There's nothing mysterious about it at all. "Frequency" simply means
"often-ness" ... how often or how frequently something happens.
-- The frequency of traditional meals is 3 per day.
-- The frequency of an equinox is 2 per year.
-- The frequency of my sleeping really late is 1 per week.
-- The frequency of my intense desire to sleep late is 30 per month.
etc.
-- The standard unit of frequency in the SI system is "per second".
The special name for that unit is "Hertz". (Hz)
Answer:
1. spring potential energy and gravitational potential energy
2. 490 joules
3. 75 joules
4. 650 joules
5. thermal energy
Water=hydrosphere
wind=atmosphere
ice=cryosphere
organisms=biosphere
I think!!