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What are the changes in energy that an object experiences when it is launched vertically at a given velocity into the air and falls back to the ground? This question ignores air resistance.

When the object is launched into the air it has a kinetic energy proportional to its velocity squared. As it travels its energy is converted into gravitational potential energy as it slows down due to the ef...
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Answered by Andrew H. • Physics tutor
2527 Views

Write the equation for photosynthesis

6H 2 O + 6CO 2 --> C 6 H 12 O 6 + 6O 2
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Answered by Nathan S. • Biology tutor
3044 Views

How do I know the formula for salts formed in a reaction?

Example: NaCl. Every element in group 1, including sodium, has one electron in its outer shell and it wants to lose this one electron to have only full shells. Everything in group 7, including chlorine, has ...
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Answered by Lauren T. • Chemistry tutor
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Anna and Lionel share $675 in the ratio 4 : 5 Lionel gives 3 5 of his share of the money to his mother. How much money does Lionel give to his mother?

4 + 5 =9Lionel receives 5/9 x $675 = $375Lionel's mum receives 3/5 x $375 = $225
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Answered by Asiyah I. • Maths tutor
12938 Views

Solve the simultaneous equations. 2x+5y=-4 and 7x+y=19

This can be solved using either substitution or elimination. I think this question is best approached by elimination. By elimination: Multiply the second equation by 5. The minus the first equation from the ...
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Answered by Nisha W. • Maths tutor
3779 Views