The highest recorded waterfall in the world is found at Angel Falls in Venezuela
ID: 1502950 • Letter: T
Question
The highest recorded waterfall in the world is found at Angel Falls in Venezuela. Its longest single waterfall has a height of 807 m. If water at the top of the falls is at 15.0 degreeeC. what is the maximum temperature of the water at the bottom of the falls? Assume all the kinetic energy of the water as it reaches the bottom goes into raising the water's temperature. 11. An aluminum rod is 20.0 cm long at 20degreeeC and has a mass of 350 g. If 10,000 J of energy is added to the rod by heat, what is the change in length of the rod? 12. What mass of water at 25.0degreeeC must be allowed to come to thermal equilibrium with a 1.85-kg cube of aluminum initially at 150degreeeC to lower the temperature of the aluminum to 65.0degreeeC? Assume any water turned to steam subsequently recondenses. 13. How much energy is required to change a 40-g ice cube from ice at -10degreeeC to steam at 110degreeeC? 14. A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.0 m x 2.0 m. On a certain day. the indoor temperature is 25degreeeC and the outdoor temperature is 0degreeeC. (a) What is the rate at which energy is transferred by heat through the glass? (b) How much energy is lost through the window in one day. assuming the temperatures inside and outside remain constant? 15An iron plate is held against an iron wheel so that a sliding frictional force of 50 N acts between the two pieces of metal. The relative speed at which the two surfaces slide over each other is 40 m/s. (a) Calculate the rate at which mechanical energy is converted to internal energy, (b) The plate and the wheel have masses of 5.0 kg each, and each receives 50% of the internal energy. If the system is run as described for 10 s and each object is then allowed to reach a uniform internal temperature, what is the resultant temperature increase?Explanation / Answer
friction, F = 50 N
V rel = 40 m/s
a) Rate = Fv = 50*40 = 2000 W
b) E recieved = 50 pc = 1000 W*t = 10000 W = mcdT = 5*450*dt
dt = 4.444 s
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