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Some heat engines can run on very small temperature differences. One manufacturer claims to have a very small heat engine that can run on the temperature difference between your hand and the air in the room.Estimate the theoretical maximum efficiency of this heat engine. Assume hand temerature is 32C and room temperature is 23?
Using the mass-luminosity relationship if a main sequence star has a luminosity of 3000 times the luminosity of the Sun, what is its mass in relation to the Sun?
The resistance of an electric stove element at operating temperature is 11 \Omega. If 220 V are applied across it, what is the current during the stove element? How much energy does the element convert to thermal energy in 30.0 s?
A parallel-plate vacuum capacitor has 9.20 J of energy stored in it. The separation among the plates is 2.90 mm .If the separation is decreased to 1.55 mm. What is the energy now stored if the capacitor was disconnected from the potential source befo..
A small mailbag is released from a helicopter that is descending steadily at 2.13 m/s. How far is it below the helicopter
A 60 kilogram person stands on a scale inside of an elevator. The elevator is accelerating upward at a speed of 2.2 m/s2. Obtain how much does the scale read
consider a youngs two-slit experiment in which the wavelength of light is 35 smaller than the distance between the
a test rocket is launched by accelerating it along a 200.0 m incline at 1.78 ms2 starting from rest at point a. the
an energy bar contains 18g of carbohydrates. if the energy bar was his only fuel how far could a 68kg person walk at
Monochromatic light falls on two very narrow slits 0.044mm apart. Successive fringes on a screen 6.90m away are 8.2cm apart near the center of the pattern. Determine the wavelength of the light
A 130-g baseball, moving along the x-axis with speed 29.0 m/s strikes a fence at a 45 degree angle and rebounds along the y-axis with unchanged speed. Give x and y components of its change in momentum.
A total electric charge of 4.50 nC is distributed uniformly over the surface of a metal sphere with a radius of 22 cm. The potential is zero at a point at infinity. Find the value of the potential at 45 cm from the center of the sphere.
A 0.140-kg baseball is dropped from rest. It has a speed of 1.20 m/s just before it hits the ground. what is the average force exerted by the ground on the ball
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