1. a 700kg racecar slowed from 30m/s to 15 m/s. what was its change in momentum? 2. if the car in the above problem took 5 seconds to slow down from 30m/s to 15 m/s. a. what is the impulse? b. what was the average force applied by the brakes?

Groups of organs that work together to complete a process in the body are called: a. cells b. tissues c. nerves d. systems

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

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.)