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a )John heats up 2kg of water from 20 degrees c to 80 degrees c. How much energy input did this require? b )When John weighs the water at the end, he has less than he started with. Why might this be? c) What hazards are in this experiment?

a) energy transferred = mass.specific heat capacity.temperature change, or E = m.c.theta. c is provided at 4181 joules per kg. so E = 2.4181.(80-20) = 501720 joules b) some water has evaporated off as it was...
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Answered by Ruth H. • Physics tutor
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How has the camel [shown, with summarising information] adapted to survive the desert? Briefly explain adaptation by natural selection.

Answers can include: lomg eyelashes and closing nostrils to protect from sand in the wind, large eyebrow ridge and thick eyebrows to protect from sun, thick fur to contain heat during cold nights, sandy colo...
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Answered by Ruth H. • Science tutor
4347 Views

A perfect sphere of lead has radius 6 cm, and weighs 1710 grams. What is its density? Give your answer in g/cm^3. [Density = mass/volume]

To find the density, we need to divide mass by volume, and we already know the mass, so must find the volume. V = 4/3.pi.r^2, and plugging in r=6 gives V = 48.pi, about 150.8 cm^3. The mass is 1710, which we...
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Answered by Ruth H. • Maths tutor
4309 Views

Computer Memory consists of ROM and RAM. Please explain the difference in the two types of memory.

ROM stands for Read Only Memory and RAM stands for Random Access Memory. ROM is non-volatile which means that it stores the information on it permanently and read-only. It stores the information and instruct...
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Answered by Sarah E. • ICT tutor
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Factorise and solve x^2 - 8x + 15 = 0

x^2 - 8x + 15 = 0 (x - 5) (x-3) = 0 x = 5 or x = 3
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Answered by Flora C. • Maths tutor
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