In a movie, the heroine saves the day by cutting a wire before the time runs out on a timer. how did she change the circuit? a) she changed a short circuit to an open circuit. b) she changed an open circuit to a closed circuit. c) she changed a closed circuit to an open circuit. d) she changed a closed circuit to a short circuit

C) She changed a closed circuit to an open circuit.

Option (c)

Explanation:

When the current flows through the circuit, then it is called closed circuit.

When the current does not flow through the conductor, then it is called open circuit.

So, she changed the closed circuit to an open circuit.

In open circuit, no current flows through the circuit.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

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im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.