In Figure 4.27 four particles form a square of edge length a=5cm and have charges q1=+10nc, q2=-20nc, q3 = +20nc, q4=-10.0nc. In unit-rector notation, what net
electric field do the particles produce at the centre of square?

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m

What is the stall speed at sea level of an airplane that weights 10000 lbs., has a wing area of 300ft^2, and a maximum lift coefficient of 1.4? what is the stall speed if flaps that double cl,max are applied?

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