During radioactive decay, the daughter element is always
A. less massive than the parent.
B. the same mass as the parent.
C. more massive than the parent.
D. None of these choices are correct
Answer: A
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Power: If we double the resistance in a circuit but keep the current in it constant, the power dissipated by that circuit will
A. be four times as great. B. be two times as great. C. be one-half as great. D. be one-fourth as great.
A simple beam AB with an overhang BC is loaded as shown in the figure. The bending moment at the midspan of AB is approximately:
(A) 8 kN?m
(B) 12 kN?m
(C) 17 kN?m
(D) 21 kN?m
A slab of material 1 rests on the surface of a slab of material 2 . A light ray in material 1 has an angle of incidence of 30° on the interface between the materials, while the ray in material 2 has an angle of refraction of 45°. What is the critical angle of incidence for total internal reflection for a ray of light going from material 2 to material 1?
a. 30° b. 45° c. In this case there is no critical angle. d. At least one of the indices of refraction or its equivalent is needed to solve this problem.
When hydrogen reacts with ethene, what is the product?
a. Cycloethene b. Ethane c. Propene d. Ethyne e. Methane