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2 years ago

5

The radius of a Circular racetrack is 50 m. if the race car can complete one lap in 20 seconds what is the speed of the race car

1 answer:

jonny [76]2 years ago

8 0

Answer:

15.71 m/s

Explanation:

circumference of the racetrack = 2πr

= 2πx50

= 314.16m

the circumference becomes the distance

speed= distance/time

= 314.14/20

= 15.71 m/s

kindly mark Brainiest

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Estimate the electric field at a point 2.40 cm perpendicular to the midpoint of a uniformly charged 2.00-m-long thin wire carryi

nadya68 [22]

Answer:

$E = 1.85*10^{12}\frac{N}{C}$

Explanation:

Hi!

The perpendicular distance 2.4cm, is much less than the distance to both endpoints of the wire, which is aprox 1m. Then the edge effect is negligible at this field point, and we can aproximate the wire as infinitely long.

The electric filed of an infinitely long wire is easy to calculate. Let's call z the axis along the wire. Because of its simmetry (translational and rotational), the electric field E must point in the radial direction, and it cannot depende on coordinate z. To calculate the field Gauss law is used, as seen in the image, with a cylindrical gaussian surface. The result is:

$E = \frac{\lambda}{2\pi \epsilon_0 r}\\\lambda=\text{charge per unit length}=\frac{4.95 \mu C}{2 m} = 2.475 \frac{C}{m}\\r=\text{perpendicular distance to wire}\\\epsilon_0=8.85*10^{-12}\frac{C^2}{Nm^2}$

Then the electric field at the point of interest is estimated as:

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4 years ago

You are a member of an alpine rescue team and must get a box of supplies, with mass 3.00 kg , up an incline of constant slope an

Sever21 [200]

Answer:

v = 8.45 m/s

Explanation:

given,

mass = 3 kg

angle = 30.0°

vertical distance = 3.3 m

μ = 0.06

according to conservation of energy

KE(loss) = PE(gain) + Work done (against\ friction)..............(1)

frictional Force

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$F_f = \mu m g cos \theta$

work against friction

W = F d

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Potential energy

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$\dfrac{1}{2}mv^2= \dfrac{\mu mgh}{tan \theta}+ mgh$

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v = 8.45 m/s

the minimum speed is equal to 8.45 m/s

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3 years ago