Author Question: If a galaxy is moving away from us at 1.0 of the speed of light, use Hubble's law to estimate how ... (Read 80 times)

formula1 · **on:** Jul 29, 2018

If a galaxy is moving away from us at 1.0 of the speed of light, use Hubble's law to estimate how far away it is from us if the Hubble constant is 22 km/s per million light-years. (c = 3.00 108 m/s, 1 ly = 9.461 1015 m, 1 y = 3.156 107 s)

A) 140 ly
B) 14 ly
C) 140 thousand ly
D) 140 million ly
E) 140 billion ly

Question 2

A baseball has mass 143 g and a speed of 45 m/s, with the speed known to within 0.10.

What is the minimum uncertainty in the position of the baseball? (h = 6.626 10-34 J s)
A) 1.4 10-30 m
B) 1.8 nm
C) 1.4 10-32 m
D) 1.6 10-32 m
E) 1.6 10-30 m