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bonufazy [111]
2 years ago
10

A 20-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is?

Physics
1 answer:
Irina18 [472]2 years ago
8 0

16-N because 20-4=16

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Answer:

The focal length of the lens must be 27.3cm

Explanation:

Image distance= -75 cm

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From:

1/v + 1/u = 1/f

-1/75+ 1/20 = 1/f

11/300= 1/f

f= 300/11

f= 27.3cm

The focal length of the lens must be 27.3cm

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True

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ape x

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2 years ago
A 5 meter long ladder leans against a wall. The bottom of the ladder slides away from the wall at the constant rate of 1 3 m/s.
Oksana_A [137]

Answer:9.75 m/s

Explanation:

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at x=3

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2x\frac{\mathrm{d} x}{\mathrm{d} t}+2y\frac{\mathrm{d} y}{\mathrm{d} t}=0

x\frac{\mathrm{d} x}{\mathrm{d} t}=-y\frac{\mathrm{d} y}{\mathrm{d} t}

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