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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There are missing data in the text of the problem (found them on internet):
- speed of the car at the top of the hill:
- radius of the hill:
Solution:
(a) The car is moving by circular motion. There are two forces acting on the car: the weight of the car
(downwards) and the normal force N exerted by the road (upwards). The resultant of these two forces is equal to the centripetal force, 
, so we can write:
(1)
By rearranging the equation and substituting the numbers, we find N:
(b) The problem is exactly identical to step (a), but this time we have to use the mass of the driver instead of the mass of the car. Therefore, we find:
(c) To find the car speed at which the normal force is zero, we can just require N=0 in eq.(1). and the equation becomes:
from which we find
- speed of the car at the top of the hill:
- radius of the hill:
Solution:
(a) The car is moving by circular motion. There are two forces acting on the car: the weight of the car
By rearranging the equation and substituting the numbers, we find N:
(b) The problem is exactly identical to step (a), but this time we have to use the mass of the driver instead of the mass of the car. Therefore, we find:
(c) To find the car speed at which the normal force is zero, we can just require N=0 in eq.(1). and the equation becomes:
from which we find