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A highly polished silver hemisphere of radius R rests with its base on a level table. A parallel beam of light with circular cross section and diameter D shines vertically down on the hemisphere. The central axis of the beam coincides with the symmetry axis of the hemisphere. What must be the diameter of the beam if light from the outer edges of the beam is reflected horizontally?
A concave mirror has a focal length of 20 cm. A paraxial beam of light coming from a distant object forms its image at the focal point. compute where is the final image
Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this, find the average force on the truck driver from the seatbelt
A particle of charge +15 µC and mass 2.00 10-5 kg is released from rest in a region where there is a constant electric field of +280 N/C
A 8000 %u03A9 resistor is joined in series with a 10 %u03BCF capacitor. What is the capacitive time constant of this combination
Find out the recoil velocity that the raft. At what height above the cannon should the net be placed in order to catch the daredevil.
a 20 kg mass sits on an inclined plane with friction making an angle of 50 degrees with respect to the horizontal. calculate the frictional force required to keep the mass from sliding down the incline
You're driving down the highway late one night at 18 - {rm m}/{rm s} when a deer steps onto the road 45 -{rm m} in front of you. Your reaction time before stepping on the brakes is 0.50- {rm s}, and the maximum deceleration of your car is 11 {rm m..
Light shone from a mystery material into water undergoes total internal reflection at an angle of 33.4 degrees. What is the index of refraction of the mystery material?
In a Compton collision, if the wavelength of the photon is 1.00 pm, what is the speed of the scattered electron
If 45 g is suspended at 25 degree, 105 g is suspended at 85 degree, and 65 g is suspended at 330 degree, what mass must be suspended at what angle to balance these three forces?
You have made a raft to transport your fortune in gold across the lake. What is the maximum mass of gold you can carry without sinking the raft
A boy in a wagon is moving at 3.1 m/s east when another boy begins pulling on the wagon in the direction opposite to its motion at 1.25 m/s^2. (a) How long does it take to give the wagon a velocity of 7.4 m/s west? (b) How far from the starting po..
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