Answer: D 19.3 J
Explanation:
The heat required to increase the temperature of a substance is given by
where
m is the mass of the substance
is the specific heat capacity of the substance
is the increase in temperature of the substance
In this problem, we have:
Substituting into the equation above, we find
Answer:
90J
The only time work is being done is when he lifts the box off the ground. Therefore, using the work formula, 2 x 45, you get 90J. Hope this helps someone.
absorption and insolation.
A stream of particles