KE = 1/2(100 kg)(100 m/s)^2 = 500000 Joules ----------------------- KE = 1/2(100 kg)(50 m/s)^2 = 125000 Joules ---------------------- 5â¦00000 Joules/125000 Joules = 4 ------ The kinetic energy is reduced by a factor of 4 because the speed is squared.
Earth, the fifth-largest of the eight planets in the Solar System belongs to the Milky Way galaxy and is orbiting about 28,000 light years from the center of the galaxy. It is believed that currently it lies about 20 light years above the galaxy's equatorial plane in the Orion spiral arm.
A barred spiral galaxy. A spiral galaxy is a kind of galaxy that looks like a flat, slowly rotating disk with a bulge in the centre. It contains stars, gas, dust, dark matter and a supermassive black hole at its centre. Galaxies were first listed in the 18th century by William Herschel. The spiral galaxy as a type was first described by Edwin Hubble in his 1936 work The Realm of the Nebulae.