The Hubble time is:
A) the time remaining before the Universe stops expanding and begins to contract.
B) the time it takes a galaxy moving at 1000 km/sec to move 1 Mpc.
C) an estimate of the age of the Universe based on the Hubble constant.
D) an estimate of the time it will take the Universe to double in size based on the Hubble constant.
C
You might also like to view...
A small, hot object makes thermal contact with a more massive, equally hot object. Consequently,
1.there will be a net flow of energy from the smaller object to the larger object. 2.there will be a net flow of energy from the larger object to the smaller object. 3.there will be zero net flow of energy. 4.more information is required to determine the direction of the net flow of energy.
Bohr's atomic theory predicted energy levels for hydrogen of En = (2 ?2 k2 e4m)/(hn)2. If instead we place 1 electron in "orbit" about a bare nucleus of atomic number Z, how do you expect Z to be incorporated into the En formula and why?
What will be an ideal response?
Rotational Kinetic Energy: A solid uniform disk of diameter 3.20 m and mass 42 kg rolls without slipping to the bottom of a hill, starting from rest. If the angular speed of the disk is 4.27 rad/s at the bottom, how high did it start on the hill?
A. 3.57 m B. 2.68 m C. 3.14 m D. 4.28 m
Kirchhoff's junction rule is an example of
A) conservation of energy. B) conservation of charge. C) conservation of momentum. D) conservation of energy and momentum.