How much ice is melted
A 2 kg block is taken from a furnace where its temperature was 650 degree C and placed on a large block of ice at 0 degree C. Assuming that all the heat given up by the iron is used to melt the ice, how much ice is melted?
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At t = 0 a particle (m = 0.771 g, q = 4.15 µC is located on the x axis at x = 18.2 cm, moving with a speed of 36.7 m/s in the positive y direction. For what value of Q (in µC) will the moving particle execute circular motion? (Neglect
A car enthusiast hypothesized that the average horsepower of 8 cylinder cars was less than 475. A random sample of 15 models of 2008 cars was selected and the horsepower measured for each car. The average horsepower was 440.6 with a standard devia
The sleeve is attached to each bar by a quarter inch diameter pin that goes through the sleeve and shaft at right angles to the axis of the shaft. If the torque transmitted by the shaft is 300 in-lb, what is the shear stress in the pins?
With what force would two copper coins, placed 0.93 m apart, repel each other? Assume that each coin contains 2.7 x 1022 copper atoms. (Hint: A neutral copper atom contains 29 protons and 29 electrons.)
A multinomial experiment produced the following results: The null hypotheses is H0: p1=0.30, p2=0.20, and p3=0.50. Calculate the value of the test statistic. Assume a 1% significance level.
A block starts at rest and slides down a frictionless track. The acceleration of gravity is 9.81 m/s^2. It leaves the track horizontally, striking the ground 4.9 m from the end of the track. (the track's horizontal bend is 2.4 m high off the groun
Assume the pumps operate at an average efficiency of 65% and compare the amount of energy required to deliver 1 gallon of crude oil from Prudhoe Bay to Valdez to the energy content of the crude oil.
60% of my students are females and 40% males. The average height for females is 5.8 and average for males is 6. Find the average height of the class.
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