Nylon is a “big” covalent molecule used to make backpacks. which property of covalent compounds is most useful in making backpacks? a: soft. b: brittle. c: low melting point. d: nonconductor of electricity

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