Rotational Kinetic Energy: A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts down a ramp that makes an angle of 25° below the horizontal. What is the rotational kinetic energy of the hoop after it has rolled 3.0 m down as measured along the surface of the ramp?
A. 34 J
B. 22 J
C. 45 J
D. 62 J
E. This question cannot be answered without knowing the radius of the hoop.
Answer: C
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If no net external force acts on a system, the total momentum of the system is a conserved quantity
Indicate whether the statement is true or false
Apparent weightlessness can be experienced in freely falling elevator
Indicate whether the statement is true or false
1 L of water at 20°C will occupy what volume at 80°C? Water has a volume expansion coefficient of 210 × 10-6/C°
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