Answer:
A machine have 75% efficiency means 25% of efficiency has been lost due to friction and a machine can work 75% only.
The planet Earth itself is considered to be a closed system because there is a limit to the amount of matter that is exchanged. However, there are open systems that are ON Earth.
Answer:
Example of a fusion dish: combination of smoked salmon wrapped in rice paper, with avocado, cucumber and crab sticks. Fusion cuisine is cuisine that combines elements of different culinary traditions that originate from different countries, regions, or cultures.
It is for safety if you come to a sudden stop like newtons law say if an object is in motion it stays in motion until a force stops it if the bike suddenly stopped then you would fly off because you wold still be going. and the gear helps protect you.
Answer:(3)
Explanation: 2Al+3H2SO4----->Al(2SO4)3+3H2
