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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?
An empty storage tank has a volume of 140 ft3. What is the buoyant force exerted on it by the air
A 500g ball swings in a vertical circle at the end of a 1.5-m-long string. When the ball is at the bottom of the circle, the tension in the string is 12N
Two objects attract each other gravitationally with a force of 3.0×10-10 N when they are 0.60 m apart. Their total mass is 4.0 kg. Determine their individual masses.
While at the county fair, you decide to ride the Ferris wheel. Having eaten too many candy apples and elephant ears, you find the motion somewhat unpleasant. What is the magnitude of your acceleration
If you start with two sinusoidal waves of the same amplitude traveling in phase on a string and then somehow phase-shift one of them by 12.50 wavelengths
A uniform disk has a mass of 3.7 kg and a radius of 0.40 m. The disk is mounted on frictionless bearing and is used as a turntable. What is the final angular momentum of the system
A spelunker is surveying a cave. She follows a passage that takes her a distance 189 straight west, then a distance 220 in a direction 45 east of south, after that a distance 280 at 30 east of north. After a fourth unmeasured displacement she find..
A 1830 kg car traveling at 12.9 m/s collides with a 2980 kg car that is initally at rest at a stoplight. find the coefficient of kinetic friction between the cars and the road
You drop a 1.5 kg textbook to a friend who stands on the ground 10 m below the textbook with outstretched hands 1.50 m above the ground. What is the speed of the textbook when it reaches the hands? m/s
The magnetic field near the surface of a neutron star has a magnitude of 1.00 108 T. Find the acceleration of an electron near the star moving at 1.08 107 m/s
A 1500kg car starts from rest and drives around a flat 52-m-diameter circular track. at what time does the car begin to slide out of the circle
A radio tuner is built by connecting an L=0.41mH inductor and variable capacitor in series with an antenna. The driving voltage is provided by the radiowaves that pass through the antenna, and the total internal resistance of the circuit is R=1.2O..
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