123 Answered Questions for the topic Energy

11/10/14

need help: true or false?
A tidal power plant has been proposed for construction in the Kimberly region of Western Australia, where extreme tidal ranges are observed. The proposed plant would produce 100 GWh of electricity... more
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11/09/14

What is the capacity factor of the wind farm?
A wind farm consists of 30 x 5 MW wind turbines, and generates 500 GWh of electricity each year. What is the capacity factor of the wind farm?
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11/09/14

How many litres (L) of fuel are needed to travel 100 km if the minibus is fully loaded?
A diesel-powered minibus carries a maximum of 12 passengers including the driver when fully loaded. The minibus has an energy cost of 14 kWh per 100 passenger-kilometers (p-km), and diesel fuel has... more
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11/09/14

Which statement best describes Australia’s performance in attempting to achieve its commitment under the Kyoto Protocol to limit greenhouse gas (GHG) emissions
A) Australia did meet its Kyoto commitments, i.e. limited GHG emissions to less than 108% over 1990 levels. B) Australia did not meet its Kyoto commitments, i.e. failed to limit GHG emissions to... more
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11/03/14

The Rydberg Equation and Ionization Energy
I'm not sure where to begin. I really need some help on this one.  I have the Rydberg equation here but I have no idea how to use the answer from the equation and use it to find the second... more
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10/21/14

How do plants store and use energy?
How do plant cells store energy? Also, how do plant cells use the energy?
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10/18/14

Are they any calculation/formula of Ocean Thermal Energy Conversion that uses the unit of power or energy?
example: kWh/d/y, w/m2 etc..
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10/17/14

Express your answer in units of kWh/d.
Chickens require 0.075 kWh per day of energy (as feed) for each kilogram of animal, and 2/3 of an adult chicken is edible meat. The lifespan of a chicken is 50 days.What is the daily energy... more
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Energy Physics

10/14/14

roller coaster energy problem
A roller coaster starts from rest at the top of a hill with 1000J of potential energy. How much kinetic energy does it have? How much total mechanical energy?  (KE + PEg + PEs) How much... more
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10/14/14

Express your answer as a percentage.
Typical fresh water usage is approximately 150 litres per day per person. If all of this water came from a desalination plant with an energy cost of 4 kWh(e)/m3 what percentage would this be of the... more
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10/14/14

Express your answer in terms of W/m2.
What is the average power per m2 of floor space for a 100 m2 apartment with a leakiness (heat-loss coefficient) of 9 kWh per day per oC and an average inside/outside temperature difference of 15oC.... more
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10/13/14

Find the energy stored in this capacitance
Two capacitors, c1= 18.0 uF and c2=36.0 uF are connected in series and a 12.0-V battery is connected across the two capacitors.    a) find the equivalent capacitance  b) find the energy stored... more
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10/12/14

Which one is the correct answer for it?
A typical residential hot water system that uses approximately 10 kWh(e)/d is replaced with an electricity-boosted solar hot water system that uses an average of 170 watts (W) of electrical power.... more
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10/12/14

Express your answer in kWh/d.
How much power is required to cool a house to 22oC on a 40oC day if the "leakiness" (heat-loss coefficient) of the house is 3.6 kWh/d/oC? You may assume that the air-conditioner cooling the house... more
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10/12/14

How many homes could be heated from this source assuming heating requirements of 40 kWh/d per house?
A thermal power plant produces 82 MWh/d of excess heat energy. How many homes could be heated from this source assuming heating requirements of 40 kWh/d per house?
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10/12/14

For how many years can this plant be operated?
A pilot geothermal plant is installed over a basin with an estimated stored heat energy capacity of 88 TJ. The geothermal plant has an average capacity of 230 kW. For how many years can this plant... more
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10/04/14

Inclined plane, physics question. Help is very much appreciated.
A 100N Box (initially at rest) is pushed 10.0m, up a rough ramp by a horizontal applied force of 150N. The ramp is inclined at an angle of 30 degreees and the coefficient of kinetic friction... more
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09/19/14

What percentage of Australia’s electricity consumption could be produced by wave farms?
It is estimated that 1 million GWh of wave energy hits Australian shores annually. Australia’s electricity consumption in 2012 was 225 billion kWh.Assuming 10% of our shores had wave farms with an... more
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Energy Math Physics Light

09/17/14

Sustainable Energy
An upper limit of 24 kWh/d/p on the power available from wind in Australia was presented, subject to certain assumptions. The installed wind capacity in Australia in December 2012 was 2.576 GW. The... more
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09/17/14

What is it’s capacity factor?
The Pelamis Sea Snake wave energy collector has a peak power output of 750 kW, and can produce 2600 MWh annually.
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08/06/14

Physics Work and Energy Question. Please check my answer.
A 5g apple is thrown straight upward with an initial velocity of 20 m/s @ a point of 1.5m height from ground. Ignoring air friction, find:   a. Total mechanical energy of the apple at initial... more
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08/06/14

Physics Work and Energy Question!
A boy pulls a 10.0 kg book rack at rest on a smooth floor with a constant horizontal force of 1.2N starting from rest. Compute the change in kinetic energy of the box after the boy has pulled it a... more
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Energy

01/28/14

what is the potential energy and why42. Calculate the work done in lifting a 100-N block of ice a vertical distance of 5 m. Gravitational potential energy  mas
 Calculate the work done in lifting a 100-N block of ice avertical distance of 5 m.Gravitational potential energy mass : accelerationdue to gravity : height; PE mgh
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