E. nonsense; the process is impossible