Final answer:
The first statement about the force needed to push an object up a ramp is false, as the force is less than the object's weight. The second statement about displacement being different for two individuals taking different paths is false; displacement will be the same. Lastly, the third statement is false, because the balance on the moon is due to a uniform reduction in weight, not uniform gravity similar to Earth.
Step-by-step explanation:
The subject of the question is Physics, and it is typically addressed at the high school level. The statement in question 45 is false because the force required to push an object up a ramp is less than its weight due to the mechanical advantage provided by the ramp. The force needed depends on the angle of the ramp and the friction, not just the height and length of the ramp.For question 4, the answer is false. Displacement is a vector quantity, meaning it depends on direction as well as magnitude. Since both persons have moved the same distance but in different orders, their final displacement from the starting point will be the same, resulting in a northeastward direction from the starting position.
Regarding question 17, the statement is also false. Even though the book and the 1-kg weight will still balance each other on the moon, it is because their respective weights decrease by the same factor due to the moon's lower gravity. It is not because gravity is uniform in the same way as on Earth's surface, but rather because gravity on the moon is uniformly weaker.