Question

For Q.10 i got 15.24 N which is not correct. Please show steps thanks.

8) The diagram above shows a 2 kg cart that is set on top of a table. It is able to roll with very little friction. The cart is attached to a 7 kg weight by a light thread that frictionlessly slides over a pulley. How much horizontal force must you apply to the cart in order to keep the system from beginning to move? Correct, computer gets: 68.60 N Hint: Try to calculate the force on the cart due to the tension created by the weight. How much force must you apply in the opposite direction to cancel this out? 9) Suppose you reduce the amount of force you are applying by half. What is the acceleration magnitude for the cart and the weight? Correct, computer gets: 3.81 m/s 2 10) How much tension is in the thread as the system accelerates? Submit All Answers Last Answer: 26.7 N nswer: Incorrect, tries 10/20 11) Suppose that the cart's wheels could be locked so it would not roll, but instead slide along the table top. What minimum value must the coefficient of static friction be in order for the system to balance as in the first problem in this series? Answer: Submit All Answers

Answer 1

Now - F + T = 2 times a (Newton's;aw) T = F + 2a = 68.6 + 2/2 + 2 times 3.81 T = 41.92