1. (6p) If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work (in ft-lb) is needed to stretch it 18 in. beyond its natural length? Give your answer in decimal form.
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- 1. To compress spring 1 by 0.20m takes 150 J of work. Stretching spring 2 by 0.30m requires 210J of work. Which spring is stiffer? Explain and draws.1) How much work must one do to pull the block up 13 meters? The mass is 44 kg.7. A force of 50 lb is required to hold a spring that has been stretched from its natural length of 2 ft to a length of 5 ft. How much work is done in stretching the spring from 5 ft to 8 ft?
- A different car accelerated from 0.12 m/s to 0.52 m/s. The acceleration of the car was 0.040 m/s². The work done to accelerate the car was 0.48 J. Calculate the resultant force needed to accelerate the car.4. A car crashes into a tree. What is the work done by the tree stopping the car? The car has a mass of 2075 kg and was traveling at 20.45 m/s. Include a negative if appropriate. Previous submissions:2) What is the work done by the force of gravity Fg ? A. F dcos(0) B. F dcos(90) C. F dcos(180") D. F dcos(270) F. 3)
- 2. Nicole lifts a bowling ball with a mass of 6.2 kg to a height of 1.5 meters above the floor. (a) How much work does she do to lift it? [be careful! E-S-AJ (b) How much gravitational potential energy (GPE) does the ball now have relative to the floor? (E-S-AJ (c) Work put into lifting an object to a given height is (greater than, less than, equal to) the GPE of the object as it rests at that height. (d) How much kinetic energy (KE) does the ball have as she holds it at rest at this height? while increasing in (height. (e) If she drops the ball, the ball will decrease in (height, speed) This indicates a transference of (KE, GPE) to (KE, GPE) speed)A 62 kg man climbs the CN tower which is 0.55 km high in 30 min. How powerful is the man? a) 1.9 X 10¹ W b) 1.9 X 10² W c) 1.1 X 10⁴ W d) 1.9 X 10⁻¹ W