**Answer:**

The electrical power is 96.5 W/m^2

**Explanation:**

The energy balance is:

Ein-Eout=0

if:

Gsky=oTsky^4

Eb=oTs^4

qc=h(Ts-Tα)

if Gl≈El(l,5800)

lt= 2*5800=11600 um-K, at this value, F=0.941

The hemispherical emissivity is equal to:

lt=2*333=666 K, at this value, F=0

The hemispherical absorptivity is equal to:

**Answer:**

** Outside temperature =88.03°C**

**Explanation:**

Conductivity of air-soil from standard table

K=0.60 W/m-k

To find temperature we need to balance energy

Heat generation=Heat dissipation

Now find the value

We know that for sphere

Given that q=500 W

so

By solving that equation we get

=88.03°C

**So outside temperature =88.03°C**

**Given :**

Force, .

Force is acting at point A( 2 m, 3 m ) and B( 3 m, 5 m )

**To Find :**

The work done by force F .

**Solution :**

Displacement vector between point A and B is :

Now, we know work done is given by :

W = 12000 J

**Therefore, work done by force is 12000 J .**