Physics
Flywheel is an important part of a steam engine because it :

Gives strength to the engine
Decreases the moment of inertia
Helps the engine in keeping the speed uniform
Accelerates the speed of the engine

ANSWER DOWNLOAD EXAMIANS APP

Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

metals are good conductor of heat
plastics have a lower density than metals
plastics have a higher thermal conductivity than metals
metals have higher thermal capacity than plastics

ANSWER DOWNLOAD EXAMIANS APP