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You are now operating a Carnot engine at 40% efficiency, which exhausts heat into a heat sink at 298 K. If you want to increase the efficiency of the engine to 65%, to what temperature would you have to raise the heat reservoir?
Three charges, each +6 micro F, are located at the three corners of an equilateral triangle of sides 2 centimeter. Find the electric potential at the center of the triangle
a car is accelerating while its horn is sounding. just after the car passes a stationary person the person hears a
Suppose the peak of a particular star's spectrum occurs at about 6000 Å (Angstrom). (a) Use Wien's law to calculate the star's surface temperature. (b) If this star were a factor of four hotter, at what wavelength would its spectrum peak? In what ..
A concave mirror has a focal length of 43.3 cm. The distance among an object and its image is 75.0 cm. Find (a) the object and (b) the image distance assuming that the object lies beyond the center of curvature.
A particle moves along the x axis. It is initially at the position 0.350 m, moving with velocity 0.070 m/s and acceleration -0.300 m/s2. Find the position of the particle after this time
What average force is needed to stop a 80 kg man running at 4 m/s in a time of .5s? 320N 640N
During the isothermal heat addition process of a Carnot cycle, 900 kJ of heat is added to the working fluid from a source at 400 degrees Celcius
A ball rolls off a platform that is 6.8 meters above the ground. The ball's horizontal velocity as it leaves the platform is 7.4 m/s.How much time does it take for the ball to hit the ground
a weight of 30.0 n is suspended from a spring that has a force constant of 190 nm. the system is undamped and is
If the stagnation pressure rise across the impeller is 45 kPa, determine the loss of available energy across the impeller and the hydraulic efficiency of the pump.
two objects in outer space accelerate toward each other under the influence of their mutual gravitational attraction.
The Leaning tower of Pisa is 55m tall and about 7.0 m indiameter. The top is 4.5m off center. Is the tower in stableequilibrium? If so, How much farther can it lean
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