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A satellite in orbit at a distance R from the centre of the earth has a period of 12 hours. What is the period of a satellite orbiting at a distance 3R? ANS: 62 hours. How do you get 62 hours?

Don't need to worry about g being positive or negative so long as you're consistent with the directions. No need to even think about delta y, just plug into equations. What do you mean by "consistent"? Because I always take g as -9.8, so does this mean delta Y is always negative as well? Also...

A projectile is fired horizontally at 10m/s from the top of a cliff, 55m high, into the water. What is the magnitude of its velocity as it impacts the water? A. 32.8m/s B. 1078m/s C. 1175.8m/s D. 34.3m/s If g is -9.8, is delta Y negative too? If not, when is it negative?

Explain how the process of filtration and reabsorption in the nephron of a mammalian kidney regulates body fluid concentration. (4 marks)

Explain using an example how Darwin and Wallace's theory of evolution by natural selection accounts for convergent and divergent evolution. I have my mid term tomorrow so HELP! Thanks! (8 marks)

I don't get them! I know when a current is passed through a coil surrounded by a radial magnet in the galvanometer, a force is experienced by the pointer. But that alone is not a good explanation. I would really appreciate any input on this. Cheers! Treat it like a 5 question mark :p

Can you explain everything in a simpler way? I seriously don't know how you got that equation....

The cost of running a car at an average speed of V km/h is given by C=150+(v2/80) cents per hour. Find the average speed, to the nearest km/h, at which cost of a 500km trip is a minimum. Where do I even start?

1.Planet X has twice the mass and half the radius of Plant Y. What is the ratio of the weight of a 10kg mass on planet X to its weight on planet Y? 2.Michelson and Morley expected to see a shift in an interference pattern in their experiment. They were destined to get always get a null result. Why?

Exactly how do you describe them? How would you answer this dot point if it were a 6-8 mark question(please be as detailed as possible) Outline, using a simple model(what does it mean by model?), the process by which DNA controls the production of polypeptides.Cheers!

Ok thanks

Hi guys, is y=-2x^2 - 5x + 3 a parabola?

I don't understand the answer given... It's not clear enough

How do you work this dotpoint out? -define gravitational potential energy as the work done to move an object from a very large distance away to a point in a gravitational field

So what's the point of C1V1=C2V2? I don't get it.... Is there a special situation where we have to use it?

can't we use C=n/v for both of them? C=n/v can be used once the chemical formula is written out, right?

I've seen C1V1=C2V2 before as well, do you know when to use it?

Is it "C1V1=C2V2" or "C=n/v"?

A household cleaning agent contains a weak base of general formula NaX. 1g of this compound was dissolved in 100ml of water. A 20ml sample of the solution was titrated with 0.1mol/L HCL and required 24.4ml of the acid for neutralisation. What is the molar mass of this base? So I got the...

Yes, but how does that affect the formula? EDIT: OK I get it now! Thanks!