Ben sat outside his school in cambridge and made a note of the colour of the first 100 cars that passed 27 of the cars were red.
2 answers:
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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.
Answer:
1 student
Step-by-step explanation:
From the Vann diagram attached below,
Let x represent the number of students who took 3 subjects.
Therefore,
100 = (42-9-11-x)+11+x+9+10+(35-10-11-x)+(30-9-10-x)+20
100 = 22-x+11+x+9+10+14-x+11-x+20
100 = 97-2x
2x = 100-97
2x = 3
x = 3/2.
x = 1.5
x = 1 student
