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In the figure below a crowbar is used to lift a weight. If a down ward force of 228 N is applied to the end of the bar, how much weight does the other end bear? The crowbar itself has negligible weight. (Let r1 = 29.0 cm and r2 = 4.70 cm.)
a street light is supported by two wires and each makes a different angle from each other. the one on the left is 32
An extension cord made of two wires of diameter 0.129cm (no. 16 copper wire), How much power is dissipated in the cord
A 12-kg box is free from the top of an incline that is 5.00m long and makes an angle of 40 degrees to the horizontal. A 60-N friction force impedes the motion of the box.
A 10-turn circular coil of wire has a di- ameter of 0.45 m. What is the strength of the average emf generated in the coil
a magnetic field goes from the top to the bottom of this page. what direction will a proton moving from left to the right deflect
A parallel-plate air capacitor of area A=17.0cm2 and plate separation d=3.40mm is charged by a battery to a voltage 56.0 V. how much additional charge will flow from the battery onto the positive plate
Trin has been prescribed bi-focals because his near point is at 2 m instead of 25 cm and his far point is at 10 m instead of infinity. Describe what's wrong with his eyes
A beam of nuclei is used for cancer therapy. Each nucleus has an energy of 108 MeV, How many nuclei are in the beam
Two converging lenses are placed 88.0 cm apart. An object is placed 1.100 m to the left of the first lens, What is the focal length of the second lens
An observation satellite orbits the planet at a height of 1000. What is the projectile's speed as it passes the satellite
A small droplet of oil with mass of 3.04×10-15 kg is held suspended in a region of uniform electric field directed upward with a magnitude of 5325 N/C
A cockroach of mass m lies on the rim of a uniform disk of mass 8 m that can rotate freely about its center like a merry-go-round. determine the angular velocity of the cockroach-disk system
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