The main drawback of coal as an energy resource is
A) its contribution to the global warming.
B) its contribution to the ozone problem.
C) limited resources are available.
D) its contribution to acid rain.
E) the economics associated with the coal industry.
A
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A stepped steel shaft with diameters d1 5 56 mm and d2 5 52 mm is twisted by torques T1 5 3.5 kN # m and T2 5 1.5 kN # m acting in opposite directions. The maximum shear stress is approximately:
(A) 54 MPa
(B) 58 MPa
(C) 62 MPa
(D) 79 MPa
When a car, moving at velocity v, collides head on with a light volley ball, initially at rest, the ball bounces off with velocity
A) -v. B) -4v. C) -1.5v. D) -2v. E) -v/2.
If the Andromeda Galaxy collided with the Milky Way, what would most likely happen to Earth?
A) The Sun and all its planets would be crushed by collisions with stars and planets from the Andromeda Galaxy. B) Nothing. C) The Sun would not be disturbed, but the solar system would be ripped apart. D) The Sun will turn into a red giant and explode.
A 4.0 kg mass has a velocity of 12 m/s to the WEST. The 4.0 kg mass undergoes an acceleration of 2.0 
to the WEST for 3.0 sec. What is the velocity of the 4.0 kg mass at the end of the 3.0 sec interval?
A. 18 m/s to the WEST B. 6.0 m/s to the WEST C. 0.0 m/s D. 6.0 m/s to the EAST E. 18 m/s to the EAST