When walking in the classroom I stubbed my toe on a desk. My toe accelerates at +5 m/s/s. My toe has a mass of 0.005 kg and the desk has a
mass of 25 kg. What is the acceleration if the desk?

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters