traveling at about 30 mph, how many feet will the average driver cover from the time they see the danger until they hit the brakes

The dissociation energy of a molecule is the energy required tobreak apart the molecule into its separate atoms. the dissociationenergy for a particular molecule is 5.48 x 10-18 j.suppose that this energy is provided by a single photon. determinethe (a) wavelength and (b) frequency of the photon

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

What is the coefficient of kinetic friction μk between the block and the tabletop?