Final answer:
True or false questions in Physics about electric fields, Kepler's laws, motion, and momentum are addressed, including the true nature of electric field lines from a positive charge, satellite motion as per Kepler's laws, and the necessity of an external force to set an object in motion in space.
Step-by-step explanation:
The subject of these questions is Physics, specifically focusing on concepts like electric fields, Kepler's laws, motion, and momentum. Each question presents a true or false statement about these physical concepts. For example, the statement 'The electric-field lines from a positive point charge spread out radially and point outward' is true. This reflects how electric field lines represent the direction that a positive test charge would move if placed within the field, and from a positive charge, these lines indeed radiate outward.
Additionally, Kepler's laws of planetary motion imply that a satellite will increase its speed as it approaches its parent body, due to the conservation of angular momentum, and decrease its speed as it moves away, which makes this statement true. Lastly, an external force is indeed required to set a stationary object in motion in space, even in the absence of gravitational influences and atmospheric friction, upholding Newton's first law of motion. Therefore, this statement is also true.