At 20 °C a copper wire has a resistance of 4x10-3 and a temperature coefficient of resistivity of 3.9x10-3 (Co)-1, its resistance at 100 °C is​

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