Janet ran 30 meters in 4 seconds,what is her speed.

Answer:

Explanation:

Radius of first spherical ball =

2

2

​

cm=1cm

Radius of second spherical ball =

2

2

3

14.5

​

​

cm=

3

14.5

​

cm

Let the radius of the third ball be r cm.

Radius of the main spherical ball =

2

5

​

cm=2.5cm

Volume of main spherical ball = Volume of spherical ball  1+Volume of spherical ball 2+ Volume of spherical ball 3

Volume of a sphere =

3

4

​

πr

3

So,  

3

4

​

π×2.5

3

=

3

4

​

π1

3

+

3

4

​

π(

3

14.5

​

)

3

+

3

4

​

πr

3

⇒2.5

3

=1

3

+(

3

14.5

​

)

3

+r

3

⇒r

3

=15.625−1−14.5

⇒r

3

=0.125=0.5×0.5×0.5

⇒r=0.5

Answer:

The change in her position (from beginning to end), along with the direction, is considered her displacement.

Explanation:

Answer:

The change in her position ( from beginning to end), along with the direction, is considered her displacement. This value is a measurement and a direction. The total distance along the path from her starting point to her endpoint is considered her distance. This value is a measurement only.

If a second electron is placed close to a proton, the force that would be exerted on the first electron It doubles.

A clear connotation is attached to the term "force." The terms "push" and "pull" are perfectly acceptable at this level to describe forces. Another item applies a force to the first. Both living things and non-living objects can be considered to be parts of a force.

The terms "contact forces" and "non-forces" refer to different kinds of forces. Forces include, among others, nuclear force, gravitational force, frictional force, magnetic force, electrostatic force, and spring force.

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Given:

The dimensions of the square electrodes are 2.7 cm x 2.7 cm

The spacing between them is d = 0.4 mm

A battery of 81.45 V is connected.

Required:

To calculate the capacitance in pico Farads.

Explanation:

The capacitance can be calculated by the formula

Here, A is the area of the electrode.

The electric permeability in free space is

On substituting the values, the capacitance will be

Final Answer: The capacitance is 16.13 pF.

The light-collecting area would be 4x greater on a 6-meter (which has 36) telescope than a 3-meter telescope (which has 9).

Answer: 9.79m/s2

Explanation: Just did a quiz with this question

Answer:

Digestive = large instestine

respiratory = lungs

circulatory red blood cell

neurons=nerves

Explanation:

Answer: At the antinodes of a standing wave, the wave is shaking very rapidly, causing those parts of the pizza to get hot. At the nodes, the wave is not shaking much at all, causing those parts of the pizza to stay cold."

Explanation:

antinodes vibrate and are the opposite of nodes which are stationary.

Some parts of the pizza are hot while others are still cold. Because the antinodes of a standing wave shake very quickly, causing the hot spots on the pizza to appear.

The fact that there are locations along the medium that appear to be standing still is a feature of every standing wave pattern.

The term "node" refers to these sites, which are also known as "points of no displacement." Other sites along the medium are subjected to vibrations with substantial positive and negative displacements.

During each vibrational cycle of the standing wave, these are the locations that experience the most displacement. These points are termed "antinodes" because they are the polar opposites of nodes.

The antinodes of a standing wave shake very quickly, causing the hot spots on the pizza to appear. The wave isn't moving very much at the nodes, therefore those areas of the pizza stay cold."

Hence some parts of the pizza are hot while others are still cold.

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The value of charge q on an equipotential surface that surrounds a point charge is calculated to be 12.52× 10⁻⁹ C.

The expression to find out electric potential at a distance r is given by,

v = k q /r

where,

v is electric potential

q is charge

r is distance

k is coulomb's constant (9 × 10⁹ Nm²/C²)

Electric potential is given as 490 V.

Area is given as 1.1 m². The expression for area is A = 4 π r².

Making r as subject, we have,

Radius r = √(A/4π) = √(1.1/4π) = √0.087 = 0.23 m

To find out charge, let us make q as subject,

q = v r / k = (490 × 0.23)/(9 × 10⁹) = 12.52× 10⁻⁹ C

Thus, the charge on an equipotential surface that surrounds a point charge is calculated to be 12.52× 10⁻⁹ C.

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Sound intensity is inversely proportional to the square of the distance traveled by the sound.

Sound, a mechanical disturbance from a state of equilibrium that propagates through an elastic material medium. The sound travels in all the mediums i.e. solid, liquid, and gas.

According to the question, the sound frequency which he is hearing is 20dB when he is standing 8m away from the engine.

Sound intensity is inversely proportional to the square of the distance traveled by the sound. Thus;

r1^2 divide by r2^2 = L2divideL1

where r= distance (m)

L= sound intensity (decibel dB)

8squared divide by 4 squared = L2 divide 20 dB

L2 = 4 × 20

L2= 80 dB

This means that the sound is increased from 20 dB to 80 db.

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The magnitude of the first particle's initial acceleration in \(2.25 * 10^6 m/s^2\)

The equation for the force between two charged particles is:

F = (k * q1 * q2) / d^2

where k is the Coulomb constant (8.99 x 10^9 Nm^2/C^2), q1 and q2 are the magnitudes of the charges, and d is the distance between them.

Since the first particle is released from rest, its initial acceleration is equal to the net force acting on it, which is the force between the two charged particles.

So,

a = F / m

where m is the mass of the first particle. Substituting the values and converting units, we get:

\(a = (k * 5 * 10^-^9 * 10 * 10^-^9 ) / (0.02 )^2\\\\a = (8.99 x 10^9 /C^2 * 5 * 10^-^9 * 10 x 10^-^9 ) / (0.02 )^2\\\\a = 2.25 x 10^6 m/s^2\)

What is Coulomb's Law?

According to Coulomb's law, the force of attraction or repulsion between two charged bodies is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

What is Coulomb's law formula?

The unit of the electrostatic force is Newton (N). Electrostatic force = (Coulomb constant) absolute value of (charge 1) (charge 2)/ (distance between charges)2.

F = (k * q1 * q2) / d^2

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Answer:

getting shocked

Explanation:

i didnt really get the answer really much but i hope this helps

Answer:

Hair standing up

Explanation:

When there is a lot of static electricity, your hair stands up.

Answer:

Possibly shape.

Explanation:

Because it is ripped in half. As you guys and the questioner can see that there is a wiggly strip down the middle. That also cause of a shape change.

I really hope my answer is right ^_^  

The characteristic of matter which is undergoing change in the picture is it's shape as it is being teared apart.

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.Matter possesses both particle and wave characteristics.Phase is a form of matter having uniform composition as well as physical properties.

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"Red, Yellow, Blue"  is an example of a triad color scheme on the color wheel.

Your question is: Which of the following is an example of a triad color scheme on the color wheel?

A triad color scheme on the color wheel consists of three colors that are evenly spaced from each other.

The correct answer is a). Red, Yellow, Blue.

A triad color scheme is a combination of three colors that are evenly spaced around the color wheel. In this case, red, yellow, and blue form an equilateral triangle on the color wheel, making them a triad color scheme.

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Answer:

I think it is Cinder Cone volcano.

Answer:

So overall, motion and interference of matter are needed equally for friction, which is held together by the force of gravity. Without gravity, everything would have fly away in the universe, and the friction would not have exist. Hence, friction is dependent on gravity.

Elaborately means in a detailed and carefully arranged manner.

Explanation:

hope this helps!!!!

The proof that if the operator \($a_{op}$\) corresponding to the observable \($A$\) is Hermitian, we need to prove that \($A$\) is also a Hermitian operator which is explained below.

We know that \($a_{op}$\) is Hermitian, which means that: \($a_{op}^\dagger = a_{op}$\)

This implies that: \($(a_{op}^\dagger)^2 = (a_{op}^2)^\dagger$\)

Now, we can write \($A$\) in terms of \($a_{op}$\) as \($A = a_{op} + c$\), where \($c$\) is a constant. Using this expression, we can calculate \($A^2$\) as:

\(A^2 = (a_{op} + c)^2 = a_{op}^2 + 2ca_{op} + c^2$\)

Taking the Hermitian conjugate of \($A^2$\) gives:

\($(A^2)^\dagger = (a_{op}^2 + 2ca_{op} + c^2)^\dagger = (a_{op}^2)^\dagger + 2c(a_{op}^\dagger) + c^{*2}$\)

Since we know that \($a_{op}$\) is Hermitian, we have \($(a_{op}^2)^\dagger = a_{op}^2$\), and \($(a_{op}^\dagger) = a_{op}$\). Therefore,

\($(A^2)^\dagger = a_{op}^2 + 2ca_{op} + c^{*2} = A^2 + (c^{*2} - c^2)$\)

For \($A^2$\) to be Hermitian, we need \($(A^2)^\dagger = A^2$\). Therefore, we need \($c^{*2} = c^2$\). This is only true if \($c$\) is real. Therefore, if \($a_{op}$\) is Hermitian, \($A^2$\) is Hermitian only if \($c$\) is real.

In conclusion, we have shown that if the operator \($a_{op}$\) corresponding to the observable \($A$\) is Hermitian, then \($A^2$\) is Hermitian only if the constant \($c$\) is real.

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Answer:

(2) the work required to move the electron is 4.8 x 10⁻¹⁹ J.

Explanation:

Given;

potential difference, V = 3.00 volts

charge of electron, q = 1.6 x 10⁻¹⁹ C

The work required to move an electron is calculated as;

W = Vq

where;

W is the work done in Joules

Substitute the given values and solve for W;

W = (3.00)(1.6 x 10⁻¹⁹)

W = 4.8 x 10⁻¹⁹ J.

Therefore, the work required to move the electron is 4.8 x 10⁻¹⁹ J.

Answer:

Newton's laws of motion relate an object's motion to the forces acting on it.

Explanation:

In the first law, an object will not change its motion unless a force acts on it. ... In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

Answer:

In the first law, an object will not change its motion unless a force acts on it. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

The ray of light reflects at an angle of 40° from the mirror.

The angle of incidence of a ray of light should be equal to the angle of reflection as is stated by the first law of reflection. That is the reason why the ray from the candle reflect at 40° which is equal to the angle of incidence.

The bouncing back of light from a smooth surface is called reflection.

The angle at which a ray of light is incident on a surface or strikes a surface is called angle of incidence.

The angle at which a ray of light reflects from a smooth surface after its incidence is called angle of reflection.

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The location of the object is 1.67 m from the lens when the image is twice the size of the object.

To solve this problem, we can use the lens equation: 1/f = 1/u + 1/v, where f is the focal length, u is the object distance from the lens, and v is the image distance from the lens.

We are also given that the image is twice the size of the object, which means the magnification (M) is 2.

The magnification can be calculated as M = -v/u.
From the magnification equation, we get v = -2u.

Now, we know the object and the image are 5.0 m apart, so v - u = 5.0 m.

Substituting the value of v, we get -2u - u = 5, which gives u = -1.67 m.

Since distances are positive, the object is 1.67 m from the lens.

Hence,  When the image is twice the size of the object, the location of the object is 1.67 m from the lens.

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Answer:

Mars' atmosphere however is 95% carbon dioxide, 3% nitrogen, 1.6% argon, and it has traces of oxygen, carbon monoxide, water, methane, and other gases, along with a lot of dust. Dust hanging in the air colors Martian skies tan in photos taken from the surface. Relative to Earth, the air on Mars is extremely thin.

Explanation:

The turtle's position and direction appropriately after each instruction to ensure accurate drawing. You can also customize the colors, sizes, and shapes to enhance the visual appearance of the AND gate.

To draw an AND gate using turtle graphics, you can use the following set of instructions:

Set up the turtle:

a. Set the turtle's initial position.

b. Set the turtle's pen color and size.

Draw the first input line:

a. Move the turtle forward to the starting point of the line.

b. Draw a straight line segment to represent the first input.

Draw the second input line:

a. Move the turtle to the starting point of the second line.

b. Draw a straight line segment to represent the second input.

Draw the output line:

a. Move the turtle to the starting point of the output line.

b. Draw a straight line segment to represent the output.

Draw the logic gate shape:

a. Move the turtle to the starting point of the gate.

b. Draw a rectangle to represent the gate.

c. Add any necessary labels or symbols to indicate it as an AND gate.

Add connections between lines and gate:

a. Move the turtle to the intersection point of the first input line and the gate.

b. Draw a small line segment to connect the input line to the gate.

c. Repeat the above step for the second input line and the gate.

d. Draw a small line segment to connect the output line to the gate.

Repeat the above steps as necessary to draw multiple AND gates or any additional components.

Remember to adjust the turtle's position and direction appropriately after each instruction to ensure accurate drawing. You can also customize the colors, sizes, and shapes to enhance the visual appearance of the AND gate.

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The acceleration of the car with initial and final speeds is 8.3×10⁻² m/s². and the odometer shows the distance traveled by the car and the speedometer shows the instantaneous velocity.

Acceleration is defined as the change in velocity per unit time. If the velocity increases, it gives acceleration and if the velocity decreases, it represents deceleration. The SI unit of acceleration m/s².

Acceleration (a) = change in velocity/time

the initial speed of the car (u) = 36km/hr = 36×5/18 = 10 m/s  (km/hr is converted to m/min by multiplying 5/18).

the final speed of the car (v) = 54 km/hr = 54 ×5/18 = 15 m/s

time taken of the car = 1 minute = 60 seconds

Acceleration = v-u / t

                      = 15-10/60

                     = 5/60

                     = 0.083 m/s²

                     = 8.3×10⁻² m/s².

The acceleration of the car = 8.3×10⁻² m/s².

The odometer measures the distance traveled by car.

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The question is  incomplete but most probably your full question was,

The odometer of a car reads 36km/hr. A minute later it reads 54km/hr. What acceleration does the car undergo? Express it in the SI unit. What kind of speeds does the odometer show?

Torque is calculated by the cross product of the position of the point of application of force from the axis of rotation on the lever arm and the force applied on the lever arm.

torque = position vector x force

where,

torque, position vector and force are all vector quantities.

The force that may twist an item about its axis is measured as torque. Torque is what causes an object to acquire angular acceleration, just as force is what causes an object to accelerate in linear kinematics.

Being a vector quantity, torque. The force acting on the axis determines the torque vector's direction.

When a force is applied to a certain object, it produces torque, which causes the object to move by spinning around an axis. A force is any kind of action that causes a body's motion to change or its course to be altered.

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Answer:

The peak wavelength emitted by the Sun falls in the yellow-green range in the electromagnetic spectrum.

Explanation:

The Sun's peak wavelength falls in the range of visible light. We know that it's not completely in the infrared zone or completely in the ultraviolet zone because then we'd have some very strange, and hot weather. The yellow-green range is approximately the center of the visible light range. The green-blue range is more closer to the ultraviolet range, so the yellow-green range makes more sense. Even if you don't know for sure where the Sun's peak wavelength falls, as long as you know the rest of what I just said above, you should have a thorough understanding of where the Sun's peak wavelength falls in the electromagnetic zone and why.

I hope this helps. Have a great day or night!

The peak wavelength emitted by the Sun falls in the yellow-green range of the electromagnetic spectrum.

Wavelength is a fundamental property of waves, including electromagnetic waves like light and radio waves, as well as other types of waves, such as sound waves or water waves.

Here,
The peak wavelength emitted by the Sun falls in the yellow-green range of the electromagnetic spectrum. The Sun emits radiation across a broad range of wavelengths, from radio waves to X-rays. However, the majority of the energy emitted by the Sun is concentrated in the visible and near-infrared parts of the spectrum. The peak of the Sun's emission spectrum is in the yellow-green range of the spectrum, with a peak wavelength of about 500 nm (nanometers). This is known as the Sun's blackbody radiation peak, and it corresponds to a temperature of about 5800 Kelvin on the Sun's surface.

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By the end of Greta's first month of pregnancy, her embryo has a heart that has begun to pump blood. Option b is correct choice.

By the end of Greta's first month of pregnancy, the embryo has begun production of nerve cells that store information, but it does not have a heart that has begun to pump blood, nor can it suck its thumb or bend its arms.

During the first month of pregnancy, the embryonic cells divide rapidly and differentiate into various types of cells, including those that form the neural tube and eventually give rise to the nervous system. The heart does not begin to beat until around week 5, and the embryo does not have developed limbs or the ability to suck or grasp until later stages of development.

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--The complete question is, 1.By the end of Greta's first month of pregnancy, her embryo ________.

a. has begun production of nerve cells that store information

b. has a heart that has begun to pump blood

c. can suck its thumb

d. can bend its arms--

1. D

2. B

3. D

No 4?

5. C