Starting from rest at t = 0, a 5.0-kg block is pulled across a horizontal surface by a constant horizontal force having a magnitude of 12 N. If the coefficient of friction between the block and the surface is 0.20, at what rate is the 12-N force doing work at t = 5.0 s?
a. 0.13 kW
b. 0.14 kW
c. 0.12 kW
d. 26 W
e. 12 W
d
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Bar One has a Young's modulus that is bigger than that of Bar Two. This indicates Bar One:
a. is longer than Bar Two. b. has a greater cross-sectional area than Bar Two. c. has a greater elastic limit than Bar Two. d. is made of material that is different from Bar Two.
The mechanical equivalent of heat was first determined by
A) Lord Kelvin. B) James Joule. C) Stefan and Boltzmann. D) Count Rumford. E) Con Edison.
Exhibit 16-1
A graph of position versus time for an object oscillating at the free end of a horizontal spring is shown below.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 16-1. The point at which the object has zero velocity and negative acceleration is
A. A B. B C. C D. D E. E
An object is made up of three masses connected by massless rods of fixed length
Mass A is located at (30.0 cm, 0 cm) and has a mass of 250 grams, mass B is located at (0 cm, 30.0 cm) and has a mass of 350 grams, mass C is located at (-30.0 cm, 0 cm) and has a mass of 450 grams. What is the moment of inertia of this object about an axis perpendicular to the x-y plane and passing through the origin? A) 0.0945 kg m2 B) 0.315 kg m2 C) 0.185 kg m2 D) 0.0135 kg m2 E) 0.0450 kg m2