An object in mechanical equilibrium is an object
A) moving with constant velocity.
B) having no changes in velocity.
C) at rest.
D) all of the above
Answer: D
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A 2 500-kg ore car rolls 55.0 m down a frictionless 10.0° incline. If there is a horizontal spring at the end of the incline, what spring constant is required to stop the ore car in a distance of 2.10 m?
a. 1.1E+5 kN/m b. 4.5E+5 kN/m c. 2.8E+6 kN/m d. 2.4E+5 kN/m e. 2.4E+4 kN/m
The units of 1/4??0 are:
A) N2/C2 B) N?m/C C) N2?m2/C2 D) N?m2/C2 E) m2/C2
Since the mass of an object is the same for all observers, it is a relativistically ____________ quantity
Fill in the blank(s) with correct word
Free Fall: 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