Material 1 has Young's modulus Y1 and density ?1, and material 2 has Young's modulus Y2 and density ?2 . If Y1 is 30% more than Y2 and ?1 is 30% less than ?2, which material has the higher speed of sound and how much higher is it?
a. Material 1 has a speed of sound more than 35% higher than material 2 b. Material 1 has a speed of sound 30% higher than material 2.
c. Material 2 has a speed of sound more than 80% higher than material 1 d. Material 2 has a speed of sound 30% higher than material 1.
a
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The work energy theorem says
A) the net work done is equal to the initial kinetic energy less the final energy. B) the net work done plus the final kinetic energy is the initial kinetic energy. C) the net work done plus the initial kinetic energy is the final kinetic energy. D) the net work done minus the initial kinetic energy is the final kinetic energy. E) final kinetic energy plus the net work done is the initial kinetic energy.
Which of the following would be considered basic research?
A) examining why a mouse likes cheddar cheese more than swiss cheese B) studying ways of catching mice safely C) testing the strength of a mouse cage D) examining how quickly a trapdoor closes E) testing a safe, nontoxic mouse glue
When an object is dropped from a tower, what is the effect of the air resistance as it falls?
a. does positive work b. increases the object's kinetic energy c. increases the object's potential energy d. None of the above choices are valid.
If a wave has a frequency of 6 Hz, it has a period of
a. 1/6 s. b. 6.5 s. c. 6 s. d. 3 s.