Liquid crystals have the useful property that
A. they are very strong in one direction but very weak in another.
B. their transparency can be changed by applying an electric field.
C. they can behave like liquid semiconductors and make computers more flexible.
D. they can change from a liquid state to a solid state instantly.
Answer: B
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A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip?
A) 92 km/h B) 90 km/h C) 85 km/h D) 88 km/h
A beam is pin-connected to the tops of two identical pipe columns, each of height h, in a frame. The frame is restrained against sidesway at the top of column 1. Only buckling of columns 1 and 2 in the plane of the frame is of interest here. The ratio (a/L) defining the placement of load Qcr, which causes both columns to buckle simultaneously, is approx-imately:
(A) 0.25
(B) 0.33
(C) 0.67
(D) 0.75
If the velocity of a non-relativistic object is doubled, its energy is quadrupled. This is strictly true only for very low velocities. At what velocity is it the case that a doubling of velocity results in a doubling of energy?
A. 0.45c B. 0.33c C. 0.11c D. 0.20c E. 0.50c
Three masses are located in the x-y plane as follows: a mass of 6 kg is located at (0 m, 0 m), a mass of 4 kg is located at (3 m, 0 m), and a mass of 2 kg is located at (0 m, 3 m). Where is the center of mass of the system?
A) (1 m, 2 m) B) (2 m, 1 m) C) (1 m, 1 m) D) (1 m, 0.5 m) E) (0.5 m, 1 m)