Search our library of homework questions

Top answers

All subjects

All levels

A model truck A of mass 1.2 kg is travelling due west with a speed of 0.90 m/s . A second truck B of mass 4.0 kg is travelling due east towards A with a speed of 0.35 m/s .

a) Calculate the magnitude of the total momentum of the trucks.

The momentum (p) is the mass (m) of an object multiplied by its velocity (v).

p = m x v

Answered by Anna L. • Physics tutor

16345 Views

Karen got 32 out of 80 on a Maths test. She got 38% on an English test. Which test did she do better in?

32 out of 80 on a Maths test38% on an English testAs we don't know any other information about the English test (e.g. her mark and the total mark) the only way that we can compare the two...

Answered by Vicky C. • Maths tutor

12736 Views

Explain in terms of ΔG, why a reaction for which both ΔH and ΔS are positive is sometimes spontaneous and sometimes not.

For a reaction to be spontaneous delta G has to be negative according to the equation delta G = delta H - TdeltaS. Therefore if the temperature of a reaction is very high then -TdeltaS will be greater ...

Answered by Aaron C. • Chemistry tutor

17793 Views

How do you create commands (imperatives) in Spanish?

There are two basic forms of imperatives, negative imperatives and positive imperatives, and these can be divided into informal (tú) and formal commands (ustedes/ vosotros).

Let's start w...

Answered by Lauren C. • Spanish tutor

4140 Views

What's the best way to revise for my exam?

I always found that the best way to revise, above anything else, was making sure I knew exactly what was going on in the text I was studying. You can do this by re-reading the text and by checking Spar...

Answered by Lauren C. • English and World Literature tutor

4951 Views