Problems class 5. Newton\'s Law of Motion 1) a woman weighs1 2) a 3.00 kg object

Question

Problems class 5. Newton's Law of Motion 1) a woman weighs1 2) a 3.00 kg object undergoes an acceleration given by 2,.00+5.00 m/s. Find (e) the resultant force acting on the object and (b) the magnitude of the resultant force. 3) a 4 kg puck has a velocity of 3,00i and air resistance and assuming the force applied is constant find (a) the components of the force its magnitude 4) an electron of mass 9.11 x 10 11 kg has an initial speed of 3.00 x 105 m/s, it travels in a straight line and its speed increases to 7.00 x 10 m/s in a distance of S cm. assuming it's acceleration is constant, (a) determine the magnitude of the force exerted on the electron, (b) compare this force with the weight of the electron 5) two forces F1 and F2 act of a 5kg mass. Taking F,-20 N and 15N find the accelerations of the objects for the configurations shown below (a) and (b i m/s, 8 seconds later the puck has 8.00/+10.00jm/s. ignoring friction and (b) b) Fi 6) A 1000 kg car pulls a 300 kg trailer. Together they accelerate at 2.15 m/s. Ignoring drag and friction determine (a) the net force on the car, (b) the net force on the trailer, the force exerted by the trailer on the car, (d) the resultant external force exerted by the caron the road 7) assume the three blocks shown below move on a frictionless surface and a 42N force acts on the 3kg block. Determine (a) the acceleration, (b) the tension in the cord connecting the 1 and 3 kg block, (c) the force exerted by the ikg block on the 2kg block 42N 1.0kg 2.0 kg 3.0 kg 8) the distance between two telephone poles is 50m, a 1kg bird lands midway between the poles and the wire sags 20cm, (a) draw the free body diagram, (b) how much tension does the bird produce in the wire? 9) a block with an initial velocity of 5 m/s travels up a frictionless incline of 20. How far up the incline does the block slide before coming to rest 10) two blocks connected by a rope, of negligible mass, are dragger forward with a horizontal force of 68.0 N. M1 and M2 are 12.0 and 18.0 kg respectively and the coefficient of f surface is 0.100. Determine the acceleration of the system and the tension in the rope.

Explanation / Answer

Ans (1 ) 1 lb= 4.448 N     so 120 lb= 120*4.448 N= 533.76 N

              1 kg=2.2 lb        so 120 lb= (1/2.2)*120= 54.545 kg

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