Final answer:
The increased height results in increased potential energy, not kinetic, when a rock is thrown. An external force is needed to set an object in motion in space, and high-voltage wires are not insulated. The force to push a box up a ramp is not directly tied to its height, and the graph of speeding up is a curve, not a straight line.
Step-by-step explanation:
The question relates to how energy is transformed when an object is in motion. The statement to be assessed is whether throwing a rock into the air increases the rock's kinetic energy during its rise and if the increase in velocity as it falls to the ground would increase its potential energy.
False. As a rock is thrown into the air, its kinetic energy is actually converted into potential energy. This potential energy reaches a maximum when the rock is at the highest point of its trajectory. Once the rock starts falling, its potential energy is then converted back into kinetic energy. The kinetic energy increases as the velocity of the falling rock increases, while its potential energy decreases accordingly.
Regarding objects in motion in outer space, the statement that an external force is needed to set a stationary object in motion is true. According to Newton's first law of motion, an object at rest will stay at rest, and an object in motion will remain in motion with the same speed and in the same direction unless acted upon by an external force. This is true even in outer space, which is assumed to be devoid of gravitational and atmospheric influences.
The statement about high-voltage wires being wrapped in insulating material is false. High-voltage wires are typically not wrapped in insulation because they are separated by enough air space that serves as the insulator, and the connectors to the towers have insulators to prevent current from traveling down the tower.
For the boy pushing a box up a ramp, the assertion that a 300 N box requires exactly 100 N of force to push it up a 1.0 m high and 3.0 m long ramp is false. The actual force required depends on various factors, including friction and the efficiency of the ramp. The force exerted by the boy is related to the component of gravitational force along the ramp, not directly to the vertical height.
Lastly, the position vs time graph for an object that is speeding up is not a straight line but a curve. Therefore, this statement is false. A straight line would indicate constant speed, but if an object is speeding up, the graph will show a curve that gets steeper over time.