The gravitational field at the earth due to the moon is (the mass of the moon is 
kg and separated by a distance of 
A. 
B. 
C. 
D. 
E. 
B.
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Isotopes of the same element have the same number of protons
a. True b. False Indicate whether the statement is true or false
Which type of binary gives information about the star sizes in addition to the combined masses?
A. eclipsing binary B. spectroscopic binary C. visual binary D. apparent binary E. astrometric binary
The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be __________ times the change in length of the Pyrex glass rod
Fill in the blank(s) with correct word
Which of the following particles is NOT made up of quarks? (There may be more than one correct choice.)
A) ?-meson B) electron C) proton D) neutrino E) neutron