Which gases are added to Earth's atmosphere by volcanic eruptions?
A. carbon dioxide, ozone, and methane
B. carbon dioxide, water vapor, and nitrogen
C. nitrogen, oxygen, and ammonia
D. ammonia, methane, and oxygen
Answer: B
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A plutonium nuclear fuel rod shown in Figure 2-71 has energy generation in the amount of 3000 Btu/s?ft^3. For the grid model shown, write the node equations and solve for the temperatures. Assume ? = 10 W/m?K.
Your friend says that the helium used to inflate balloons is a product of radioactive decay. Another friend says no way. With whom do you agree?
A) If helium were a product of radioactive decay, we would all be radioactive. Agree with the friend that says "no way." B) Radioactive decay produces alpha particles, not helium. Agree with the friend that says "no way." C) Your first friend is correct. Radioactive isotopes emit alpha particles which, in turn, capture electrons and become helium atoms. D) Helium is an element of the periodic table, not some product of any reaction. Agree with the friend that says "no way."
A 1.2-kg mass is projected from ground level with a velocity of 30 m/s at some unknown angle above the horizontal. A short time after being projected, the mass barely clears a 16-m tall fence. Disregard air resistance and assume the ground is level. What is the kinetic energy of the mass as it clears the fence?
a. 0.35 kJ b. 0.73 kJ c. 0.40 kJ d. 0.68 kJ e. 0.19 kJ
When we analyze situations that involve the kinetic and potential energies of falling objects, we identify the system as e?
1.only the Earth. 2.only the falling object. 3.both the earth and the falling object. 4.none of these.