Planet a takes 1 year to go around its star at an average of 1 a. u. distance. planet b is 4 a. u. from the star. calculate how long planet b takes to orbit.

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?