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

Physics & Space Science

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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.

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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

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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.

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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

Physics & Space Science