Can someone show me their work to find the answers to these problems? it's for my homework, but this screenshot shows the answers because it's a practice problem. i tried doing the practice problem with the answers to find out if i'm doing it the right way, but i can't get to the answers it's showing.

a) tension in rope = weight of B = 27N

to prevent A from sliding, friction must be >= tensions in rope = 27N

friction = weight * coeff of frict.

= (weight of A+C) * 0.2

combining

27 = (46+ min wt. of C)*0.2

min wt. of C = 135 - 46

= 89N

b) if C is removed, friction force = 46*0.15 = 6.9N

let acceleration for A and B be x, rope tension be T n gravity be g=9.8

look at free body diag for A:

tension - friction = mass A * accel

T - 6.9 = (46/g)*x

T =  (46/g)*x + 6.9

look at free body diag for B:

wt of B - tension = mass B * accel

27 - T = (27/g)*x

combining

27 - ( (46/g)*x + 6.9) = (27/g)*x

20.1 = ((27+46)/g)*x

x = 20.1*g/73

= 20.1*9.8/73

= 2.698

= 2.7 m/s^2

15.3 cos 65 degrees trig

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."