Underline and name the figures of speech in the sentences given below.
1. I am as hungry as a horse!
2. The firecrackers shot into the sky with a bang.
3. Did you draw the diagrams of Delhi for your geography project?
4. Keep your nose out of my affairs!
5. The roses in Uma's garden are blood red.
6. The train journey to Kochi took me a hundred years!
7. The sun gazed down upon the land.
8. Maya is a fish out of water.
Answers
Answer:
If the object is lifted straight up at constant speed, then the force needed to lift it is equal to its weight mg. The work done on the mass is then W = Fd = mgh. We define this to be the gravitational potential energy (PEg) put into (or gained by) the object-Earth system. This energy is associated with the state of separation between two objects that attract each other by the gravitational force. For convenience, we refer to this as the PEg gained by the object, recognizing that this is energy stored in the gravitational field of Earth. Why do we use the word “system”? Potential energy is a property of a system rather than of a single object—due to its physical position. An object’s gravitational potential is due to its position relative to the surroundings within the Earth-object system. The force applied to the object is an external force, from outside the system. When it does positive work it increases the gravitational potential energy of the system. Because gravitational potential energy depends on relative position, we need a reference level at which to set the potential energy equal to 0.