Evaluate 2p^2-q^2+r^2.if the upthrust on a floating body is expressed in the form M^pL^qT^r

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.

Diverging mirrors and lenses always produce images

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.