Answer: C
Telescope
Explanation: A telescope is an optical device in which scientists ( astronomers) use to view far away distance objects in the universe.
The single invention of the telescope has advanced what we know about the universe more than any other scientific technology. Because with the use of telescope alone, astronomers could view and study many heavenly objects or bodies and many planets in the universe.
The optical instrument makes very far distant objects appear magnified by using an arrangement of lenses or curved mirrors and lenses for clearer viewing of heavenly objects and planets in our universe.
Answer:
Explanation:
It is frictional force of the ground that helps in bringing the vehicle to stop . In the process of stopping , negative work is done on the car by friction force to overcome its kinetic energy .
At levelled road , for stoppage
Kinetic energy of vehicle = Work done by frictional force . = friction force x displacement .
At upward slopping road , gravitational force acting downward also helps the vehicle to stop do friction has to do less work .
At upward inclined road , for stoppage
Kinetic energy of vehicle = Work done by frictional force + work done by gravitational force = (friction force + gravitational force ) x displacement .
Hence displacement is less .
At downward slopping road , friction has to do more work because friction has to do work against gravitational force acting downwards wards and kinetic energy of the vehicle also .
At downward inclined road , for stoppage
Kinetic energy of vehicle + work done by gravitational force = Work done by frictional force = friction force x displacement .
Hence displacement is more .
Good are free zones bad is car pollution ext.
Since energy can neither be created nor destroyed and it just changes from one form to another...so...
A.
Energy is neither lost nor gained as electrical energy is transformed into the energy of sound.
I think the answer is c AC power source
Hope this help you?
