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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 small piece of dust of mass m = 1.6 g travels horizontally through an electric air cleaner in which the electric field is 511 N/C. What is the charge on the dust particle
The counterbalance w1 weighs 100 N. Find out the weight w2 and the angle α needed so that no force is exerted on the hip joint by the leg plus cast.
A potter's wheel, with rotational inertia 6.50 , is spinning freely at 16.0 . What is the subsequent angular speed of the wheel
An astronaut in a rocket passes a meter stick moving parallel to its long dimension. How fast is the rocket moving with respect to the meter stick
the escape speed starting from the surface of the earth is 11.2 km/s(neglecting any effects of the earth's orbital motion, what would be the escape speed from that planet
A box slides down a 25° ramp with an acceleration of 1.070m/s2. Resolve the coefficient of kinetic friction between box and ramp.
the head of the hammer m1.5kg moving at 4.5 ms strikes a nail and bounces back with the same speed after an elastic
A banked circular highway curve is designed for traffic moving at 85 km/h. The radius of the curve is 158 m. Traffic is moving along highway at 48 km/h on the rainy day. What is the minimum coefficient of friction between tires and road that would al..
A projectile is fired up into the air at a speed of 119 m/s at an angle of 23° relative to the horizontal. Determine the maximum height the projectile will reach.
Joey weighs 77 lb and sits on a seesaw at a distance of 30 inches from the fulcrum. Jenny weighs 67 lb and sits on the opposite side of the seesaw at a distance of 48 inches from the fulcrum. how far away from the fulcrum should he sit
The largest moon of Pluto, Charon, was discovered in 1979. Charon is in a circular orbit of radius 19,600 km around Pluto, What is the total mass of the Pluto-Charon system
A car (m = 2,000 kg) has an initial speed of 40 m/s and the driver applies the brakes over a distance of 200 meters until the car comes to a stop
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