in a lever, an effort of 400N is applied to lift a load of 600N. if the load is at a distance of 20 cm from the fulcrum and effort ia at a distance of 40 cm. calculate the M. A.V. R. and effecting of the lever.​

Uppose we consider the system of the three capacitors as a single "equivalent" capacitor. given the charges of the three individual capacitors calculated in the previous part, find the total charge qtot for this equivalent capacitor. express your answer in terms of v and c.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Convection currents are caused by differences in what two things?