Which group 2a element has the largest ionic radius? magnesium calcium barium radium

Which statement correctly describes the relationship between frequency and wavelength?

Which of the following is not am example of a polymer? protein nylon kevlar concreta

(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.