Help pls it’s urgent giving brainiest!!

Answer:

 θ₁ =  140º,    θ₂ =  -40º

Explanation:

For this exercise we must use Malus's law

        I = Io cos² θ

where the angle is between two polarizers.

When the non-polarized light reaches the first polarized light, the vertically polarized light passes          

         I₁ = I₀ / 2

This light reaches the second polarizer and the light that comes out of this polarizer must reach the third polarized one, it is requested that no light comes out of it, for which the polarizer B must be at 90º from the third, so the possible angles are

         θ₁ = 50 + 90 = 140º

         θ₂ = 50 - 90 = -40º

The approximate heat transfer through 1.65 cm of air with a temperature difference of 23.0 °C is approximately 24.4 J/s.

To approximate the heat transfer through the air layer in the double-paned window, we can assume that the glass layers have a negligible impact on the heat flow. The heat transfer can be calculated using Fourier's Law of Heat Conduction, which states that the heat flow (Q) is proportional to the temperature difference (ΔT) and inversely proportional to the thickness (L) and thermal conductivity (k) of the material.

First, we need to calculate the effective thermal conductivity of the air layer due to its thickness and the thermal conductivity ratio between air and glass. Let's denote the thermal conductivity of air as k_air and the thermal conductivity of glass as k_glass. Since glass has a thermal conductivity roughly 36 times greater than air, we have k_glass = 36 * k_air.

Next, we calculate the effective thermal conductivity of the air layer as:

k_eff = (k_air * L_air) / (L_air + k_glass)

Substituting the given values, we have:

k_eff = (k_air * 0.0165 m) / (0.0165 m + 0.005 m) = 0.01309 * k_air

Now, we can calculate the heat flow per second through the air layer using the formula:

Q = (k_eff * A * ΔT) / L_air

Substituting the given values, we get:

Q = (0.01309 * k_air * 0.760 m^2 * 23.0 K) / 0.0165 m = 24.4 J/s

Therefore, the approximate heat transfer through 1.65 cm of air with a temperature difference of 23.0 °C is approximately 24.4 J/s.

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Answer: 2.67 m/s

Explanation:

Given

Mass of block A  is \(m_a=2\ kg\)

mass of block B is \(m_b=3\ kg\)

The initial velocity of block A \(u_a=5\ m/s\)

the initial velocity of block B is \(u_b=0\)

After collision velocity of block A is \(v_a=1\ m/s\)

Conserving momentum

\(m_au_a+m_bu_b=m_av_a+m_bv_b\\\\2\times 5+3\times0=2\times 1+3\times v_b\\\\v_b=\dfrac{8}{3}=2.67\ m/s\)

The momentum of block A after the collision is \(P_a=2\times 1=2\ kg.m/s\)

Therefore, there is no change in sign.

Answer: because when you remove the battery, the the magnet no longer has electricity flowing through it, therefore the magnetic field disappears. Thats why its called a temporary magnet

Explanation:

According to the given statement, the speed of a point on the rim  is 2.68 m/s.

Energy is a major factor in our everyday routines even though it is an essential need for humans. Our human-made structures are not only heated by energy, but also cooled by it. To lift you finger, climb out of bed, or even stroll down main sidewalk, you need energy.

kinetic energy = E = 0.18 J  

mass = m = 100g = 0.1 kg

diameter = d = 8.0 cm = 0.08 m

Speed = v = ?

v = 2.44 m/s

Briefing:

First convert diameter into radius

r = d/2 = 0.08/2 = 0.04 m

The moment of inertia of disc is given by

I = 0.5mr²

In which m is the disk's mass & r is its radius

I = 0.5(0.1)(0.04)²

I = 0.00008 kg.m²

Additionally, since we are discussing rotating motion, rotational kinetic energy is provided by

E  =  0.5 I ω²

we have to separate ω

ω² = E/0.5 I

ω = √E/0.5 I

ω = √0.18/0.5(0.00008)

ω = 67.08 rad/sec

Finally we know that speed is given as

v = ω r

v = 67.08 (0.04)

v = 2.68 m/s

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Answer:

Explanation:

mass of probe m = 474 Kg

initial speed u = 275 m /s

force acting on it F = 5.6 x 10⁻² N

displacement s = 2.42 x 10⁹ m

A )

initial kinetic energy = 1/2 m u²  , m is mass of probe.

= .5 x 474 x 275²

= 17923125 J  

B )

work done by engine

= force x displacement

= 5.6 x 10⁻² x 2.42 x 10⁹

= 13.55 x 10⁷ J  

C ) Final kinetic energy

= Initial K E + work done by force on it

= 17923125 +13.55 x 10⁷

= 1.79 x 10⁷ + 13.55 x 10⁷

= 15.34 x 10⁷ J

D ) If v be its velocity

1/2 m v² = 15.34 x 10⁷

1/2 x 474 x v² =  15.34 x 10⁷

v² = 64.72 x 10⁴

v = 8.04 x 10² m /s

= 804 m /s

Answer:

i think it should be 18

Explanation:

Answer:

B

Explanation:

Answer:

B

Explanation:

The radius of curvature of a biconvex lens be 39.27 cm.

A lens with the desired focal length is built using the lens builder formula. Two curved surfaces make up a lens, although they are not identical. Using the formula provided by the lens maker, we can compute the focal length of the lens if we know its refractive index and the radius of curvature of both its surfaces:

1/f = (μ -1)(1/R₁ - 1/R₂)

Where f be the focal length of the lens. μ be refractive index and R₁ and R₂ be the radii of curvature.

Given that:

Power of the lens = +2.75 diopter

So, focal length of it = + 100/2.75 cm = 36.36 cm.

refractive index: μ =1.54

Radii of curvature R₁ = - R₂ = R =?

So, 1/36.36 = (1.54 -1)(2/R)

⇒ R = 39.27 cm.

Hence,  the radius of curvature of a biconvex lens be 39.27 cm.

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Answer:

I'm pretty sure its the 2nd one.

Answer:

Yes, the object will turn.

Explanation:

The object will turn because there is an net clockwise moment of 5 Nm and an anti-clockwise moment of 10 Nm, resulting in a net clockwise moment of 5 Nm. According to the laws of physics, an object will rotate in the direction of the net torque acting upon it. In this case, the net torque is acting in a clockwise direction, causing the object to rotate in that direction.

Answer:

actually ships are made in newtons third law of motion.it states to every action there is equal and opposite reaction. curved is made in downwards to maintain upthrust and to made balance.

actually it prevents ships from drowning and to move with a heavy mass.

Determine the magnitude of B-A is 53.68

1.4

Magnitude is a term used to describe size or distance. We can relate the magnitude of the movement to the size and movement speed of the object. The magnitude of a thing or an amount is its size. A car moves at a faster pace than a motorcycle, just in terms of speed.

Magnitude is the relative size of an object (mathematics). The mathematical term for a vector's length or size is the norm. By using the symbol |v|, the magnitude of a vector formula can be utilized to determine the length of a given vector (let's say v). This amount is essentially the distance between the vector's beginning point and ending point.

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Answer: 1. The movie one is virtual and the bathroom mirror is real

2. The image is distorted in a way

3. Behind the spoon

Explanation:

The movie one is virtual and the bathroom mirror is real and The image is distorted in a way and Behind the spoon.

In virtual desktops, the desktop environment is segregated from the physical device being used to access it. They are preloaded images of operating systems and apps. Over a network, users can remotely view their virtual desktops.

A virtual desktop can be accessed from any endpoint device, including a laptop, smartphone, or tablet. The user interacts with the client software that was installed on the endpoint device by the virtual desktop provider.

A virtual desktop mimics the appearance and feel of a real workstation. Because robust resources, like storage and back-end databases, are easily accessible, the user experience is frequently even better than that of a physical workstation.

Therefore, The movie one is virtual and the bathroom mirror is real and The image is distorted in a way and Behind the spoon.

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Answer:

Since the two forces are represented by Fap and For, we can assume that Fap refers to the force applied by your hand on the dog while petting it, and For refers to the equal and opposite force applied by the dog's body on your hand.

The diagram showing your hand petting a dog would look something like this:

```

____

/ \

/ \

/ D \

/ \

/____________\

H

```

In this diagram, the force Fap is represented by an arrow pointing from your hand towards the dog's body, and the force For is represented by an arrow pointing in the opposite direction, from the dog's body towards your hand.

We can describe the two forces as follows:

- Fap: The force applied by your hand on the dog's body while petting it.

- For: The equal and opposite force applied by the dog's body on your hand, according to Newton's third law of motion.

In a DC generator, the generated electromotive force (emf) is directly proportional to the rotational speed of the generator's armature and the strength of the magnetic field within the generator.

This relationship is described by the equation for the generated emf in a DC generator:

Emf = Φ * N * A * Z / 60

Where:

Emf is the generated electromotive force (in volts),

Φ is the magnetic flux density (in Weber/meter^2\(meter^2\) or Tesla),

N is the number of turns in the armature winding,

A is the effective area of the armature coil (in square meters),

Z is the total number of armature conductors, and

60 is a constant representing the conversion from seconds to minutes.

From this equation, we can see that the generated emf is directly proportional to the magnetic flux density (Φ) and the product of the number of turns (N), effective area (A), and the total number of armature conductors (Z). This means that increasing any of these factors will result in a higher generated emf.

The magnetic flux density (Φ) can be increased by using stronger permanent magnets or increasing the strength of the field windings in the generator.

The number of turns (N) and the effective area (A) are design parameters and can be optimized for a specific generator. Increasing the number of turns or the effective area will result in a higher generated emf.

Similarly, the total number of armature conductors (Z) can be increased to enhance the generated emf.

By controlling and optimizing these factors, the generated emf in a DC generator can be increased, resulting in higher electrical output. However, it is important to note that there are practical limits to these factors based on the design and construction of the generator.

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Answer:

No

Explanation:

Recall that the hierarchy of wavelength color from minimum wavelength to maximum wavelength is:

\(V < I < B < G < Y < O < R;\) and

\(E \ \alpha \ \dfrac{1}{\lambda}\)

As a result, blue light has a higher energy level than green and red light.

As a result, the surface glows due to the blue LED. The green LED, on the other hand, would not allow the surface to glow as much as the red LED, which has a lower energy level when compared to the green light. As a result, the red LED would not allow the surface to glow as well.

Frequency and wavelength are inversely related, meaning as frequency increases, wavelength decreases. Option A

Mechanical waves, like sound waves and waves on a string, have two basic characteristics: frequency and wavelength. The quantity of oscillations or cycles that a wave completes in a second is referred to as its frequency. Hertz (Hz) is the unit of measurement.

The distance between two consecutive wave points that are in phase with one another, such as two crests or two troughs, is known as the wavelength, on the other hand. Metres (m) or other length units are used to measure it.

The wave equation, where v is the wave's velocity, is its wavelength, and f is its frequency, can be used to explain the relationship between frequency and wavelength. This equation states that if the velocity is constant for a given medium, so as frequency increases, wavelength must decrease to maintain the same velocity.

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part a.

The mass of the heavier object is found to be 160 kg.

part b.

The mass of the lighter object is  determined as 30 kg.

Mass  is described as  a dimensionless quantity representing the amount of matter in a particle or object.

The gravitational force between two objects:

Force  = G * M * m / r²

G =  gravitational constant

r =  distance between the centers of the objects.

We know that Force =\(8.27 * 10^{-6}\)N,

r = 19.0 cm = 0.19 m

M + m = 190 kg.

m = 190 kg - M.

We then solve for M:

\(8.27 * 10^{-6}\) N = G * M * (190 kg - M) / (0.19 m)²

M = 160 kg

for part b.

m = 190 kg - M:

m = 190 kg - 160 kg

m = 30 kg

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The Kinetic energy of the cell phone of mass 0.08 kg is 9 J.

Kinetic energy is the energy of a body in motion.

To calculate the kinetic energy of the cell phone, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the Kinetic energy of the cell phone is 9 J.

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(a) The work done by the donkey on the cart is 59,721.9 J.

(b) The work done by the force of gravity on the cart is -48,434.87 J.

(c) The work done on the cart by friction during this time is 11,315.12 J.

(a) The work done by the donkey on the cart is calculated as follows;

Wd = Fd cosθ

where;

Wd = 375 N x 163 m x cos(12.3)

Wd = 59,721.9 J

(b) The work done by the force of gravity on the cart is calculated as;

Wg =  Fg x d x cosθ

Where;

θ = 90⁰ + 4.03⁰ = 94.03⁰

Wg = (431 kg x 9.81 m/s²) x 163 m x cos (94.03)

Wg = -48,434.87 J

(c) The work done on the cart by friction during this time is calculated as;

Wf = Ff x d x cosθ

where;

Ff = μmg cosθ

Ff = 0.0165 x 431 kg x 9.81 x cos (4.03)

Ff = 69.59 N

Wf = 69.59 x 163 x cos (4.03)

Wf = 11,315.12 J

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Answer:

general steps of performing an autopsy:

1. The body is identified and the relevant information about the deceased is collected.

2. A visual examination of the body is performed to look for any abnormalities or signs of injury.

3. The external examination is followed by an internal examination. The body is opened up to examine the organs, including the brain, heart, lungs, liver, and kidneys, for any signs of disease or injury.

4. The organs are weighed, measured and dissected.

5. Tissue samples are taken and sent for laboratory analysis.

6. The cause of death is determined based on the autopsy findings, and a report is generated.

7. The body is then closed and prepared for release to the family for funeral arrangements.

It is important to note that the specific steps involved may vary depending on the type of autopsy being conducted and the circumstances surrounding the death.

Explanation:

acceleration = change of speed / time

a = Δv / t

Since the speed remains constant, acceleration is zero.

1) 0.0 m/s

Answer:

Converting to and from scientific notation, as well as performing calculations with numbers in scientific notation is therefore a useful skill in many scientific and engineering disciplines. One of the advantages of scientific notation is that it allows you to be precise with your numbers, which is crucial in those industries.

Answer:

The angular velocity is slowing down.

Explanation:

1. Filter absorbs all colors of white light.

2. The light that has passed through a filter, is always dim.

The filter selectively transmits the red and blue portions of the incident white light spectrum, but absorbs most of the green wavelength.

Color filters absorb certain wavelengths of color and transmit the other wavelengths allowing them to be seen.

Therefore in conclusion, the right filter can reduce glare, increase contrast, and make lunar features pop.

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Answer:

Jupiter

Explanation:

For this space trip, the distance to the planet must be taken into account, so Because Jupiter is much closer it should be the correct choice

.

It must also be taken into account that Saturn has a series of rings, for which the ship has a probability of colliding with one of these in one of its turns, therefore taking this into account, Jupiter must also be chosen.

Answer:

sorry I'm not smart

Explanation:

Plasma lacks a precise form or volume, much like gas. It completes the empty space. Even though it is in the gaseous form, there is a difference because some of the particles are plasma-ionized.

High-energy particles are free to move around and fill the area they inhabit in the state of matter known as gas.

Neutral atoms or molecules often make up gaseous substances like air.

The ionised gas known as plasma, on the other hand, contains both positively and negatively charged particles.

It develops when a gas is subjected to an intense electric field or heated to incredibly high temperatures.

Plasma is a substance that may be found in stars, lightning, and fluorescent lights. It is also an essential component of many modern technology, like plasma TVs and fusion reactors.

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