Aperson weighing 785 newtons on the surface
of earth would weigh 298 newtons on the
surface of mars. what is the magnitude of the
gravitational field strength on the surface of
mars?
(1) 2.63 n/kg (3) 6.09 n/kg
(2) 3.72 n/kg (4) 9.81 n/kg

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

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?

What is the role of the water cycle in maintaining freshwater levels in lake and rivers?