what did bohr contribute to modern atomic theory

The answer is 4 kg m/s

because p = m x v , 2 kg x 2m/s = 4 kg m/s

Answer: The momentum of the toy car is 4 kg.m/s

Explanation:

Momentum is defined as the force that keeps the object moving.

It is also defined as the product of mass and velocity of an object.

Mathematically,

[tex]p=m\times v[/tex]

where,

p = momentum of the toy car = ?

m = mass of the toy car = 2 kg

v = velocity of the toy car = 2 m/s

Putting values in above equation, we get:

[tex]p=2kg\times 2m/s\\\\p=4kg.m/s[/tex]

Hence, the momentum of the toy car is 4 kg.m/s

Area is the scalar quantity,

Answer:

The correct answer is option B.

Explanation:

Scalar quantity are those which only have magnitude and no direction.

For example:  mass, time, distance etc.

Vector quantity are those which have  both magnitude and direction.

For example:  displacement , velocity etc.

From the given options, the quantity which is scalar is are a because it only has magnitude but no directions.

Where acceleration, velocity, displacement  and force all are vector quantities.

Hence, the correct answer is option B.

The mucilage in hornwort cells is crucial for maintaining water balance, protecting the plant from drying, aiding in nutrient capturing, and promoting bacterial interaction. It ensures the plant's survival and growth prospects in various environments.

The mucilage in the spaces around the cells of hornworts serves a critical role in maintaining the plant's water balance and protecting it from drying out. It does this by absorbing water and creating a moist environment that helps in preventing water loss via transpiration. Additionally, the mucilage also aids in nutrient capturing and bacterial interaction that promotes the growth of the plant.

This is extremely important as it not only improves the plant's survival rate in various environments but also allows the plant to photosynthesize effectively, and thus, grow and propagate successfully. So, understanding the role of mucilage in hornworts is crucial for their conservation and in understanding plant adaptation mechanisms in general.

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Mucilage in hornwort cells stabilizes water content, ensuring hydration, and binds pathogens to protect against infections. It also improves root-soil contact, enhancing nutrient and water absorption. These functions are essential for the hornwort's survival and growth.

The mucilage in the spaces around the cells of hornworts plays several critical roles. Firstly, it helps to stabilize the water content of the surrounding environment, ensuring that the hornwort cells remain hydrated even during dry conditions. This is crucial for the plant's survival and growth. Additionally, the mucilage helps to bind pathogens, protecting the cells from potential infections. This dual role of maintaining hydration and offering protection is essential for the overall health and longevity of the hornwort.

Moreover, mucilage improves the contact between the root and soil, preventing gaps which would drastically reduce the absorption of water and nutrients. Additionally, the mucilage's high water content and resistance to proteolysis due to its extensive mucosylation make it an effective barrier and stabilizer in various environmental conditions.

First method

initial distance = 16m

final distance= 43 m

total distance covered= final -initial

                                     =43m -16m

                                     =27m

Second method

Si= 16m

Sf =43 m

t= 12 s

first we will find V

V =  (Sf-Si)/ t

V =( 43- 16)/ 12

V = 27/12  ⇒ V= 9/4

V= distance / time

distance= V×time

distance = (9/4) ×12

distance =27

If they're dropped from the same height at the same time and there's no air resistance, the the lighter ball and the heavier ball, as well as a feather, a hammer, a bowling ball, a speck of dust, a school bus, and a battle ship, will all fall side-by-side and hit the ground at the same time.  

We've known this for about 400 years, since Galileo.  And we've known WHY for about 300 years, since Newton.

Answer:

You can drink 18 drinks and 1.38 dollars left with you.

Explanation:

1 drink cost 1.59 dollars

You have 30 dollars with you.

Number of drinks in 30 dollars = [tex]\frac{30}{1.59}[/tex]

Number of drinks in 30 dollars = 18

From division 1.36 remains as remainder so, 1.38 dollars left with you.

The Sun is a star around which our planet Earth and other planets and satellites of our solar system revolve along specific orbits. Sun appears to be spherical in shape and consists of glowing hot gases. It contains mostly hydrogen and helium gases. The temperature of the gas mixture is extremely high.

Therefore, the Sun mostly composed of hydrogen and helium gases.

(Answer) B. Composition mostly hydrogen and helium gas, Mass 1.989 x 10^30 Kg

The star is moving at about [tex]\(906.6 \, \text{km/s}\)[/tex] away from the Earth

Why is this correct?

The calcium H line typically appears at a wavelength of 396.9 nm. However, in the spectrum of a particular star, it registers at 398.1 nm. To determine the star's velocity, we'll employ the Doppler effect formula for wavelength shift:

[tex]\[\frac{\Delta \lambda}{\lambda_0} = \frac{v}{c}\][/tex]

Where:

[tex]\(\Delta \lambda\)[/tex] represents the change in wavelength.

[tex]\(\lambda_0\)[/tex] denotes the rest wavelength (396.9 nm for the calcium H line).

[tex]\(v\)[/tex] stands for the star's velocity.

[tex]\(c\)[/tex] is the speed of light.

The calculation involves finding [tex]\(v\)[/tex], the star's velocity. Rearranging the formula yields:

[tex]\[v = \frac{\Delta \lambda}{λ_0} \times c\][/tex]

Starting with the difference in wavelengths:

[tex]\[\Delta \lambda = \lambda - λ_0 = 398.1 \, \text{nm} - 396.9 \, \text{nm} = 1.2 \, \text{nm}\][/tex]

Substituting the values into the equation:

[tex]\[v = \frac{1.2 \, \text{nm}}{396.9 \, \text{nm}} \times 299,792 \, \text{km/s}\][/tex]

This computation yields:

[tex]\[v \approx 0.003021 \times 299,792 \approx 906.4 \, \text{km/s}\][/tex]

Therefore, the star is moving at about [tex]\(906.6 \, \text{km/s}\)[/tex] away from the Earth.

Complete question:

The h line in calcium is normally at 396.9 nm. however, in a star's spectrum, it is measured at 398.1nm. how fast is the star moving and is it moving towards the earth or away from the earth?

Force applied on the car due to engine is given as

[tex]F_1 = 300 N[/tex] towards right

Also there is a force on the car towards left due to air drag

[tex]F_2 = 150 N[/tex] towards left

now the net force on the car will be given as

[tex]\vec F_{net} = \vec F_1 + \vec F_2[/tex]

now we can say that since the two forces are here opposite in direction so here the vector sum of two forces will be the algebraic difference of the two forces.

So we can say

[tex]F_{net} = F_1 - F_2[/tex]

[tex]F_{net} = 300 - 150[/tex]

[tex]F_[net} = 150 N[/tex]

So here net force on the car will be 150 N towards right and hence it will accelerate due to same force.

AS Weight = w =mg

          m= 70kg

 g on mercury =3.7 m/s²

so  W = (70kg) ( 3.7m/s²)

      w=259 kgm/s²

w = 259 N

Speed of the cannon is 95 m/s

now we will find its two components

speed in horizontal direction is

[tex]v_x = 95 cos15[/tex]

[tex]v_x = 91.76 m/s[/tex]

speed in vertical direction is

[tex]v_y = 95 sin(-15)[/tex]

[tex]v_y = -24.6 m/s[/tex]

now the time taken by the cannon to reach the water surface will be find out by using kinematics

[tex]\Delta y = v_y * t + \frac{1}{2} at^2[/tex]

[tex]-3 = -24.6 * t - \frac{1}{2}9.8 * t^2[/tex]

[tex]4.9t^2 + 24.6 t - 3 = 0[/tex]

By solving above quadratic equation

[tex]t = 0.12 s[/tex]

now in the same time the horizontal distance moved by the cannon

[tex]d_x = v_x * t[/tex]

[tex]d_x = 91.76 * 0.12[/tex]

[tex]d_x = 10.93 m[/tex]

Since the distance of crewmen is 20 m so it will definitely safe as cannon will hit at distance 10.93 m

Final answer:

To determine the total distance traveled by Chuck Wagon during 12 minutes of motion, multiply the velocity by the time.

Explanation:

To determine the total distance traveled by Chuck Wagon during 12 minutes of motion, we can use the formula:

Distance = Velocity * Time

Given that the velocity of Chuck Wagon is 0.5 mile/minute and the time is 12 minutes, we can substitute these values into the formula:

Distance = 0.5 mile/minute * 12 minutes = 6 miles

Therefore, Chuck Wagon traveled a total distance of 6 miles during 12 minutes of motion.

Tha conceptual model depends upon the process flow.

The conceptual model is actually used in the system to stimulate, understand or explore the subject for the better understanding of people. As it consists of different constituents as validation, implementation, accreditation etc. can be affected by the process flow. The process flow has actually consisted of the management, monitoring of objects for specific subject and scales under these monitoring or management are proceedings. As these scales of process flow effects, the objectives of the task impacts.

If this comes up on the exam, you should recite Newton's 3rd law of motion quietly to yourself.

true :) i took a science test and that question is correct

1) This method allows people to do orderly research.

2) This method allows people to make new Discoveries.

hope this helps you!

Answer: This method allows people to conduct orderly research.

This method allows people to make new discoveries.

Explanation:

Scientific method is a detailed experimental protocol is required to be followed in order to prove a reason of cause of natural phenomena occurring in nature.

By utilizing scientific methods people conduct research. If a proper methodology is followed till the end of the experimentation process it will result in new outcomes different from the preposed observations and results. This will lead to new innovations.

Answer:

Option D is quantities described by both magnitude and direction is the correct answer.

Explanation:

A scalar is quantity with magnitude only. It does not have direction. Examples of scalar are distance, speed, time etc.

A vector is quantity with both magnitude and direction. Some examples for vectors are displacement, velocity, acceleration, force, moment, electric field, magnetic field etc.

Here option A, quantities described by both force and gravity is not correct.

Option B is quantities described by both speed and movement is also not correct.

Option C is quantities described by both velocity and acceleration is also not correct.

Option D is quantities described by both magnitude and direction is the correct answer.

To calculate acceleration from a velocity-time graph, determine the slope of the graph at a specific point by dividing the change in velocity by the change in time.

To calculate acceleration from a velocity-time graph, you need to find the slope of the graph at a specific point. Acceleration represents the rate of change of velocity, and the slope of a graph represents the rate of change of the dependent variable with respect to the independent variable.

Here are the steps to calculate acceleration from a velocity-time graph:

Identify the specific point on the graph where you want to determine the acceleration.

Draw a tangent line to the curve at that point. The tangent line should touch the curve at only one point.

Measure the slope of the tangent line. You can do this by determining the change in velocity (Δv) and the change in time (Δt) between two points on the tangent line.

Calculate the acceleration by dividing the change in velocity by the change in time: acceleration (a) = Δv / Δt.

Note: If the velocity-time graph is a straight line, the acceleration is constant throughout, and you can calculate it by taking the slope of the line directly.

Remember that the units of acceleration will depend on the units used for velocity (e.g., meters per second, miles per hour) and time (e.g., seconds, minutes).

Therefore, Determine the slope of the graph at a certain point by dividing the change in velocity by the change in time in order to calculate acceleration from a velocity-time graph.

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Answer:

The acceleration of the rabbit is 2[tex]\frac{m}{s^{2}}[/tex].

Explanation:

A rabbit starts from a resting position and moves at 6 m/s after 3 seconds.

Applying first equation of motion we get,

v = u + a t

v = final velocity = 6 m/s

u = initial velocity = 0 m/s

t = time = 3 s

a = acceleration

6 = 0 + a (3)

a = 2[tex]\frac{m}{s^{2}}[/tex]

The acceleration of the rabbit is 2[tex]\frac{m}{s^{2}}[/tex].

Answer:

Applying first equation of motion we get,

v = u + a t

v = final velocity = 6 m/s

u = initial velocity = 0 m/s

t = time = 3 s

a = acceleration

6 = 0 + a (3)

a = 2

The acceleration of the rabbit is 2.

Explanation:

Apply the first equation of motion

30x30=900

The answer is 900 meters after 30 seconds

The car traveling at 30 metres per second will cover a total distance of 900 metres in 30 seconds, calculated using the formula distance equals speed multiplied by time.

To calculate the distance travelled by a car moving with a speed of 30 metres per second over a period of 30 seconds, we use the formula for distance which is the product of speed and time.

The distance d is calculated as follows:

Hence, substituting the given values:

Therefore, the car will travel a total distance of 900 metres in 30 seconds.

After all the ice has melted, the temperature of the water inside the beaker starts to increase. The constant temperature during the melting process is due to the latent heat of fusion, and only after melting, absorbed heat increases water's temperature.

The temperature of the water inside the beaker after all of the ice melts begins to increase. When ice is in the process of melting, it absorbs heat from its surroundings without a change in temperature, maintaining a temperature of 0°C until it has completely melted. This absorption of heat at a constant temperature is due to the latent heat of fusion, which is the energy required to change a substance from the solid phase to the liquid phase at constant temperature and pressure. Once all the ice has melted, any additional heat the water absorbs increases its temperature. This is due to the fact that the energy absorbed by the water is now used to increase the kinetic energy of the water molecules, resulting in a temperature increase.

Figure 10.26 illustrates this phenomenon with a beaker of ice starting at -12.0°C and gradually warming to 0°C as it absorbs heat. Initially, a small amount melts, but the overall temperature does not increase until all of the ice is melted. Only then does the temperature of the now liquid water begin to rise, eventually reaching 22.2°C due to continued heat absorption.

The answer to this question is conductor.

The substance contains different physical properties are the transfer of energy, conductivity, density, melting and freezing etc. Any object that can transfer the energy in the form of heat or electrical conductivity can be called as conductors. It is the property of conductors to transfer the energy of heat from one side to another side of the object. The conductors have the follows the rule of the conduction process to perform this specific function.

So, the right answer to this question is the conductor.

force of friction on the cart is given as

[tex]F_f = 280 N[/tex]

here we also know the reaction force due to surface

[tex]R = 766 N[/tex]

so we can say reaction force is given as

[tex]R = \sqrt{F_n^2 + F_f^2}[/tex]

[tex]766 = \sqrt{F_n^2 + 280^2}[/tex]

[tex]F_n^2 = 766^2 - 280^2[/tex]

[tex]F_n = 713 N[/tex]

now by force balance we will say

[tex]F_y + F_n = mg[/tex]

[tex]F_y = mg - F_n[/tex]

[tex]F_x = F_f[/tex]

also we know that

[tex]F_f = \mu * F_n[/tex]

[tex]280 = \mu * 713[/tex]

[tex]\mu = 0.39[/tex]

now minimum force required to set this into motion

[tex]F_{min} = \frac{\mu mg}{\sqrt{1 + \mu^2}}[/tex]

here we know that

[tex]mg = F_n = 713 N[/tex]

[tex]F_{min} = \frac{0.39* 713}{\sqrt{1 + 0.39^2}}[/tex]

[tex]F_{min} = 259 N[/tex]

So it will require 259 N minimum force to move it

C.  

carbon and hydrogen are elements and methane is a compound.

Answer:

C. carbon and hydrogen are elements and methane is a compound.

Explanation:

Elements are substances which have one type of atoms. Compounds are substances which have different types of atoms. Since, Carbon and Methane have only one type of atoms and thus, these are pure substances. Methane  contains atoms of Carbon and Hydrogen chemically combined together. Thus, methane is a compound.

A. m/s is a unit for speed.

Minutes, meters, and kilometers are incorrect.

Please brainliest me if this helped; trying to level up!

The unit for speed is meter per second ( m/s).  

Answer : Option A

Explanation:

The speed is the measure of the total distance traveled over a specified or particular time. Therefore, and as we know that the unit of distance is meter and that of time is seconds according to the S. I. unit of system. Therefore the unit of speed written as the meter per second, or, m / s, or, m s -1.

Final answer:

Projectile motion is created by the combination of horizontal motion at constant velocity and vertical motion with constant acceleration due to gravity, resulting in a curved trajectory.

Explanation:

The two kinds of motion that combine to produce projectile motion are horizontal motion and vertical motion. The horizontal motion of a projectile happens at a constant velocity, due to the absence of horizontal forces acting on the projectile (ignoring air resistance). On the other hand, the vertical motion occurs with constant acceleration due to gravity acting on the projectile. When these two motions—horizontal and vertical—combine, they form the characteristic curved trajectory of a projectile motion.

For example, when a football is kicked, it travels horizontally forward while also being pulled down by gravity. The resulting path is a parabola. This is a classical example of projectile motion where the horizontal motion, which is constant, and the vertical motion, which is accelerated by gravity, work simultaneously to guide the motion of the projectile.

The answer is kinetic friction.

Answer:

Kinetic friction

Explanation:

When body is in rest then static friction force will act in opposite direction .Ans this force will given as follows

[tex]fr_s=\mu _{st}mg[/tex]

[tex]\mu _{st}\ is\ the\ coefficient\ of\ static\ friction[/tex]

When body is in motion then kinetic friction force will act in opposite direction .Ans this force will given as follows

[tex]fr_k=\mu _{k}mg[/tex]

[tex]\mu _{k}\ is\ the\ coefficient\ of\ kinetic\ friction[/tex]

When body rolls then rolling friction will act.

When body will slid then sliding friction will act.

I’m pretty positive that it’s A. Conduction. Just refer to the definition of it.

Answer:

A device is a burner from an electric stove. Then the conduction heat is transferred to a pot.

Conduction heat is a method of heat transfer in which the the transfer is takes place by direct contact between objects. From the question , it is clear that, the burner from electric stove transfers energy to a bottom of the pot sitting on it.

Answer:

you’re correct i think

The internal pressure increases as the gas is heated