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This question is from Test Paper 3 of Fitzpatrick's 3 unit textbook. ABCD is a quadrilateral and each of its sides is a tangent to a circle centre O. Prove that AOB + COD = 180. Thank you very much!!

2006 2) An object is in stable orbit around the earth. Which statement about the force acting on this object is correct? C) Gravitational force is the only force acting on the object D) There is no net force acting on the object D is the answer

Hi again! :) Sorry, i have another question. The answers in the independent trial papers and the surfing book are different. The trial papers say that there is no net force acting on a satellite in stable orbit whereas surfing says that there is a net force caused by gravitational attraction...

I spent 30 minutes trying to do that question :'( Thanks for all the help, I appreciate it :)

33) A spacecraft is rising from the Earth's surface at 49m/s. At 980m the booster rocket tanks are jettisoned. a) Calculate how long the booster tanks take to fall back to Earth. b) Calculate the speed with which the booster tanks crash into the earth. Really confused... I'm getting 15s and...

Re: How does the permeability of the armature affect the speed of rotation of a motor You're awesome! Thanks :-)

Thanks a lot :) I get it now!

I have 2 queries :) : 1) In the surfing book, they said that a spaceship in geostationary orbit is an inertial frame of reference. Why is this so? I thought it was non-inertial because even though the spaceship is travelling at a constant velocity, its direction is constantly changing, and so it...

OH! Awesome, thanks again :)

Thank you :) Can you please explain the 2^7-1 part?

8 people are to be into 2 groups. What is the probability that there will be 4 in each group? I'm getting 35/127 but the answer says 35/81. This is my working: (8C4) ÷ 2 / (8C1 + 8C2 + 8C3 + (8C4 ÷ 2) Thank you very much :)

Thank you! :) I'm not sure if anyone will see this but i have another permutations question. (i feel annoying starting a new thread) Any help is appreciated: How many different arrangements are possible if 3 letters are randomly selected from the word CHALLENGE and arranged into ‘words’?

Find the number of ways of seating 10 people around a table if three people are to sit together. The answer is 4320, but i got 30240. I did: Let the 3 people be one group. Therefore, there are 8 groups. Total arrangements of groups x arranging the 3 people in the one group (8-1)! x 3...

oh oops, i copied the wrong answer. Yes, that was the answer. So just to confirm: t_v is the time measured by the train traveller because they are moving relative to the platform? And t_o is the observed time by the yawner because this is the rest frame where the yawn actually occurs? Thanks a...

I'm confused with the working out in the Jacaranda textbook for this question: If the person standing on the platform yawned just as the train was passing through, and this yawn lasted 2.000 as measured by the yawner, what would be the duration of the yawn as measured by the train...

Thank you very much :D

I have no idea how to do the two of these questions D: Any help is appreciated! 26) During the seven games of the football season, Max and Bert each miss three consecutive games. The games to be missed by each player are randomly and independently selected. a) What is the probability that...

Thanks!

This is from exercise 10H, in the Cambridge textbook. From a standard pack of 52 cards, three are selected at random. Find the probability that: they are from the same suit the answer is 22/425. I understand how to do it the 2 unit way (52/52 * 12/51 * 11/50) but i don't know how to work it...

Thanks :)