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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 32 °C and room temperature is 23?
You are looking down at the earth from inside a jetliner flying at an altitude of 9440 m. The pupil of your eye has a diameter of 1.96 mm. Decide how far apart two cars must be on the ground if you are to have any hope of distinguishing among them in..
a jet flying at 110 ms banks to make a horizontal circular turn. the radius of the turn is 3810 m and the mass of the
A novice skier, starting from rest, slides down a frictionless 35.0 Degrees incline whose vertical height is 185 m. How fast is she going when she reaches the bottom
the electric field caused by a certain point charge has a magnitude of 6500rm nc at a distance of 0.180rm m from the
How come in free fall you feel weightless even though gravity is pulling down on you?
a building is being knocked down with a wrecking ball which is a big metal sphere that swings on a 13-m-long cable. you
in a sodium chloride molecule the equilibrium separation of the na and the cl- ions is 0.24 nm. assuming that the ions
The magnetic field perpendicular to a circular wire loop 14.4 cm in diameter is changed from +0.35 T to -0.64 Tin 300 ins , where + means the field points away from an observer and - toward the observer. Calculate the induced emf. Express your answ..
If the charge is 23 mu/C, the velocity is 1500 m/s, find the force (magnitude and direction) on the charge.
A bullet is fired from the ground at an angle of 45o, Find what initial speed must the bullet have in order to hit the top of a 400 feet tower placed 600 feet away
The secondary coil of a step-up transformer provides the voltage that operates an electrostatic air filter. The turns ratio of the transformer is 45:1. Find the power consumed by the air filter
A machine lifts a mass of 3 kg a distance of 8 meters in 6 seconds. Find the force of gravity on the mass, the energy needed to lift the mass and The power delivered.
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