Aflying hawk makes a noise of frequency 50 hz that spreads evenly in every direction. the intensity at the ground, 60 m below, is measured at 70 db. what is the power radiated by the hawk?

The power radiated by the hawk is 0.452 Watt.

Explanation:

Given that,

Frequency = 50 Hz

Distance r=60 m

Level = 70 dB

We need to calculate the intensity

Using formula of intensity

Put the value into the formula

We need to calculate the power radiated by the hawk

Using formula of power

Put the value into the formula

Hence, The power radiated by the hawk is 0.452 Watt.

no sign of dia of fuel cell

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards