Consider the magnitude of the average speed, vavg, speed, mag, and the magnitude of the average velocity, vavg, velocity, mag, for the same trip. Which of the following is always true?
a. vavg, speed, mag = vavg, velocity, mag
b. vavg, speed, mag ? vavg, velocity, mag
c. vavg, speed, mag ? vavg, velocity, mag
d. none of the above
b
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If a force is applied parallel to a reinforcing phase of a composite material, the elastic modulus is calculated with the rule of _________.
Fill in the blank(s) with the appropriate word(s).
The wavelengths of radiation from a star that is moving away from us
A) can be longer or shorter depending on the distance to the star B) are shorter than if the star were not moving C) are the same as if the star were not moving D) are longer than if the star were not moving
The process that effectively regulates Earth's average temperature is
a. the greenhouse effect. b. Rayleigh scattering. c. the dew point. d. auroras.
A non-uniform, 80-g, meter stick balances when the support is placed at the 51.0-cm mark. At what location on the stick should a 5.0-g tack be placed so that the stick will balance at the 50.0 cm mark?
A) 16.0 cm B) 67.0 cm C) 66.0 cm D) 35.0 cm E) 34.0 cm