A body weights 450 N on the surface of Earth . How much will it weigh on the surface of a planet whose masss is 1/9th mass of Earth and radius is half of radius of Earth?

The weight of the body on the other planet would be 200 N

Explanation:

Recall that the acceleration of gravity at sea level on Earth is obtained via the general Gravitational force formula when the distance "d" is the radius of the Earth (R):

We are told that the weight of the object on Earth is 450 N, that is:

in this other planet the acceleration of gravity will be different as shown below:

so, its gravity is 4/9 that of the Earth, which now we can use to convert its weight (w) on the planet as 4/9 the weight it has on Earth:

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards