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An ideal (Carnot) engine has an efficiency of 43 percent. If it were possible to run it backward as a heat pump. Compute what would be its coefficient of performance?
A closed box has two metal terminals a and b. The inside of the box contains an unknown emf emf in series with a resistance R, Find the emf and R
Crossed magnetic and electric fields are established over a certain region. The magnetic field is .90 T vertically downward. Find what is the electrons speed
In Fig. 29-56, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 16.5 cm. Each wire carries 8.00 A, and the currents are out of the page in wires 1 and 4 and into the page in wires 2 and..
A student is reading a lecture written on a blackboard. Thelenses in her eyes have a refractive power of 62.20 diopters, How far (in meters) is the blackboard from her eyes
A battery of ε = 2.00 V and internal resistanceR = 0.450 Ω is driving a motor. The motor is lifting a 2.0N mass at constant speed v = 0.50 m/s. Assumingno energy losses, find the current i in the circuit. Enter the lower current.
A cannonball sits on top of a 10 meter cliff and is fired at a 10 degree angle with an initial velocity of 50 m/s. How long is the cannonball in the air
question a light stick with two masses attached to it is spinning about its center at 5 revolutions per minute. the
At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. What is the radius of the chamber
A hanging mass and the cylindrical, uniform, frictionless pullery have mass M. What is the acceleration of the hanging mass
Suppose that the specific heat capacity cp Of the body discussed in Section 7.6 of the text is 10 J kg-1 K-1and T1 =200 K. Find the entropy change of the universe in both cases
a 90.0 kg box is pushed by a horizontal force f at constant speed up a frictionless ramp which makes an angle of 38.0
q.1 three point charges two positive and one negative each having a magnitude of 20 uc are placed at the vertices of an
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