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Wally Whacko claims to have invented a heat engine that will revolutionize industry. It runs between a hot source at 300^\circ {\rm C} and a cold sink at 25^\circ {\rm C}. He claims that his engine is 92\% efficient. What error did he make in his choice of temperature scales? What is the actual maximum efficiency of his engine?
A 150 kg rock (density is 2500 kg/m 3 ) is dropped to a lake. Determine how much force the man needs to life the rock from the bottom of the lake
In the Cavendish balance apparatus, suppose that m1=1.00 kg, m2= 20.0 kg, and the rod connecting each of the pairs of masses is 28.0cm long. find the magnitude of the net force on one of the small masses
Three moles of a monatomic ideal gas are heated at a constantvolume of 1.5 m3. The amount of heat added is 5.24 x103 J. What is the change in the termperature of the gas
A planet orbits a star once every 2.99 107 s in a nearly circular orbit of radius 1.42 1011 m. With respect to the star, determine the angular speed of the planet
Estimate the pressure exerted on a floor by the following one pointed chair leg (56 kg on all four legs) of area = 0.06 cm2 N/m2
charges 4q and -q are located at the points -2a00 and -a00 respectively. write down the potential ?xy for points in the
A Li-6 nucleus has a mass of 6.015121 u The mass of a single proton is 1.007276 u, What is the binding energy of lithium
an electron moves in the positive x-direction a distance of 2.43 m in 2.99middot10-8 s bounces off a moving proton and
A sled with a mass of 8.00 kg moves in a straight line on a frictionless horizontal surface. find the force acting on the sled
a ladder of length l = 2.2 m and mass m = 14.0 kg rests on a floor with coefficient of static friction ?s = 0.53. what is the normal force the floor exerts on the ladder
An electron microscope uses electrons that are accelerated tospeeds of 30000m/s.The electrone than sent perpendicularly throughanother electric field produced between two plastec 1.00cm apartwith potential difference of 12,000volts
a jeweler needs to electroplate gold atomic mass 196.97 u onto a bracelet. he knows that the charge carriers in the
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