This is specific latent heat of fusion.
This is the heat needed to turn 1 kg of solid into a liquid at its melting point. When a substance changes its state from solid to liquid form or from liquid to gas , heat energy is needed. This energy is used not to heat the substance but to separate the molecules from each other.
This energy is called latent heat energy. While a liquid is boiling and while a solid is melting, there is no temperature change. The temperature only changes when the change of state is complete.
Magnetism and gravity.
hope this helps you
Answer:
a.) W/3, b.)2g/3 c.) (4gh/3)^0.5
Explanation:
First we have to find tension in terms of torque. To do that we have to find the moment of inertia of a rigid cylinder. From Wikipedia I get:
We also know the equation for torque. Let T be the tension, r be the distance, I is the moment of inertia and alpha is angular acceleration (ignore theta because it is perpendicular)
We can then substitute a/r for α
Therefore we get:
Isolating T and substitute the moment of inertia in for I we get
There are two known forces acting on the cylinder, gravity and tension. The sum of these two forces gives us mass times acceleration (Newton's second law)
This allows us to plug acceleration back into Newton's Second Law:
w = the weight
For part b, we solved in part a:
For part c, we use the conservation of energy. We know that the sum of energy in the system is zero.
Answer:
21 m/s
Explanation:
There are three forces on the pendulum:
Weight force mg pulling down,
Vertical tension component Tᵧ pulling up,
and horizontal tension component Tₓ pulling towards the center of the curve.
Sum of forces in the y direction:
∑F = ma
Tᵧ − mg = 0
T cos 37° = mg
T = mg / cos 37°
Sum of forces in the centripetal direction:
∑F = ma
Tₓ = mv²/r
T sin 37° = mv²/r
(mg / cos 37°) sin 37° = mv²/r
g tan 37° = v²/r
v = √(gr tan 37°)
v = √(9.8 m/s² × 60 m × tan 37°)
v = 21 m/s
Answer:
Explanation:
It doesn't mean it equal to each other. lets say x is directly proportional to y. Here, if something happens to x then, y will do the same thing. for example, if x increases, then y also increases. similarly, if x decreases, then y also decreases. therefore, x is something or lets say it is a major factor that decides the fate of y.