14) Three identical 4 kg crates are stacked one on top of the other. You want to

Question

14) Three identical 4 kg crates are stacked one on top of the other. You want to accelerate them as much as possible by pushing on the lower crate, but the forces of statie friction between the surfaces of the crates max out at 26 N. What is the maximum acceleration you can achieve before the upper crates start to slide? Answer: 15) What's the maximum amount of force you can apply to the lower crate? Answer: Submit All Answers Submit All Answers 16) Two different springs are linked together. One spring is attached to the wall and has a stiffness of 6 Nicm. The other spring has a stiffness of 8 N/cm. You pull on the free end of the stiffer spring with a force of 70 N. How much does each spring stretch? [Enter the stretch of the less stiff spring in the first box and the stretch of the stiffer spring in the second one.] Answer 1 of 2: Answer 2 of 2 Submit All Answers

Explanation / Answer

14) Maximum frictional force Fmax = 26 N

Let a be the acceleration, then Fmax = 4a

a = 26/4 = 6.5 m/s2

15) The maximum force that can be applied to the lower crate is (4+4+4)a = 12a = 78 N

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