Two metal rods in a factory are oppositely charged and placed 8.9 cm apart. One rod has a charge of +7.5 x 10^-7 C and the other has a charge of -5.1 x
10^-5 C. What is the force between the rods?

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.

It really doesn't matter for any of the questions that you've listed.

The density of the block of iron is lees than the density of mercury but the density of the block of iron is greater than the density of water

D=m/v m=d*vd=densitym=massv=volumed(ether)=0.71 gr/cm³=0.71 gr/ mlv=130 mlm=d*vm=0.71 gr/ml*(130 ml)=92.3 gm=92.3 g