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A heat engine does 7150 Joule of work per cycle while absorbing 11.2 kcal of heat from a high temperature reservoir. Estimate what is the efficiency of this engine?
Three identical stars of mass M = 1.9 x1030 kg form an equilateral triangle that rotates around the triangle's center as the stars move in a common circle about that center. The triangle has edge length L = 7.1 x1010 m. What is the speed of the st..
a heat lamp emits infrared radiation whose rms electric field is erms 3600 nc. a what is the average intensity of the
The coefficient of linear expansion of copper is 17 × 10-6 K-1. A sheet of copper has a round hole of radius 1.5 m cut out of it. what is the change in the area of the hole
The amplitude of an oscillator decreases to 88.8 of its initial value in 20.5. What is the value of the time constant
During an all-night cram session, a student heats up a 0.836 liter (0.836 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. How much coffee (in cubic meters) has spilled out of the beaker
Two speakers, 6.00 m apart, are driven by the same audio oscillator so that each one produces a sound consisting of two distinct frequencies, 1000 Hz and 1360 Hz. The speed of sound in the room is 350 m/s.
An idiot following a fire truck northbound up the side of the highway is going 70 mph while the fire truck is going 60 mph. What is the frequency heard by the idiot
A mortar crew is positioned near the top of a steep hill. Enemy forces are charging up the hill and it is necessary for the crew to spring into action.
Consider a block of mass m sliding down an inclined plane andit has three forces acting on it (1) a gravitational force(pointing down). (2) a normal force perpendicular to the surface ofthe plane. (3) a friction force opposing motion down the plan..
An object is projected horizontally. what are the three factors which determine the horizontal distance traveled, how the velocity changes in each direction
One gram of water changes from liquid to solid at a constantpressure of 1.00 atm and a constant temperature of 0°C. Find the change in the internal energy of the water
There are two stable isotopesof the element Lithium. One of them has three neutrons and the other has four. All other isotopes are radioactive withshort half lives. Using the periodic table in the textbook,
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