Calcular el area de la base de un bloque de 20 kg que se apoya en el suelo sobre su cara de 30 cm × 10 cm

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

The least penetrating form of radiation is

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.)