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why is the kinetic energy of an object an infinite distance away from earth 0?

Calculate the orbital period of Deimos, one of the two moons of Mars. Its average distance from mars is 23 400 km and its irregular shape averages about 13 km across. The mass of Mars is 6.42 x 10^23 kg, and its diameter is 6794 km. Full working please. Thanks!

How you do you know when ay is negative or positive 9.8.

can someone give me some ideas for what to write about for last year's HSC question: an inherent tension between confrontation and resolution is revealed through characterization in SHakespeare's Hamlet. To what extent does your interpretation of Hamlet align with this view. I'm a little...

is it possible to have accurate and unreliable results?

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

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?

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

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...

Differentiate y = a(x+b)2 - 8, then find a and b if the parabola has tangent y=2x at the point P(4,8). Full working please. Thanks!

Expand and simplify square root of {(a-5)(a+5)+25}. The answer says 'a' but why isn't the answer the absolute value of a?

How do you simplify: 1) sin(270-theta) 2) cos(90+theta) 3) tan(theta-180) Full working please. Thank You!

Does anybody know where I can find some good dot point notes for physics online (theory + pracs)? I've already searched through the resources section.

What does it mean by 'nature' and 'spatial patterns' exactly? For example, if there was a question that says: describe the nature of a global economic activity (viticulture and winemaking), exactly what kind of things would you have to include?

Differentiate y = a(x+b)2 - 8, then find 'a' and 'b' if the parabola: passes through the origin with gradient 16 has tangent y=2x at the point P (4,8) Thanks!

Find the equation of the two lines which contain the point (1,3) and are tangents to the parabola y = x2​-2x+3

Can someone explain what dynamic equilibrium means in terms of ecosystems.

What are some features or characteristics of journeys?