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An ideal (Carnot) engine has an efficiency of 25%. If it were possible to run it backward as a heat pump, what would be its coefficient of performance?
Coherent light from a sodium-vapor lamp is passed through a filter that blocks everything except for light of a single wavelength. find the wavelength of the light that falls on the slits
A 251 kg wooden raft floats on alake. When a 76 kg man stands on theraft, it sinks 9.0 cm deeper into thewater. When he steps off, the raft vibrates for a while. What is the frequency of vibration
A 10.1-kg cannonball is fired from a 3,350 kg cannon with a velocity of 198 m/s. What is the speed of recoil of the cannon
If an electron moves perpendicular to the same magnetic field with this same translational speed, what is the radius of its circular orbit
How much thermal power is radiated by a light bulb when its filament is heated to 2000°C? Assume that the filament is a blackbody of area 1.0 cm2
If an automobile rounds this curve at 30 {rm m/s}, illustrate what is the minimum coefficient of static friction between tires and road needed to prevent skidding?
A uniform rectangular 87.25 kg refrigerator with height h = 2.089 m and width w = 1.115 m is pushed at a constant velocity across a level floor. The refrigerator is pushed in the horizontal direction halfway between the floor and the top of the refri..
A wire carrying a 29.0 A current passes between the poles of a strong magnet perpendicular to its field and experiences a 2.17 N force on the 4.00 cm of wire in the field
two point charges are separated by a distance of 1.5 c.m. and have charges of 2.0 micro c and 4.0 micro c respectively.
A ball player hits a home run,and the baseball just clears a wall 8.00 m high located124.0 m fromhome plate. The ball is hit at an angle of 39.1? to the horizontal, andair resistance is negligible.
A long horizontal hose of diameter 3.2 cm is connected to a faucet. At the other end, there is a nozzle of diameter 1 cm. detetmine the velocity of the water in the hose
A particular organ pipe can resonate at 231 Hz, 385 Hz, and 539 Hz, but not at any other frequencies in between. Is it an open or a closed pipe? What is the fundamental frequency of this pipe.
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