The normal boiling point of a certain liquid is , but when of urea () are dissolved in of the solution boils at instead. use this information to calculate the molal boiling point elevation constant of . be sure your answer is rounded to the correct number of significiant digits.

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