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A young work crew is trying to quickly finish some touch-up painting to complete a job.Rather than setting up a secure work area, they decide to try a shortcut .Worker A will hold the far end of a 8.49 m work plank which weighs 113 N and is secured with a hinge on the opposite end.Worker B will stand on the plank 4.33 m from worker A.Worker B also brings up his paint can,mc=3.44 kg,which he places 0.370 m from where he is standing on the plank (between the two workers).Worker A unfortunately needs to supply 4.70 x 102 N of force to hold the end of the plank.How much does worker B weigh?the acceleration due to gravity is g=9.81 m/s2.
In a crash test, a test car of mass 1711 kg is moving at a speed of 37.2 m/s when it crashes into a wall. how much average power (in W) is expended in this process
In a skating stunt known as “crack the whip,” a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot.
A 10.0 kg object starting from rest falls through a viscous medium and experiences a resistive force R = - b v, Find the terminal speed of the object
questionan ideal gas is placed in a tall vertical cylinder with cross-sectional area a 0.1 m2.nbspa frictionless
A refracting telescope has an angular magnification of -92.00. The length of the barrel is 1.100 m. What are the focal lengths of the objective
you are preparing for a 5-day backpacking trip where you plan to use a gasoline cook stove for about 30 min each
Determine how much charge can be located on a capacitor with air between the plates before it breaks down if the area of each plate is 9.00 cm2
a small conductive rod of length 1.5 m moves with a constant velocity v14 ms in a direction parallel to a long wire
Light traveling in air enters a material at an angle of 25 degrees with respect to the normal. The refracted beam in the material makes an angle of 18 degrees with respect to the normal. Calculate the index of refraction of the material.
q1. you are designing a spherical tank to hold the water for a small village in a developing country. the volume of
A system does 136 J of work on its environment and gains 66 J of heat in the process. compute the change in the internal energy of the system
A 55.0 kg circus performer oscillates up and down at the end of a long elastic rope at a rate of once every 8s. The elastic rope obeys Hooke's Law. By how much is rope extended beyond its unloaded length while the performer hangs at rest?
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