Many automobiles passengers have suffered neck injuries when struck by cars from behind. How does newton’s law of inertia apply here? How do headrest help to gauard against this kinda of injury?

Which of these metals are magnetic?

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?

Which of the following is not an appropriate unit for acceleration? (kg/12 mihr? m/min/sec cm/30c?