please help question 13, 14, 15, 17, 18, 19. Thank you in advance! 13) You are p
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please help question 13, 14, 15, 17, 18, 19. Thank you in advance!
13) You are planning on hanging the famous Wookie Lisa in a turbolift. The cables you have available can each support 150 N of tension. The painting's mass is 40 kg. In the event of an emergency, the turbolift is designed to brake at a rate of 4g, where g corresponds to Earth gravity. In order to avoid damage to the painting, you want to use enough cables so that no one cable exerts a force greater than 120 N on the painting. On the other hand, Chancellor Palpatine himself, citing the clone army budget, has demanded that you use the minimum number of cables. How many cables do you use? Answer: Submit All Answers Last Answer: 4 Not yet correct, tries 1/25 Hint: How is the amount of force exerted by a cable on the painting related to the amount of force the painting exerts on the cable? Consider the case of an emergency brake and how this affects the apparent weight (not the actual weight) of the painting. Use free body diagrams to help work out the relationship between the forces exerted by the cables, the weight of the painting, and the acceleration of the lift during an emergency stop 14) Three identical 5 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 static friction between the surfaces of the crates max out at 24 N. What is the maximum acceleration you can achieve before the upper crates start to slide? Answer: Submit All Answers Last Answer: 4.8 m/s12 Incorrect, triea 2/25 15) What's the maximum amount of force you can apply to the lower crate? Answer: Submit AlI Answers 16) Two different springs are linked together. One spring is attached to the wall and has a stiffness of 6 N/cm. The other spring has a stiffness of I0 N/cm. You pull on the free end of the stiffer spring with a force of 80 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.] Correct, computer geta: 13.33 , 8.00 cn 17) A 330 gram box of cookies is initially at rest on a table top. A thin thread connects to a very light, frictionless pulley. Hanging down from the other end of the thread is a 980 gram weight. What is the minimum coefficient of static friction between the cookie box and the table? Answer: 18) You give the box a small tap and it starts to slide, accelerating at a rate of about 14.66 cm/s.What is the coefficient of kinetic friction between the cookie box and the table? Answer: Submit All Answers Submit AlI Answers 19) How much tension is in the thread while the cookie box is sliding on the table?Explanation / Answer
13)
tension, T=150 N
limit point of each cable is, T=120 N
mass, m=40 kg
a=4*g
the force on the panting, F=ma+w
F=m*4*g+m*g
F=5*m*g
===>
no of cable required, N=F/T
N=5*m*g/T
N=5*40*9.8/(120)
N=16.33 or 16
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