A student uses a force P of magnitude 55 N and angle 0 = 75° to push a 4.0 kg block across the ceiling of the room, as shown below. If the coefficient of kinetic friction between the block and the ceiling is 0.25, what is the magnitude of the acceleration of the block?
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- Consider an object on an incline where friction is present. The angle between the incline and the horizontal is θ and the coefficient of kinetic friction is μk. Find an expression for the acceleration of this object. Treat down the incline as the positive direction. a=?A horizontal force, F1 = 75 N, and a force, F2 = 12.5 N acting at an angle of θ to the horizontal, are applied to a block of mass m = 2.1 kg. The coefficient of kinetic friction between the block and the surface is μk = 0.2. The block is moving to the right. Solve numerically for the magnitude of the normal force, FN in Newtons, that acts on the block if θ = 30°. solve numerically for the magnitude of acceleration of the block, a in m/s2, if θ = 30°.Two horizontal forces, P and Q, are acting on a block that is placed on a table. We know that P is directed to the left but the direction of Q is unknown; it could either be directed to the right or to the left. The object moves along the x-axis. Assume there is no friction between the object and the table. Here P = −4.9 N and the mass of the block is 4.4 kg What is the magnitude and direction of Q (in N) when the block moves with constant velocity? What is the magnitude and direction of Q (in N) when the acceleration of the block is +6.3 m/s2 Find the magnitude and direction of Q(in N) when the acceleration of the block is −6.3 m/s2
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