The percentage by mass of carbon in diamond is about
a. 25%.
b. 75%.
c. 100%.
d. 20%.
c
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Vision Problems: Farsightedness can usually be corrected with
A. converging lenses. B. diverging lenses. C. convex mirrors. D. cylindrical lenses. E. concave mirrors.
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.
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
The stress that occurs when material is pulled apart is called
A) compressional stress. B) tensional stress. C) shear stress. D) simple stress.