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Bezzdna [24]
3 years ago
10

Formula One racers speed up much more quickly than normal passenger vehicles, and they also can stop in a much shorter distance.

A Formula One racer travelling at 90 m/s can stop in a distance of 110 m.
Physics
1 answer:
Afina-wow [57]3 years ago
7 0

Answer

given,

initial speed of the car = 90 m/s

final speed of the car = 0 m/s

distance taken to stop = 110 m

calculating the acceleration of the car = ?

using the equation of motion

v² - u² = 2 a s

0² - 90² = 2 x a x 100

a = \dfrac{-90^2}{2\times 100}

   a = 40.5 m/s²

acceleration of the formula one car is equal to a = 40.5 m/s²

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The Reynolds number, rho VD/mu, is a very important parameter in fluid mechanics. Verify that the Reynolds number is dimensionle
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Answer:

Re = 1 10⁴

Explanation:

Reynolds number is

         Re = ρ v D /μ

The units of each term are

       ρ = [kg / m³]

       v = [m / s]

      D = [m]

      μ = [Pa s]

The pressure

      Pa = [N / m²] = [Kg m / s²] 1 / [m²] = [kg / m s²]

      μ = [Pa s] = [kg / m s²] [s] = [kg / m s]

We substitute the units in the equation

      Re = [kg / m³] [m / s] [m] / [kg / m s]

      Re = [kg / m s] / [m s / kg]

      RE = [ ]

Reynolds number is a scalar

Let's evaluate for the given point

Where the data for methane are:

viscosity       μ = 11.2 10⁻⁶ Pa s

the density  ρ = 0.656 kg / m³

       D = 2 in (2.54 10⁻² m / 1 in) = 5.08 10⁻² m

       Re = 0.656 4 2 5.08 10⁻² /11.2 10⁻⁶

       Re = 1.19 10⁴

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3 years ago
Which of these has the greatest influence over how big a baby elephant will grow?
lina2011 [118]
Is this a multiple choice question? Or would you just like me to state generally the greatest influence over how big a baby elephant will grow ?
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Which sequence shows the chain of energy transfers that create surface currents on the ocean?
Papessa [141]

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The correct answer is A. The sun is the energy source of the surface currents in the ocean

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When a rattlesnake strikes, its head accelerates from rest to a speed of 32 m/s in 0.63 seconds. Assume for simplicity that the
irina [24]

Answer:

Power, P = 162.53 Watts          

Explanation:

Given that,

Mass, m = 200 g = 0.2 kg

Initial speed of the snake, u = 0

Final speed of the snake, v = 32 m/s

Time, t = 0.63 s

Power of an object is given by :

P=\dfrac{W}{t}

P=\dfrac{\Delta K}{t}

P=\dfrac{mv^2}{2t}

P=\dfrac{0.2\times (32)^2}{2\times 0.63}

P = 162.53 Watts

So, the power of the rattlesnake is 162.53 Watts. Hence, this is the required solution.

4 0
4 years ago
A proton is shot perpendicularly at an infinite plane of charge. The charge density of the plane is +7.65×10^−4 C/m^2. If the pr
Alexeev081 [22]

Answer:

The velocity is 2.94\times10^{6}\ m/s.

Explanation:

Given that,

Charge density of the plane \sigma=7.65\times10^{−4}\ C/m^2

Distance = 1.05 mm

We need to calculate the electric field due to plane of charge

Using formula of electric field

E=\dfrac{\sigma}{2\epsilon}

Put the value into the formula

E=\dfrac{7.65\times10^{−4}}{2\times8.85\times10^{-12}}

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We need to calculate potential difference

Using formula of potential difference

V=E\times r

Put the value into the formula

V=4.322\times10^{7}\times1.05\times10^{-3}

V=4.5381\times10^{4}\ Volt

We need to calculate the work requires to be done to reach the surface of the plane

Using formula of work done

W=qV

Put the value into the formula

W = 1.6\times10^{-19}\times4.5381\times10^{4}

W=7.26096\times10^{-15}\ J

We need to calculate the velocity

Using work energy theorem

W=\dfrac{1}{2}mv^2

v^2=\dfrac{2W}{m}

v=\sqrt{\dfrac{2\times7.26096\times10^{-15}}{1.67\times10^{-27}}}

v=2.94\times10^{6}\ m/s

Hence, The velocity is 2.94\times10^{6}\ m/s.

8 0
3 years ago
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