Answer:
Explanation:
Since there is no external Force or Torque on the system of bullet and rod
So we can say that total angular momentum of the system will remain conserved about its center
So we will have
here we know that
now we have
Answer:
v = 1.4 m / s
Explanation:
To solve this problem we use the law of conservation of momentum, for this we define a system formed by the two blocks in such a way that the force during the collision have been internal
initial instant. Just before the crash
p₀ = M v₁ - m v₂
final instant. Right after the crash
p_f = (M + m) v
the moment is preserved
p₀ = p_f
M v₁ - m v₂ = (M + m) v
v = (M v₁ - mv₂)
let's calculate
v = (4 2 - 1 1)
v = 1.4 m / s
in the same direction as the largest block (M)
Answer:
The answer to your question is Friction
Explanation:
As is mentioned in the question, Betsy held on to the sides of the slide the whole way down, that means that her hands were rubbing the slide and this process causes a force called <u>friction. </u>And Friction is perceived as heat.
The definition of friction is: Friction is the resistance to motion of one object moving relative to another.
In your question her hands create a resistance to motion.
A) 350 J
- The initial internal energy of the cup is
- The final internal energy of the cup is
According to the first law of thermodynamics:
where
Q is the heat absorbed by the system
W is the work done on the system
The work done on the system in this case is 0, so we can rewrite the equation as
And so we find the heat transferred
B) IN the cup
Explanation:
in this situation, we see that the internal energy of the cup increases. The internal energy of an object/substance is proportional to its temperature, so it is a measure of the average kinetic energy of the molecules of the object/substance. Therefore, in this case, the temperature (and the energy of the molecules of the substance) has increased: this means that heat has been transferred INTO the system from the environment (the heat came from the sun).