At what height should the second ball be placed
Two ping-pong balls each have a mass of 2.7 g and carry a net charge of 0.430 µC. One ball is held fixed. At what height should the second ball be placed directly above the fixed ball if it is to remain at rest there?
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An argon ion laser puts out 5.0 W of continuous power at a wavelength of 532 nm. The diameter of the laser beam is 5.5 mm. If the laser is pointed toward a pinhole with a diameter of 1.2 mm, how many photons will travel through the pinhole per sec
What are the conclusions of the test if the error level is alpha=0.05? what type of error may have occurred? What are the conclusions of the test if the error level is alpha=0.01? what type of error may have occurred?
How far must the key be depressed for a keystroke to be registered, which happens when the capacitance increases by 3.9 pF?
A particle moves on 3 points situated on a circle. At each step it is equally likely to move one step clockwise or one step counterclockwise
Propane (C3 H8) reacts with oxygen (O2) to produce a carbon dioxide and water. The reaction is exothermic, with ΔH= -2220 kJ/mol. What is the heat of formation of propane?
The atomic mass of Neon is 20.2u, and that of krypton is 83.8u. The temperature of the krypton is 293K. What is the temperature of the neon?
Patrick took his sample and his average was 22.57. Now what is the probability that his sample average is more than 20? What is the probability that the true average turnaround time is greater than 20?
One mole of S2 gas is held at a pressure of 0.20 atm and a temperature of 800k. two moles of oxygen gas are held at a pressure of 0.40atm and a temperature of 400k. What is the difference in volume between the two gases?
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