Watts to joules
[DOC File]Cabrillo College
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How many Watts (Joules per second) do you think you can keep up for an hour? I think I can sustain _____ watts for an hour. 5) Cost of Energy. (please do the bike station before this one.) When PGE charges you for electricity, they charge in units called Kilowatt-hours. (abbreviated kWh) This is the energy you would use by pedaling at a rate of ...
[DOC File]Name
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11. How much time is needed to produce 720 Joules of work if 90 watts of power is used? 12. If 68 W of power is produced in 18 seconds, how much work is done? 13. A set of pulleys lifts an 800 N crate 4 meters in 7 seconds. What power was used?
[DOC File]Lick Observatory
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B) Power is measured in joules and energy is measured in watts. C) Power is used to describe energy of light, while the term energy has a broader meaning. D) There's no difference: Energy and power are different names for the same thing. Answer: A. 2) Visible light from a distant star can be spread into a spectrum by using a glass prism or
[DOC File]Name
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How much time is needed to produce 720 Joules of work if 90 watts of power is used? W = 720 J t = W/P t = 8 sec. P = 90 W t = 720 J/90 W. 12. If 68 W of power is produced in 18 seconds, how much work is done? P = 68 W W = Pt W = 1,224 J. t = 18 sec W = 68(18) …
[DOC File]Activity 1.2.5 Mechanical System Efficiency ATV
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Determine the output power of the system for each test. Your final answer will be in watts. Formula Substitute / Solve Final Answer (0.0) 0J/180 0W 168000J/360 466.66W 264000J/720 366.66W To calculate power of an electrical system, multiply the current and voltage. Substitute and solve to discover how many watts were put into your system.
[DOC File]Calculating Work and Power by Climbing Stairs
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Climbing Stairs Slowly Rapidly Work done (Joules) Was the work done by climbing the stairs slowly the same as or different from climbing the stairs rapidly? Does you answer surprise you? Part IV. Calculate the power output of climbing the stairs slowly and rapidly in watts. Record your answers in the appropriate spaces below.
[DOC File]Lick Observatory
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A) watts . B) joules . C) Newtons . D) watts per second . E) watts per square meter . Answer: E 6) If the distance between us and a star is doubled, with everything else remaining the same, the luminosity . A) is decreased by a factor of four, and the apparent brightness is decreased by a factor of four.
Power, Work, and Force I
If 478 watts of power are used in 14 seconds, how much work was done? 3. How long does it take to do 432 joules of work with 75 watts of power? 4. If it takes 726 watts of power to do work in 14 seconds, what is the work done? 5. How much power is used to move a 25 N object 8 meters in 15 seconds (hint: solve for work first)?
[DOC File]Efficiency of a Light Bulb
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E (joules) = (watts) (time in seconds) Watt = (current in amps) (voltage) Joule = watt -second. Calculate the energy released as heat (Q): Q = (m) (c ) (change t) Q (released from light bulb in joules) = (mass of air in g) (specific heat air in Joules) (change t in oC) Specific heat air = 1.012 joules / gram - oC
[DOC File]Steve Boddeker's Energy and Society Ch 1 Homework
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1×106 joules/sec. 9.8 joules. 1×105 Btu. 1×106 joules. 9.8×105 watts. 9.8×106 joules. In the United States, the average person eats about 3000 food Calories per day. What is the average power of this energy intake? 14.5 watts. 145 watts. 1450 watts. 14,500 watts. Bonus The Principle of …
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