It is possible using the analogies between linear motion and rotational motion to write an expression for rotational kinetic energy. The formula for rotational kinetic energy (assuming ? is torque, ? is angular acceleration, I is rotational inertia, and ? is angular velocity) is
A. ½ I ?2.
B. ½ ? ?2.
C. ½ ? ?2.
D. ½ I ?2.
Answer: D
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A velocity selector for ions uses perpendicular electric and magnetic fields. If the electric field used were 800 V/m, what magnetic field would allow the selection of a velocity of 4000 m/s?
A. 0.0400 T B. 0.0800 T C. 0.160 T D. 0.200 T E. 0.500 T
General Questions: An object of weight W is in freefall close to the surface of Earth. The magnitude of the force that the object exerts on Earth is
A. greater than W. B. less than W. C. equal to W. D. zero. E. cannot be determined without knowing the relative masses of the object and the earth.
At 96°F the saturation density of air is 0.04 kg/m3 . If the weather report says the relative humidity is 90% when the temperature is 96°F, the humidity is 0.036 kg/m3
a. True b. False Indicate whether the statement is true or false
A slab of plastic rests on a slab of glass. A ray of light in the plastic crosses the interface between the plastic and the glass with the result that the ray bends toward the normal. What must be true about the indices of refraction in these materials?
a. nplastic > nglass b. nplastic < nglass c. nplastic = nglass d. More information is needed to decide the answer.