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A sphere that is a perfect blackbody radiator has a radius of 0.130 m and is at 250°C in a room where the temperature is 26°C. Calculate the net rate at which the sphere radiates energy.
_________W
A baseball player runs 27.4meters from batter's box to first base,overruns first base by 3.0 meters,and then returns to first base. Compared to the total distance traveled by the player,magnitude of the players total displacement from the batters ..
A rifle is aimed horizontally at a target 51 {rm m} away. The bullet hits the target 1.5 {rm cm} below the aim point. What was bullet's speed as it left the barrel.
A source has a half life of 30.2 years. It was created 19 years ago with an initial activity of 1 micro curie. Calculate the initial number of atoms in the sample
A 71-kg skier is going down a slope oriented 32° above the horizontal. Determine the pressure that each skier exerts on the snow
A skier of mass 73 kg is pulled up a slope by a motor-driven cable, What power (expressed in hp) must a motor have to perform this task
Imagine a very heavy cube of pure gold that is 1.23 m on a side. Approximate the atoms in this cube as little cubes, How far would the line stretch
A 2.00 meter long, straight rod is 1.00 mm in diameter an is made of pure copper (specific gravity 8.93). What is the potential difference between the ends on the wire
A particle has an acceleration of 6.19 m/s^2 for 0.350 s . At the end of this time the particle's velocity is 9.26 m/s What was the particle's initial velocity?
A 1000kg car moving 40m/s skids to a stop. During the skid, the only force is the frictional force between the tires and the road, What is the initial kinetic energy of the car
How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on? Explain how many revolutions would the wheel have made during this time?
Use approximate calculations assuming constant current during the output pulse. Calculate the ampere-hour rating of the battery so it lasts for five years.
A proton travels with a speed of 3.00 ? 106 m/s at an angle of 55.0° with the direction of a magnetic field of 0.520 T in the +y direction. determine the magnitude of the magnetic force on the proton
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