please help!!!!!!!!!!

Explanation:

Initial velocity is 25m/s i.e. u. Final velocity would be zero since the bus stopped. It is noted that the bus deccelartion of 4m/s, so the acceleration should be considered negative of 4m/s I.e. 4m/s. So using third law of motion i.e.

v^2 - u^2= 2as

(0)^2 - (25)^2= -2×4×s {Note here I used minus sign in acceleration}

-625 = -8×s

s=625 ÷ 8

s= 125 m

So bus would cover a distance of 125m before coming to rest.

Answer:

ya thats right they cant swim

Explanation:

Answer:

[tex]11.3\ \text{g/cm}^3[/tex]

[tex]7.92\ \text{g/cm}^3[/tex]

[tex]238.1\ \text{cm}^3[/tex]

Explanation:

8) Volume of lead

[tex]V=4.5\times 5.2\times 6\\\Rightarrow V=140.4\ \text{cm}^3[/tex]

m = Mass of block = 1587 g

Density is given by

[tex]\rho=\dfrac{m}{V}\\\Rightarrow \rho=\dfrac{1587}{140.4}\\\Rightarrow \rho=11.3\ \text{g/cm}^3[/tex]

Density of lead is [tex]11.3\ \text{g/cm}^3[/tex]

9) Volume of lead = Volume of water displaced = (49.1-45.5) = 3.6 mL = [tex]3.6\ \text{cm}^3[/tex]

m = Mass of iron = 28.5 g

Density is given by

[tex]\rho=\dfrac{m}{V}\\\Rightarrow \rho=\dfrac{28.5}{3.6}\\\Rightarrow \rho=7.92\ \text{g/cm}^3[/tex]

The density of iron is [tex]7.92\ \text{g/cm}^3[/tex]

10) m = Mass of silver = 2500 g

[tex]\rho[/tex] = Density of silver = [tex]10.5\ \text{g/cm}^3[/tex]

Volume is given by

[tex]V=\dfrac{m}{\rho}\\\Rightarrow V=\dfrac{2500}{10.5}\\\Rightarrow V=238.1\ \text{cm}^3[/tex]

The volume of silver is [tex]238.1\ \text{cm}^3[/tex]

Answer:

male= sperm cell

female= egg cell

together= embryo

Explanation:

Answer:

1. sperm

2. egg

3. zygote

Explanation I took this test and these are the correct answers because the third one above is not right.

Answer:

25038.72 mph (filler please ignore)

Answer:

Ignoring the effects of air resistance, the speed of gravity on Earth is 9.81 m/s 2.

Explanation:

Answer:

The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw = fλ, where vw is the speed of sound, f is its frequency, and λ is its wavelength. ... The frequency is the same as that of the source and is the number of waves that pass a point per unit time.

Explanation:

HOPE THIS HELPS ;}

Answer:

[tex] \boxed{ \bold{ \sf{Reference \: point}}}[/tex]

A place or object used for comparison to determine if something is in motion is called a reference point .

✎ Explanation :

A reference point can be defined as a fixed point / place / object from which we compare the motion of an object. For example :

Hope I helped!

Have a wonderful time ツ

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Answer:

decrease and neutralize each other

Explanation:

Answer:

The transfer of heat by the movement of fluid is called Convection Heat Transfer

Explanation:

Heat transfer by convection is the transfer of heat by fluid transport from one place to another, such that convection takes place when the heat that comes in contact of fluid containing body is moved to other parts of the container by the transporting fluid

Heat is transferred within a fluid medium mainly by convection (movement of heat by the transfer of fluid particles in the medium)

Convection heat transfer is a combination of conduction and advection heat transfer

Answer:

A) Troposphere

Explanation:

It is the lowest layer of the earth's atmosphere.

Answer: True

Explanation:

Mass is the amount of matter in an object. Everything is made up of matter.

Answer: true

Explanation: Matter is all the “stuff” that exists in the universe. It has both mass and volume. Mass measures the amount of matter in a substance or an object.

Answer:

2.61 J

Explanation:

Since potential energy U = mgy where m = mass of object, g = acceleration due to gravity = 9.8 m/s² and y = height of object above the ground.

Now for the coffee mug, m= 0.422 kg and it is 0.63 m on a table, so it is 0.63 m above the ground. Thus, y = 0.63 m.

We compute U

U = mgy

= 0.422 kg × 9.8 m/s² × 0.63 m

= 2.605 J

≅ 2.61 J

So, the potential energy of the mug with respect to the floor is 2.61 J

Answer:

Answer: Creating more wind farms results in a reduction of fossil fuel use

Explanation:

Economical improvement is to make earth a superior spot for everybody, without wrecking the opportunities for the following ages. There are numerous Eco frameworks that should be in equilibrium for us to live here, the atmosphere framework is one of them. This framework guarantees that the atmosphere is right and the air transmits the perfect measure of sunlight based energy. With the destructive nurseries gases, (for example, Carbon dioxide) we stop up the air, this progressions the temperature of the earth that can influence our turn of events  

How we use energy is extraordinarily significant. Oil and coal are tests of energy that we may run out of, utilizing energy that restore themselves (wind ranches) is useful for the planet. Wind, water and sun are maintainable.

Hope this Helps (✿◡‿◡)

Answer:

Answer: D.Creating more wind farms results in a reduction of fossil fuel use

Explanation:

Answer:

C

Explanation:

Centripital force points to the center.

Using Newton's second law we can know the direction of the force that creates the uniform circular motion, the correct answer is:

C) The force must go towards the center of the circle

Newton's second law establishes a linear relationship between force and mass of the body and its relationship is

           F = m a

The bold letters indicate vectors, where F is the force, m the mass that is a scalar and the acceleration of the body

By analyzing this expression we see that the direction of the net force and the acceleration are the same,

The uniform circular motion is characterized by having a speed, speed modulus, constant therefore in the movement the acceleration vector must be perpendicular to the speed so that the change is of direction only.

The acceleration must go towards the center of the circle and by Newton's second law the net force must also go towards the center of the circle.

Let's analyze the different strengths of the graph

a and d) Tangential force to the circle

    False. This force changes the modulus of the velocity so the movement stops being uniform circular

e) outward perpendicular force

   False. This force changes the direction of the velocity and maintains its modulus, but the antiparallel to the acceleration which contradicts Newton's second law

b) Force at an angle.

   False. This force can be decomposed into two vectors, one parallel and the other perpendicular to the circle, the parallel vector combines the speed modulus and the movement is elliptical.

c) Force towards the center of the circle.

    True. This force changes the direction of the velocity and maintains its modulus, in addition, the acceleration is in the direction of the change in velocity, which is why the particle describes the circle.

Using Newton's second law we can know the direction of the force that creates the uniform circular motion having the correct answer is:

c) The force must go towards the center of the circle

learn more about the centripetal force here:

https://brainly.com/question/14249440

Answer:

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

PE = 20 × 10 × 7

We have the final answer as

Hope this helps you

Answer:

C

Explanation:

The sun's radiation strikes the ground, thus warming the rocks. As the rock's temperature rises due to conduction, heat energy is released into the atmosphere, forming a bubble of air which is warmer than the surrounding air. This bubble of air rises into the atmosphere.

Answer:

A

Explanation:

It’s cold in the winter

hot in the summer

and in spring it’s warm

Answer:

The boat will go faster.

Explanation:

Answer:

The distance between the 2 centers of the object.

Explanation:

If it's harder to win a super bowl for the rams than the gravity means the chiefs will win it.

There are a total of 12 chairs in each row, and the scenario is represented by the equation 8c = 96.

Any mathematical statement that includes numbers, variables, and an arithmetic operation between them is known as an expression or algebraic expression. In the phrase 4m + 5, for instance, the terms 4m and 5 are separated from the variable m by the arithmetic sign +.

Given, there are 96 chairs and all Kayla wants there to be eight rows.

Let "c" be the number of chairs in each row,

Since there is a total of 96 chairs and 8 rows.

The equation for the situation is:

8 *c = 96

So,

In 8 rows there are a total number of chairs = 96

In each row, there are a total number of chairs = 96/8

In each row, there are a total number of chairs = 12

Therefore, the equation that represents the situation is 8c = 96 and there is a total of 12 chairs in each row.

Learn more about algebraic Expression here:

https://brainly.com/question/953809

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Answer:

electronegativity increases from left to right

Explanation:

took quiz

Answer: was it this problem?

Explanation:

Answer:

False

Explanation:

Answer:

C. Acceleration due to gravity

Explanation:

which is 9.8 m/s2 on Earth. The formula for calculating weight is F = m × 9.8 m/s2.

Answer:

Friction

Explanation:

This is because friction tends to oppose the motion of an object. Since the unbalance force or net force causes a motion of the object, the frictional force would tend to oppose the object until it is large enough to balance the net force. When this is done, equilibrium is achieved.

At this instance, there is no net force acting on the object.

So, the forces on the object become balanced and in a state of equilibrium.

Answer:

b i. The curve would be less steep than both of the graphs.

c. The temperature was the same at the start of the experiment so that the only variable changed in the experiment would be the thickness of the walls and the change in temperature can be measured from the same starting temperature, ensuring a fair experiment.

Explanation:

b i. Since you know that a thicker wall conducts heat from the inside room to the surroundings slower (based on my previous answer ;)), heat from the room would be conducted to the surroundings by the thicker wall slower and the temperature change will be less drastic and the graph would be less steep.

c. In an experiment, only one independent variable can be changed and we would normally record the dependent variable to get a conclusion for the experiment as the dependent variable is the variable that is affected by the independent variable. We should not change any other variable in the experiment, such as the starting temperature of the experiment.

For e.g. If you want to find out how the amount of water affects a plant's growth, the amount of water would be the independent variable and that would be the only thing you would change in that experiment. During the experiment, you would record the dependent variable, which is the height of the plant. The type of plants used and the type of soil..etc should be kept the same/constant so that it is a fair experiment, as a better type of soil may make the plant grow taller.

Answer:

The force needed to launch the projectile is 150000 N.

Explanation:  

We can find the force using the following equation:

[tex] F = ma [/tex]

Where:

m: is the mass = 15 kg

a: is the acceleration

First, we need to find the acceleration of the projectile:

[tex] v_{f}^{2} = v_{0}^{2} + 2ax [/tex]                          

Where:

[tex]v_{f}[/tex]: is the final speed

[tex]v_{0}[/tex]: is the initial speed = 0

x: is the distance = 2 m

The final speed is:

[tex]v_{f} = \frac{1 km}{5 s}*\frac{1000 m}{1 km} = 200 m/s[/tex]

Then, the acceleration is:

[tex]a = \frac{v_{f}^{2}}{2x} = \frac{(200 m/s)^{2}}{2*2 m} = 10000 m/s^{2}[/tex]

Finally, the force is:

[tex]F = ma = 15 kg*10000 m/s^{2} = 150000 N[/tex]

Therefore, the force needed to launch the projectile is 150000 N.

I hope it helps you!  

Answer:

(a) The acceleration of the train and cars is approximately 0.304 m/s²

(b) The tension between the locomotive and the car connected to the locomotive is approximately 0.4166 N

Explanation:

The given parameter are;

The mass of the toy locomotive = 0.979 kg

The mass of one car = 0.952 kg

The mass of the other car = 0.419 kg

The total mass of the train locomotive and cars = 0.979 + 0.952 + 0.419 = 2.35 kg

The weight of the train locomotive and cars = 9.81 m/s² × 2.35 kg = 23.0535 N

The normal force of the train and cars = The weight of the train locomotive and cars = 23.0535 N

The coefficient of dynamic friction = The normal force × The coefficient of dynamic friction

The coefficient of dynamic friction = 23.0535 × 0.110 = 2.535885 N

The applied force = 3.25

The net force acting on the train locomotive and cars = 3.25 - 2.535885 0.714115 N

(a) Force = Mass × Acceleration

Acceleration = Force/Mass

∴ The acceleration of the train and cars = 0.714115 N/(2.35 kg) ≈ 0.304 m/s²

(b) The tension between the locomotive and the car connected to the locomotive = T₂ = ( (m₁ + m₂)/ (m₁ + m₂ + m₃)) × F

Therefore, T₂ =  ( (0.952 + 0.419)/ (0.952 + 0.419 + 0.979)) × 0.714115 ≈ 0.4166 N.