Answer: The answer is option B
Explanation:
The base of the pyramid represents primary producers since they help to pass on energy to consumers as we go higher in the pyramid. They are not consumers because they supply energy and do not use up energy. They are called autotrophs.
I think ....... the answer will be ......
like a theory
Answer:
the maximum shear stress in the bar = 9.55 MPa
the twisting angle = 
Explanation:
From the diagram below;
Torque (T) = 2 kN × 5 mm + 2 kN × 5 mm
= 
= 200 N.m
Now; If we divide the shaft into two parts AC & BC
Then :
------------ equation (1)
At the junction :


⇒ 


replace
into above equation (1)

Again:

Now ; we can deduce that the maximum shear comes from
since 
So;

where;
R = 20 mm
D = 40 mm = 0.04 m
Then;


Thus ; the maximum shear stress in the bar = 9.55 MPa
b)
Again: 



Thus, the twisting angle = 
Answer: 11.1cm
Explanation:
Object distance (u) = 32cm
Image distance(v) = 17cm
Focal length(f) =?
Lens formular:
1/f = 1/u + 1/v
1/f = 1/32 + 1/17
Taking the L. C. M of 17 and 32
1/f = (17 + 32) / 544
1/f = 49/544
Taking the reciprocal
f = 544/49
f = 11.1 cm
Therefore, Focal length of the lens is 11.1cm