(b) Find the velocity of mi after 1,80 s 8.5 m/s Enter a number. |upward 1.8/9 p
ID: 1584728 • Letter: #
Question
(b) Find the velocity of mi after 1,80 s 8.5 m/s Enter a number. |upward 1.8/9 points l Answers A block weighing 70.0 N rests on a plane inclined at 25.0° to the horizontal. A force F is applied to the object at 50.0° to the horizontal, pushing it upward on the plane. The coefficients of static and kinetic friction between the block and the plane are respectively, 0.386 and 0.156 (a) What is the minimum value of F that will prevent the block from slipping down the plane? Enter a number. (b) What is the minimum value of F that will start the block moving up the plane? Enter a number. (c) What value of F will move the block up the plane with constant velocity? Submit A 2.00 kg block starts from rest at the top of a 30° incline and slides a distance of 1.90 m down the incline in 1.40 s. (a) Find the magnitude of the acceleration of the block. 1.9 m/s 2 (b) What is the coefficient of kinetic friction between block and plane? on the block?Explanation / Answer
Normal force = Wcos25 - Fsin25
a)
Fcos25 + us*(Wcos25 - Fsin25) = Wsin25
F*cos25 + 0.386*(70*cos25 - Fsin25) = 70sin25
F = 6.86 N
b)
Fcos25= Wsin25 +us*(Wcos25 - Fsin25)
F*cos25 = 70*sin25 + 0.386*(70*cos25 - F*sin25)
F = 50.56 N
c)
Fcos25= Wsin25 +uk*(Wcos25 - Fsin25)
F*cos25 = 70*sin25 + 0.156*(70*cos25 - F*sin25)
F = 40.61 N
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