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A spanner with a long handle

Explanation: The use of a spanner for opening the nut of a simple machine will employ the principle of moment.

The force apply to the nut is considered as load while the force applied to the spanner is considered to be effort.

Before the nut can be opened, the effort must overcome the load.

Since moment is the product of a force and the perpendicular distance, the spanner with a long handle will produce a higher moment.

Therefore, a spanner with a long handle will be preferred.

c

explanation:

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer