123 Answered Questions for the topic Energy

05/23/16

Electric potential energy? Capacitance?
a. Calculate the electric potential energy stored in a 1.7 × 10–11 F capacitor that stores 3.40 × 10–10 C of charge at 20.0 V.   b. Calculate the capacitance of a system that stores 8.0 × 10–10 C... more
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05/04/16

Input and Output Energy
A light bulb has output energy of light and heat. List five other appliances. For each appliance, the input energy is electrical. What is output energy?
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Energy

03/27/16

How much less, and what becomes of this energy?
Consider the elastic collision between two freight cars in figure 3.9. The momentum before and after the Collision is the same. The KE, however, is less after the Collision than before. How much... more
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Energy

03/09/16

Rearrange Q=mC?t to solve for m,c,?t
Hi, I need help re arranging the equation. Thanks. 
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02/17/16

Help explaining physics
Question: As the speed of a bicycle moving along a level horizontal surface changes from 2 m/s to 4 m/s, the magnitude of the bicycle's:   Multiple Choice: a. total energy remains the same b.... more
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01/22/16

Is sound energy renewable or non-renewable?
Is sound energy renewable or non-renewable?
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01/09/16

Define Energy
Dear teacher People say : energy is the ability to do work But then" what is work ?" I asked : they said " work is energy tranfered by force " Bla , they use energy to define work and work to... more
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Energy Physics Work Slide

11/13/15

two mass connected by string on a slide... about the work and energy things
There a mass of 4kg and a mass of 5kg connected by an inextensible string passing over a smooth pulley .the mass for 4kg starts from rest and moves up the smooth plane inclined at 30degree to... more
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11/10/15

Quick Science Question: Calculating Thermal Energy?
A model rollercoaster car weighs 3 kg. If it reaches 5 meters, how much energy is transformed into thermal energy at that point?  I have other values too (it's a multiple part... more
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11/02/15

A 45.2kg boulder falls off a mountain that is 255 m tall. What is the kinetic energy of the boulder when it falls off the cliff?
I know the answer might be 0J but I need help explaining how to get the answer
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10/30/15

A particle with total energy E in Potential energy region U(x).Motion of the particle is restricted to the region when ? check description
A particle with total energy E in Potential energy region U(x).Motion of the particle is restricted to the region when  options are (a) U(x)>E (b) U(x)<E (c) U(x)=0 (d) U(x) < or = E
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10/30/15

Car have mass m,its engine delivers power P.what's the minimum time in which car can be accelerated from rest to speed v
A car of mass m has an engine which can deliver power P.The minimum time in which car can be accelerated from rest to a speed v is(a) (mv^2)/2P(b) Pmv^2(c) 2Pmv^2(d) (mv^2)P/2
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Energy Work Power

10/30/15

Find mechanical power?
The blades of a wind mill sweep out a circle of area A.If wind flows with velocity v perpendicular to blades of wind mill and its density is D,then the mechanical power received by wind mill is (a)... more
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Energy Work Power

10/30/15

Find Power ?
A pump is used to pump a liquid of density D continuously through a pipe of cross section area A.If liquid is flowing with speed v,then power of pump is(a) (DAv^2)/3(b) (DAv^2)/2(c) 2DAv^2(d)... more
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07/22/15

Physics: What are the following for this system: amplitude, frequency, period, spring constant, max velocity and total energy?
A 27.8 gram mass oscillates on the end of a spring and its motion can be described by: (1.5 )sin (21.4 t ) [here the units are standard, meters and seconds]   What are the following for this... more
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07/15/15

Physics: amplitude, frequency, period, spring constant, max velocity and total energy
A 27.8 gram mass oscillates on the end of a spring and its motion can be described by: (1.5 )sin (21.4 t ) [here the units are standard, meters and seconds] What are the following for this system:... more
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07/10/15

Physics: Thermodynamics (ice)
If a 0.06247 kg ice cube initially at 0.00 C is allowed to melt in a Styrofoam cup holding 0.497 kg of water at 10.0 C , what is the total entropy change for this process?
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07/06/15

Physics: Change in internal Energy
2.50 moles of an ideal monatomic gas are compressed from 315,000 Pa to 175,000 Pa at 0.0300 m3. What is the change in internal energy in this isochoric process?
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Energy Physics Speed

06/11/15

a spring of force constant 200N/m is compressed through a distance of 0.05m calculate the energy stored in the string
 I.calculate the energy stored in the string II.if the energy in (I.) above is imparted to a body of mass 0.5kg to set it in motion calculate the speed acquired by the body
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Energy

05/04/15

How much energy in kilocalories(kcal) would combustion of 0.420 ounces of methane release?
The combustion of 45.0g of methane (natural gas) releases 2498 kJ of heat energy. How much energy in kilocalories(kcal) would combustion of 0.420 ounces of methane release?
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05/03/15

Ideal gas, potential energy help
Let us consider an ideal gas in a gravitational field which is uniform with strength g. The gas is trapped in a highly realistic h=10km vertical column of height h with perfectly insulating walls.... more
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04/16/15

Physics-Energy/ conservation of energy
Question: At a water park, Hugo climbs a 15.00m springboard, in 22.00s, to execute his famous THUNDER CANNON BALL. Hugo jumps up at 6.000m/s [up] off the end of the diving board and propels his... more
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01/04/15

What is the energy transfer of a battery rolling out of a rolling cup?
A cup is on its side. inside the cup is a double A battery. An object hits the cup forcing the cup to roll. As the cup rolls the batter rolls out. What is the energy transfer of the battery rolling... more
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11/10/14

Calculate the energy cost (kWh/p/d)
Australia produces 20 megatonnes (Mt) of alumina every year, where each tonne requires 3.8 MWh of heat energy to produce. Calculate the energy cost (kWh/p/d) to produce alumina spread across the... more
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11/10/14

Calculate the pumped storage capacity
Two of the largest dams in Australia’s Snowy Hydro scheme are Lake Eucumbene (4500 GL storage capacity) and Blowering Dam (1628 GL storage capacity), which is situated 803m below Lake... more
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