Answer:
The magnitude of the acceleration of the box is 
.
Explanation:
The free body diagram of the crate is included as attachment, whose equations of equilibrium are described below:
From second equation of equilibrium we find an expression for the normal force and find the respective value:
Lastly, the acceleration experimented by the crate during pushing is cleared in the first equation of equilibrium and consequently calculated:
The magnitude of the acceleration of the box is .
begin with vibrations of the eardrum. Sound waves cause the eardrum to vibrate. Cells in the cochlea detect the vibrations and send a message to the brain.
Answer:
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B. Switch</h2>
Explanation:
<u>A device designed to open or close a circuit under controlled conditions is called a switch. The terms “open” and “closed” refer to switches as well as entire circuits. An open switch is one without continuity: current cannot flow through it.</u>
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