Recent content by tuffshorty

but i don't know what the force on the jack is...

The end of the lever of a tire jack travels 7 m for every centimeter that it lifts the car. If the car has a mass of 1000 kg and a force of 50 N is needed to lift the car, what is the efficiency of the jack Efficiency = useful work output/total work input w = F x d, where w is work, F is...

I need to calculate the efficiency of a inclined plane if a 60 pound box is being pushed up it... The inclined plane is 16 feet long (The plane itself, not the base) and it is raised up 4 feet high. Homework Equations efficiency= useful work output/total work input w=fd w= work...

Okay, thank you! Just wanted to make sure i wasn't missing a formula somewhere

The question is... suppose it requires 100 dynes to change the length of a certain spring 5 cm. What force is required to change the length of the spring 20 cm? Would you just multiply it... and say it would take 400 dynes?

5.508 x 10^-27 N is what i got when i plugged it in... and for the acceleration i got 6120 meter/second^2

The electrical charge of the atom?

I suppose I am not sure what you mean.. or what provides it... that is all the question said...

It rotating around the hydrogen atom I think...

Homework Statement The mass of an electron is 9 x 10-31 kg. The mass of a proton is 1.7 x 10-27 kg. The proton and electron are about 1.0 x 10-10 m apart in a hydrogen atom. What force of gravitation exists between the proton and the electron of a hydrogen atom? What is the centripetal...