Alda is making a list of events that cause an eclipse. Which of the following would she need to exclude from that list? OA Earth is positioned directly between the Sun and the Moon.
OB. Earth is positioned closest to the Sun.
OC. The Moon is positioned directly between Earth and the Sun.
OD. Earth passes into the shadow of the Moon.

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

Explain why electric current cannot exist if a current doesn't have a voltage source.

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 = ?