Heat and Work - Page 2
Questions
- How many grams of water would require 2,153 joules of heat to raise its temperature from 44 °C to 81 °C? The specific heat of water is 4.184 J/g °C.
- What are some common mistakes students make with heat in thermodynamics?
- A sample of oxygen gas expands in volume from 1.6 L to 5.4 L at constant temperature. What is the work done in joules if the gas expands against a constant pressure of 0.80 atm?
- How does heat affect pressure?
- One #"mol"# of an ideal gas, initially at #"300 K"#, is cooled at constant #"V"# so that #"P"_f# is #1/4 "P"_i#. Then the gas expands at constant #"P"# until it reaches #"T"_i# again. What is the work #w# done on the gas?
- If the burning of the fuel in a potato cannon performs 855 J of work on the potato and produces 1422 J of heat, what is #DeltaE# for the burning of the fuel?
- A gas expands in volume from 35.6 mL to 70.6 mL at constant temperature. What is the work done (in joules) if the gas expands against a constant pressure of 3.2 atm?
- The work done when a 5.0 kg block of ice is moved from 2.5 m/s to a speed of 6.0m/s ?
- A gas is contained in a cylinder with a pressure of 120kPa and is initial volume of 0.66. How much work is done by the gas as it expands at constant pressure to twice its volume, or is compressed to one-third its initial volume?
- Why is Q = ∆U (heat = change in thermal energy)?
- The temperature of a block of iron, which has a specific heat of 450 j/(kg k), increases by 3 k when 2700 j of energy are added to it. what is the mass of this block of iron?
- What is the correct answer to 39th question and why?
- A bicyclist was moving at a rate of 5 m/s, and then sped up to 9 m/s. If the cyclist has a mass of 130 kg, how much work was needed to increase his velocity?
- How does heat energy affect the movement of water molecules?
- Is heat transferred in our atmosphere by conduction?
- For a #"313 g"# sample of helium gas that cools by #41.6^@ "C"# due to being compressed by #"267 L"# at a constant external pressure of #"1 atm"#, if its molar heat capacity is #"20.8 J/mol"^@ "C"#, calculate #DeltaE#, #q#, #w#, and #DeltaH#?
- If a system loses 250 kJ of heat at the same time that it is doing 500 kJ of work on the surroundings, what is the change in the internal energy of the system?
- During an isothermal process, 5.0 J of heat is removed from an ideal gas. What is the work done in the process?
- Light with a frequency of #2.79 * 10^15 Hz# strikes a metal surface and ejects electrons that have a maximum kinetic energy of #6.4 eV#. What is the work function of metal?
- A piece of metal floats on mercury .the coefficient of expansion of metal and mercury are #gamma_1# and #gamma_2# ,respectively .if the temperature of both metal and mercury increased by an amount #Delta T# . See description ?