A motor drives a shaft at f 5 10 Hz and delivers P 5 35 kW of power. The allowable shear stress in the shaft is 45 MPa. The minimum diameter of the shaft is approximately:
(A) 35 mm
(B) 40 mm
(C) 47 mm
(D) 61 mm
(B) 40 mm
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An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his moment of inertia about the axis of rotation?
A) It does not change. B) It decreases. C) It increases. D) It changes, but it is impossible to tell which way.
How many values of the magnetic quantum number, m?, correspond to a value of 4 for the orbital quantum number, ??
A) 3 B) 5 C) 8 D) 9 E) 7
The center of gravity is a useful point at which to balance an object. For instance, a ruler can be balanced by placing its center on your finger. Is it possible for the center of gravity of an object to be located at a point where no material exists to balance the object?
1.no, never 2.only for very unsymmetrical objects 3.It is possible in theory, but no objects have been found for which this occurs. 4.Yes, it is possible.
The short lifetime of muons created in the upper atmosphere of the Earth would not allow them to reach the surface of the Earth unless their lifetime increased by time dilation. From the reference system of the muons, the muons can reach the surface of the Earth because:
a. time dilation increases their energy. b. time dilation increases their velocity. c. the relativistic speed of the Earth toward them is added to their velocity. d. length contraction decreases the distance to the Earth.