An element's atomic number is 17. how many protons would an atom of this element have?

A1,700kg car is being used to give a 1,400kg car a push start by exerting a force of 140n the impulse on the smaller car during the 30.0s of contact is +670kg*m/s. what is the impulse of the smaller car on the larger car? -814 kg*m/s 0kg *m/s -670kg*m/s -550kg*m/s

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Ain is , is 's of ? 0.62 0.79 1.27 1.50