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An astronomical telescope has an angular magnification of -144 and uses an objective with a focal length of 62.6 centimeter. Determine what is the focal length of the eyepiece?
the rope and pulley have negligible mass and the pulley is frictionless. the coefficient of kinetic friction between
q1. radio amateurs are permitted to communicate on the 20-meter band. what frequency of radio waves corresponds to a
A blacksmith heats a 1.9 kg iron horseshoe to 480 degree C, then plunges it into a bucket containing 10kg of water at 20 degree C. The specific heat of iron is 447 J/kgK. What is the final temperature.
a particle with mass 2.30 g and charge 10.0 c enters through a small hole in a metal plate with a speed of 8.50 ms at
A 32-lb block is attached to a cord that is wrapped around the rim of a flywheel of diameter 1 ft and hangs vertically, as shown. The rotational inertia of the flywheel is 0.5 slug × ft2. When the block is released and the cord unwinds, the accelerat..
The average speed of a nitrogen molecule in air is about 6.70 e2m/s, and its mass is about 4.68e-26 kilogram. Find what average force does the molecule exert on the wall
A window air-conditioner unit absorbs 9.70×104J of heat per minute from the room being cooled, What is the energy efficiency rating of the unit
A 1.75 kg block at rest on a ramp of height h. When the block isreleased, it slides without friction to the bottom of the ramp, andthen continues across a surface that is frictionless except for arough patch of width 10.0 cm that has a coefficient..
Traveling at a speed of 15.2 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. What is the speed of the automobile after 1.15s have elapsed
Find the charge-to-mass ratio of an unknown point charge that is repelled strongly enough from a single electron to be suspended motionless against its own weight
A 15.0 kg bucket of water is suspended by a ropewrapped around a windless, that is a solid cylinder 0.500 m indiameter with mass 11.0 kg. With what speed does the bucket strike the water
a car starts from rest on a circular track that has a radius of 300m. it accelerates with a constant tangential
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