Which statement describes an endothermic reaction? *"Endo" mean ENTER or take in,

(01.02 mc) nicole pushes her bike up a hill. overhead, the sun exerts a gravitational force on earth. which statement is true about the bike and earth? they both experience contact forces. they both experience non-contact forces. the bike experiences a non-contact force and earth experiences a contact force. the bike experiences a contact force and earth experiences a non-contact force. they both experience non-contact forces.

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

During the past 150 years in the united states, how did energy consumption compare to population growth