Why does a helium balloon rise in the air while an ordinary balloon filled with air does not?

A 2-KG sample of metal increases in temperature by 20 C when heated on a stove for 3 minutes. Can you predict what will happen to the temperature rise of 4 kg sample of the same material when heat on the same stove for 6 minutes

How do the properties of salt compare with the properties of sodium and chlorine

A bottle rocket takes off with a = 34.5 m/s2. It fires until it reaches a height of 200 m, then shuts off, and gravity takes over. How much time does it take to reach its maximum height? (Unit = s)

What is gravity and why is it important to man

As friends frequently do, Josh and John stand at either end of a very long, stationary skateboard, with Josh at the front and John at the rear.

Whats a similarity between distance and displacement

What is the difference between analog and digital sound transmission?

A 20 kilogram ball rolls down a 10 meter ramp at the rate of 15 meters per second.

Why does the falling speed of a ball keeps increasing every second when it is dropped from a building?

In your own words describe an interaction between the chromosphere and the hydrosphere