When you sit on a chair, the reaction to your weight is
A) zero if in equilibrium.
B) the chair pushing on you.
C) the Earth being pulled up.
D) your push down on the chair.
E) the floor pushing up on the chair.
C
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A 5.0-kg stone is thrown upward at 7.5 m/s at an angle of 51° above the horizontal from the upper edge of a cliff, and it hits the ground 1.5 s later. Neglect air. Find the magnitude of its velocity vector just as it reaches the ground
What will be an ideal response?
An object’s x-position is shown in the boxed graph of the following set of graphs. Which of the other graphs in the set most correctly describes its x-velocity?
A. A
B. B
C. C
D. D
E. E
A ball is thrown straight upward from ground level with a speed of 18 m/s. How much time passes before the ball strikes the ground if we disregard air resistance?
A) 3.7 s B) 1.8 s C) 1.1 s D) 0.6 s
What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is at 60 cm?
A) -60 cm B) +30 cm C) -30 cm D) +60 cm E) +130 cm