What is the ratio of the intensities of an earthquake P wave passing through the Earth and detected at two points 14 km and 44 km from the source?

Explanation:

Intensity of a wave is inversely proportional to distance from source

I ∝ 1 / r

I is intensity , r is distance

I₁ / I₂ = r₂² / r₁²

ratio of intensity = 44² / 14²

= 9.87

intensity of earthquake of first place will be 9.87 times that of second place .

chemical properties of thing

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