A theory in the field of science is
A) an educated guess.
B) less than a fact.
C) a synthesis of a large body of well-tested knowledge.
D) unchangeable.
Answer: C
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Two objects, a ring and a disk, both with equal mass and radii. Each is rotating about an axis through its center, as shown. Which has the greatest rotational inertia, I, a uniform disk or a ring?
A. They have the same I, since they both have the same mass and radius
B. The disk
C. The ring
A pair of parallel plates, forming a capacitor, are connected to a battery. While the capacitor is still connected to the battery maintaining a constant voltage, the plates are pulled apart to triple their original distance. What is the ratio of the final energy stored to the original energy stored?
a. 3 b. 1 c. 1/3 d. 1/9 e. 9
Why does Earth have an ultraviolet-absorbing stratosphere, while Venus and Mars do not?
What will be an ideal response?
A 0.600-kg piece of metal X is heated to 100°C and placed in an aluminum can of mass 0.200-kg which contains 0.500 kg of water initially at 17.3°C
The final equilibrium temperature of the mixture is 20.2°C, what is the specific heat of metal X? The specific heats of water and aluminum are 4186 J/kg ? K (water) and 910 J/kg ? K (aluminum). A) 140 J/kg ? K B) 270 J/kg ? K C) 450 J/kg ? K D) 900 J/kg ? K