For a blend of long-chain molecules, if the enthalpy of mixing is positive, it is expected that the polymers should mix in the liquid at all temperatures above the melting temperature. _____________
Fill in the blank(s) with the appropriate word(s).
False
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The radius of the Earth is 6,380,000 m at the equator. Give the radius of the earth in scientific notation.
A. 638 × 104 m B. 6380 × 103 m C. 6.38 × 106 m D. 0.638 × 107 m
An object of mass 4.0 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s. Ignore friction and use g = 10 m/s2. How high did the object go?
A) 20 m B) 4.5 m C) 15 m D) 80 m E) None of the other choices is correct.
The half-angle of the conical shock wave produced by a supersonic aircraft is 60°. What is the ratio of the speed of the aircraft to the speed of sound?
A) 2.0 B) 1.7 C) 0.87 D) 1.2
Tensile train is
A) the ratio of the change in length to the original length. B) the stress per unit area. C) the same as force. D) the applied force per cross-sectional area. E) the ratio of stress to elastic modulus.