A block and tackle or only tackle is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads.
This is a good question. The short (but less satisfying) answer is: "because the hydrostatic pressure of oil at a certain depth depends on the height of the oil level, measured from that point." So, you can have a tiny amount of oil but arranged in a column that makes it very tall/high and get high pressure, and have same amount of oil spread so that the height is negligible to produce a negligible amount of pressure. The exact formula for pressure is P=r*h*g (r stands for the liquid density, h for height, and g for gravitational acceleration).
The long answer, but much more satisfying, goes through the derivation of this formula. I recommend searching for a good video explaining hydrostatic pressure. (I can't post links).
Answer:
Part a)
U = 15.5 J
Part b)
h = 1.05 m
Part c)
v = 4.55 m/s
Explanation:
Part a)
Initial potential energy stored in the spring is given by
now we have
x = 20.0 cm
now from above formula we will have
Part b)
By mechanical energy conservation law we can say that initial spring potential energy stored = final gravitational potential energy at the top position
So maximum height from gun is 1.05 m
Part c)
For muzzle velocity of the ball we can use the energy conservation again
According to which the final kinetic energy of the ball = initial spring energy stored in it
<span>The answer is B, because a heterogeneous mixture consists of elements that have the same appearance and composition, If sand, salt, and iron filings are combined, they would look like one uniform element rather than three separate elements.</span>
