SCMH CH 3 – Flashcards
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from a physicist's point of view, in which of the following cases has significant work been done?
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your brother throws his dirty clothes on the floor
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what did James Prescott Joule discover about heat?
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heat is a form of energy
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which of the following is a rate?
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power
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James Watt designed experiments in horsepower to:
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quantify the energy generated by a horse in mines
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in an isolated systems, the total amount of what is conserved?
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energy
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the energy in crude oil derives from what original source?
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sunlight
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if a force cannot move the object it is applied against against, then no:
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work is done
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power is how much work is done divided by:
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time
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when a system runs out of energy, it can:
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do no more work
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the watt value printed on a light bulb tells the amount of energy the light bulb is using in joules per second. which one of the following light bulbs us using the most energy?
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40-watt bulb that burns for two hours
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which of the following balls would have the greatest amount of kinetic energy if they are all traveling at 10 m/s?
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bowling ball
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what kind of energy does the pounding of ocean surf demonstrate?
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kinetic energy
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which object has the greatest amount of kinetic energy?
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300-gram baseball traveling at 50 meters/second
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the energy stored in all fossil fuels was originally in:
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the Sun
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a space capsule falling to earth would have:
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both kinetic and potential energies
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energy can be stored in a flashlight battery as:
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chemical potential energy
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a stalled car is pushed to the top of a hill, allowed to roll down the hill and started by "clutch-popping". at which point did the car have the greatest amount of potential gravitational energy?
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at the top of the hill
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which of the following has the greatest amount of gravitational potential energy?
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a bowling ball dropped from a plane
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gravitational potential energy is defined as:
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mass times height times acceleration due to gravity
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every object at rest contains potential energy equivalent to the product of its ____ times a constant, which is____.
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mass; speed of light squared
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when a meteorite hits Earth, heat is generated. Which of the following statements best describes this process?
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gravitational potential energy is converted into heat
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who turned gravitational potential energy into kinetic energy by using a paddle to heat up water and prove that heat is just another form of energy?
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James Prescott Joule
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Kinetic Energy is thought of as energy of:
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motion
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Potential energy is thought of as energy of:
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position
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stretching a rubber band is an example of storing:
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elastic potential energy
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which of the following organisms is at the first trophic level?
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plants
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the conservation law in science states that:
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the amount of energy in an isolated system stays the same
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thermal energy is measured in units of:
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calories
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to calculate how many calories your body needs to maintain your current weight for a week, you need to know all of the following EXCEPT:
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the recommended weight for your height
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the two most important alternative energy sources being developed today that are renewable are:
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solar and wind
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what percentage of energy in the United States is generated by fossil fuels?
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more than 80%
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unless we have a major breakthrough in solar energy production we do not think it will be competitive with other sources till at least what year?
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2030
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an example of a renewable energy system is:
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wind
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the burning of fossil fuels adds:
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carbon dioxide to the atmosphere
