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The sun's rays are focused, using a lens as a "burning glass." All the visible sunlight entering a lens of radius 2.97 cm is concentrated in a circular spot of radius 1.05 mm. Find the intensity of visible light in the spot if the intensity of visible light striking the lens is 791 W/m2
A single-turn circular loop of radius 8.00 cm is to produce a field at its center that will just cancel the earth's field of magnitude 0.7G directed at 70 below the horizontal north direction. Find out the current in the loop.
A 2.18-m-long diving board of mass 13.2 kg is 3.00 m above the water. It has two attachments holding it in place. what are the forces acting on the two attachments
Consider a binary separator used to separate aluminum cans from glass. A total mass of 0.8 tonne/hr enters. what is the recovery of aluminum
The team monitoring a space probe exploring the outer solar system finds that radio trasmissions from the probe take 1.71 hours toreach earth. How distant (in meters) is the probe?
if the block is raised back to 100 meters without gaining or losing heat from the environment, What is the blocks temp after it was raised
The threshold of hearing is defined as the minimum discernible intensity of the sound. It is approximately . Find the distance from the car at which the sound from the stereo can still be discerned. Assume that the windows are rolled down and that ea..
Percy did 1000 joules of work and exerted a power of 2 watts. How many seconds did Percy take to do his work
A woman throws a ball at a vertical wall d = 3.0 m away. The ball is h = 1.5 m above ground when it leaves the woman's hand with an initial velocity of 12 m/s at 45°. How long was the ball in the air after it left the wall
A box starts out at the top of a frictionless ramp, then slides down. The ramp has a height h = 2 meters, What is the kinetic energy of the box at the bottom of the ramp
A thin film of acetone is floated on a thick glass plate .plane light waves of variable wavelengths are incident normal to the film.when one views the reflected wave it is noted that the complete destructive interference occurs at 600 nm and const..
A laser pulse has an energy of 16 J and a beam radius of 2 mm. The pulse duration is 11 ns and the energy density is constant within the pulse. What is the spatial length of the pulse
An emf of 10 V is connected to a series RC circuitconsisting of a resistor of 1.3 x 106 Ω and a capacitor of2.9 µF. Find the time required for the charge on the capacitor to reach 89% of its final value.
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