When air drag affects the motion of projectiles, they don't travel

A) as high.
B) as far.
C) both of these
D) neither of these


Answer: C

Physics & Space Science

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Full Moon always occurs

a. on the 15th of ever month. b. when the Moon is at right angles to the direction of the Sun. c. when the Moon is closer to Sun than the Earth is. d. when the Moon is directly opposite the position of the Sun.

Physics & Space Science

A large stone is resting on the bottom of the swimming pool. The normal force of the bottom of the pool on the stone is equal to the:

a. weight of the stone. b. weight of the water displaced. c. sum of the weight of the stone and the weight of the displaced water. d. difference between the weight of the stone and the weight of the displaced water.

Physics & Space Science

Compared to spiral galaxies, elliptical galaxies have.

A.) More gas, redder colors, and less new star formation. B.) Less gas, bluer colors, and more new star formation. C.) More gas, bluer colors, and more new star formation. D.) Less gas, redder colors, and less new star formation. E.) Less gas, bluer colors, and more new star formation.

Physics & Space Science

A constant horizontal pull acts on a sled on a horizontal frictionless ice pond. The sled starts from rest. When the pull acts over a distance x, the sled acquires a speed v and a kinetic energy K. If the same pull instead acts over twice this distance:

A) The sled's speed will be 2v and its kinetic energy will be 2K. B) The sled's speed will be 2v and its kinetic energy will be K . C) The sled's speed will be v and its kinetic energy will be 2K. D) The sled's speed will be v and its kinetic energy will be K . E) The sled's speed will be 4v and its kinetic energy will be 2K.

Physics & Space Science