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When do I use the verb 'ser' and when do I use the verb 'estar'?

Good question, they both mean to be. 'Ser' is for permanent states, for example, 'soy Ben', meaning 'I'm Ben'. That will always be my name, so we use 'ser'. 'Estar' is used for temporary states or to state w...
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Answered by Ben H. • Spanish tutor
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What effect does temperature change have on an equilibrium reaction?

First, it depends on whether the forward reaction is exothermic or endothermic. Lets use the formation of ammonia as an example: N2 + 3H2 <-> 2NH3. The forward reaction is exothermic, so it releases en...
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Answered by Falaq G. • Chemistry tutor
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In To Kill a Mockingbird, How does Atticus encourage his children to have empathy for others?

Atticus tries to help his children empathise with others in To Kill a mockingbird. In a world where people judge each other based on their skin colour and class, Atticus wants his children to treat other peo...
EC
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Car 1 has a of mass 1000kg and is going at 20m/s. Car 2 has the same mass as Car 1 and is stationary. If they collide and travel together as one unit in the same direction as Car 1 was going, calculate the speed of the unit after the collision.

By Conservation of Momentum Total Momentum Before= Total Momentum After thus m1v1+m2v2=(m1+m2)v3 Plugging in the numbers and re-arranging for v3 gives 1000 20+1000 0=2000*v3 v3=(1000*20)/2000=10m/s
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Answered by Aamir H. • Physics tutor
16417 Views

Write (x-2)/3 + (x+3)/5 as a single fraction

To write this sum as a single fraction we need to put both of them over a common denominator. Our common denominator will be the simplest thing that has both 3 and 5 as a factor, which is 15 (x-2)/3 + (x+3)/...
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Answered by Nisha C. • Maths tutor
12048 Views