Computing the surface charge density on the belt
A charged belt, 35 cm wide, travels at 40 m/s between a source of charge and a sphere. The belt carries charge into the sphere at a rate corresponding to 100 µA. Compute the surface charge density on the belt.
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If the mass center of the body is displaced 3 cm to the left of its equilibrium position and released from rest, describe the motion as a function of time.
Two oppositely charged parallel plates with an electric field of 80 V/m have potential difference of 40 V. A tiny sphere of mass 50 mg with 2120 excess electrons is placed in the field and sits on the positive plate.
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Determine the thermal efficiency of this cycle. Repeat the problem assuming the isentropic efficiency of the turbine is 87% and the isentropic efficiency of the pump is 85%.
The 4.0 V battery is then disconnected and replaced with a 5.0 V battery, with the positive and negative terminals connected in the same manner as before. How much additional charge flows to the positive plate?
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Suppose you are planning to sample cat owners to determine the average number of cans of cat food they purchase monthly.The following standards have beed set: a confidence level of 99% and an error of less than five units.
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