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A sphere has a surface area of 4m^2, radius r. Another sphere has radius 2r. Calculate the Volume of the second sphere in M^3.

The surface area of a sphere can be calculated using Area = 4 x Pi x r^2. Since we know the surface are of the first sphere is 4m^2, we can write: 4 = 4 x Pi x r^2. This simplifies to r^2 = 0.318. Taking the...
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Answered by Freddie W. • Maths tutor
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Describe how selective breeding could be used to improve the quality of milk produced by cows (4 marks)

Farmers could keep information on their cows such as the milk yield of a bull's mother and daughters in order to select ideal bulls as male parents. These bulls would then be allowed to mate with (unrelated)...
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Answered by Adam T. • Biology tutor
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What is the difference between primary and secondary effects of an earthquake?

Primary effects occur immediately, as a result of the earthquake itself. Example of primary effects include buildings and bridges collapsing and death and injury to people. Secondary effects can occur from h...
Answered by • Geography tutor
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Why did was there no direct conflict between the US and the USSR in the Cold War?

By 1950, both the USSR and the USA had successfully developed and tested nuclear weapons. For both countries, spending on research and development for more advanced nuclear weapons was a top priority, as a w...
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Answered by Elizabeth B. • History tutor
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Listen to this extract from the opening theme of Jaws (first 50 seconds would be played). What musical devices does Williams use to build the feeling of tension? (4 marks)

The extract begins with a rising semi-tone played at a low volume at a very low range (tessitura). The dynamics slowly increase (crescendo) throughout (1) and the semi-tone idea returns closer and closer tog...
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Answered by Alicia H. • Music tutor
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