Answer:
Joule is the name of the unit that are normally used to measure energy
Explanation:
Answer:
When u go on a rock climbing, earth exerts gravitational force on pack in downward direction (pointing towards the center of earth).
In order to climb, you need to work against work done by gravity on the pack. Hence work done by you = work done by gravity on pack
= Force x displacement = 70 x 30 = 2100 J.
So you need to do 2100 joules of work to lift your pack.
Power is the rate of work done. Therefore power = work done by you/ time in seconds
=2100/600 =3.5 watts
hence the answers is 3.5 watts.
Answer: Option (a) is the correct answer.
Explanation:
Entropy is defined as the degree of randomness present in a substance. This means that more randomly the atoms in a substance are moving more will be entropy of the substance.
Entropy of a substance increases with increase in temperature.
For example, when a piece of wood is burned then its molecules will gain kinetic energy and hence, they start to move randomly from one place to another.
As a result, there will occur an increase in its entropy.
Thus, we can conclude that when a piece of wood is burned then its entropy increases.
Answer:
The correct answer will be "0.25 sec".
Explanation:
The graph of the given question is attached below.
According to the graph of the question,
Time,
T = 1 sec
For the upward velocity,
⇒
By putting the value, we get
⇒
⇒
There is a correlation between a main sequence star's mass and its luminosity.