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Three liquids are at temperatures of 12 ?C, 23?C, and 29?C, respectively. Equal masses of the ?rst two liquids are mixed, and the equi- librium temperature is 16?C. Equal masses of the second and third are then mixed, and the equilibrium temperature is 25.7?C. Find the equilibrium temperature when equal masses of the ?rst and third are mixed. Answer in units of ?C.
An 18-year-old runner can complete a 10.0-km course with an average speed of 4.80 m/s. How much later (in seconds) should the younger runner start in order to finish the course at the same time as the older runner
Skater A, mass 55.0 kg, moving at 14.0 m/s bumps into stationary Skater B, mass 65.0 kg. After the collision, Skater A moves at an angle of 53.1o from her original direction, What are the final speeds of the two skaters
A copper vat is 12 m long at room temperature (20 degrees Celsius). How much longer is it as it contains boiling water at 1 atm pressure.
a very long solid cylinder of radius r 4 cm has a uniform volume charge density ?a. how much total charge is contained
An electromagnetic wave strikes a 1.69-cm2 section of wall perpendicularly. The rms value of the wave's magnetic field is4.84 x 10-4 T. How long does it take for the wave todeliver 1120 J of energy to the wall?
You have one lens with a focal length f1=+43.2 cm. If you want to produce an image of the bulb that is enlarged by a factor of 2.90, how far from the wall should the lens be placed
Suppose you wanted to be able to see small details on the Moon using an optical telescope. What is the smallest diameter of the objective lens
Calculate the angular velocity of a clock's second hand. State in rad/s. and Calculate the angular velocity of a clock's minute hand
A 150 gram aluminum cup contains 1100 gram of water in thermal equilibrium with the cup at 80°C. Find at what rate is energy being removed
Bob heads out into a lake at an angle of 30? with respect to the shore. If his boat is capable of a speed of 1.3 m/s, how far from land will he be in 5 min and 37 s
A 45 kg woman cheats on her diet and eats a 439 Calorie (439 kcal) jelly donut for breakfast. If the human body is only 28% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakfas..
A woman stands on the edge of a cliff and throws a stone vertically downward with an initial speed of 10 m/s. the instant before the stone hits the ground below, it has 450 j of kinetic energy. if she were to throw the stone horizontally outward from..
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