A 50kg person standing still in ice skates throws their helmet to the right at 25 m/s while on a frictionless surface. This gives the person a speed of 1.0m/s leftwards. What is the mass of the helmet? Consider rightward as the positive direction.

Why do electron microscopes have higher resolving power than light microscopes?

You will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. (refer to the walk-through video to locate the online lab within the online textbook).

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)