Internal energy<span> is defined as the </span>energy<span> associated with the random, disordered motion of molecules. It is denoted by U and calculated by the expression:
</span>Δ<span>U = Q - W
We calculate as follows:
</span>ΔU = 68 J - 32 J
ΔU = 36 J
F_P + F_Q = M g
F_P = M g - F_Q
Torque, or moment of force:
∑ M_P = 0
∑ M_P = M g L - F_Q · 3 L
0 = M g L - 3 F_Q L / : L
0 = M g - 3 F_Q
3 F_Q = M g
F_Q = M g /3
Finally:
F_P = M g - M g/3
F_P = 4 M g / 3
Answer:
<h3>
The coefficient of kinetic friction between the puck and the ice is 0.12</h3>
Explanation:
Given :
Initial speed
Displacement m
From the kinematics equation,
Where final velocity, in our example it is zero (), acceleration.
From the formula of friction,
Minus sign represent friction is oppose the motion
Where ( normal reaction force )
( ∵ )
So coefficient of friction,
Therefore, the coefficient of kinetic friction between the puck and the ice is 0.12 .
Ask Barry Allen he’s the faster man alive
0.25 m/s squared
hope this helps x