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A 8.0-cm -diameter disk emits light uniformly from its surface. 20 cm from this disk, along its axis, is an 9.0-cm -diameter opaque black disk; the faces of the two disks are parallel. 20 cm beyond the black disk is a white viewing screen. The lighted disk illuminates the screen, but there's a shadow in the center due to the black disk.
What is the diameter of the completely dark part of this shadow?
A piece of iron is heated with a torch to a temperature of 558 K. How much more energy does it emit as blackbody radiation at 558 K than it does at room temperature, 290 K
The distance to the moon can be found with the help of mirrors left on the moon by astronauts. calculate the distance from the earth to the moon
An electron that is moving through a uniform magnetic field has a velocity v = (30 km/s)i + 18 km/s)j when it experiences a force F = (-4.000×10-15 N)i + (6.667×10-15 N)j due to the magnetic field. If Bx = 0, calculate the magnitude of the magnetic f..
A certain speed boat weighs 5,880 N. It can accelerate from 0 to 40 m/s in 5 seconds. (Need to see the math). How large is the net force acting on the boat
A skateboarder shoots off a ramp with a velocity of 5.1 m/s,directed at an angle of 59° above the horizontal. The end ofthe ramp is 1.4 m above the ground.
You are given 65.000 cm of copper wire with diameter 7.0000 mm. compute At what rate is thermal energy generated in the loop
a kangaroo jumps at an angle of 80deg above the horizontal with a velocity of 15 ms. if the mass of the kangaroo is 75
What is the maximum speed of the ball.
inside an insulated container a 250-g ice cube at 0 degc is added to 200 g of water at 18 degc.i what is the final
A deuteron (the nucleus of an isotope of hydrogen) has a mass of 3.34×10?27kg and a charge of 1.60×10?19C, Find the speed of the deuteron
a positive point charge q 6.6 x 10-8 c is surrounded by an equipotential surface a which has a radius of ra 2.7 m. a
Trin has been prescribed bi-focals because his near point is at 2 m instead of 25 cm and his far point is at 10 m instead of infinity. Describe what's wrong with his eyes
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