The earth has a radius of 6.38 × 106 m and turns on its axis once every 23.9 h.

(a) what is the tangential speed (in m/s) of a person living in ecuador, a country that lies on the equator?

(b) at what latitude (i. e., the angle theta in the drawing) is the tangential speed one-third that of a person living in ecuador?

Fill in the blank. the number of each type of element in the compound (other than 1) is represented by a small number to the right of the element symbol.

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?