Answer:
Increasing the length of the pendulum quantitatively increases the time period of oscillation.
Explanation:
Given data,
A grandfather's clock keeps time by making 60 swings in 60 seconds.
After two hours the clock is slow by 1.5 minutes.
The time period of oscillation is given by the formula,
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Where 'l' is the length of the pendulum clock.
Increasing the length of the pendulum quantitatively increases the time period of oscillation.
Answer:
The total work done by the person is given as = m g h
= 4.5kg x 9.8m/s²x1.2m
= 52.92J
This is the work done in moving the block in a vertical distance
However there is no work done when the block is moved in a horizontal direction since ko work is done against gravity.
Explanation:
Visible light waves are the type of electromagnetic waves that make up the colors of the rainbow, because the rainbow is visible to us.
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.