The concept of molecules:
a. helps model how the law of definite proportions might work.
b. proves the law of definite proportions.
c. is unrelated to the law of definite proportions.
d. violates the law of definite proportions.
e. supports the Aristotelian concept of four basic elements.
a
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A physical pendulum is composed of a disc whose center of gravity is attached to a thin rod. The disc has a moment of inertia of 1?2 MR2. The mass of the disc is 1.00 kg and has a radius of 40 cm. The length of the rod is 50.0 cm. The period of the physical pendulum is
A. 2.22 sec. B. 2.03 sec. C. 1.89 sec. D. 1.63 sec. E. 1.32 sec.
In an isochoric process where the pressure increases from to , does the internal energy of the system increase or decrease and does the temperature increase or decrease?
a. The internal energy increases and the temperature decreases. b. The internal energy increases and the temperature increases. c. The internal energy decreases and the temperature decreases. d. The internal energy decreases and the temperature increases.
The second law of thermodynamics states that
A) energy cannot be created or destroyed B) matter cannot be crated or destroyed C) the energy in a system undergoes changes that lead to increasing disorder D) the energy in a system undergoes changes that lead to increasing complexity
The Sun is gradually increasing in brightness as it ages. Why isn't this considered to be an explanation for global warming?
A) A change in the Sun's brightness would not be expected to have any effect on Earth's average temperature. B) The scientists are covering up this potentially valid explanation. C) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does. D) The Sun is increasing in brightness much too slowly to be causing the current warming.