Which statement describes gravity? check all that apply.
1. there is no defined unit of measurement for gravity.
2. gravity is the force that pulls objects toward earth’s center.
3. objects that have a small mass will have no gravitational pull.
4. gravitational pull between two objects increases as the mass of one increases.
5. gravitational pull decreases when the distance between two objects increases.

resonant frequency

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

snell's law

refractve index = sin incidence / sin refraction