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3 years ago

Explain what bias means when it comes to a scientific experiment.

Physics

1 answer:

Nookie1986 [14]3 years ago

6 0

Answer:

bias refers to effects that a conclusion that may be incorrect, as for example when a researcher patient knows what treatment is being given, to avoid bias a blinded study may be done

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Consider the possibility of using two rotating cylinders to replace the conventional wings on an airplane for lift. Consider an

EleoNora [17]

Answer:

27.35m

Explanation:

For the calculation of the Support Force we rely on the formula for obtaining the force in a cylinder of a certain length l,

$F_y = - \rho Ul\Gamma$

Here each term is,

$F_y$ = Lift force

$\rho$ = density of air

$\Gamma$ = vortex strength

For this last equation, its mathematical representation is given by,

$\Gamma = 2\pi av_{\theta}$

Here each term is,

a= 1m, radios of cylinder

$v_{\theta}= 20 Km/hr=5.5m/s$ , the velocity of cylinder surface.

$\Gamma = 2\pi (1)(5.5) = 34.90m^2/s$

In order to find the density of the area at 2000m we will refer to the table of Standard Atmosphere of the United States, that is $1.007kg/m^3,$

$U= 150Km/hr = 41.6m/s, F_y = 40000N, \Gamma = 34.90m^2/s$

Replacing the values,

$40000 = -(1.007)(41.6)l(34.90)$

Clearing l and solving for it we have,

$l=-27.35m$

<em>In this way we can conclude that the length of the cylinder must be 27.35m</em>

7 0

4 years ago

A uniform non-conducting ring of radius 2.68 cm and total charge 6.08 µC rotates with a constant angular speed of 4.21 rad/s aro

Harrizon [31]

Answer: 1.72*10^-7

Explanation:

Given

Radius of the ring, r = 2.68 cm = 0.0268 m

Charge on the ring, q = 6.08 µC

Angular speed of the ring, w = 4.21 rad/s

First, we know that the charge per unit area, σ = q / πr²

Also, the charge on ring of width, dr = σ⋅2πrdr

The Magnetic moment of this ring of width dr.dμ = i⋅A

If we integrate dr at R(top) and at 0(bottom), we get

∫dµ = ∫(R, 0) T⋅2πrdr.(w/2π).πr²

On finding at (R, 0), we get

μ = qwR² / 4

On substituting our values, we have

μ = (6.08*10^-6 * 4.21 * 0.0268) / 4

μ = (6.08*10^-6 * 0.113) / 4

μ = 6.87*10^-7 / 4

μ = 1.72*10^-7

The magnitude of the magnetic moment is 1.72*10^-7

7 0

3 years ago

What is the energy of the 30 kg skateboarder at 2 m off the ground traveling at 3 m/s?

zubka84 [21]

1) The kinetic energy of an object is given by:

where m is the object's mass and v its speed.

By using this equation, we find the initial kinetic energy of the skateboarder:

and the final kinetic energy as well:

So, her change in kinetic energy is

2) The work-energy theorem states that the work done to increase the speed of an object is equal to the variation of kinetic energy of the object:

Therefore, the work done by the skateboarder is

8 0

3 years ago

Compared to yellow light,orange light has

ArbitrLikvidat [17]

<span>So we wonder how can we compare yellow and orange light. Light is a small art of electromagnetic spectrum which is a continuum of all electromagnetic waves arranged by wavelenght and frequency. So on the EM spectrum orange has greaterr wavelangth than yellow but smaller frequency because wavelength and frequency are connected by the equation: c=f*lambda, where lambda is the wavelength and c is the speed of light and f is the frequency. We see that the higher the frequency the smaller the wavelength and vice versa.</span>

5 0

4 years ago

If the clot breaks free and only experiences a force due to the blood pressure, what is the relationship between the pressure on

Bingel [31]

Answer:

The pressure on each side of the clot is same.

Explanation:

The clot is moving with a constant velocity which implies that the total force on the clot is zero.

The force F is given by the formula.

F=ΔPA

where ΔP is the difference in pressure and A is the area.

Since the force is same on either side, therefore,

ΔPA=0

Also, the area is same on both side of the clot.

Therefore the difference in the pressure of both side is zero which implies that the pressure on both sides are equal.

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2 years ago