What is the tangential velocity of a record player which makes 11 revolutions in 20 seconds?

Physics

1 answer:

Vsevolod [243]2 years ago

3 0

What is the tangential velocity of a record player which makes 11 revolutions in 20 seconds? Help hello

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Calculate the refractive index for a substance where the angle of incidence is 300 , the angle of refraction is 600 , and the re

Sophie [7]

Answer:

η₁ = 2.6

Explanation:

Here, we will use snell's law to calculate the refractive of the substance:

$\frac{\eta_2}{\eta_1} = \frac{Sin\theta_1}{Sin\theta_2}$

where,

η₁ = refractive index of first substance = ?

η₂ = refractive index of second substance = 1.5

θ₁ = angle of incidence = 30°

θ₂ = angle of refraction = 60°

Therefore,

$\frac{1.5}{\eta_1} = \frac{Sin\ 30^0}{Sin\ 60^0}$

η₁ = 2.6

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2 years ago

Two rocks, A and B, are thrown horizontally from the top of a cliff. Rock A has an initial speed of 10 meters per second and roc

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Answer:

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Explanation:

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1 year ago

A 1502.7 kg car is traveling at 33.1 m/s when

Bond [772]

By definition of average acceleration,

a = (20 m/s - 33.1 m/s) / (4.7 s) ≈ -2.78 m/s²

Vertically, the car is in equilibrium, so the net force is equal to the friction force in the direction opposite the car's motion:

∑ F = (1502.7 kg) (-2.78 m/s²) ≈ -4188.38 N ≈ -4200 N

If you just want the magnitude, drop the negative sign.

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3 years ago

Find the range of a projectile launched at an angle of 30° with an initial velocity of 20m/s.

Tems11 [23]

Answer:

The range is 35.35 m

Explanation:

Projectile Motion

It's the type of motion that experiences an object projected near the Earth's surface and moves along a curved path exclusively under the action of gravity.

Being vo the initial speed of the object, θ the initial launch angle, and $g=9.8m/s^2$ the acceleration of gravity, then the maximum horizontal distance traveled by the object (also called Range) is: