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iPad 11:43 AM 88% E MasteringPhysics: Assi x Mastering Physics: Hw3 x C D session masteringphysics.com/ 39515789&offset; next Physics for Sciences 1 signed in as charley correa Help Close HW3 Problem 3.48 previous I 5 of 7 l next Problem 3.48 You want to use a rope to pull a 12-kg box of books up a plane inclined 30 above the horizontal. The coefficient of kinetic friction is 0.30. The rope pulls parallel to the incline. Part A What force do you need to exert on the rope if you want to pull the box at constant speed. Express your answer to two significant figures and include the appropriate units. 86 N FIE Submit My Answers Give Up Incorrect; Try Again; 5 attempts remaining Part B What force do you need to exert on the rope ifyou want to pull the box with a constant acceleration of 0.50 m/s up the plane? Express your answer to two significant figures and include the appropriate units.Explanation / Answer
constant speed means accelaration a = 0.......
Fnet = m*a = 0......
on the inclined plane fk = mg*sin 30...
force required is F = fk = mg*sin 30......
fk = 12*9.81*0.5 = 58.86 N...
B) Fnet = 58.86+ma...= 58.86+12*0.5 =58.86+ 6 N = 64.86 N
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