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madam
6 days ago
12

After an initial race George determines that his car loses 35 percent of its acceleration due to air resistance travelling at 38

m/s on flat ground. Assuming that his car travels with a constant acceleration, calculate the maximum speed (Vm), in meters per second, his car can reach on flat ground?\
Physics
1 answer:
Sav [2.8K]6 days ago
3 0

Answer:

64.2 m/s

Explanation:

Given that

Speed,v=38 m/s

We need to calculate the maximum speed when his car reaches flat ground.

By using dimensional analysis

F_{res}\propto v^2

If a reduction of 35% in acceleration due to F(res) occurs at 38 m/s

Then, a complete 100% reduction in acceleration can be achieved by F(res) at v' m/s

\frac{F_1}{F_2}=\frac{v^2}{v'^2}

v'^2=\frac{F_2}{F_1}v^2

v'=v\sqrt{\frac{F_2}{F_1}}

By substituting the values

v'=38\times \sqrt{\frac{100}{35}}

v'=64.2 m/s

Thus, the maximum speed achievable when his car is on flat ground is 64.2 m/s

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Why didn't the astronauts land on the moon 3.17 answers punchline?
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Two astronauts, A and B, both with mass of 60Kg, are moving along a straight line in the same direction in a weightless spaceshi
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The answer is:

V=14m/s

Details are as follows:

According to the problem, we have

The combined mass of A and B is 60kg

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1 month ago
The angle θ is slowly increased. Write an expression for the angle at which the block begins to move in terms of μs.
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gdzie

mg sin \theta to składowa ciężaru równoległa do nachylenia, przy czym m oznacza masę obiektu, g oznacza przyspieszenie grawitacyjne, a \theta to kąt nachylenia

\mu_s R to siła tarcia, z \mu_s jako współczynnikiem tarcia oraz R jako reakcją normalną nachylenia

Równanie sił w kierunku prostopadłym do nachylenia to

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gdzie

R to reakcja normalna

mg cos \theta to składowa ciężaru prostopadła do nachylenia

Obliczając R,

R=mg cos \theta

I podstawiając do (1)

mg sin \theta - \mu_s mg cos \theta = 0

Rearanżując równanie,

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