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Thanks for the valuable resource! Keep up the good work.

My teachers are adamant about doing integrated paragraphs relating both texts to an idea/theme etc. What do you think of this?

This is for the 2018 HSC

A projectile fired at a speed of u and an angle of x to the horizontal, reaches a maximum height of H. When the same projectile is fired again at the same angle with a new higher initial speed it reaches a new maximum height of 2H. What is the new initial velocity in terms of u.

That's exactly what i did but answer was different. I'm guessing the answer provided is incorrect then.

Find the net force acting on the Moon from the Earth and the Sun assuming that they are at right angles to each other. Mass of moon = 7.35 x 10^22 kg Mass of sun = 1.99 x 10^30 kg Radius of moon-earth = 3.84x10^5 km radius of moon-sun = 1.5x10^8 km Answer is 4.77x10^20 N at 24.6 degrees

Thanks

I am able to solve the questions involving ratios, such as; Two moons have masses M and 4m and radii R and 4R respectively. Compare their acceleration due to gravity. How best should I set out my working for these? Thanks

Thanks, that's what I thought however, the solution just used a=F/m so must have been incorrect.

A rocket of mass 2000 tonnes, produces a constant thrust of 8x10^7N during liftoff by expelling 1500kg of exhaust gas per second. Calculate the net force acting on an 85kg astronaut 30s after liftoff.

So when a rocket is launched; a=T-mg/m You sub in g=+9.8ms^-2 However, when the rocket is returning to earth, do you still use +9.8ms^-2 or -9.8ms^-2? Thanks.

Yeah thanks, I forgot to square the radius when doing it. :lol:

Would yo recommend it?

What is the force (N) required to get a space craft of mass 1000kg into orbit at 3000km above the earth's surface? Assume the radius of the earth is 6370km.

To place a satellite of mass 10 000 kg in orbit around the Earth, 5.73 x 10^11 J of work is done. Calculate how far from the Eath's surface the satellite is placed in its oribtal path

Does anyone have some harder physics questions on: Gravity and potential energy Escape velocity Projectile motion Kepler's law of periods Law of conservation of momentum

Ah cool, someone alese who wants to do actuarial sutdies

^

Re: Why is HCl added to the fertiliser when finding the % of sulphate in lawn fertili If I were to write a net ionic equation for the addition of HCL to the fertiliser, would this be correct? http://prntscr.com/hbm5yo