Physical changes are those which do not affect the chemical properties of a substance. For example, when a paper is cut, the two pieces obtained are still paper. The chemical properties have not changed. Only, physically when one piece is cut to two. A chemical change occurs when the chemical properties change and a new substance with different chemical properties is obtained. For example, when the paper is burnt, it turns to ashes. Hence, this is a chemical change.
When a substance undergoes a physical change, the physical properties of the substance changes like the state (solid to liquid during melting), shape, size, volume etc. Many physical changes are reversible whereas, in general many chemical changes are irreversible.
Answer:
9.069 KW
Explanation:
The heat engine operates in a carnot cycle between 75°C to 492°C so the lower temperature and the higher temperature
Efficiency of the carnot cycle
We know that
it is given that duration of each cycle is 1.16 sec so power output
In the presence of air resistance, a watermelon is launched into the air with 100 j of kinetic energy.
Its kinetic energy is less than 100 J when it reaches its starting point. Its kinetic energy decreases as it encounters air resistance and returns to its starting point. In actuality, some of the energy has been lost because of air resistance. Since we use the ball's original height as a point of reference, there is no potential energy when the ball is in its initial state of motion, and K is its kinetic energy. This total energy is conserved if there is no air resistance, therefore when the ball returns to its starting position, its kinetic energy will remain at 100.
Learn more kinetic energy about here:
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When a force of 8 N applied to a mass of 1 kg will cause it then mass will accelerate at the rate of
<u>Explanation</u>:
Given:
Force=8N
Mass=1kg
To find:
Acceleration rate=?
Solution:
Accrding to Netwon's second law of motion
Force = Mass x Acceleration
On substituting the values,
Solving the equation for Acceleration
Acceleration =8
Very slightly less than 1 g/cm^3 averaged over the entire body.
Even though it doesn't feel like it when you're in the pool, if you completely relax and let go, you do float in water.