18. The form of energy mostly used by societytoday is chemical energy. nuclearen

Question

18. The form of energy mostly used by societytoday is
      chemical energy.
       nuclearenergy.
            solar energy.
       geothermalenergy.


19. What is entropy?
          The transformation of high-quality energy tolower quality energy.
       A measure of the quantityof high-quality energy present in a system.
       A measure of the amountof disorder or randomness in a thermodynamic system.
       A measure of the quantityof work available in a system.


20. A scientific law describes
       how things must happen innature.
       an important relationshipthat is supposed to happen in nature, but only if the law isobeyed.
       an observed pattern of arelationships between variable.
            a hypothesis that has been proven to betrue.


Which of the following must be satisfied for a vibration tobe simple harmonic motion? The restoring force of the vibratingobject is
       inverse to thedisplacement.
            proportional to the object's mass.
       not related to thestretching force.
       opposite to andproportional to a displacement.


Today, most of the energy needs in the USA are suppliedby
           nuclear
       coal
       petroleum
       natural gas


What is the correct expression for the amplitude of a vibratingmass? Amplitude is the
       sum of the massdisplacements over time.
       value of the mass dividedby frequency at the rest position.
       maximum displacement ofthe mass from the rest position.
           maximum velocity of the mass duringvibration.


What is a wave? A wave is the propagation of
       matter.
       adisturbance.
          vibrating matter.
       a medium.


Which of the following describes the basic kinetic energy of a gas?A gas possesses vibrational
       energy only.
       and translational energyonly.
       rotational, andtranslational energy.
             rotational, and some translationalenergy.


Sound travels about 5,000 ft/s in seawater. If a sonar devicesent a sound straight down to the bottom of the sea and thereturning echo was heard 0.50 s later, how deep was theocean?
       2500 ft
       5000 ft
           1250 ft
       1000 ft

Explanation / Answer

1. Chemical energy is the most widely used form in the burning offossil fuels 2.Entropy is the measure of the amount of disorder in a system 3. A scientific law describes how things must happen in nature 4. The restoring force in SHM is proportional to the mass as seenin the equation F=ma 5.Most energy needs in the US are currently fueled by petroleumgas 6.amplitude is the maximum displacement of the object from restposition 7.A wave is a propagation of a disturbance 8.A gas contains all three types of kinetic energy 9.if the echo was heard .5 seconds later and sound travels at5000ft/s then sound travels 2500ft every half second, so the depthof the ocean is 2500ft

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