Rotational Kinetic Energy: A solid uniform disk is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts up a ramp that makes an angle of 25° with the horizontal. What is the speed of the disk after it has rolled 3.0 m up as measured along the surface of the ramp?
A. 4.0 m/s
B. 1.9 m/s
C. 2.1 m/s
D. 6.8 m/s
E. 8.0 m/s
Answer: B
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Two objects with different sizes, masses, and temperatures are placed in thermal contact. Choose the best answer. Energy travels
1.from the larger object to the smaller object. 2.from the object with more mass to the one with less mass. 3.from the object at higher temperature to the object at lower temperature.
The solubility parameter of polyethylene is 16.6 (MPa)0.5 and for ethanol it is 26.0 (MPa)0.5. Should ethanol dissolve polyethylene? _____________
Fill in the blank(s) with the appropriate word(s).