In an experiment, a student brings up the rotational speed of a piece of laboratory apparatus to 30.0 rpm
She then allows the apparatus to slow down uniformly on its own, and counts 240 revolutions before the apparatus comes to a stop. The moment of inertia of the apparatus is known to be 0.0850 kg?m2. What is the magnitude of the retarding torque on the apparatus?
A) 0.0425 N ? m
B) 0.159 N ? m
C) 0.0787 N ? m
D) 0.000278 N ? m
E) 0.0000136 N ? m
Answer: D
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a. 0.29 Hz c. 0.25 Hz b. 0.48 Hz d. 0.38 Hz
A uniform rod of length L and weight W is placed on a fulcrum a distance of 0.4L from the left end. On the left end is placed a mass of weight 2W and on the right end a vertical force F is applied to keep the system in balance. What are the magnitude and direction of the force F?
a. 7/6 W up b. 4/3 W down c. 7/6 W down d. 4/3 W Up
A reaction will occur when a piece of Mg is placed in aqueous Zn(NO3)2 if Mg is ______________ Zn in the activity series
Fill in the blank(s) with correct word
The work done by the gas is zero during an
A) isothermal expansion. B) isobaric expansion. C) adiabatic expansion. D) isometric process.