Final answer:
True, all doors must be kept closed while a pupil transport vehicle is in motion. The questions cover physics concepts such as uniform motion, Doppler effect, solar sails, Kepler's laws, and the necessity of an external force to move an object in space.
Step-by-step explanation:
All doors shall be kept closed while the pupil transport vehicle is in motion: The statement is true. This is a basic safety regulation that helps to prevent accidents and ensure that passengers are safe while the vehicle is moving.
The subjects of these questions primarily deal with laws of physics or physical principles related to motion, forces, sound frequency, and more. They are typically covered in high school physics curricula and can sometimes appear in more advanced settings, depending on the complexity of the concepts being explored.
- For a car moving at a constant speed in a straight line, the motion is uniform, and a position vs time graph would be a straight line with a constant slope, indicating motion at a constant velocity.
- The observed frequency of sound does not become infinite when the source moves at the speed of sound; instead, it experiences a large increase due to the Doppler effect, but never infinite.
- A solar sail craft can indeed be propelled by the particles in the solar wind, illustrating the transfer of momentum from light and particles to the sail.
- Kepler's laws of planetary motion assume that a planet-satellite system is isolated; however, these laws can be approximately applied even when external influences are relatively weak.
- The concept of external force in space relates to Newton's first law of motion, which implies that an object at rest will stay at rest unless acted upon by an external force, even in space where there is no atmospheric friction or significant gravitational influence.