A sled slides 100 m down a hill that slopes at an angle of 30° with the horizontal direction.
The sled attains a final velocity of 20 m s ' at the
base of the slope. What fraction of the energy was
lost due to friction'!​

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

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?

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?