Answer:
Thermal expansion occurs when an object expands and becomes larger due to a change in that specific object's temperature. Temperature is the average kinetic (basically movement) energy of the molecules in a substance. A higher temperature means that the molecules are moving faster on average.
Answer:
Explanation:
pressure due to fluid column = hdg where h is height of column , d is density of fluid , g is acceleration due to gravity .
Total pressure on the diver = atmospheric pressure + pressure due to water
= .70 x 13600 x 10 + 15 x 1050 x 10
= 95200 + 157500
= 252700 Pa
= 2.527 x 10⁵ Pa .
Answer:
b) True. the force of air drag on him is equal to his weight.
Explanation:
Let us propose the solution of the problem in order to analyze the given statements.
The problem must be solved with Newton's second law.
When he jumps off the plane
fr - w = ma
Where the friction force has some form of type.
fr = G v + H v²
Let's replace
(G v + H v²) - mg = m dv / dt
We can see that the friction force increases as the speed increases
At the equilibrium point
fr - w = 0
fr = mg
(G v + H v2) = mg
For low speeds the quadratic depended is not important, so we can reduce the equation to
G v = mg
v = mg / G
This is the terminal speed.
Now let's analyze the claims
a) False is g between the friction force constant
b) True.
c) False. It is equal to the weight
d) False. In the terminal speed the acceleration is zero
e) False. The friction force is equal to the weight
Answer:
The speed of the rain is
Explanation:
From the question we are told that
The initial speed and direction of the car is
The angle made with the horizontal is
The velocity of rain is
An illustrate of this question is shown on the first uploaded image
From the diagram we see that
=>
substituting values
Isn't a hypothesis making a theory? Based on that I guess the answer would be A. Making a theory, because you making the hypothesis is not part of testing it.