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An engine draws energy from a hot reservoir with a temperature of 1250 K and exhausts energy into a cold reservoir with a temperature of 355 K. Over the course of one hour, the engine absorbs 105 J from the hot reservoir and exhausts 8.7 × 104 J into the cold reservoir.
1) What is the power output of this engine?
2) What is the maximum (Carnot) efficiency of a heat engine running between these two reservoirs?
3) What is the actual efficiency of this engine?
A resting person requires 14.5-L of per hour to maintain metabolic activities. Such a person breathes in 0.510L of air at approximately 32.0 degrees celsius with each breath. The inhaled air is 20.9 percent while the exhaled air is 16.3percent.
Two point charges, Q_1 = -6.1 mu C and Q_2 = 2.0 mu C, are situated between two oppositely charged parallel plates. The two charges are separated by a distance of x = 0.30 m. suppose that the electric field produced by the charged plates is unifor..
The tension in the string when the ball is at the very bottom of the circle is 4.3 N. At the very bottom of the circle, a very sharp knife is suddenly inserted, to cut the string directly below point of support. How far to the right of where the s..
A 2.40 MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as the heart beats.
A gun shoots bullets that leave the muzzle with a speed of 205m/s. If a bullet is to hit a target 151m away at the level of the muzzle, the gun must be aimed at a point above target.
Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber, If a sample of gold with a mass of 2.477g, is pressed into a leaf of 4.116 ?m thickness, what is the area (in m2)..
A 529 kg automobile slides across an icy street at a speed of 66.0 km/h and collides with the parked car which has a mass of 856 kg. The two cars lock up and slide together. What is the velocity of the two cars just after they collide.
A parallel-plate capacitor with air dielectric has a plate area of 75cm^2. if the capacitor is fully charged by a 300-v source and can hold a charge of 7.5x10^-9c, what is the distance between the plates
The total volume of the column of water in the neck is 0.200 m^3. Illustrate what is the magnitude of the force exerted by the water on the bottom of the container?
A sound wave generated by a source of frequency 440 Hz is moving through 25 oC air. What is the wavelength of the sound wave inside the steel
A certain red giant star has a luminosity of 100,000 times that of the Sun and is located 600 light-years from Earth. calculate the rate of interstellar extinction in the direction of the star
What is current in the coil
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