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The paint used on highway signs often contains small transparent spheres which provide nighttime illumination of the sign's lettering by retro-reflecting vehicle headlight beams. Consider a light ray from air incident on one such sphere of radius r and index of refraction n. Let theta be its incident angle, and let the ray follow a path such that the ray exits the sphere in the direction exactly antiparallel to its incoming direction. Considering only rays for which sin(theta) can be approximated as theta, determine the required value for n.
A cylindrical conductor has resistance of R0 = 200 ? (ohms). what's the value of the new resistance in ohms
A 7.52 nC charge is located 1.68 m from a 4.30 nC point charge. Find the magnitude of the electrostatic force that one charge exerts on the other
A 5.6cm diameter horizontal pipe gradually narrows to 4.6cm . When water flows through this pipe at a certain rate, What is the volume rate of flow
what is a catapult ? what is the traditional use of a catapult ? when were catapults in greatest use ? what
sound is detected when a sound wave causes the eardrum to vibrate. typically the diameter of the eardrum is about 8.4
An object of mass 10.0 kg is released from the top of an inclined plane which makes an angle of inclination of 30.0? with the horizontal. The object slides along the inclined plane
The mass of the moon is 7.36 × 1022 kg and its distance to the Earth is 3.84×108m. What is the gravitational force of the moon on the earth
A person is sitting at an angle θ off to the side of a diffraction horn that has a width D of 0.069 m. This individual does not hear a sound wave that has a frequency of 8700 Hz. When she is sitting at an angle of Π/2, the frequency that she does ..
A ball moving with a velocity of 8.3 m/s collided with a ball of the same mass but moving at a velocity of - 6.5 m/s. If the coefficient of restitution of the collision is 0.80. What is the velocity of the two balls after the collision?
A neutron decays into a proton and an electron. Write the decay reactions of a neutron using both nucleons and quarks. You will need to show two reactions.
A soap film (n= 1.33) is contained within a rectangular wire frame. The frame is held veritcally so that the film drains downward and forms a wedge with flat faces. What is the wedge angle of the film
a tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.02 ms. the car is
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