Sounds of explosions taking place on other planets is not heard by a person on the earth. give reason

What is the magnitude of the resultant vector round your answer to the nearest tenth

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion