What does it mean to say that an object is opaque? A. It reflects all visible light.
B. It absorbs all visible light.
C. Light will not transmit through it.
O D. Light will transmit through it.

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