Imagine for a minute that the Moon is held in its orbit about the Earth by electrical forces rather than by gravitation. What electrical charges -Q on the Earth and +Q on the Moon are necessary to hold the Moon in a circular orbit with a period of 27.3 days? The Earth-Moon distance is 384 000 km and the mass of the Moon is 7.35 1022 kg.
Question 2
An alpha particle (charge = +2e) is sent at high speed toward a gold nucleus (charge +79e). What is the electrical force acting on the alpha particle when it is at a distance of 2 10-14 m away from the gold nucleus? (e = 1.6 10-19 C)
The span of Homo sapiens sapiens’ time on earth
Electrocardiography. (a) Electrodes are placed on the patient’s chest to record the electrical event
The Sun as it appears from the surface of the Earth at Sunset.
Relationship of the electrocardiogram to electrical conduction in the heart.
The rock cycle and the Earth’s physical environment
Wavelengths that penetrate the earth's atmosphere