A(n) 7.6 g object moving to the right at 20 cm/s makes an elastic head-on collision with a 23 g object moving in the opposite direction at 45 cm/is. 7.6 g 20 cm/s 23 g 45 cm/s Find the velocity of the first object immediately after the collision. Answer in units of cm/s.

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Which of these statements best explains how the hydrosphere interacts with the atmosphere to affect global climate? mountains block rain clouds and cause changes in global rainfall and evaporation. humans burn fossil fuels to produce greenhouse gases which cause global warming. humans cut down trees which affects the amount of oxygen in different parts of the globe. greenhouse gases, like carbon dioxide, dissolve in oceans and prevent global warming.

Frequency of electromagnetic waves that a radio station is assigned. what do you call this type of wave?