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.

answer; i believe that the correct answer is (d) a very small amount of mass

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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