Kristen decides to go sledding with her sister Mary after a huge snowstorm. Kristen has a mass of 50kg and Mary has a mass of 57.5kg.
Both sisters take turns, pushing each other down the large hill. The free
diagram shows the forces acting on the sled. If the sled has a mass of
5kg, and each sister rides the sled with the same forces, what is the rate
of acceleration for both Kristin and Mary?

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c. m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?

How many electrons does each element require in its valence shell to become stable?