The helicopter in the drawing is moving horizontally to the right at a constant velocity. the weight of the helicopter is w=42500 n. the lift force l generated by the rotating blade makes an angle of 21.0° with respect to the vertical. (a) what is the magnitude of the lift force? (b) determine the magnitude of the air resistance r that opposes the motion.

In what direction does the medium move relative to the direction of the wave? explain.

Transfer chemicals from one location to another to weather objects. a-water b-physical weathering c-chemical weathering

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