question 7?

Question

using Newton's Law of universal gravation find the force of gravity of the planet venus

Answer 1

the law says:
the force between any 2 bodies is given by:
F = G(m1*m2)/r^2
F is Force
G is universal contant of gravitation
m1 and m2 are mass of the bodies.
r is the distance between the 2 bodies

Answer 2

It depends on what information you are given. Ultimately, F = GMm/r^2, where G is the gravitational constant, M is the mass of the planet, m is the mass of the object, and r^2 is the distance between their respective centers of mass; we assume that r is equal to the radius of the planet Venus, because the size of the object is negligible relative to that of the planet. G is equal to 6.67 x 10^-11 N-m^2/kg^2.

The question is not phrased properly, because there is no constant force at the surface of a planet. Rather, there is a constant acceleration, while the force is proportional to the mass of the object. To find just the acceleration at the surface, it's a = GM/r^2. If you are supposed use M and r directly, the values I found were M = 4.87 x 10^24 kg and r = 6051900 m. But if you're supposed to find the mass in a different way, such as by assuming it has the same density as the Earth, then you'll need to do that first. The actual acceleration due to gravity on Venus is 8.87 m/s^2, so you can use that to check your answer.

Answer 3

Hey, Newton, I'll give you this nifty telescope if you tell me wha tthe gravity on Venus is.

OK....

Equatorial radius: 6,051.9 km
(0.95 Earths)
Mass: 4.8685×1024 kg
(0.815 Earths)
Mean density: 5.204 g/cm³
Equatorial surface gravity: 8.87 m/s2
(0.904 g)