Answer:
The total number of significant figures is twelve.
Explanation:
Answer:
The rate of change of the shadow length of a person is 2.692 ft/s
Solution:
As per the question:
Height of a person, H = 20 ft
Height of a person, h = 7 ft
Rate = 5 ft/s
Now,
From Fig.1:
b = person's distance from the lamp post
a = shadow length
Also, from the similarity of the triangles, we can write:

Differentiating the above eqn w.r.t t:
Now, we know that:
Rate = 
Thus
Answer with Explanation:
We are given that
String makes an angle w.r.t vertical=
a.We have to derive an expression for the magnitude of the acceleration of the van in terms of the angle
and magnitude g of the acceleration due to gravity.
According to newton's second law





b.


c.Velocity=Constant
We have to find the angle 




