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Late one night on a highway, a car speeds by you and fades into the distance. Under these conditions the pupils of your eyes have diameters of about 6.7 mm. The taillights of this car are separated by a distance of 1.2 m and emit red light (wavelength = 671 nm in vacuum). How far away from you is this car when its taillights appear to merge into a single spot of light because of the effects of diffraction?
A person weighs 689 N and the head is 53 N the average density of the person is 1010 kg/cubed meters how much force in N is required to keep a persons head out of the water.
A 50 kg person is riding a Ferris wheel. The Ferris wheel consists of 8 metal cars, each with mass 1500 kg located 15 m from the center. What is the angular acceleration of the Ferris wheel
A playground merry-go-round has a disk-shaped platform that rotates with negligible friction about a vertical axis. how fast will the disk be turning
A baseball (m = 145 g) approaches a bat horizontally at a speed of 40.5 m/s (91 mi/h) and is hit straight back at a speed of 45.9 m/s, what is the average force exerted on the ball by the bat
A laser beam is traveling through an unknown substance. When it encounters a boundary with air, the angle of reflection is 28.2°, What is the index of refraction of the substance
The following charges are located inside a submarine: 4.00, -8.00, 25.0, and -60.0. find the net electric flux through the hull of the submarine
What is the size of the force on the wireA horizontal wire of length 3.0 m carries a current of 6.0 A and is oriented so that the current direction is 50° S of W. What is the size of the force on the wire
A rocket ship at rest in space gives a short blast of its engine, firing 90 kg of exhaust gas out the back end with an average velocity of 700 m/s.
The magnetic field B at the center of a circular coil of wire carrying a current I (as in fig. 20-9) is where N is the number of loops in the coild and r is its radius. estimate the magnetic field strength at the center of coil
A student places an object on the 5.0 cm mark of the meter stick. He places a positive lens that he knows has a focal length of 15.0 cm at the 30.0 cm mark on the meter stick. From the data what is the focal length of the negative lens
Calculate the gravitational force on a spacecraft 8700km above the Earth's surface if its mass is 1200kg
A 10 kg crate is pulled up a 30 degree incline with a rope parallel to the incline. The tension in the rope is 100 N. what is the acceleration of the crate up the incline
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