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A 9.0 cm-diameter disk emits light uniformly from its surface. 20 cm from this disk, along its axis, is an 7.0 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?
The record distance in the sport of throwing cowpats is 81.1 m. This record toss was set by Steve Urner of the United States in 1981, Determine the initial speed of the projectile
A small space telescope at the end of a tether line of length L moves at linear speed v about a central space station. What will be the linear speed of the telescope
Two tuning forks oscillating coherently and in phase at 12000Hz are separated by 0.35m. What is the phase angle difference between the waves
A 20-m long spacecraft is passing by earth at 0.8c. What is the length of the spacecraft measured within the moving (spacecraft) referencee frame
A mass of 10kg is sliding up a frictionless plane inclined at 10 degree. How far does the mass move up along the plane
A mass of .5Kg is attached to a massless spring with spring constant k=600N/m, What was the incident speed of the second mass
A force given by F(x) = 5x3 (in N/m3) acts on a 1-kg mass moving on a frictionless surface. The mass moves from x = 3.87 m to x = 6.09 m. How much work is done by the force
A 6.0-cm-diameter horizontal pipe gradually narrows to 4.0 cm. When water flows through this pipe at a certain rate, What is the volume rate of flow
The flow rate of blood through the average human aorta, of radius 1.0 cm, is about 90 cm^3/s. What is the speed of the blood flow through the aorta
A 2.90 box is moving to the right with speed 8.50 on a horizontal, frictionless surface, What distance does the box move from its position at before its speed is reduced to zero
A ray of light makes an angle of 25 degrees with the normal to a plane mirror. through what angle is the reflected ray rotated
In a certain binary-star system, each star has the a mass of 1.00 multiply.gif 10^30 kg, What is their period of revolution in Earth years
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