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faltersainse [42]
3 years ago
11

If you traveled 90 km in 0.50 hours, what was your average speed

Physics
1 answer:
Alinara [238K]3 years ago
8 0

Average speed = distance / time

Average speed = 90 km / 0.5 hrs

Average speed = 180 km per hour

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Two crates, one with mass 5.4 kg and the other with mass 8.2 kg, connected by a light rope. The coefficient of kinetic friction
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Answer:

R= 2.5 :ratio of the magnitude of the applied horizontal force to the magnitude of the tension in the rope connecting the blocks

Explanation:

We apply Newton's second law:

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velocity  is constant ,then , a=0

Nomenclature

W: weight

m: mass

N : normal force

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Force Calculation

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Ff₁= μk* N₁=0.4*52.92 N = 21.16N

Ff₂= μk* N₂=0.4*80.36N = 32.14N

Look at the attached graphic

Free-Body diagram m₁=5.4 kg

∑Fx=0

T- Ff₁=0 , T= Ff₁     ,    T= 21.16N

Free-Body diagram m₂=8.2 kg

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F-T- Ff₂=0 , F=T+Ff₂= 21.16N+32.14N=53.3N

Ratio of the magnitude of the applied horizontal force to the magnitude of the tension in the rope connecting the blocks (R)

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