What is a simple machine? a. any object that makes work easier when a single force is applied by changing the strength or the direction of that force b. any combination of objects that magnifies the input force so that the output force is greater c. any object or group of objects, that when connected to a source of electricity, make work easier d. any object, that when connected to a fossil fuel source, makes work easier

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

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.)

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?