If an electrically neutral atom has 4 protons and 4 neutrons and it gains 2 neutrons what is its electrical charge

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?

The junction rule describes the conservation of which quantity? note that this rule applies only to circuits that are in a steady state.

Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2 . how much is the spring compressed x from its natural length?