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A Carnot engine operates with an efficiency of 23.0% when the temperature of its cold reservoir is 274 K. Assuming that the temperature of the hot reservoir remains the same, what must be the temperature of the cold reservoir in order to increase the efficiency to 28.0%?
Unpolarized light passes through two polarized sheets. Theaxis of the first is vertical and that of the second is at16degrees to the vertical. What is the fraction of the initiallight that is tranmitted
A 0.4 guitar string is vibrating in its fundamental frequency. The maximum acceleration of a point at the middle of the string is 8400m/s^2 amd the maximum velocity of that point is 3.80m/s. What is the amplitude of the wave? what is the wave speed..
Three charges (q1 = 7.6 ?C, q2 = -4.7 ?C, and q3 = 1.1?C) are located at the vertices of an equilateral triangle with side d = 6.1 cm. q1 is on the bottom left, q2 is on the bottom right, and q3 is at the top.
A point source of light is 200 cm below the surface of a body of water. Find out the diameter of the circle at the surface through which light emerges from the water.
A 1900kg car experiences a combined force of air resistance andfriction that has the same magnitude whether the car goes up ordown a hill at 27m/s. Going up a hill, the car's engine needs toproduce 47hp more power to sustain the constant velocity ..
Illustrate what is the maximum height of each ball after the elastic collision? What are the coordinates of the CM of the two balls when the lighter ball was pulled up? Consider the heavier ball to be at the origin before the collision.
An airplane propeller is rotating at 1250 rpm It takes 4.27×10^-3 s to turn through 32 degrees. At 201 rpm, what is the period of the propeller in seconds
A woman hangs by her feet from "gravity boots" that support her weight from above. What is the average blood pressure in a major artery in her ankle
A droplet of ink in an industrial ink-jet printer carries a charge of 2e-10 C, Find the strength of the electric field to produce this force
The critical angle of a certain piece of plastic in air is ?c = 37.3º, what is the critical angle if the piece of plastic is immersed in water
Three equal point charges, each with charge 1.10 , are placed at the vertices of an equilateral triangle whose sides are of length 0.200. Calcualte the electric potential energy of the system?
A Federation starship ( 2.20×10^6kg ) uses its tractor beam to pull a shuttlecraft ( 2.20×10^4kg ) aboard from a distance of 12.0km away. The tractor beam exerts a constant force of 4.0×104N on the shuttlecraft. Both spacecraft are initially at..
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