A 1000-kg mass on a horizontal friction-free table is accelerated by a string attached to another 1200-kg mass hanging vertically from a pulley. The friction force is equal to half the weight of the mass lying on the table. What is the acceleration of the system of both masses?

Please, show your work.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

When measuring volume, why is it important to use the correct tools and units to attain the greatest accuracy? use specific examples from the lab to support your answer. (5 points)

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)