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A 20% efficient real engine is used to speed up a train from rest to 5.00 m/s. It is known that an ideal (Carnot) engine using the same cold and hot reservoirs would accelerate the same train from rest to a speed of 6.50 m/s using the same amount of fuel.
The engines use air at 300 K as a cold reservoir. Find the Temperature of the steam serving as the hot reservoir.
I know the efficiency of Carnot engine is 1- (T_c/T_h) and the thermal efficiency of a heat engine is 1- (Q_c/Q_h). I'm not sure how to set this up.
Doing a report about Chernobyl disaster now, and the knowledge and focus on is Physicists use models to explain and reconcile observed energy phenomena;
Light of wavelength 4.80 102 nm illuminates a pair of slits separated by 0.270 mm. find the distance between the first and second dark fringes
The springs of a 1700-kg car compress 4.90mm when its 63.0-kg driver gets into the driver's seat. If the car goes over a bump
A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 81.0 m/s at ground level. The engines then fire.
an alpha particle has a charge of 2.00e. how much work is required to move this particle across a potential difference of 2270 volts?
A war-wolf or trebuchet is a device used during the Middle Ages to throw rocks at castles and now sometimes used to fling large vegetables and pianos as a sport. A simple trebuchet.
a 38 g bullet strikes a 0.65 kg block attached to a fixed horizontal spring whose spring constant is 6.2 x 103 nm and
A plane flies at 1.95 times thespeed of sound. Its sonic boom reaches a man on the ground 1.00 minafter the plane passes directly overhead. What is the altitude of the plane
A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 190 mi/h in 2.00 s. (a) Find the average acceleration of the plane. Your response is within 10% of the correct value. This may be due to round..
In a uniform electric field of magnitude E, the field lines cross through a rectangle of area A at an angle of 77.0° with respect to the plane of the rectangle
Each cable has a length of l = 2.70 -{rm m}. What is the tension T in each of the cables? Use 9.80- {rm m/s}^2 for the magnitude of the acceleration as a result of gravity.
What is the resistance of a lightbulb that uses an average power of 40.0 W when connected to a 60.0-Hz power source having a maximum voltage of 132 V
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