We can reasonably model a 75 W incandescent light bulb as a sphere 6.0 cm in diameter. Typically, only about 5 % of the energy goes to visible light: the rest foes largely to nonvisible infrared radiation.(a) What is the visible light intensity (in W/m^2) at the surface of the bulb?(b) What are the amplitudes of the electric and magnetic fields at this surface, for a sinusoidal wave with this intensity?

a

b

And

Explanation:

From the question we are told that  

   The  power is  

   The  diameter is  

Generally the radius is mathematically represented as

=>  

=>  

Generally the area of the sphere is mathematically evaluated as

=>      

=>      

Generally the total  Intensity of the  incandescent light bulb is mathematically represented as

=>    

=>  

Given that 5%  of the energy goes to visible  light

Then the intensity that goes visible light is  

The amplitude of the electric field at the surface is mathematically represented as

=>  

=>    

The amplitude of the magnetic  field at the surface is mathematically represented as

=>    

=>  

b.

explanation:

10.0

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.