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IRISSAK [1]
3 years ago
15

Byun walked 15 blocks in 25 minutes. What was his average speed?

Physics
1 answer:
djverab [1.8K]3 years ago
8 0

Answer:

0.3m/s

Explanation:

speed=distance moved by the object/time taken

speed=15/25

speed=0.6

but we are asked to calculate average speed

so speed/2

average speed= 0.6/2

average speed=0.3m/s

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sweet [91]

Answer:

84.196%

Explanation:

g = Acceleration due to gravity = 9.81 m/s²

y_0=1\ m

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y=y_0+ut+\dfrac{1}{2}gt^2\\\Rightarrow 0=y_0-\dfrac{1}{2}gt^2\\\Rightarrow t=\sqrt{\dfrac{2y_0}{g}}\\\Rightarrow t=\sqrt{\dfrac{2\times 1}{9.81}}\\\Rightarrow t=0.45152\ s

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From continuity equation we have

Av=A_0v_0\\\Rightarrow A=\dfrac{A_0v_0}{v}\\\Rightarrow A=\dfrac{\pi 1.5^2\times 3.5}{22.14741}\\\Rightarrow A=1.11706\ cm^2

Fraction is given by

f=\dfrac{A_0-A}{A_0}\times 100\\\Rightarrow f=\dfrac{\pi 1.5^2-1.11706}{\pi 1.5^2}\times 100\\\Rightarrow f=84.196\ \%

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4 0
3 years ago
If a mass of 76 kg acts downward 0.38 m from the axis of rotation on one end of a board and another force of 129 N also acts dow
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m g × x = F x y

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Hence, the length of the moment arm is equal to 2.196 m.

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