968 j or kg because it cannot lose any of it energy and cannot gain any extra mass from nothing
Answer:
Types of Mechanical Energy
There are two types of energy: potential and kinetic.
Potential energy is energy that is stored in an object due to its position. This type of energy is not in use but is available to do work. For example, the book possesses potential energy when it is stationary on the top of the bookshelf.
Ep=m*g*h (m - mass, g - gravitaional acceleration (Earth mean value g=9, 81 m/(s2), h - height from the zero or referent level) s2=s*s
Kinetic energy is energy that is possessed by an object due to its motion. For example, if the book were to fall off the shelf, it would possess kinetic energy as it fell. All energy is either potential or kinetic.
Ek=(m*v2)/2 v2=v*v
The law of the conservation of energy states that energy is neither created nor destroyed. Instead, it is simply transferred from one type of energy to another, or from one form of energy to another. The difference between mechanical energy and kinetic energy is that kinetic energy is a type of energy, while mechanical energy is a form of energy.
Answer:
-13,594 J
Explanation:
First of all, we have to find the acceleration of the girl+sled system. This can be found by using Newton's second law of motion:
where:
F = -96 N is the net force (the force of friction) acting on the system
m = 28.4+15.3 = 43.7 kg is the total mass of the girl and the sled
a is their acceleration
Solving for a,
The negative sign means the sled is slowing down.
Now we can find the displacement of the sled during the deceleration phase, by using the suvat equation:
where
u = 41.8 m/s is the initial velocity
t = 3.76 s is the time
is the acceleration
So,
Now we can find the work done by friction on the sled, which is given by:
where
F = -96 N is the force of friction
s = 141.6 m is the displacement of the sled+girl system
Solving,
where the negative sign means the force is opposite to the displacement.
The answer to this question is A. As the gas gets hotter, the molecules gain energy and move farther apart, causing the gas to expand. This is because, whenever you heat a substance, (solid, liquid, or gas), the molecules in the substance will always move more rapidly causing the substance to expand and the molecules to move further away from one another.
