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A carnot's engine has the same efficiency between 1000K and 500K and between x K and 1000K (this being the temperature of this skins in this case). Calculate x ?
An observer moving toward Earth with a speed of 0.94c notices that it takes 5.2 min for a person to fill her car with gas. Suppose, instead, that the observer had been moving away from Earth with a speed of 0.78c. How much time would the observer ..
Two forces act on a car. Force A is 120 N, west and force B is 200 N at 60° N of W. What is the direction of the resultant force on the car
Two identical guitar strings are prepared such that they have the same length (2.17 m) and are under the same amount of tension. find the wave propagation speed on the guitar strings
If the mass of a wheel is increased by a factor of 20 and the radius is increased by a factor of 3, find by what factor is the moment of inertia increased
A copper wires with resistivity 1.72 ×10-8 Ω•m, is 930 meter long and 3 millimeter in diameter. Evaluate what is the resistance of the wire
A crate is sliding down a ramp that is inclined at an angle 33.1 ° above the horizontal. Find the acceleration of the moving crate
an object is 19 cm in front of a diverging lens that has a focal length of -9 cm. how far in front of the lens should
A straight, stiff, horizontal wire of length 30 cm and mass 60 g is connected to a source of emf by light, flexible leads. A magnetic field of 1.5 T is horizontal and perpendicular to the wire. Find the current necessary to float the wire; that is, f..
700 g of an unknown metal powder at Thot = 78°C are dropped into a negligible heat capacity calorimeter containing 140 g of water at 11°C, Calculate the specific heat of the metal powder
1 to work on your car at night you use an extension cord to connect your work light to a power outlet near the door.
a 1.60103 kg car rounds a circular turn of radius 22.0 m. if the road is flat and the coefficient of static friction
Explore the hypothesis of "desertification" by determining the distances required to evaporate a fully formed spherical raindrop (~2 mm diameter) from typical cumulus cover at 2500m. Let h=height(m) above land at sea level.
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