How many excess electrons must be present on each sphere
Two small spheres spaced 20.0 centimeters apart have equal charge.
How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57x10^-21 newtons?
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A hospital patient has been given 131I (half-life = 8.04 days) which decays at 6.3 times the acceptable level for exposure to the general public. How long must the patient wait to reach the acceptable level? Assume that the material merely decays
In a contest of 5 min. there are several mixed up Rubik's cubes to be solved. Let K be the number of Rubik's cubes that Annie can solve in 5 minutes. She solves each cube independently of the others. What is the distribution and parameters of K?
A package has mass of 200 kg is on a horizontal floor. Resistance to its motion other than that due to friction is negligible. The first attempt to move the package is by pulling it with a force of 125N. Calculate the acceleration of the package i
Determine the (a) isentropic efficiency of the compressor; (b) the rate of heat supplied to the heated room; and (c) the COP of the heat pump.
Consider a steam power plant that operates on a simple nonideal Rankine cycle and has a net power output of 38 MW. Determine the mass flow rate of steam.
If a free electron is released at rest from the negative plate, find its speed when it reaches the positive plate. Find the time it takes the electron to travel across the 2.2 mm gap.
Suppose you are interested in bidding on a piece of land and you know that one other bidder is interested. The seller has announced that the highest bid in excess of $10,000 will be accepted. The other competitor's bidding price for the land will
After the gas is ejected, the mass of the astronaut (now wearing a partially empty propulsion unit) is 165 kg. What percentage of the gas propellant in the completely filled propulsion unit was depleted?
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