The radioactivity from your body
A. does not cause cancer because it is natural
B. is responsible for more than half of the cancer in humans
C. does cause cancer, but at a very low rate
D. helps reduce natural cancer, just as radiation therapy does
Answer: C. does cause cancer, but at a very low rate
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Write the governing equation and the necessary boundary conditions for the problem of a heat exchanger tube as shown in Figure 2-54.
Which of the following is a main criterion separating the three models of the Universe?
A) The size of the Universe B) The average density of the Universe C) The speed at which the Universe is expanding D) The age of the Universe
Conduction: A solid concrete wall has dimensions 4.0 m × 2.4 m and is 30 cm thick. The thermal conductivity of the concrete is 1.3 W/m ? K, and it separates a basement from the ground outside. The inner surface of the wall is at 18°C, and the outside surface is at 6°C. How much heat flows through the wall every hour?
A. 1.8 MJ B. 1.8 kJ C. 500 J D. 5.0 MJ E. 5.0 kJ
Vision Problems: What is the focal length of a contact lens that will allow a person with a near point of 125 cm to read a physics book held 25.0 cm from his eyes?
A. -100 cm B. -31.3 cm C. 10.2 cm D. 20.8 cm E. 31.3 cm