(a) 25lx
(b) 11.11lx
<u>Explanation:</u>
Illuminance is inversely proportional to the square of the distance.
So,

where, k is a constant
So,
(a)
If I = 100lx and r₂ = 2r Then,

Dividing both the equation we get

When the distance is doubled then the illumination reduces by one- fourth and becomes 25lx
(b)
If I = 100lx and r₂ = 3r Then,

Dividing equation 1 and 3 we get

When the distance is tripled then the illumination reduces by one- ninth and becomes 11.11lx
40.64 cm is the answer to your question.
Use newtons second law F=ma, plug in the given values which gives us the answer of 22 kg for the mass
Velocity, direction, or both at the same time.
Answer:
yes
Explanation:
pangea moved dinosouars and other spices all aroud the world. just like how you can find the same types of birds in some places with very few differsencs