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A heat engine performs 267 J of work in each cycle while also delivering 189J of heat to the cold reservoir. Find the efficiency of the heat engine. Give your answer in percent (%) with 3 significant figures.
Suppose Fuzzy, a quantum-mechanical duck, lives in a world in which h = 2?J · s. What is the minimum uncertainty in the duck's speed
A wheel accelerates from rest to 12 rad/s at a rate of 78 rad/s^2. Through what angle (in radians) did the wheel turn while accelerating
Five grams of nitorgen gas at an initial pressure of3.0atm and at a 20 degrees celcius undergo an iobaric expansionuntil the volume has tribled. What is the gas volume after the expansion?
a small map shows new york to be 486 miles in a direction 8deg north of east from columbus. the same map shows that
When one person shouts at a football game, the sound intensity level at the center of the field is 62.4 dB. When all the people shout together, how many people are at the game
A solid spherical ball of mass 1.85 kg and radius 0.13 m rolls along a smooth, level surface with a speed of 2 m/s. The ball rolls up an inclined plane. How far up, vertical height, the plane does the ball go
two speakers that are in phase with each other are separated by a distance of 4.3 m and met a sound of frequency 221hz.
Two particles execute simple harmonic motion of the same amplitude and frequency along close parallel lines. What is their phase difference
A very narrow hole is drilled all the way through the Earth (through its center) and evacuated (i.e. there is neither air resistance nor friction). A small object of mass m is dropped into the hole at the surface.
At the end of an amusement park ride, you want the gondola to stop without the acceleration exceeding 2 g%u2019s. what is the maximum allowed braking force
a person of weight 80 kg jumped off a platform of height 1 m bounced off and ended up on the same platform. what is the
Two polarizers are out of alignment by 22.1°. If light of intensity 1.00 W/m2 and initially polarized halfway between the polarizing angles of the two filters passes through the two filters
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