POINTS + BRAINLIEST TO CORRECT ANSWER

Physics

1 answer:

Elza [17]1 year ago

4 0

Answer:

Explanation:

The standard film size for one popular camera was 79 mm square.

The film was 116 mm behind the lens.

If you wanted a picture of your 1.8-m-tall friend to fill half the frame,

find:

how far away from you did she need to stand?

solution:

the other person called friend is 1.8 m tall (1,800mm) stood from the other side to fill up half of the frame of 79mm / 2 = 35 mm.

where the film behind the lens is 116mm as given.

so its a ratio and proportion:

1800 mm = 39.5 mm

x 116 mm

39.5 (x) = 1800 (116)

x = 208,800

39.5

x = 5286 mm * 1 m

1000 mm

x = 5.3 m

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A machine produces photo detectors in pairs. Tests show that the first photo detector is acceptable with probability 3/5. When t

klasskru [66]

Answer:

a. $a. \ \frac{7}{25}$

$b.\ \ \ P(D_1D_2)=\frac{6}{25}$

Explanation:

a. Find the probability that exactly one photo detector of a pair is acceptable:

Let $A_i=i^{th}$ photo is accepted and the probability $D_i=i^{th}$ is defected.

Therefore:

$P(A_i)=3/5,\ P(A_2|A_1)=4/5,\ \ P(A_2|D_1)=2/5\\\\\\=P(A_1D_2)+P(D_1A_2)\\\\=\frac{3}{5}\times\frac{1}{5}+\frac{2}{5}\times\frac{2}{5}\\\\=\frac{7}{25}$