Physics, 30.01.2020 19:56 Ezonthekid

Question 1 if you do 1,000 j of work on a system and remove 500 j of heat from it, what is the change in its internal energy?
a.-1,500 j
b.-500 j
c.1,500 j
d.500 j

question 2 the first law of thermodynamics is related to the conservation of which quantity?
a. matter
b. heat
c. work
d. energy

question 3 which of the following devices does not convert heat energy to mechanical energy?
a. internal combustion engine
b. windmill
c. steam turbine
d. coal-fueled power plant

question 4 which of the following statements correctly describes a heat engine?
a. work is used to transfer thermal energy from a hot reservoir to a cold one.
b. work is done by transferring thermal energy from a cold reservoir to a hot one. c. work is used to transfer thermal energy from a cold reservoir to a hot one.
d. work is done by transferring thermal energy from a hot reservoir to a cold one.

question 5 how much work can be extracted from 5.00 × 104 j of heat when 2.00 × 104 j of heat is exhausted?
a.7.00 × 104 j
b.3.00 × 104 j
c.3.00 × 104 j
d.7.00 × 104 j

question 6 which of the following statements would best describe how to increase the work done by a heat engine?
a. raise the temperature of the exhaust.
b. raise the temperature of the cold reservoir.
c. lower the temperature of the exhaust.
d. lower the temperature of the hot reservoir.

Answers: 1

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Answers

1. U = Q + W
U = -500 + 1000
U = 500 J

2. The first law of thermodynamic is about the law of conservation of energy where energy in should be equal to energy out.

3. It is the windmill that does not transform energy from heat to mechanical instead it is the transforms the opposite.

4. In a heat engine, work is used to transfer thermal energy from a hot reservoir to a cold one.

5. 5.00 × 10^4 J - 2.00 × 10^4 J = 3.00 × 10^4 J

6. To increase the work done, we raise the temperature of the cold reservoir.

Answer from: Quest

the body's situation won't change the forces are equal opposit and on the same body

Answer from: Quest

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

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Question 1 if you do 1,000 j of work on a system and remove 500 j of heat from it, what is the chang...

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