The correct symbol is 4He. You may also encounter it displayed as helium-4, He-4.
Answer:
ultra sounds have frequency higher than the upper audible limit of human hearing, for healthy, young adults.
Explanation:
Answer:
The work done is 120000 J.
Explanation:
Given that,
Weight = 600 N
Distance = 200 m
We need to calculate the work done
Using formula of work done

Where, F = force
d = distance
Put the value into the formula


Hence, The work done is 120000 J.