Emission lines in the spectrum of the Crab Nebula exhibit a Doppler shift, which indicates that gas in that part of the nebula closest to us is moving toward us at 1450 km/s. Assume that the expanding gas has been moving at the same speed since the original supernova explosion, observed in 1054 A. D., and calculate what diameter (in light years) we should observe the nebula to have today.

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.

b. a lightning bug, plug of grass, and a worm

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft