9) Approximately how much force is needed to lift the weight?
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- 1.) A car that weighs 4000 Ibs. (1814 kg), crashes into a wall. What is the impulsive force (F) if the car goes from 55 mph (88.5 km/h - 24.6 m/s) to 0 m/s in 0.3 sec? Force Units 2.) What if the same car, traveling at the same speed as before, had "crumple zones" (longer time to stop). When this car hits the wall, it takes 0.75 seconds to come to a rest. What is the new impulsive force (F) on the driver? Force - Units 3.) In a car collision, the driver's body must change speed from a high value to zero. This is true whether or not an airbag is used. How does an airbag reduce injuries? 4.) A baseball is pitched at 35 m/s is hit by a batter. After leaving the bat, the ball has a velocity of 50 m/s. The ball weighs 0.15 kg. The time elapsed during the collision was 0.0015 seconds. What was the force (F) exerted on the baseball? Hint: Watch your signs of the velocities, the direction changes. Force = UnitsA uniform 25kg bar, 6.0m long is suspended by a cord shown. What is the tension in the cord? wall cord 27° -6.0 m- 3.7 x 102 N 02.7 x 10² N 1.2 x 10² N 5.4 x 10² N1. A pile driver weighing 200 pounds strikes the top of the pile after being fallen from a height of 20 feet. It forces a pile into the ground a distance of ½ foot. What is the average force of the blow?
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- 4. Object A, whose center is at (2.0m, 2.0m) has a mass of 40 kg. Object B has its center at (10m, 4.0m) and has a mass of 30 kg. What is the x component of their center of mass in m? a) 2.9 6. b) 5.4 B c) 6.1 4. d) 6.3 A e) 6.7 2 8. 10 12 x (m) 6. 2) (w)m)38) Help me to solve this question, no handwritten, only typingAs the amount the object’s of mass increases, what happens to the amount of force needed to begin moving the object? Explain.
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