consider the point charges shown below, where q1= - 6.00 ×10-9 c, and q2= +2.00 ×10-9 c.
i) find the force exerted by q1 on q2. (5 points)
ii) what is the direction of the above force in part (i)? (5 points) iii) how much is the force exerted by q2 on q1? (5 points)
iv) what is the direction of the above force? (5 points)

An insulated thermos contains 148 g of water at 72.7 ˚c. you put in a 11.7 g ice cube at 0.00 ˚c to form a system of ice + original water. the specific heat of liquid water is 4190 j/kg•k; and the heat of fusion of water is 333 kj/kg. what is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?