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Explain the changes in momentum when a satellite fires its propulsion system (3 marks) This is from the 2008 HSC. When answering this question do I refer to the law of conservation of momentum and how in a closed system interaction, the momentum is always unchanged. So when the propulsion is...

Im having problems with question 4 part ii part alpha. The answers just say if y=a. Then pq=1 Thanks for any help

Breaking Bad!!!

thanks! LOL sorry didn't know about the rep system, haven't been on BoS in a while.

A 50Kg man climbs to the top of a bungee jump platform, exactly 100m above a river. he is securely attached to a rubber bungee rope. The man leaps off the platform. He free falls for 50m and then the bungee rope stretches a further 50m, stopping the man safely, just above the river. a)...

Oh ok, forgot about that! I'm new to this. Thanks!

bump.

A particle executes simple harmonic motion. When it is 2cm from its equilibrium position, its velocity is 6cm/s; when it is 3cm, its velocity is 4cm/s. Find the period of its motion and the amplitude. Thanks! Any help will be repped.

If you have the time i'd recommend reading the books. I hardly read books, but this series is just too good. has to be the best of its genre.

^Gotta love joffrey's cowardice when it comes to a real fight. All words.

Thanks man! Really helped.

bump

Try this website, *******.org

Two Straight roads meet at an angle of 60 degrees. Car A starts from the intersection and travels along one road at 40km/h. one hour later Car B starts from the intersection and travels along the other road at 50 km/h. At what rate is the distance between them changing three hours after Car A...

http://en.wikipedia.org/wiki/Execution_of_Saddam_Hussein

No he was caught by the US and then they handed him over to the Iraqis. They gave him a trial and he was sentenced to death. So he was executed not assassinated.

Thanks barbernator! After looking at your solution I realised I made a stupid mistake in my method. Thanks again.

Well, For the co-ordinates of R I got [3a(t-s),3ast]. Does that seem right barbenator? For some reason the book doesn't have the answers for the co-ordinate part.

When I find the equation of the normals. they both have s and t in them. I couldn't eliminate them. So i can't solve them simultaneously. Am I supposed to use the second part of the question for this. Where st=-2?

The normals to the parabola x^2=4ay at the point P(2at,at^2) and Q(2as,as^2) meet at R. Find the co-ordinates of R in terms of t and s. If st=-2, find the cartesian equation of the locus of R I've been stuck on this for quite a while. Any help would be appreciated.