On page 39 it explains that conducting materials. If some part of the external circuit is composed of an insulating material— for example, if there’s an air gap in the circuit—it’s an open circuit. An electric current will flow through a circuit only if the circuit is closed. A common method of controlling the flow of current through a circuit is to include a device called a switch. Current will flow through the circuit when the switch is closed and will stop flowing when the switch is open.
So your answer is A. The switch within the closed circuit is opened
Explanation: The applied force is 20 N, the distance covered is 12.0 m and the angle is 25° above the horizontal.
Hence the formulae that defines work done is given by
W = Force × distance
But since the force has been inclined at an angle θ above the horizontal, the horizontal component of force is neccesary to produce the required motion to make the child do work on the wagon.
Hence
Work done = (horizontal component of force) × distance
While the question should have given the person who did the sowing for example the seeds were sown by him/ her/ the farmer/ or any name. Therefore, voice is given in passive and to change passive voice to active voice then the sentence will read as follows assuming that the seeds were sown by him
