on a planet (whose size is the same and mass 4 times as that of the earth) the energy needed to lift a 2kg mass vertically upwards through 2m distance on the planet is
Answers
Answered by
137
The acceleration due to gravity is given by g=GMR2. So in the other planet the acceleration due to gravity is given by
g'=G4MR2=4GMR2=4g
So energy to lift 2 kg mass to 2 m height is given by
Ep=mg'h=2×4g×2=2×4×10×2=160 J
g'=G4MR2=4GMR2=4g
So energy to lift 2 kg mass to 2 m height is given by
Ep=mg'h=2×4g×2=2×4×10×2=160 J
Answered by
3
Answer:
Here , RP = Re;MP = 4Me
M = 3kg ; h = 3m ; ge =10m/s^−2
On the surface of the earth,
ge = GM/Re^2
On the surface of the planet,
gP = GMp/Rp^2 = (G4Me/Re^2)4(GMe/Re^2 = 4ge
gP = 4 × 10 = 40m/s^2
Work done = mgPh = 3 × 40 × 3 = 360J.
Similar questions