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heres another easy one: THe moon is a satellite of the Earth. Use its period (24 hours) and the mass (5.98 x 10^24) of the earth to calculate the distance from earth centre to la lune.

Re: ppl who got >90 in subjects how did u study?!?! im interested to know as well

for question 1 i used f=mv^2/r but what is the r? I think the question meant 25m as the diameter of the end of a wire, therefore radius is 12.5m?

im just doing questions from sheets my teacher gave out. heres another one: state the simple relationship between satelltile altitude, orbital speed and period. i cant figure out which formula they are referring to.

that looks right, if frictional force is less than required = skid, if > frictional force, no skid. lol I was brain dead

Ok I see, thanks

Thanks

1. A model aircraft of mass 400g moves at 15m/s on the end of a wire of length 25m. Calculate the tension in the wire. 2. A car of mass 1000kg attempts to take a 50m radius curve at 10m/s. a) What is the necessary friction force by the road on the tyres to deliver the required centripetal...

One of the consequences of relativity theory is that space is curved. How can this be so?

Two distant quasars A and B are on opposite sides of the earth and are moving away from us at 0.9c where c is the speed of light. At what speed will light from Quasar B hit: a) earth b) Quasar A Justify your answer. Please help, I do not get what this question is asking at all.

so nothing is with constant velocity unless it is actually stated? I dont quite get d) wouldnt the ball only go forward when the car is reversing, not slowing down? I think the car may be slowing down, but it is still going in a forward motion. please correct me if im wrong Thanks btw

These are some frames of reference. Each contains a ball which is dropped from the ceiling of the frame. Classify each as an inertial or a non inertial frame of reference and describe the motion of the ball when allowed to drop: a) earth car moving forward with constant velocity b) earth lift...

ah k, so everyones at campus except students studying medicine.

:hammer: EDIT: when does uni start FOR unsw students

Which brand do you have? I was also wondering if its worth it to buy a 8gb one just for school work?

hey, according to an online calorie calculator, for someone my age, height, weight they will need to consume 2400 calories a day. what happens if i dont? it says i need 2400 calories to maintain my weight

hahah lucky its not compulsory for us to go

is there a limit to the amount of calories you can burn off each day?

where are you located?

hmm... is it possible to gain weight after working out? Last night I skipped for 1 hour and did 50 push ups + 50 sit ups. Muscles are heavier than fat, right?