Which of the following quantities are units of momentum? (There could be more than one correct choice.)
A) N ? m
B) kg ? s/m
C) kg ? m/s
D) N ? s
E) kg ? m2/s2
C, D
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Neutron stars are supported by _____
a. hydrogen degeneracy pressure
b. neutron degeneracy pressure
c. neutron gas pressure
d. electron degeneracy pressure
e. hydrogen gas pressure
A free electron and a free proton are released in identical electric fields. (i) How do the magnitudes of the electric force exerted on the two particles compare?
1.It is millions of times greater for the electron. 2.It is thousands of times greater for the electron. 3.They are equal. 4.It is thousands of times smaller for the electron. 5.It is millions of times smaller for the electron.
If the stars at the turnoff point of a cluster have a mass of 3 M?, what is the age of the cluster?
a. 3.0 x 1010 years b. 3.3 x 109 years c. 6.4 x 108 years d. 1.6 x 1011 years e. The age of a star cluster can not be determined from the mass of stars at the turnoff point.
A(n) ____________________ is a cool, dense cloud of dust and gas that is undergoing gravitational contraction
Fill in the blank(s) with correct word