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The planet Neptune is 4.17×1012 from the Earth. Its diameter is 5.02×107 m. What diameter telescope objective would be necessary to just barely see Neptune as a disk rather than as a point of light? Assume a wavelength of 620 nm.
A 20 kg sled is being pulled along a horizontal stretch of snow covered ground by a horizontal force of 30 N. find the coefficient of kinetic friction between the sled and the snow
The earth's magnetic field, like any magnetic field, stores energy. The maximum strength of the earth's field is about 7.0 10-5 T. Find the maximum magnetic energy stored in the space
Boxes A and B have masses of 12 kg and 4 kg, in that order. The two boxes are released from rest. Use conservation of energy to find out the boxes speed when box B has fallen a distance of 00.5 m.
Laser beam with wavelength 632.8 nm is aimed perpendicularly at opaque screen with two identical slits on it, What are the double slit characteristics (slit width, slit separation)
A 60 kg man is ice-skating due north with a velocity of 6.0 m/s when he collides with a 36 kg child. What is the direction of the child's velocity just before the collision
A refracting telescope has an objective and an eyepiece that have refractive powers of 1.25 diopters and 300 diopters, respectively. Find the angular magnification of the telescope
A demonstration gyroscope consists of a uniform disk with a 41-cm radius, mounted at the midpoint of a light 58-cm axle, How fast is the gyroscope precessing, in units of rad/s, if the disk is spinning around the axle at 28 rev/s
A speedboat moves on a lake with initial velocity vector v1,x = 9.69 m/s and v1,y = -2.99 m/s, Find the speedboat's final speed
Hail comes straight down at a mass rate of m/?t = 0.080 kg/s and an initial velocity of v0 = -16 m/s and strikes the roof perpendicularly. calculate the force exerted by the hail on the roof
A 1.0-kg mass is attached to a string wrapped around a shaft of negligible mass and having a 8.0-cm radius. A dumbbell-shaped "flywheel" made from two 0.500-kg masses is attached to one end of the shaft and perpendicular to its axis. The mass is rele..
An object of mass m is on a frictionless table rotating with a given tangential speed vo with a radius of string ri. Find the final speed of the object after the rope was pulled down the distance d
James Stewart, 2002 Motocross/Supercross Rookie of the Year, is leading a race when he runs out of gas near the finish line. Determine the distance the racer travels before coming to a stop
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