The percentage by mass of carbon in diamond is about
a. 25%.
b. 75%.
c. 100%.
d. 20%.
c
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A 20.0 N force is applied at an angle of 40.0 degrees above the horizontal to a 4.00 kg box. The box moves a horizontal distance of 4.00 meters. Friction is negligible. The work done by the 20.0 N force is
A. 75.0 J. B. 61.3 J. C. 50.1 J. D. 46.3 J. E. 40.5 J.
The stress that occurs when material is pulled apart is called
A) compressional stress. B) tensional stress. C) shear stress. D) simple stress.
A hollow steel ball of diameter 3.0 m barely floats in water. What is the thickness of the wall of the ball? The density of iron is 7.87 g/cm3 and that of water is 1000 kg/cc
A) 6.6 cm B) 37 cm C) 131 cm D) 79 cm
Vision Problems: Farsightedness can usually be corrected with
A. converging lenses. B. diverging lenses. C. convex mirrors. D. cylindrical lenses. E. concave mirrors.