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An aluminum cup contains 225 gram of water and a 40 gram copper stirrer, all at 27°C. A 450 gram sample of silver at an initial temperature of 86°C is located in the water. The stirrer is used to stir the mixture gently until it reaches its final equilibrium temperature of 32°C. Evaluate what the mass of the aluminum cup.
If a 0.34kg kickball is rolled towards a kicker at 8.1m/s and then is kicked at its velocity of -12.0m/s, what impulse is acting in the kickers foot
an 84-o resistor and a 74-o resistor are connected in series across a battery. the voltage across the 84-o resistor is
An ice cube is placed in a microwave oven. Suppose the ovendelivers 97 W of power to the ice cubeand that it takes 32170 J to melt it. How long does it take for the ice cube to melt
An optical system is designed so that an object for a convex spherical mirror of focal length f=15 cm is 20 cm behind the mirror, determine whether the image is real or vertual, erect or inverted
question a transformer with a turns ratio secondaryprimary of 114 is used to step down the voltage from a 120-v wall
A photon of wavelength 0.73130 nm strikes a free electron that is initially at rest. The photon is scattered straight backward. What is the speed of the recoil electron after the collision?
points a and b have electric potentials of 249 v and 129 v respectively. when an electron released from rest at point a
Astronomers discover an exoplanet (a planet of a star other than the Sun) that has an orbital period of 3.35 Earth years in its circular orbit around its sun, Find the radius of the exoplanet\'s orbit
A mirror produces an image of the sun, and the image is located 0.9800 m from the mirror. What is the object height ho of the tree
Find the time it takes for a telephone call to go by way of satellite between these cities. Ignore the curvature of the earth.
A bluray disc is 12cm in diameter. When you put it into the player it takes 30 seconds for the disc to accelerate to its playing speed; 1500 revolutions per minute. find number of revolutions the disc makes
the same object is located at the same distance from two spherical mirrors a and b. the magnifications produced by the
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