F(G on surface)= (6.67x10^-11 x 77.5 x 5.97x10^24)/((6380x10^3)^2)=758.16N
F(G inside satellite) =(6.67x10^-11 x 77.5 x 5.97x10^24)/((6380x10^3 +685x10^3)^2)=618.27N
ΔF(G)= 618.27-758.16=-139.89N
=138.89N opposite the direction of the center of Earth
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Three moons X, Y and Z are in orbit around the same planet. The moons have identical orbital speeds and masses of M, 9M and 25M respectively. Determine the ratio of their orbital radii and justify your answer.
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The ratio is just 1:1:1 as orbital radii --> identical for all three moons (since the orbital speed and orbital does not depend on the mass).
When Fc = Fg
where Fc = (mv^2)/2 -------- and Fg = (GmMp)/r^2 )where Mp is the mass of the planet)
ending up with r = (GMp)v^2 (masses cancel out so the orbital speed and orbital radii does not depend on the mass) and r is constant in this case
THEREFORE the ratio is 1:1:1
So I'm a bit stumped on how to find the launch speed and angle of launch from the horizontal. I'm given the Horizontal component which is 30 ms^-1 and the vertical component which is 80 ms^-1.
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A golf ball was smashed at 25ms^-1 and at a angle of 40 degrees
a) find the total time it took for the ball to bounce (2 marks)
b) find range (2 marks)
derive the formula T = nBIA cos(theta)
Compare the inertial and non-inertial frame of references. (3)
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I can only think of equating F = nBIL and F = T/d to get nBIL = T/d, T = nBILd (and L*d = Area of rectangle/square) and you just add in the cos theta as the angle between the plane of the coil and the magnetic field... something like that...
I can't make a table on here so I'll just do dot points:
- Inertial frames are non-accelerating while non-inertial frames are accelerating.
- Inertial frames obey Newton's laws of classical mechanics while non-inertial frames do not.
- Inertial frames are accounted for by Einstein's special theory of relativity while non-inertial frames are accounted for by Einstein's general theory of relativity.
- Inertial frames obey Newton's first law and non-inertial frames have fictitious forces to explain motion caused by no net force, e.g. centrifugal force.
Should be enough for 3 marks I think...
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Outline how our understanding of time and space have changed since the publication of the theory of Special Relativity. How is this theory "Special"? (4 Marks)
Q10.PNG
Help please! Thanks in advance!
Its been a while!
CHALLENGE QUESTION
Every millennium Super Thuc and Super Brian fly to planet X to have a rap battle, which is 30 light years from their home planets. Planet Beast and Planet Guan respectively. But Thuc, having perfected his speed, travels at 0.8c whilst Brian only does 0.6c. How much older (or younger) will Thuc be then Brian.
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