(1) A 65.0-kg firefighter climbs a flight of stairs 20.0 m
high. How much work is required?

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

i think they are all correct

explanation:

they seem good

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

answer(20) psi;