Why would a value of 500 km/s/Mpc for the Hubble constant contradict theories of stellar evolution?
What will be an ideal response?
The Hubble time for this value is 2 billion years. Astronomers know of globular star clusters that are significantly older than 9.5 billion years.
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The molar specific heat is the amount of heat required to raise the temperature of what amount of matter by one unit of temperature?
A) one tooth B) one unit of mass of a material C) one mole of a substance D) two moles of a substance E) one molecule of a substance
Clouds described as "artist's brushes" or "mare's tails" belong to what cloud family?
a. Middle b. Low c. High d. None of these
An 8.0-kg object moving 4.0 m/s in the positive x direction has a one-dimensional collision with a 2.0-kg object moving 3.0 m/s in the opposite direction. The final velocity of the 8.0-kg object is 2.0 m/s in the positive x direction. What is the total kinetic energy of the two-mass system after the collision?
a. 32 J b. 52 J c. 41 J d. 25 J e. 29 J
Equal currents of magnitude I travel into the page in wire M and out of the page in wire N. Eight directions are indicated by letters A through H
The direction of the magnetic field at point P is
a.
C.
b.
E.
c.
F.
d.
G.
e.
H.