Answer:
210,600πft-lb
Explanation:
Force is a function F(x) of position x then in moving from
x = a to x= b
Work done =
Consider a water tank conical in shape
we will make small horizontal section of the water at depth h and thickness dh and also assume radius at depth h is w
we will have ,
weight of slice under construction
weight = volume × density × gravitational constant
Now we can find work done
=
= 210,600πft-lb
The second law states that the total entropy can never decrese over time for an isolated system
Answer: The mass released from the top of the 60º incline.
Explanation:
The external forces acting upon any of the masses, are the same for both (not numerically): the gravity, the normal force and the friction force.
As the gravity is always directed downward, we can decompose it in a component normal to the surface (that is equal to the normal force as the body is not accelerating in this direction), and another which is parallel to the incline, and which is the responsible for the acceleration of the object along the incline (opposed by the friction force).
So, we can write the following:
Fx = mg sin θ - μk .Fn = m.g. sin θ - μk. mg cos θ= m a
We can easily see, that if the angle is larger, the acceleration component due to gravity will be larger, and at the same time, the friction force will be smaller, so the acceleration for the 60º will be the larger one.
The answer is true, is called Thermal pollotion:).
A) <u>Weight = mass × acceleration (due to gravity) </u>
= 60×9.8
= 588 N
<u>B) Potential energy = mass x gravity x change in height
</u>
1,000 = 60.0 x 9.8 x h
h = 1.7 m
<u>C) Kinetic energyF = potential energyI
</u>
KEF = 1/2mv2
PEI = mgh = 1,000 J
1/2mv2 = 1,000
1/2(60.0)v2 = 1,000
v2 = 33.33
v = 5.77 m/s