Earth has a natural greenhouse effect, principally due to water vapor.

Indicate whether the statement is true or false


Ans: True

Physics & Space Science

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Instructions: On occasion, the notation  = [A, ?] will be a shorthand notation for  .

The vector has components +5 and +7 along the x and y axes respectively. If the vector is now rotated 90 degrees counterclockwise relative to the original axes, the vector's components are now A. ?7; ?5. B. 7; ?5. C. ?7; 5. D. 7; 5. E. 7; 0.

Physics & Space Science

Relative Velocity: A swimmer heading directly across a river that is 200 m wide reaches the opposite bank in 6 min 40 s. During this swim, she is swept downstream 480 m. How fast can she swim in still water?

A. 0.50 m/s B. 0.80 m/s C. 1.2 m/s D. 1.4 m/s E. 1.8 m/s

Physics & Space Science

Compared to its neutral atom, an ion has the same number of

A) protons and neutrons B) protons but a different number of neutrons C) protons but a different number of electrons D) neutrons but a different number of protons

Physics & Space Science

Ocean waves and currents generally form as a result of

A) swells. B) the rotation of the Earth. C) differences in ocean density. D) wind.

Physics & Space Science