Answer:
Step-by-step explanation:
Less than, 40 tons in pounds is 80000.
Answer:
The intensity on a screen 70 ft from the light is 1.728 foot candle.
Step-by-step explanation:
Given that,
The magnitude of intensity
of light varies inversely as the square of the magnitude of distance D from the source.
That is

Then,

Given that,
The magnitude of intensity of illumination on a screen 56 ft from a light is 2.7 foot-candle.
Here,
=2.7 foot-candle,
= 56 ft
=?,
= 70 ft.




foot-candle
The intensity on a screen 70 ft from the light is 1.728 foot candle.
We are given
total number of cars =12
cost of each car = $178
now, we have to find total cost
so, we can use formula
total cost = (total number of cars)* ( cost of each car)
so, we can plug values
and we get


So, the cost of 12 cars is $2136.........Answer