Electroencephalography (eeg), in which electrodes placed on the scalp pick up electrical signals underneath, and magnetoencephalography (meg), which detects magnetic indications of brain activity, are examples of what?

The two required components for a generator are

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.