Suppose a vacuum cleaner uses 120 j  of electrical energy. if 45 j are used to pull air into the vacuum cleaner, how efficient is the vacuum cleaner?

What is the radius of the circular path ofa charged particle in a magnetic field?

What properties of a moving object are used in determining the object's energy of motion

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.