1.Short-answer questions.
a. Define energy.
b. What is the natural source of light for the earth?
c. What is work ?
d. Give two examples of work where less energy is required.
e.Why is it important to use energy resources with care?
f. From where do we get energy to do work?
Answers
Answer:
a)in physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed.
b)Natural sources of light include the sun, stars, fire, and electricity in storms. There are even some animals and plants that can create their own light, such as fireflies, jellyfish, and mushrooms. This is called bioluminescence.
c)In physics, work is the energy transferred to or from an object via the application of force along a displacement. In its simplest form, it is often represented as the product of force and displacement.
e)Energy is very important in today's world. For example, we use different energy sources to generate the electricity we need for our homes, ...
f)Energy is produced during the process of respiration . It is stored in the form of ATP and phosphate bonds in mitochondria . When these phosphate bonds are broken then it releases energy which is used to run several metabolic activities in our body.
Answer:
- the simplest defination of energy is "the ability to do work" . energy can take number of different forms.
- the sun is the major source of light for the earth.
- work , in physics measures of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement.
- sorry Frnd I don't know this answer...