14.0 m uniform ladder weighing 490 n rests against a frictionless wall. the ladder makes a 65.0°-angle with the horizontal. (a) find the horizontal and vertical forces (in n) the ground exerts on the base of the ladder when an 850-n firefighter has climbed 4.10 m along the ladder from the bottom. horizontal

The horizontal reaction force is 230.3 N.

Explanation:

Given that,

Length l= 14.0 m

Weight of ladder F = 490 N

Angle = 65°

Weight of firefighter F'= 850 N

Height l'= 4.10 m

Suppose horizontal force magnitude N direction vertical force magnitude N direction

We need to calculate the horizontal reaction force

Horizontal reaction force = normal reaction from wall

Vertical reaction force = weight of ladder +weight of man

We need to calculate the moment about bottom is zero

Put the value in the equation

Hence, The horizontal reaction force is 230.3 N.

12000j is work done

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j