| № |
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free/or 0.5$ |
| 55883 | A 50.0-g sample of copper is at 25.0°C. If 1 200 J of energy is added to it by heat, what is the final temperature of the copper? |
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| 55884 | A 50.0-g copper calorimeter contains 250 g of water at 20.0°C. How much steam must be condensed into the water if the final temperature of the system is to reach 50.0°C? |
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| 55885 | A 5.00-L vessel contains nitrogen gas at 27.0°C and a pressure of 3.00 atm. Find
(a) The total translational kinetic energy of the gas molecules and
(b) The average kinetic energy per molecule. |
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| 55886 | A 5-lb block is given an initial velocity of 10 ft/s up 45o smooth slope. Determine the time it will take to travel up the slope before it stops. |
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| 55887 | A 4.00-L sample of a diatomic ideal gas with specific heat ratio 1.40, confined to a cylinder, is carried through a closed cycle. The gas is initially at 1.00 atm and at 300 K.
First, its pressure is tripled under constant volume.
Then, it expands adiabatically to its original pressure. Finally, the gas is compressed isobarically to its original volume.
(a) Draw a PV diagram of this cycle.
(b) Determine the volume of the gas at the end of the adiabatic expansion.
(c) Find the temperature of the gas at the start of the adiabatic expansion.
(d) Find the temperature at the end of the cycle.
(e) What was the net work done on the gas for this cycle? |
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| 55888 | A 30-tb block is initially moving along a smooth horizontal surface with a speed of v1 = 6 ft/s to the left. If it is acted upon by a force F, which varies in the manner shown, determine the velocity of the block in 15 s. |
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| 55889 | A 3.00-g lead bullet at 30.0°C is fired at a speed of 240 m/s into a large block of ice at 0°C, in which it becomes embedded. What quantity of ice melts? |
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| 55890 | A 20.0%-efficient real engine is used to speed up a train from rest to 5.00 m/s. It is known that an ideal (Carnot) engine using the same cold and hot reservoirs would accelerate the same train from rest to a speed of 6.50 m/s using the same amount of fuel. The engines use air at 300 K as a cold reservoir. Find the temperature of the steam serving as the hot reservoir. |
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| 55891 | A 20-lb block slides down a 300 inclined plane with an initial velocity of 2 ft/s. Determine the velocity of the block in 3 s if the coefficient of kinetic friction between the block and the plane is uk = 0.25 |
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| 55892 | A 2.00-mol sample of oxygen gas is confined to a 5.00-L vessel at a pressure of 8.00 atm. Find the average translational kinetic energy of an oxygen molecule under these conditions. |
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| 55893 | A 2.00-mol sample of helium gas initially at 300 K and 0.400 atm is compressed isothermally to 1.20 atm. noting that the helium behaves as an ideal gas, find
(a) The final volume of the gas,
(b) The work done on the gas, and
(c) The energy transferred by heat. |
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| 55894 | A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L.
(a) What is the final pressure of the gas?
(b) What are the initial and final temperatures?
(c) Find Q, W, and ΔEint |
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| 55895 | A 2.00-L container has a center partition that divides it into two equal parts, as shown in Figure P22.46. The left side contains H2 gas, and the right side contains O2 gas. Both gases are at room temperature and at atmospheric pressure. The partition is removed, and the gases are allowed to mix. What is the entropy increase of the system? |
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| 55896 | A 2-lb ball is thrown in the direction shown with an initial speed VA = 18 ft/s. Determine the time needed for it to reach its highest point B and the speed at which it is traveling at B. Use the principle of impulse and momentum for the solution. |
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| 55897 | A 1.60-L gasoline engine with a compression ratio of 6.20 has a useful power output of 102 hp. assuming the engine operates in an idealized Otto cycle; find the energy taken in and the energy exhausted each second. Assume the fuel–air mixture behaves like an ideal gas with y = 1.40. |
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| 55898 | A 1.50-kg iron horseshoe initially at 600°C is dropped into a bucket containing 20.0 kg of water at 25.0°C. What is the final temperature? (Ignore the heat capacity of the container, and assume that a negligible amount of water boils away. |
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| 55899 | A 1.50-kg iron horseshoe initially at 600°C is dropped into a bucket containing 20.0 kg of water at 25.0°C. What is the final temperature? (Ignore the heat capacity of the container, and assume that a negligible amount of water boils away.) |
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| 55900 | A 1.00-mol sample of a monatomic ideal gas is taken through the cycle shown in Figure P22.65. At point A, the pressure, volume, and temperature are Pi , Vi , and Ti , respectively. In terms of R and Ti , find (a) the total energy entering the system by heat per cycle, (b) the total energy leaving the system by heat per cycle, (c) the efficiency of an engine operating in this cycle, and (d) the efficiency of an engine operating in a Carnot cycle between the same temperature extremes. |
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| 55901 | A 1.00-mol sample of an ideal gas (y = 1.40) is carried through the Carnot cycle described in Figure 22.11. At point A, the pressure is 25.0 atm and the temperature is 600 K. At point C, the pressure is 1.00 atm and the temperature is 400 K. (a) Determine the pressures and volumes at points A, B, C, and D. (b) Calculate the net work done per cycle. (c) Determine the efficiency of an engine operating in this cycle. |
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| 55902 | A 1.00-mol sample of an ideal gas expands isothermally, doubling in volume. (a) Show that the work it does in ex- panding is W = RT ln 2. (b) Because the internal energy Eint of an ideal gas depends solely on its temperature, the change in internal energy is zero during the expansion. It follows from the first law that the energy input to the gas by heat during the expansion is equal to the energy output by work. Why does this conversion not violate the second law? |
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