As a projectile moves along its parabolic trajectory, which of the following remain constant (ignoring air resistance, and defining the z axis as pointing upward)?

A. Its speed
B. Its velocity
C. Its x-velocity and y-velocity
D. Its z-velocity
E. Its acceleration
F. Its x-velocity, y-velocity, and acceleration
T. Some other combination of the given quantities


F. Its x-velocity, y-velocity, and acceleration

Physics & Space Science

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Weight and g: A spherically symmetric planet has four times the earth's mass and twice its radius. If a jar of peanut butter weighs 12 N on the surface of the Earth, how much would it weigh on the surface of this planet?

A. 3.0 N B. 6.0 N C. 12 N D. 24 N E. 36 N

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An aluminum foil 0.10 mm thick has how many aluminum atoms per square cm? (The density of aluminum is 2.7 × 103 kg/m3 and the atomic mass of aluminum is 27.)

A) 6 × 1017 B) 6 × 1020 C) 6 × 1024 D) 6 × 109 E) 6 × 1030

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The fundamental concept of geology that was developed by James Hutton is

a. radiometric dating. b. the principle of superposition. c. the principle of cross-cutting relationships. d. uniformitarianism.

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A meter stick with a mass of 89.5 g is being supported at the 50.0 cm mark by a pivot that is 1.00 cm above the center of mass of the meter stick. The moment of inertia of the stick about that point is 0.00746 kg? m2

What is the period of oscillation of this system? A) 2.01 s B) 2.41 s C) 5.79 s D) 2.89 s E) 4.02 s

Physics & Space Science