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Prove that the efficiency of two Carnot engines operating in tandem, one going from a cold reservoir of temperature Tc to a hot reservoir ofTj, then the second going from a cold reservoir of temperature Tj to a hot reservoir of temperature Thmust be less than that of a single Carnot engine going from Tc to Th.
One of Einstein's postulates says that nothing travels faster than the speed of light in a vacuum, c, what limit does this place on the numerical value for n
Consider a sunspot with measured field strength 1000 Gauss. Assume the ratio of the total brightness of the gas at the center of the sunspot, Determine the temperature of the gas inside and outside the sunspot
Two identical masses are connected to vertical springs each with a force constant k the coordinates x1 and x2 measure the distance of each mass from its equilibrium position write newton's 2nd law for each mass.
A grocery sack can withstand a maximum of 310 N before it rips. Will a bag holding 20.0 kg or groceries that is lifted from the checkout counter at an acceleration of 5.5 hold?
What must the charge (sign and magnitude) of the particle of mass 1.42 g be for it to remain stationary when placed in a downward-directed electric field of magnitude 650 N/C.
A 1.00kg mass is connected to a spring with a spring constant of 4.00 N/m. estimate the maximum velocity of the simple harmonic motion
A 7.5 cm diameter horizontal pipe gradually narrows to 6 cm. When water flows through this pipe at a certain rate, What is the volume rate of flow
Consider a rectangle which is constructed with the long side having a length L and the short side having a length 0. 5L. What is the linear speed of the outer edge when the rectangle is again vertical but now is straight down
Sketch a free-body diagram of the plank. How far can a painter of mass 70.0 kg walk on the overhanging part of the plank before it tips.
What is the PV work that is done ON the system when 20J of PV work is done on the surroundings W(system).
A research group plans to construct an engine that extracts energy from the ocean, using the fact that the water temperature near the surface is greater than the temperature in deep water. what is the maximum efficiency such an engine could have
A yo-yo has a rotational inertia of 977 g•cm2 and a mass of 117 g. How long does the yo-yo take to reach the end of the string
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