The diagram below shows a container filled with water. The three holes in the side of the container are sealed with rubber stoppers. The water exerts a pressure of 3000 Pa on the bottom of the container. The cross-sectional area of the bottom of the container is 0.009 m². a) What is the pressure exerted by the water on the middle rubber stopper, if we assume it is exactly half way down the column of water. Give your answer as a number, units are not required.

b) Describe the energy transfer that takes place when the rubber stopper at the bottom of the container is removed.

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

Which of the following is not am example of a polymer? protein nylon kevlar concreta

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?