please do all the questions webassign.net Netflix Netflix PHYS 121 HW 4 24. -/4
ID: 1885042 • Letter: P
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please do all the questions
webassign.net Netflix Netflix PHYS 121 HW 4 24. -/4 points SerCP10 4.P.051 My Notes Ask Your Teacher A 3.00-kg block starts from rest at the top of a 28.5° incline and slides 2.00 m down the incline in 1.35 s. (a) Find the acceleration of the block. (b) Find the coefficient of kinetic friction between the block and the incline (c) Find the frictional force acting on the block. (d) Find the speed of the block after it has slid 2.00 m. Need Help? L Read" 25. -3 points SerCP10 4.P.05 My Notes Ask Your Teacher Objects of masses m1 = 4.00 kg and m 2 9.00 kg are connected by a light string that passes over a friction ess ulley as in the gure belo e object on the floor, and m2 rests on a fixed incline of 42.5. The objects are released from rest and 2 sl des 50 m down the slope of the incline in 5.00 s. shed at est (a) Determine the acceleration of each object. (Enter the magnitude only.) m/s2Explanation / Answer
A)
Distance, s = ut + 0.5 at^2
Acceleration, a = 2S/t ^2 = (2 x 2)/1.35^2 = 2.19 m/s^2
B)
Coefficient, u = tan(theta) - a/g cos(theta)
u = tan28.5 - 2.19/(9.8 x cos28.5) = 0.289
C)
F = umg cos(theta) = 0.289 x 3 x 9.8 x cos28.5 = 7.46 N
D)
Vf^2 = vi^2 + 2ax
Vf^2 = 0 + 2 x 2.19 x 2
Vf = 2.96 m/s
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