According to the ideal gas law, increasing the volume of a closed reaction container decreases the thermal energy because the
2 answers:
Answer:
D is the answer
Explanation:
According to the ideal gas equation:
The nR are constant because you are not letting molecules of the gas scapes or enter the container even if you double the size, so in order to keep the right side constant as the Volume increases, the pressure must decrease (this is thinking that temperature is the same through all the process), and with more space to move, the collision between particles decreases too.
The thermal energy is linked to the collision between particles, if the number of collisions decreases, then the thermal energy decreases because the total kinetic energy is less now, so in general the energy in the system is less.
Where did all that energy go? it has been lost at the moment of the expansion of the volume, a work has been done to the surroundings
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(a) Find free-body diagram in attachment (please rotate the picture, such that R points upward and mg points downward)
There are only two forces acting on the parachutist:
- Its weight, downward, of magnitude 1000 N, labelled with "mg" in the diagram (where m = mass of the parachutist, g = acceleration of gravity)
- The air resistance, upward, of magnitude 2000 N, labelled with "R" in the diagram
As the air resistance is larger than the weight, in the diagram it is represented with a longer arrow, in order to show the difference in magnitude.
(b) 1000 N, upward
By taking upward as positive direction, we can rewrite the two forces as:
R = +2000 N
mg = -1000 N
Where we have written the weight as a negative number, since its direction is downward.
Therefore, the net force on the parachutist will be
F = R + mg = +2000 + (-1000) = +1000 N
And the positive sign indicates that the resultant force is upward.
(c) The parachutist will be accelerated upward (= he/she will slow down)
We can answer this part by applying Newton's second law, which is summarized by the following:
(1)
where
F is the resultant force on the body
m is its mass
a is its acceleration
For the parachutist in this problem, the mass is
Therefore, using (1), we find the acceleration of the parachutist:
Where the positive sign indicates that the acceleration is upward. Therefore, the parachutist will be accelerated upward, which means that he/she will slow down, since its direction of motion was downward.
