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How many hydrogen atoms are there in a glass of water?

This question may seem extremely broad but in fact there is only one assumption one should make - the volume of the water. Let's say that there are 200mL of water in the glass. We know that the concentrat...

9333 Views

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):(mv2)/r = (GMm)/r2

Answered by • Physics tutor
1515 Views

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 genetical...

HB
Answered by Hannah B. • Biology tutor
2353 Views

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 m...

Answered by • Psychology tutor
1754 Views

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 ...

LB
40622 Views

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