The position of an object is given by x = at3 – bt2 + ct, where a = 4.1 m/s3, b = 2.2 m/s2, c = 1.7 m/s, and x and t are in SI units. What is the instantaneous acceleration of the object when t = 0.7 s?
A) -13 m/s2
B) 2.9 m/s2
C) 4.6 m/s2
D) 13 m/s2
D
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Two identical stones are dropped from rest and feel no air resistance as they fall. Stone A is dropped from height h, and stone B is dropped from height 2h. If stone A takes time t to reach the ground, stone B will take time
A) 4t. B) 2t. C) t . D) t/ . E) t/2.
General Questions: In order to get an object moving, you must push harder on it than it pushes back on you.
A. True B. False
Which of the lettered graphs below might also legitimately describe the potential energy for the same interaction (between the same two particles!) whose potential energy function is shown in the “original” graph in the upper left? In each case, the vertical axis is energy (increasing upward) and that axis crosses the horizontal axis where r = 0.
A 3,000 kg truck experiences a net force of 2,000 N. What is its acceleration?