Displacement: Which of the following quantities has units of a displacement? (There could be more than one correct choice.)
A. 32 ft/s2 vertically downward
B. 40 km southwest
C. 9.8 m/s2
D. -120 m/s
E. 186,000 mi
Answer:
B. 40 km southwest
E. 186,000 mi
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A rock is suspended from a scale reads 20.0 N. A beaker of water is raised up so the rock is totally submerged in the water. The scale now reads 12.5 N. What is the density of the rock?
A) 1.60 × 103 kg/m3 B) 2.50 × 103 kg/m3 C) 2.33 × 103 kg/m3 D) 3.00 × 103 kg/m3 E) 2.67 × 103 kg/m3
During loading in a stress-strain test of a material, we observe that the plot is not linear and has no discontinuities. We can assume that:
(a) The material is nonlinear elastic. (b) The material is anelastic. (c) There is elastic and plastic strain. (d) None of the above can be assumed.
A car of mass 1000 kg moves with a speed of 50 m/s on a circular track of radius 100 m. What is the magnitude of its angular momentum (in kg/m2/s) relative to the center of the race track?
a. 5.0 × 10^2 b. 5.0 × 10^6 c. 2.5 × 10^4 d. 2.5 × 10^6 e. 5.0 × 10^3
A major factor limiting the use of single crystal gas turbine blades is ______________.
Fill in the blank(s) with the appropriate word(s).