3 Fig. 3.1 shows a model of a wind turbine used to demonstrate the use of wind energy to generate
electricity. The wind is blowing towards the model, as shown.
turbine blades
circular area swept out
by turbine blades
wind
Fig. 3.1
(a) The mass of air passing through the circular area swept out by the turbine blades each
second is 7.5kg. The kinetic energy of the air that passes through this circular area cach
second is 240J.
() Calculate the speed of the alr.
spoed
131
(11) The kinetic energy of the air drives a generator. State the input power of the air passing
through the turbine blades.

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

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

Did the proton move into a region of higher potential or lower potential? did the proton move into a region of higher potential or lower potential? because the proton is a negative charge and it accelerates as it travels, it must be moving from a region of higher potential to a region of lower potential. because the proton is a negative charge and it accelerates as it travels, it must be moving from a region of lower potential to a region of higher potential. because the proton is a positive charge and it slows down as it travels, it must be moving from a region of higher potential to a region of lower potential. because the proton is a positive charge and it slows down as it travels, it must be moving from a region of lower potential to a region of higher potential. request answerpart bwhat was the potential difference that stopped the proton? express your answer with the appropriate units.î”v î” v = nothingnothingrequest answerpart cwhat was the initial kinetic energy of the proton, in electron volts? express your answer in electron volts. ki k i = nothing ev request answerprovide feedback