Here are the answers to your questions:
21. If the object starts moving from point A and continues along a straight path from point A to point D, which of the following is true?
- a: In the interval from point B to point C, the object travels 30 m. (This could be true depending on the specific positions of B and C, but there is no absolute information given.)
- b: In the interval from point C to point D, the object travels 0 m. (This could also be likely true but depends on if points C and D are actually the same point.)
- c: In the interval from point A to point B, the object travels 30 m. (Again, this could be true depending on the distances.)
- d: In the interval from point A to point D, the object travels 11 m. (Similar reasoning applies.)
Without specific distance details provided for points A, B, C, and D, it is not possible to definitively answer. More information or a diagram would be required to determine the correct option.
22. Which of Newton's Laws does the following scenario describe?
- a 3rd Law (This scenario describes Newton's 3rd Law of motion, which states that for every action, there is an equal and opposite reaction.)
24. An object that is accelerating may be (choose all that apply)
- a not moving. (True; an object can accelerate from a state of rest.)
- b slowing down. (True; this is also known as negative acceleration.)
- c gaining speed. (True; this is positive acceleration.)
- d traveling at a constant speed. (False; if an object is moving at a constant speed, it is not accelerating.)
- e changing direction. (True; changing direction at a constant speed is still considered acceleration.)
25. Which terms correctly represent a vector quantity and its respective unit?
- a speed - meters per second (False; speed is a scalar quantity.)
- b mass - kilogram (False; mass is also a scalar quantity.)
- c weight - kilogram (False; weight is a vector quantity measured in Newtons.)
- d force - Newton (True; force is a vector quantity measured in Newtons.)
26. Which terms correctly represent a vector quantity and its respective unit?
This duplicates question 25 and has the same answer.
- a speed - meters per second (False; speed is scalar.)
- b mass - kilogram (False; mass is scalar.)
- c weight - kilogram (False; weight is a vector, units in Newtons.)
- d force - Newton (True; force is vector, units in Newtons.)
27. If you keep a gas's temperature constant, how would you increase the volume of the gas?
- a You would decrease the temperature (False; this does not apply since temperature is constant.)
- b You would increase the pressure (False; increasing pressure would decrease the volume, according to Boyle's Law.)
- c You would change the temperature (False; temperature is constant in this scenario.)
- d You would decrease the pressure (True; according to Boyle's Law, if you decrease the pressure while keeping the temperature constant, the volume will increase.)