Technician A says that an anti-lock braking system pressure tester depresses the proportioning valve on some anti-lock braking systems while bleeding the brakes. Technician B says that the anti-lock braking system proportioning valve depressor allows the technician to test any pressure issue with the hydraulic control unit. Who is correct?

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?