A black, totally absorbing piece of cardboard of area a = 2.1 cm2 intercepts light with an intensity of 8.8 w/m2 from a camera strobe light. what radiation pressure is produced on the cardboard by the light?

The value of radiation pressure is Pa

Explanation:

Given:

Intensity

Area of piece

From the formula of radiation pressure in terms of intensity,

Where radiation pressure, speed of light

We know value of speed of light,

Put all values in above equation,

  Pa

Therefore, the value of radiation pressure is Pa

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form

490 n

f=125n a=2.5m/s2