Answer:
a)6.34 x
W/m²
b)1.37 x
W/m²
c) see explanation.
Explanation:
a)The relation of intensity'I' of the radiation and area 'A' is given by:
I= P/A
where P= power of sunlight i.e 3.9 x
J
and the area of the sun is given by,
A= 4π
=> 4π
A=6.15 x
m²
= 3.9 x
/ 6.15 x
=><u> 6.34 x </u>
<u>W/m²</u>
b) First determine the are of the sphere in order to determine intensity at the surface of the virtual space
A= 4π
Now R= 1.5 x
m
A= 4π x 1.5 x
=>2.83 x
m²
The power that each square meter of Earths surface receives
= 3.9 x
/2.83 x
=><u>1.37 x </u>
<u> W/m²</u>
<u />
c) in part (b), by assuming the shape of the wavefront of the light emitted by the Sun is a spherical shape so each point has the same distance from the source i.e sun on the wavefront.
Answer:
1000 N
Explanation:
First, we need to find the deceleration of the running back, which is given by:

where
v = 0 is his final velocity
u = 5 m/s is his initial velocity
t = 0.5 s is the time taken
Substituting, we have

And now we can calculate the force exerted on the running back, by using Newton's second law:

so, the magnitude of the force is 1000 N.
Answer:
r1 -r2 = 3.75cm
Explanation:
Check the attached file for the solution
Answer:
Explanation:
Given
Weight of strut 
Weight of sign Board 
In this question angle which cable makes with horizontal is not given so
assuming 
From Diagram
Moment about hinge point




in x direction is zero


in Y direction is zero therefore




That’s kinda messed up ⬆️