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Why are you using the Torque formula? I don't understand, it's asking for force.

Dot Point 1.5.2 part (c) The diagram shows a horizontal 10cm square loop carrying 1.5 A in a magnetic field of strength 0.25T c) Predict the force on side AC of the loop if it was made into a coil with 50 turns. Side AC is 90 degrees to the magnetic field. I used F=lIB So F = 0.025 x 1.5 x...

Wait I think I know now, its F=ma then you minus 9.8 (from gravity).

I don't think doing f=ma is right since there is another similar question and it has a completely different answer. Dotpoint 2.8: Analyse the changing acceleration of a rocket during launch in terms of Law of Conservation of Momentum and the forces experienced by astronauts.

Well the answer has something different. Can someone clarify if the answers is wrong or not? I have a feeling it has something to do with momentum though.

The answer says its 10.2m/s^2, not 8000/400m/s^2

A rocket has mass 400kg, 75% being fuel. It develops a thrust of 8000N. Calculate its initial acceleration. How do I do this?

But GPE is a negative value so doesn't mean the larger the negative value, the smaller it is?

Ok Thanks! The next Question as well: 1.6.5 a) Three spacecraft having masses m1>m2>m3 are in the same stable orbit around planet X. Compare their gravitational potential energies and justify your answer. Isn't the GPE: m3>m2>m1 but the answers have it the other way around? And god I spent so...

Physics Dot Point 1.6.4 part (b) I don't understand how to do this. Heres the question: Satellite X has its orbit around Earth changed from an altitude of 10,000km to 20,000km. Satellite Y has its orbit around Earth changed from an altitude of 20,000km to 30,000km. Both satellites have a mass...

Oh yeah thanks I differentiated incorrectly lol!

Integration Question How do I do this question??

2.7.3 Calculate the acceleration of a proton on an electric field of strength 4.0 x 10^-5. The charge on a proton is 1.6 x 10^-19 and its mass is 1.67 x 10^-27 I'm not sure how to do this question. Can someone please explain? The answer is 3832 m/s^2

Im not very good at redox reactions and I just wanted to make sure I done these right: Write the half-equations for these and label each as oxidation or reduction: 1. Zn + Cu^2+ --> Zn^2+ + Cu 2. Cl2 + 2I^- ---> I2 + 2CL^- 3. Mg + 2H^+ --> H2 + Mg^2+ Any help would be greatly appreciated.

I get 4.2g as well. The question is wrong I think.

That sounds like a smart idea. Thanks.

Can you give some artist names? :P I get bored of listening to same music over and over again.

Is listening to music while studying a good thing? I usually get a bit into the music too much and get distracted from work so I'm not sure. But anyone got any good recommendations for music? I listen to rock mostly.

Music 1 is sooo easy that you only need about 1-2 hours of study before the exam and that is all. Music 2 is much harder and it has more theory which is boring for me. Hehe I don't want a study group where we meet - just msn.

I have a study group in real life but I feel that most my friends aren't smart enough.