The efficiency of a propeller np for the range of advance ratios j between 0 and 2 is 400j2 given by the relation 77,r, (j; β) = (b-10j)/(1+14bj), or 15 b s55 where β is the propeller pitch angle in degrees and j-vo/nd is the advance ratio a) plot sufficient number of efficiency curves and find the maximum efficiency graphically and estimate the range advance ratios j for which the efficiency is b) find the relation between the advance ratio, j, and pitch angle, β, that maximizes c) calculate the advance ratio that yields max efficiency when pitch angle is 35 d) calculate the pitch angles {1/max, β(j2)} and {una , β(j-25)} for which the propeller greater than 0.7 when 150 β 450 the propeller efficiency deg. and the corr efficiency is maximum (仞max, β(j-2) denotes the pitch angle for j-2 that yields a esponding max efficiency maximum efficiency) and the corresponding max efficiencies.

hey , the answer is c

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.