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The shipment of the new physics supplies have arrived. They are placed on the freight elevator and transported up to the third floor for delivery to the physics rooms. The free body diagram at the right depicts the forces acting upon the freight elevator as it begins its ascent through the elevator shaft. Use force values to determine the net force, the mass and the acceleration of the elevator. The values of the individual forces are:
Ftens = 2340 N Fgrav = 2120 N Fnorm1 = Fnorm2 = 276 N.
A man with a mass of 90 kg is skiing at a speed of 20 m.s-1 when he reaches the bottom of a 20 m slope. He goes up the slope without exerting any other forces to help him. Ignore friction. Will he reach the top of the slope? Show all calculations.
A car travelling at a speed of 50 mph. The driver saw a roadblock 80m ahead and stepped on the brake causing the car to decelerate uniformly at 10 m/s². Find the distance from the roadblock to the point where the car stopped. Assume perception reaction time is 2 seconds.
a train moving with constant acceleration travels 24ft. during the 10th sec of its motion and 18 ft during the 12th sec of its motion.
a. find its initial velocity
b. Compute the time required for the train to stop
c. How many feet will the travel before coming to rest?
Considering vector A = 100 N, directed to the East and vector B = 75 N, 60° from positive x-axis, capture the image of the resultant vector A - B. Then, try to find the resultant vector using the Law of Sines and Cosines
