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A 50.0 g silver spoon at 20.0 °C is placed in a cup of coffee at 90.0 °C. How much heat does the spoon absorb from the coffee to reach a temperature of 89.0 °C?
Compute the temperature at which a tungsten filament that has an emissivity of 0.35 and a surface area of 3.0*10-5 m2 will radiate energy at the rate of 15 W in a room where the temperature is 13°C.
A roller coaster car of mass 250 kg has a speed of v0 = 12 m s-1 at point A, located at a height of h = 15 m. Find the speed of the car when it reaches point B. Use energy ideas
A father pulls his identical twins on identical sleds tied one after the other. He exerts a force F that makes an angle of 30degrees with the horizontal, What is the tension in the rope that he is pulling
A car travels 2.87 km in the x-direction, then turns left 59.7? to the original direction and travels an additional distance of 2.65 km. Calculate the x component of the car's net displacement
An egg is thrown nearlyvertically upward froma point near the cornice of a tall building.it just misses the cornice on the way down, how high does it rise above its starting point
the earth has an angular speed of 7.272middot10-5 rads in its rotation. find the new angular speed if an asteroid m
A bowling ball has a mass of 6.2 kg and a radius of 18 cm. If it is rolling down a lane with a speed of 8.6 m/s, what is the angular momentum of the ball
A 30 g ball of clay is thrown horizontally at 20 m/s toward a 1.7 kg block sitting at rest on a frictionless hi surface. The clayts and sticks to the block. What is the speed of the block and clay right after the collision?
A bowling ball weighing 71.2 is attached to the ceiling by a 3.80 rope. The ball is pulled to one side and released; it then swings back and forth like a pendulum. As the rope swings through its lowest point, the speed of the bowling ball is measured..
question1a current of 1a is injected into the earth at the bottom of a borehole. derive an expression for the voltage
A dynamite blast at a quarry launches a rock straight upward, and 1.9 s later it is rising at a rate of 18 m/s. assuming air resistance has no effect on the rock, compute its speed (a) at launch and (b) 4.6 s after launch.
A toy train rolls around a horizontal 1.1 meter diameter track. The coefficient of rolling friction is 0.10. Find the magnitude of the train angular acceleration after it is released
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