The approximate daily energy consumption of primitive humans (before fire) was about
a. 2000 kilojoules.
b. 8000 kilojoules.
c. 12,000 kilojoules.
d. 48,000 kilojoules
e. 400,000 kilojoules.
B
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Which of the fields are physically impossible and why?
A. This field violates the Ampere-Maxwell law. B. This field violates Gauss’s law for the magnetic field. C. The field violates both of the above laws. D. This field is physically possible.
Credit for research in our knowledge of atomic spectra includes
A) Johann Jacob Balmer. B) Johannes Rydberg. C) Walter Ritz. D) all of the above E) none of the above
You push your physics book across a table. The book weighs 8 N, you push with a steady 5 N force, and the force of friction against the book is 3 N. You push the book a distance of 2 m. The amount of work you do on the book is
A) zero. B) 6 J. C) 16 J. D) 10 J. E) impossible to tell without more information.
An electron in a hydrogen atom has orbital quantum number l = 7. How many possible values of the magnetic quantum number ml could it have?
A) 15 B) 98 C) 6 D) 7 E) 33