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An exo-planet orbits its local star, of mass 2.00x10^30kg, in a steady circular orbit of radius 8.00x10^8km. Calculate the orbital period of the star, in years.

Key idea is equating gravitational force between planet and star (right hand side) with the centripetal force necessary to maintain the orbit (left hand side): ( mv 2 )/r = (GMm)/r 2 Notice how the mass of t...
Answered by • Physics tutor
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Cells divide within organisms using a process called mitosis. When sex cells (gametes) are formed, they undergo a different process called meiosis. Describe three key differences between the two processes. (3)

The key differences between mitosis and meiosis are:-Mitosis produces 2 daughter cells, where as meiosis produces 4 daughter cells. (1)-Mitosis produces genetically identical cells, where as meiosis produces...
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Answered by Hannah B. • Biology tutor
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Why would you use a stratified sample of participants when carrying out a study?

A stratified sample of participants means the proportion of one group of participants in relation to the others in the real world is reflected in your sample. This can be useful in a study about where a mino...
Answered by • Psychology tutor
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Analyse this unseen poem, 'Handbag' by Ruth Fainlight

HandbagMy mother's old leather handbag, crowded with letters she carriedall through the war. The smellof my mother's handbag: mintsand lipstick and Coty powder.The look of those letters, softenedand worn at ...
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Share £200 in the ratio 2:3

200/(2+3) = 4040 2 = 8040 3 = 120£80:£120
Answered by • Maths tutor
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