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What is action painting and where does it stand in modern art?

Action painting is an artistic style and technique consisting in the splashing, spilling and throwing of paint directly onto the canvas. It was developed in America in the middle of the 20th century (1940-19...
EP
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Explain what is meant by tensile stress and tensile strain.

Tensile stress is the force exerted per unit cross-sectional area on an object. Tensile strain is the extension per unit original length of an object.
PJ
Answered by Penelope J. • Physics tutor
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Given that z = a + bj, find Re(z/z*) and Im(z/z*).

By definition z* = a - bj. We can write z/z* = ((a+bj)/(a-bj))*(a+bj)/(a+bj). We calculate this to be z/z* = (a^2-b^2)/(a^2+b^2) + j(2ab)/(a^2+b^2). Therefore, Re(z/z*) = (a^2-b^2)/(a^2+b^2). Im(z/z*) = (2ab...
PJ
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State what is meant by isotopes?

Isotopes are atoms with the same number of protons, but a different number of protons. Therefore, isotopes have the same atomic number but a different mass number. An example of an isotope is carbon-13, an i...
CH
Answered by Charlie H. • Physics tutor
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Compare the advantages and disadvantages of the two methods of generating electricity (figure 1 in answer):

Figure 1 (AQA GCSE Science A Physics: Higher Tier): The wind turbine costs £50 000 to buy and install. The hydroelectric generator costs £20 000 to buy and install. The average power output from the wind tur...
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Answered by Charlie H. • Physics tutor
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