What are the respiratory organs?

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.

What is the largest meteoroid that has collided with this planet

You want to move a heavy box with mass 30.0 kg across a carpeted floor. you pull hard on one of the edges of the box at an angle 30∘ above the horizontal with a force of magnitude 240 n, causing the box to move horizontally. the force of friction between the moving box and the floor has magnitude 41.5 n . what is the box's acceleration just after it begins to move