Answer:
student A
Explanation:
It's going the same value
No, we cannot touch gravity nor can we physically see it. We can only see how it works.
I think this one's B. energy and work are both measured in joules.
Answer:
The change of the volume of the device during this cooling is 
Explanation:
Given that,
Mass of oxygen = 10 g
Pressure = 20 kPa
Initial temperature = 110°C
Final temperature = 0°C
We need to calculate the change of the volume of the device during this cooling
Using formula of change volume


Put the value into the formula



Hence, The change of the volume of the device during this cooling is 
Explanation:
The position vector r:

The velocity vector v:

The acceleration vector a:


