A sample of ore weighs 37.50 N in air. When the sample is suspended by a light c

Question

A sample of ore weighs 37.50 N in air. When the sample is suspended by a light cord and totallyt immersed in water, the tension in the cord is 28.30 N. What is (a) the total volume, and (b) the density of the sample? A glass flask which has a volume of 950 cm^3 at 0 0 degree C is completely filled with When flask and mercury are heated to 100.0 degree C, 15.2 cm^3 of mercury overflow. If the coefficient of volume expansion of mercury is 18.0 times 10^5 per Celsius degree, compute the coefficient of volume expansion of the glass. A boiler with a steel bottom 2.50 cm thick rests on a hot stove. The area of the bottom is 1875 cm^2. The water inside the boiler is at 100.0 degree C and 753 grams are min. 5.35 min. How much heat per second flows into the water? What is the temperature of the lower surface of the boiler? One hundred grams o lead shot at 100 degree C is dropped into 55.0 g 20.0 degree C which is confined in a copper can of mass 75.0 g. Find the final temperature. Four and one-half moles of an ideal diatomic gas is taken through the reversible cycle shown below. At point A, the pressure, volume and temperature are p_0, V_0 and T_0, respectively. If T_0 is 285K, find: the total heat entering the system per cycle, the total heat leaving the system per cycle, the net work done by the gas per cycle, the efficiency of an engine operating in this cycle. [eff = W_net/Q_in]

Explanation / Answer

1] upthrust = weight of water displaced = 37.5-28.3 = 9.2 N

V = 9.2/[9.8*1000] = 0.000939 m^3

density = m/V = [37.5/9.8]/0.000939 = 4075 kg/m^3

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