H = mc∆T
where, H=heat energy
c = SHC
H = 2*921*(40-20)
H = 36840J
H = 36.84KJ
The energy transferred to it is 36.84KJ
Hi there!

To calculate the tension, we must calculate the acceleration of the system.
Begin with a summation of forces:
∑F = -M₁gsinФ + T - T + M₂g
Simplify and solve for acceleration: (Tensions cancel out)

Plug in values. Let g = 10 m/s²

Now, to find tension, let's sum up the forces acting on ONE block. For simplicity, we can look at the hanging block:
∑F = -T + W
ma = -T + W
Rearrange to solve for T:
T = W - ma
We know the acceleration, so plug in the values:
T = (8)(10) - (8)(5.91) = 32.73 N
<u>Answer</u>
1.667 m/s²
Using the Newton's second law of motion;
force is directly proportional to the rate of change of momentum and it takes place in the direction of force.
i.e F = change in momentum
F = (mv - mu)/t
=m(v-u)/t
= ma
∴ F =ma
a = F/m
= 150/90
= 1.667 m/s²