To say that an object is being accelerated, means that
1) it is at rest,
2) it is moving,
3) it is either at a state of rest or a state of constant velocity,
4) its state of motion is changing,
and we define acceleration to be
5) a change in speed.
6) a change in velocity.
7) the rate at which speed changes.
8) the rate at which velocity changes.
Answer: 4, 8
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Tides are influenced by
a. the moon b. the sun c. the uneven surface of the earth d. all of the above e. none of the above
The general formula RNH2 is that of
a. an ester. b. an amine. c. an amide. d. none of these
In an RLC series circuit, which of the following statements is true?
A. The current is in phase with the voltage across the inductor. B. The current is in phase with the voltage across the resistor. C. The current is in phase with the voltage across the capacitor. D. None of the choices are true.
In designing buildings to be erected in an area prone to earthquakes, what relationship should the designer try to achieve between the natural frequency of the building and the typical earthquake frequencies?
A) The natural frequency of the building should be exactly the same as typical earthquake frequencies. B) The natural frequency of the building should be very different from typical earthquake frequencies. C) The natural frequency of the building should be almost the same as typical earthquake frequencies but slightly higher. D) The natural frequency of the building should be almost the same as typical earthquake frequencies but slightly lower.