Answer:
A. 63765N
B 53955N
Step-by-step explanation:
Going by the picture attached from an online source,
we know from the principle of moments that the sum of upward forces must be equal to the sum of downward forces
also
the sum of clockwise moments must be equal to the sum of anticlockwise moments. For an equilibrium system
the car has a mass of 2000 kg'
the bridge has a mass of 10000 kg,
10000+2000=B+A
12000=B+A.............................1
taking moments at A
20*10000+10*2000=B*40
220000=40B
B=5500kg
from equation 1
12000=5500+A
A=6500 kg
Force is the product of the mass of abody and acceleration due to gravity-F=mg
g=9.81m/s^2
therefore the forces exerted by A
6500*9.81
63765N
The force exerted by B beam on the bridge
f=mg
F=5500*9.81
53955N