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

Physics & Space Science

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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

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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

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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.

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A. -100 cm B. -31.3 cm C. 10.2 cm D. 20.8 cm E. 31.3 cm

Physics & Space Science