Answer:
A = l×b
Explanation:
Rectangle is a closed figure with 4 vertices. Each angle of a rectangle is 90 degrees. The opposite sides of a rectangle are equal.
Let l is the length of opposite sides of a rectangle and b is the breadth of the opposite sides of a rectangle.
The area of a rectangle is then given by :
A = l×b
i.e. area of a rectangle is equal to length times breadth.
C. The object accelerated for 50 seconds and then began to slow down. Hope it helps.
Answer:
The activity of 50mg of Sr is
Explanation:
Every nuclear disintegration follows the first order rate, thus the half-life (t1/2) is where k is the constant of the reaction.
<em>Considering 1 year equals 3.15x107 seconds</em>
For Sr with t1/2 = , the constant of the reaction is
The activity (A) of a nucleus is where N is the number of nucleus. Sr molecular mass is 87.6g/mol and every mol contains 6.023x1023 atoms, thus
Therefore, the activity of 50mg of Sr is
True because they are organically made without any things that include chemicals