The static friction force on an object
A. can never be greater than the kinetic friction force on it under the same circumstances.
B. can never accelerate the object.
C. can never be greater than the normal force on it.
D. can never be greater than the object's weight.
E. None of the choices are correct.
E. None of the choices are correct.
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A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the speed of the 320-g cart just after the collision?
A) 0.68 m/s B) 0.11 m/s C) 0.21 m/s D) 1.4 m/s E) 1.1 m/s
A diatomic molecule has 2.6 × 10-5 eV of rotational energy in the L = 2 quantum state. What is the rotational energy in the L = 1 quantum state?
A) 3.4 × 10-6 eV B) 4.1 × 10-6 eV C) 5.3 × 10-6 eV D) 7.8 × 10-6 eV E) 8.7 × 10-6 eV
The Solar System is an example of which type of object?
What will be an ideal response?
When you jump from an elevated position you usually bend your knees upon reaching the ground, which makes the time of the contact about 10 times that of a stiff-legged landing. In this way the average force your body experiences is
A) less than 1/10 as great. B) more than 1/10 as great. C) about 1/10 as great. D) about 10 times as great.