Which has more momentum, a 0.5kg toy car moving a 5 m/s or a 1000kg real car that is parked? Explain why.

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Select the three ways that the parallel-plate capacitor differs from a car battery.

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?