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A sign has a mass of 1050 kg, a height h = 1 m and a width W = 4 m. It is held by a light rod of length 5 m that is perpendicular to a rough wall. A guy wire at 23° to the horizontal holds the sign to the wall. Note that the distance from the left edge of the sign to the wall is 1 m. Assume we rely upon friction between the wall and the rod to hold up the sign (there is no hinge attaching the rod to the wall). What is the smallest value of coefficient of friction? such that the sign will remain in place?
A load of 52.5 N attached to a spring hanging vertically stretches the spring 5.29 cm. What force is required to stretch the spring by this amount
The turntable of a record player has an angular speed of 9.7
In an experiment of centripetal force you have a rotating mass of 500 grams, which is at 5 cm from the axis of rotation. Calculate the angular velocity of the rotating mass
1. two radio antennas separated by d 300 m simultaneously broadcast identical signals at the same wavelength. a car
If an electroscope is charged by induction
A roller coaster at an amusement part starts out an a level track 50.0 m long and then goes up a 25.0 m incline at an angle of 30 degrees to the horizontal. what is its displacement from the starting point
imagine assembling four equal charges one at a time and putting them at the corners of a square. find the total work
In order for a car to turn along a curve in the road, it must experience a centripetal acceleration (according to an inertial observer). what force is responsible for providing this acceleration
A certain black body radiates 1200 W at a temperature of 2000 K. how much power does this body radiate at 3000 K
two parallel plates each having area a 2157.0cm2 are connected to the terminals of a battery of voltage vb 6.0 v. the
The drive shaft AB of an automobile is to be designed as a thin-walled tube. The engine delivers 125 kW when the shaft is turning at 1500 rev/min. Determine the minimum thickness of the shaft's wall
A particle (q=7.5*10^-6 C) is released from rest at a point on the x-axis, x = 10 cm. It begins to move due to the presence of a 2.0*10^-6 C charge which remains fixed at the origin. What is the kinetic energy of the particle at the instant it passe..
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