Suppose that a steel bridge, 1000 m long, were built without any expansion joints. suppose that only one end of the bridge was held fixed. what would the difference in the length of the bridge be between winter and summer, taking a typical winter temperature as 0°c, and a typical summer temperature as 40°c? the coefficient of thermal expansion of steel is 10.5 × 10-6 k-1.

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

the answer is 12 as i may remember

: )

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