Projectile Motion: A ball rolls over the edge of a platform with a horizontal velocity of magnitude v. The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20 m. What is the magnitude of v if air resistance is negligibly small?
Fill in the blank(s) with the appropriate word(s).
35 m/s
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In this figure, 10 calories of heat are added to each of the two samples of the same gas. Why is T1 greater than T2?
a. There are fewer atoms or molecules in the smaller object, so each atom (molecule) must move more vigorously for a given amount of heat (energy) transferred to the material. b. The thermometer is able to absorb heat from the smaller object more rapidly. c. This follows from the ideal gas law.
___________is the breakdown of a polymer into simple molecules by bacteria.
Fill in the blank(s) with the appropriate word(s).
Angular Momentum: When is the angular momentum of a system constant?
A. Only when its total kinetic energy is constant. B. Only when no net external force acts on the system. C. Only when the linear momentum and the energy are constant. D. Only when no net external torque acts on the system. E. Only when the moment of inertia is constant.
The weight of air in a bathtub (about 1/3 cubic meter) is about the same as the weight of
A) a pea. B) an egg. C) a small apple. D) a pound of butter. E) a 10-pound sack of potatoes.