Final answer:
The statement about not needing to use the parking brake is false; always use the parking brake when away from your vehicle to ensure safety. Valid physics principles support the other provided true/false statements about external forces, accelerated motion, and induced electric currents.
Step-by-step explanation:
The statement 'you do not need to use the parking brake if you are away from your vehicle for a short time' is false. Using the parking brake, also known as the emergency brake, is an important safety measure. It ensures that the vehicle remains stationary, especially on slopes or uneven surfaces, where the vehicle might otherwise roll.
Regarding the physics questions provided:
- 46. An external force is required to set a stationary object in motion in outer space away from all gravitational influences and atmospheric friction. The answer is a. True.
- 18. The position vs time graph of an object that is speeding up is not a straight line but rather a curve that becomes steeper over time. So the answer is b. False.
- 34. If you drop a bar magnet through a copper tube, it induces an electric current in the tube due to the changing magnetic field, which is consistent with Faraday's Law of Electromagnetic Induction. Thus, the answer is b. True.