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Heat flows from a reservoir at 373 K to a reservoir at 273 K through a 0.42-m copper [thermal conductivity 390 J/(s·m·C°)] rod with a cross-sectional area of 9.1x10 -4 m 2 (see the drawing). The heat then leaves the 273-K reservoir and enters a Carnot engine, which utilizes part of this heat to do work and rejects the remainder to a third reservoir at 173 K. How much of the heat leaving the 373-K reservoir is rendered unavailable for doing work in a period of 2.2 min?
when you push down on a bicycle pump the pressure on the gas changes from 1.0 atm to 3.0 atm. by what factor does the
two point charges are placed along a horizontal axis with the following values and positions 2 microc at x 0 cm and -
You would like to slow down your aging process by traveling very fast relative to Earth on a spaceship. What is the required speed of the spaceship
If John Glenn weighed 640 N on Earth's surface, a) how much would he have weighed if his Mercury spacecraft had (hypothetically) remained at twice the distance from centre of Earth? b) Why is it said that an astronaut is never truly "weightles".
What are angles of refraction
a skydiver jumps out of a plane and fall 7.7 seconds before opening the parachute. what is the sky divers speed when
a car zooms around a curve radius 20 m at a speed of 20 ms.a. what is the centripetal acceleration of the car?b. how
in a race john runs 1.00 mile in 4.02 min mounts a bicycle and rides back to his starting point which is also the
A rollercoaster car has a mass of 600 kg when fully loaded with passengers. what is the force of the track on the car at the top of the hill
Review Conceptual Example 2 as an aid in solving this problem. An object is attached to the lower end of a 100-coil spring that is hanging fromthe ceiling. The spring stretches by 0.172 m. The spring is thencut into two identical springs of 50 coi..
A particular wire has a diameter of 1.7 mm and length of 1.3 m. If its resistance is 15 meter-Ohms, what is the resistivity of the metal from which it is made
A harp string plays the A above middle C, vibrating at itsfundamental frequency of 440 Hz. What is the distance between the nodes of the standing wave pattern
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