Cho con lăn c không trượt có bán kính r, thanh truyền AB =2R, tay quay oa =4R
Tính vận tốc góc thanh Ab

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

the doppler effect is used by weather forecasters to measure 

moving clouds