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Figure shows three ropes tied together in a knot. One of your friends pulls on a rope with 3 units of force and other pulls on a second rope with 5 units of force. How hard and what direction must you pull on the third rope to keep the knot from moving?
A hot-air balloon is rising upward with a constant speed of 3.88 m/s. When the balloon is 7.87 m above the ground, How much time elapses before the compass hits the ground
An engine has a hot-reservoir temperature of 910 K and a cold-reservoir temperature of 530 K. What is the efficiency of the engine
A small button placed on a horizontal rotating platform with diameter 0.328 will revolve with the platform when it is brought up to a rotational speed of 45.0 rev/min , provided the button is a distance no more than 0.141m from the axis. a)What is..
What is the greatest angle of elevation
A physics student has designed a winter game. He has a platform 4.6 meters high with a rope tied to a tree at the same height, how fast are the boys and the sled moving after they "collide"
In Anchorage, collisions of a vehicle with a moose are so common that they are referred to with the abbreviation MVC. What percent of the original kinetic energy is lost in the collision to other forms of energy
A car starts from rest with an acceleration of 3 m/s/s. How far will the car travel in 6s? What is the velocity of the car after 6s
A cylindrical permanent magnet has a volume of 202 cm3 and a uniform magnetization of 1.0 106 A/m along its axis. Find the magnetic torque exerted on the magnet
A duck has a mass of 2.4 kg. As the duck paddles, a force of 0.06 N acts on it in a direction due east. Find magnitude and direction south of east
In a darkened room we place a lighted tungsten bulb in a box that has one end covered with tinfoil. If we make a pinhole in the tinfoil, an image of filament appears on a screen facing the tinfoil.
if the barge can only be pushed 20-cm deeper into the water before water overflows to sink it, how various 400-kg horses can it carry.
At a coal-burning power plant a steam turbine is operated with a power output of 548 MW. At what rate must heat be supplied to the power plant by burning coal
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