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A vessel contains 10-3 m3 of helium gas at 3 K and 103 Pa. Take the zero of internal energy of helium to be at this state.
(a) The temperature is raised at constant volume to 300 K. Assuming helium to behave like an ideal monatomic gas, how much heat is absorbed, and what is the internal energy of the helium? Can this energy be regarded as the result of heating or working?
(b) The helium is now expanded adiabatically to 3 K. How much work is done, and what is the new internal energy? Has heat been converted to work without compensation, thus violating the second law?
(c) The helium is now compressed isothermally to its original volume. What are the quantities of heat and work in this process? What is the thermal efficiency of the cycle? Plot the cycle on a PV diagram.
Electromagnetic wave 1 has a maximum electric field of 55 V/m, and electromagnetic wave 2 has a maximum magnetic field of 1.5 microtesla. Calculate the average intensity of the first wave
Precisely 1.10 after the speeder passes, the policeman steps on the accelerator. If the police car's acceleration is 2.10 m/s2, Explain how much time elapses after the police car is passed until it overtakes the speeder
An 8.68-kg block slides with an initial speed of 1.80 m/s down a ramp inclined at an angle of 26.3° with the horizontal. find the distance the block slides before coming to rest
the magnetic flux through a circuit is reduced from 35 tm2 to 5 tm2 in 0.1s. the current induced in the circuit is 3.6
A 15 kilogram block is accelerated at 1.7 m/s2 up a frictionless plane inclined at 5 degree to the horizontal, with the speed increasing from 10 m/s to 28 m/s. Evaluate the change in the block mechanical energy
a car is traveling on a straight road. the maximum velocity that can be attained by the car is 24 ms. the maximum
A wire has a length of 8.80 10-2 m and is used to make a circular coil of one turn. find the maximum torque that this coil can experience
A 130 horizontal beam is supported at each end. A 310 piano rests a quarter of the way from one end. What is the vertical force on each of the supports
A 735 N man stands in the middle of a frozen pond of radius 5.0 m. He isunable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, hethrows his 1.2 kg physics text book horizontally towar..
the pressure change outside a house is +10.00mmHg. the roofhas two halves, each with the area of 61.045m^2, what is the magnitude and direction of the net force
A 1.51 Volt battery has internal resistance 1.15ohm. The battery powers a light bulb whose filament (when lit) has resistance 9.10 ohm. Estimate the current through the light bulb
find the angle counterclockwise relative to the horizontal.
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