One if they are competent.
because people needed to raise and lower water levels
raise!
When a person climbs a ladder, his muscles provide the energy (work) to raise the person's weight from the ground to the top of the ladder. When the person climbs a ladder carrying a load in addition to his body, his muscles provide the energy (work) to raise his weight from the ground to the top of the ladder, plus the additional energy (work) to raise the load from the ground to the top of the ladder. The more weight goes up the ladder, the more work is done. Of that you can be positive.
1 BTU needed to raise or lower 1degree F of 1 lb water
raise
In quantum mechanics, the ladder operators can be used to determine the eigenvalues of the x operator by applying them to the wavefunction of the system. The ladder operators raise or lower the eigenvalues of the x operator by a fixed amount, allowing us to find the possible values of x for which the wavefunction is an eigenfunction. By repeatedly applying the ladder operators, we can determine the eigenvalues of the x operator for a given system.
raise
There are usually two ways to lower a basketball net. Either there will be a lever on the back, and you would scroll that around to raise or lower, or there is a lever, and you pull it down to raise the net and push it up to lower the net.
A step ladder is a type of inclined plane simple machine. It allows you to raise yourself to a higher position by exerting a smaller force over a longer distance along the length of the ladder.
The sharp sign (#) to raise a note, the flat sign (b) to lower.
Lower
biceps