Here are the answers to your questions:
21. To determine the truth of the statements regarding the object's movement along the path, we would need additional context about the positions of points A, B, C, and D, as well as the distances between them. However, considering these possibilities:
- a: Likely true if it's stated that the object travels from B to C.
- b: Would be true if the object stops at point D.
- c: Could be true if A to B is 30 m.
- d: Would depend on the total distance from A to D. Without more information, it is impossible to definitively answer, but you can evaluate each statement based on known distances.
Answer: Cannot determine without additional context.
22. The given scenario describes Newton's Third Law, which states that for every action, there is an equal and opposite reaction.
Answer: a (3rd Law)
24. An object that is accelerating can be:
- a (not moving): True (an object can accelerate from rest).
- b (slowing down): True (deceleration is a form of acceleration).
- c (gaining speed): True (acceleration in the direction of motion).
- d (traveling at a constant speed): False (constant speed implies no acceleration).
- e (changing direction): True (changing direction while maintaining speed represents acceleration).
Answer: a, b, c, e
25. The terms that correctly represent a vector quantity and its respective unit:
- Speed is a scalar, not a vector; it has magnitude but no direction.
- Mass is a scalar, not a vector.
- Weight is a vector, but its unit is not correct here since weight is measured in Newtons.
- Force is a vector quantity, and it is correctly represented in Newtons.
The only correct statement in this context is: Answer: d (force - Newton)
26. If the gas's temperature is kept constant (isothermal process), increasing its volume typically requires decreasing the pressure according to Boyle's Law.
Answer: d (You would decrease the pressure)