Which element has the same number of valence electrons as a krypton

(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.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.