Equal charges are suspended by identical threads
Suppose that two balls of mass 2.5 x 10^-4 kg each carry equal charges and are suspended by identical threads of length 13 cm anchored 24cm apart. If each thread makes and angle of 20 degrees with the vertical, what is the charge on each ball?
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Magnesium oxide decomposes into magnesium and oxygen. If12.09 g of magnesium oxide decomposes to form7.29 g of magnesium, what mass of oxygen gas is also released in the reaction?
Then use Archimedes' principle to find the density required for the air inside the balloon. Then find the temperature of the air inside the balloon.
A committee of 2 is chosen at random from a population of 4 men and 5 women. What is the probability that the committee will consist of 1 man and 1 woman? (Enter your probability as a fraction.)
If we drop the lead into the water, find the final temperature (degrees C) of the water when the lead and water have come to a common temperature. Neglect any flow of heat to or from the environment. Give the answer to 4 significant figures.
Determine (a) the net power developed in kW (b) the back work ratio, and (c) the thermal efficiency of the cycle . You may assume air to behave like an ideal gas.
Draw the tree for Red Cat's decision problem and determine the optimum decision based on expected values. Include the possibility of launching or not:
Determine (a) the compressor power, in kW, (b) the refrigerating capacity, in tons(1 ton of refrigeration=3.52 kW), and (c) the coefficient of performance. Show the cycle on a T-s diagram.
Test whether the mean time to assemble with the new method is less than that for the old method ((Use t as test statistic)): The old assembly line method for assembling a product had a mean of 50 minutes.
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