In the SI, weight is expressed in units of ______________
Fill in the blank(s) with correct word
newtons
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What is the geometric shape of Earth?
A. an oblate spheroid B. flat C. a prolate ellipsoid D. a perfect sphere E. an annular toroid
The overall helium fusion reaction is
A) three helium nuclei fusing to form one carbon nucleus. B) two helium nuclei fusing to form one beryllium nucleus. C) two hydrogen nuclei fusing to form one helium nucleus. D) four helium nuclei fusing to form one oxygen nucleus.
Which of the following statements about various stages of core nuclear burning (hydrogen, helium, carbon, and so on) in a high-mass star is not true?
A) Each successive stage creates an element with a higher atomic number and atomic mass number. B) As each stage ends, the reactions that occurred in previous stages continue in shells around the core. C) Each successive stage lasts for approximately the same amount of time. D) As each stage ends, the core shrinks and heats further.
The first observation of electron diffraction was done by
A. J. J. Thompson. B. Louis de Broglie. C. Neils Bohr. D. Einstein and Planck. E. Davisson and Germer.