Question

Two masses, m1 = 25.0 kg and m2 = 45.0 kg, are attached by a massless rope over a massless pulley as shown above. The angle of the frictionless incline is 27.0 degrees . Assume that m2 starts at rest and falls a vertical distance of 3.00 m. Assume m1 also starts at rest and the rope remains taut.

a) Determine how much work is done by gravity on m2 as it falls.
b) Determine how much work is done by gravity on m1 as it moves up the incline.
c) Determine how much work is done by the normal force on m1 as it moves up the
incline.
d) Determine the total kinetic energy of the two-mass system after m2 has fallen a
vertical distance of 3.00 m.
e) Determine how much work the tension in the rope does on m1 as it moves up the
incline.

Answer 1

For E use this equation KE= .05 x m1 x v^2

Answer 2

For D use this equation W=F*S, W being work, F being Force, and S being the direction

Answer 3

hi can you be more precise as to which numbers I am supposed to use before plugging it in?

Answer 4

Okayy so switch them use the first equation for E and the second one for D.. What's your velocity i the problem?

Answer 5

what I don't understand is how to get the acceleration for the net force. Do I use m2g-m1g(sin27)?

Answer 6

Yes

Answer 7

and I'll have to calculate the final velocity by using the kinematics equation?

Answer 8

Yes

Answer 9

ok thanks!