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A 10 kg uniform ladder , 5.0 m long is placed against a smooth wallat a height of 3.1 m. The base of the ladder rests on a roughhorizontal surface whose coefficient of static friction is 0.40. An80 kg block is suspended from the top rung of the ladder, close tothe wall. What is the force exerted on the wall by the ladder?
A square wire 2.0 cm on each side is oriented so that 5.00 mT magnetic field makes a 30 degree angle with the normal to the plane of the square. if a 1.0 mA current causes a 25 N x m torque on the wire, how many loops does the wire make?
A cockroach of mass m lies on the rim of a uniform disk of mass 7.00 m that can rotate freely about its center like the merry-go-round. At first the cockroach and disk rotate together with an angular velocity of 0.220 rad/s. Then the cockroach walks ..
A ditch d = 1.80 m wide crosses a trailbike path. An upward incline of = 14° has beenbuilt up on the approach so that the top of the incline is levelwith the top of the ditch. What is the minimum speed a trail bike must be moving to clear the ditc..
A hot-air balloon is rising straight up with a speed of 1.82 m/s, How much time elapses before the ballast bag hits the ground
mitch throws a 50 gram lump of clay with a speed of 20 m/s at a 500 gram target, find the coefficient of friction between the target and the surface
A mass pulled by a constant force accelerates from 10 cm/s to 25 cm/s in 3.5 s. what is the magnitude of the second force
In Rutherford’sfamous scattering experiment that led to the planetary model of theatom, alpha particles (having a charge of + 2e and a mass of 6.64 x10-27 kg) were fired toward a gold nucleus with charge of + 79e. Thealpha particle, initially very..
The world's largest refracting telescope is operated at the Yerkes Observatory in Wisconsin. It has an objective of diameter of 1.02 m. What is the minimum separation of two objects on the ground
A heat engine is to be built to extract energy from the temperature gradient in the ocean. what is the maximum efficiency such an engine can have
A cylinder containing an ideal gas has a volume of 2.0m3 and a pressure of 1.0*105 Pa at a tempof 300 K. The cylinder is placed against a metal block thatis maintained at 900 K and the gas expands as the pressure remainsconstant until the temp of t..
A satellite in geosynchronous orbit above the moon will go around once in 27.3 days. what is the orbital radius of the satellite
A child exerts a tangential 47.6 {N} force on the rim of a disk-shaped merry-go-round with a radius of 2.10 {m}. If merry-go-round starts at rest and acquires the angular speed of 0.080 {rev/s} in 3 {s}, what is its mass.
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