A, Compression
Compression of a gas always requires work
Answer:
Water vapor has mostly disappeared at colder elevations and its effect on weather turbulence.
Explanation:
The chemical symbol for manganese is Mn.
Answer:
The speed is positive either direction.
Explanation:
- It is given that, a vehicle travels at the same speed from point A to point B then from point B to point A.
- We know that speed is a scalar quantity and velocity is a vector quantity.
- Speed has only magnitude while velocity have both magnitude as well as direction.
- In this case, the vehicle will have positive speed in either direction.
- Hence, the correct option is (D)
