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200 J enters a Carnot engine from the hot reservoir, held at400 K. During the entire cycle, 50 J of useful work isperformed by the engine. What is the temperature of the coldreservoir?
when an object is placed 67.0 cm from a certain converging lens it forms a real image. when the object is moved to
A golf ball of mass 0.045 kg is hit off the tee at a speed of45 m/s. estimate the impulse imparted to the golf ball
A juggler throws a ball straight up with some initial velocity. Half a second later, the juggler throws another ball straight up from the same height, then what is the initial velocity of each ball
A 0.24-kg ball on a stick is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, Find the tension in the stick
At rest, a car's horn sounds the note A (440 Hz). The horn is sounded while the car is moving down the street. find Is the cyclist ahead of or behind the car
A positive charge ball hangs, attached to a thread of negligiblemass. Similarly a negative charged ball hangs attached to athread of negligible mass. Each ball has mass of 0.14g and amagnitude charge of q. Attracted to each other, each of theirthr..
The wingspan of a 747 jetliner is 60 m. If the plane is flying(horizontally) at 900 km/h in aregion where the vertical component of Earth's magnetic fieldis 0.16 G, what emf develops between the plane's wingtips?
The immediate cause of many deaths is ventricular fibrillation, uncoordinated quivering of the heart as opposed toproper beating. An electric shock to the chest can cause momentaryparalysis of the heart muscle, after which the heart will sometimes..
q1. on a workday the average decibel level of the busy street is 82 db with 100 cars passing a given point every
A 8.50cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.690T pointing up. During the course of 0.180s, the field is changed to one of 0.350T pointing down. What is the average induced emf in the c..
A spring, with a force constant 5.00x10^2 n/m, is horizontal with one end fixed to a wall and the other end free. How far will the block travel once the spring is released
my kids came up with a form of tether ball where they attached a ball to a string and let it swing around the role.
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