Answer:
D: Water is polar, so it can form attractions to and pull apart molecules of many types of substances.
Explanation:
Water is an excellent solvent simply because its polar water molecules usually form hydrogen bonds with ions and polar molecules, thereby allowing the ionic and polar covalent compounds to easily disperse easily in water.
Thus, the correct option is; D
We study the motion of the ball on the two coordinating needles Ox and Oy, originated on the ground. On Ox the ball has a uniform straight motion with the velocity vx = vo and the equation of motion is x = vo * t, and on the ball Oy has a movement uniformly accelerated with acceleration g and no initial velocity on the axis Oy v_oy = 0 (free fall), so the equation of motion is y = h-gt² / 2.The equation of the trajectory is obtained by eliminating the time from the two equations. We hold t = x / vo => y = h-gx²/2vo².The trajectory is a parabola because y is a second degree function of x. Bila arrives on the ground when y = 0 => t =√(2h/g)=√(2*100/9.8)=√20.4=4.51 s
The ball will fall towards the rock at a distance d = vo * t =10*4.51≈45 m
The correct answer is e
Answer:
10.65°
Explanation:
To calculate the initial Mach Number
Now, to calculate the angle turned by the wall; we have the following expression.
where:
= the angle between the initial flow direction = 40°
K is the ratio of specific heats o fair = 1.4