The current definition of the standard kilogram of mass is based ona) the mass of the earth. b) the mass of the sun. c) the mass a particular object kept in france. d) the mass of a cesium-133 atom.

An ambulance emits a frequency of 450 hz from its siren. what frequency is heard by a man as the ambulance moves toward him? less than 450 hz more than 450 hz 450 hz 0 hz

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

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.