The isotope 64Zn has a nuclear radius of 4.8 × 10^?15 m. Approximately what is the nuclear radius of the isotope 27Al?
a. 2.0 × 10^?15 m
b. 2.7 × 10^?15 m
c. 3.6 × 10^?15 m
d. 4.0 × 10^?15 m
c
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Vision Problems: The near point of a farsighted person is 65 cm. What power contact lens must he use to correct this problem and be able to read a book at a normal near point of 25 cm?
A. -4.2 diopters B. -2.5 diopters C. -2.4 diopters D. +4.2 diopters E. +2.5 diopters
Two blocks are made of the same material, but one has twice the volume of the other block. Which block will have the greater shear modulus?
A) It will be the same for both of them. B) the larger one C) the smaller one
Which of the following statements best describes the quantum property spin?
A) Spin is a measure of the rotation rate of a subatomic particle. B) Spin is a measure of the rate at which a particle orbits another particle. C) Spin is a property that applies only to large objects, like baseballs. D) Spin is not meant to be taken literally, but measures the inherent angular momentum of a subatomic particle. E) Spin is not a fundamental property, but rather something that can change randomly at any time.
A compact heat exchanger uses finned tubes as shown in Figure 9-30, spacing B. Determine the pressure drop and the convective heat transfer coefficient for air passing around the finned tubes at 27ºC, 5 m/s and with viscosity of 0.02 g/m?s. Air leaves the finned tubes at 100ºC. Also, determine the heat exchanger volume per unit surface area of heat exchange.
