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lutik1710 [3]
3 years ago
15

Two lab partners, Mary and Paul, are both farsighted. Mary has a near point of 68.6 cm from her eyes and Paul has a near point o

f 128 cm from his eyes. Both students wear glasses that correct their vision to a normal near point of 25.0 cm from their eyes, and both wear glasses 1.80 cm from their eyes. In the process of wrapping up their lab work and leaving for their next class, they exchange glasses (Mary leaves with Paul's glasses and Paul leaves with Mary's glasses). When they get to their next class, find the following.
(a) Determine the distance to the closest object that Mary can see clearly (relative to her eyes) while wearing Paul's glasses.
(b) Determine the distance to the closest object that Paul can see clearly (relative to his eyes) while wearing Mary's glasses.
Physics
1 answer:
Misha Larkins [42]3 years ago
8 0

Answer:

a) 27.7 cm  

b) 19.9 cm

Explanation:

for mary  

d1i = 68.6-1.8 = 66.8 cm

d1o = 25-1.8 = 23.2 cm

1/f1 = 1/d1o + 1/d1i

1/f1 = -(1/23.2)-(1/66.8)

f1 = -17.22 cm

for paul

d2o = 25-1.8 = 23.2 cm

d2i = 128-1.8 = 126.2 cm

1/f2= 1/d2o + 1/d2i

1/f2 = -(1/23.2)-(1/126.2)

f2 = -19.6 cm

a)

1/do + 1/d1i = 1/f2

1/do - (1/66.8) = -1/19.6

do = 27.7 cm  

part b)

1/do + 1/d2i = 1/f1

1/do - (1/126.2) = -(1/17.22)

do = 19.9 cm

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3 years ago
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Heat is transferred from the body with higher temperature to the one with lower tempertature, this is so that in time they end up being at the same temperature.

This means that the one with lower temperature is the one who absorbs the heat, and the one with higher temperature transfer it.

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3 years ago
Read 2 more answers
A string with a mass density of 3 * 10^-3 kg/m is under a tension of 380 N and is fixed at both ends. One of its resonance frequ
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Answer:

(a) the fundamental frequency of this string is 65 Hz

(b) the harmonics of the given frequencies are third and fourth respectively.

(c) the length of the string is 2.74 m

Explanation:

Given;

mass density of the string, μ = 3 x 10⁻³ kg/m

tension of the string, T = 380 N

resonating frequencies, 195 Hz and 260 N

For the given resonant frequencies;

195 = \frac{n}{2l} \sqrt{\frac{T}{\mu} } ---(1)\\\\260 = \frac{n+1}{2l} \sqrt{\frac{T}{\mu} } ---(2)\\\\divide \ (2) \ by (1)\\\\\frac{260}{195} = \frac{n+1 }{n} \\\\260n = 195(n+1)\\\\260 n = 195 n + 195\\\\260n - 195n = 195\\\\65n = 195\\\\n = \frac{195}{65} \\\\n = 3

(c) From any of the equations, solve for Length of the string (L);

195 = \frac{n}{2l} \sqrt{\frac{T}{\mu} } \\\\195 = \frac{3}{2l}\sqrt{\frac{380}{3\times 10^{-3}} } \\\\l = \frac{3}{2\times 195}\sqrt{\frac{380}{3\times 10^{-3}} }\\\\l = 2.74 \ m

(a) the fundamental frequency is calculated as;

f_o = \frac{1}{2l} \sqrt{\frac{T}{\mu} } \\\\f_o = \frac{1}{2\times 2.74} \sqrt{\frac{380}{3\times 10^{-3} } }\\\\f_o =  65 \ Hz

(b) harmonics of the given frequencies;

the first harmonic (n = 1) = f₀ = 65 Hz

the second harmonic (n = 2) = 2f₀ = 130 Hz

the third harmonic (n = 3) = 3f₀ = 195 Hz

the fourth harmonic (n = 4) = 4f₀ = 260 Hz

Thus, the harmonics of the given frequencies are third and fourth respectively.

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2 years ago
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Dima020 [189]

Explanation:

It is given that,

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f=\dfrac{1}{2l}\sqrt{\dfrac{Tl}{m}}

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m'=\dfrac{T}{g}

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m' = 52.89 kg

So, the mass of the anvil is 52.89 kg. Hence, this is the required solution.

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3 years ago
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