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re: HSC Physics Marathon Archive Classical theory predicted that as the wavelength of radiation emitted by a black body decreased, the intensity increased to infinity. However, this violated the law of conservation of energy. The quantum theory was then proposed by Planck as a 'mathematical...

re: HSC Physics Marathon Archive F = qvBsin(theta) F = -1.602 x 10^-19 x 0.1 x 3 x 10^8 x 50 x 10^-6 x sin45 F = 1.70 x 10^-16 N into the page F = mg F = 9.8 x 9.11 x 10^-31 F = 8.93 x 10^-30 N down both the magnetic and gravitational force are vector quantities differences: force due to the...

re: HSC Physics Marathon Archive Einstein: pacifist, promoted world peace - gave lectures around the world, when he moved to America he sent a letter to the US president convincing the gov't to start the Manhattan project --> this later led to the death of thousands of Japanese , he later...

magnetic flux density = magnetic field strength, so it should be measured in Tesla magnetic flux = BA, so shouldn't it be tesla metre square

I got D but the answer is C. I thought that the resistance to the eddy currents generates heat. Can someone please explain?

Carbonic acid (H2CO3) is diprotic though. H2CO3 <--> 2H(+) + CO3(2-). So shouldn't you double the [H+]? i.e. [H+] = 0.08 x 0.1 x 2

Calculate the pH of a 0.1 M soln of carbonic acid if only 8% ionises. I keep getting pH = 1.8 but the answer is pH = 2.1 (they didn't double the hydrogen ion concentration). Is the answer wrong or are you not meant to double the hydrogen ion concentration?

I'm also interested. Could you please PM me your email? Thanks

What is a raw weighted mark? When BOS calculates your mark for a subject, do they use the 'raw mark' or 'raw weighted mark'?

Isn't 18 C?

(3,2)?

Is the answer $2533.11?

Isn't the answer y^2 = -8x + 32

use sine rule to work out angle ADC and then use angle sum of triangle

C) 2 solutions

A window frame has the shape of a rectangle surmounted by a semicircle. The perimeter of the frame is constant. Show that, for maximum area, the height of the rectangle is equal to the radius of the semicircle. Thanks!

if\:%20\int_{-1}^{a}x\:%20dx%20=%200,%20evaluate\:%20a The answer in the book is a = 1. Why isn't the answer a = 1 OR -1?

A traveller employs a man to drive him from Sydney to Wollongong for an hourly payment of P dollars. Running costs of the car, which are also paid by the traveller, are kv3 dollars per hour, where v km/h is the speed, and k is a constant. Find the uniform speed that will minimise the total cost...

^is my final answer still correct though? Also, the uv' was in the 5th not 4th line

Thanks