A house is advertised as having 1560 square feet under roof. What is the area of this house in square meters?
1 answer:
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Answer:
<h2>The work done is 0.882 Joules.</h2>Explanation:
To calculate the work, we need to find all forces that are involved in the movement.
As you can analyse, the body is the force that make the box to move, and the friction force is opposite to it, we cannot forget about the friction. So, we have to calculate the resultant force to this context.
So, to find we use:
; where
The friction force would be:
Then, the resultant force is:
Now, we calculate the work:
Therefore, the work done is 0.882 Joules.
Answer:
Explanation:
Let the mass of bullet is m, initial velocity of bullet is vi and c be the specific heat of the bullet.
Kinetic energy, K = 1/2 mvi^2
According to the question, 50% of the kinetic energy is equal to the heat energy absorbed by the bullet.
50% of K = mass of bullet x specific heat x rise in temperature
1/4 mvi^2 = m x c x ΔT