Why are non-Newtonian fluids called non-Newtonian when they follow Newton’s third law? To my understanding, Newton’s third law states that for every action there is an equal and opposite reaction. Therefor if I punch the non-Newtonian fluid harder, there will be a harder reaction force stopping my hand. So why is the fluid called non-Newtonian?

A boat is pulled into a dock by means of a winch 12 feet above the deck of the boat. 
(a) The winch pulls in rope at a rate of 4 feet per second. Determine the speed of the boat when there is 13 feet of rope out. What happens to the speed of the boat as it gets closer to the dock? 
(b) Suppose the boat is moving at a cons tant rate of 4 feet per second. Determine the speed at which the winch pulls in rope when the re is a tota l of 13 feet of rope out. What happens to the speed at which the winc h pulls in rope as the boat gets closer to the dock ?

Four point charges form a square with sides of length d, as shown in the figure. In the questions that follow, use the constant k in place of ${\displaystyle \frac{1}{4\pi {ϵ}_0}}$.

Part A
What is the electric potential ${\displaystyle V_{\to t}}$ at the center of the square?
Make the usual assumption that the potential tends to zero far away from a charge.
Express your answer in terms of q ,d, and appropriate constants.
${\displaystyle V_{\to t}=}$ 
Part B
What is the contribution ${\displaystyle U_{2q}}$ to the electric potential energy of the system, due to interactions involving the charge 2q ?
Express your answer in terms of q, d, and appropriate constants.
${\displaystyle U_{2q}=}$
Part C
What is the total electric potential energy ${\displaystyle U_{\to t}}$ of this system of charges? Express your answer in terms of q, d, and appropriate constants.
${\displaystyle U_{\to t}=}$
, plz i want just the final answers , thanks

A small block is attached to an ideal spring and is moving in SHM on a horizontal, frictionless surface. The amplitude of the motion is 0.240 m and the period is 3.08 s. 
a. What is the acceleration of the block when x = 0.160 m?