pls do question 1 part d). tysm

Answer:

The acceleration of the skateboarder is 2.067 m/s²

Explanation:

Given;

initial velocity of the  skateboarder, u = 0.8 m/s

final velocity of the  skateboarder, v = 7 m/s

time of motion, t = 3 s

The acceleration of the skateboarder is given as;

[tex]a = \frac{v-u}{t}\\\\a = \frac{7-0.8}{3}\\\\a = 2.067 \ m/s^2[/tex]

Therefore, the acceleration of the skateboarder is 2.067 m/s²

Answer:

Valence electrons are electrons that tend to stay in the highest energy levels of an atom and are involved in chemical bonding.

Answer:Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair. ... Most atoms do not have eight electrons in their valence electron shell.

Explanation:

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Answer:

a=3.53 m/s^2

Explanation:

Vo=0 m/s (because he is not moving at the start)

V1=15 m/s

t= 4.25 s

a = (V1-Vo) / t = 15/4.25 = 3.53 m/s^2

Answer:

magnetic trains works at the principle of repel on of the advantage is that they are fast and dont really need diesel

Answer:

Winds blow away from high pressure. Swirling in the opposite direction from a low pressure system, the winds of a high pressure system rotate clockwise north of the equator and counterclockwise south of the equator. This is called anticyclonic flow.

Explanation:

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Answer:

Atoms move more freely in the gas state.

Explanation:

e2020

A substance is hotter in the gas state than in the liquid state because atoms move more freely in the gas state.

The term "temperature" describes how hot or cold a body is. It is, specifically, a method of calculating the kinetic energy of the particles that make up an item. When particles move more quickly, the temperature rises, and vice versa.

Nearly every aspect of our daily lives and all scientific fields, from physics to geology, are significantly influenced by temperature.

The average kinetic energy of the particles in an object is measured by its temperature. The velocity of these particles likewise increases as the temperature rises.

As atoms move more freely in the gas state, a substance is hotter in the gas state than in the liquid state.

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Answer:

Malleability

Explanation:

The ability to roll aluminum foil in a ball is the property of metal called malleability.

Answer:

h = 38.41 m

Explanation:

Given that,

A ball is thrown horizontally from the top of a building and strikes the sidewalk after 2.8 s.

We need to find the height of the building. Let it is h.

Initial speed of the ball, u = 0

Using second equation of motion to find h as follows :

[tex]h=ut+\dfrac{1}{2}at^2\\\\\text{Put u = 0 and a = g}\\\\h=\dfrac{1}{2}gt^2\\\\=\dfrac{1}{2}\times 9.8\times 2.8^2\\\\=38.41\ m[/tex]

So, the building is 38.41 m tall.

Answer:

Along the Atlantic and Gulf Coasts of Florida, the land surface is also sinking. If the oceans and atmosphere continue to warm, sea level along the Florida coast is likely to rise one to four feet in the next century. Rising sea level submerges wetlands and dry land, erodes beaches, and exacerbates coastal flooding.

Explanation:

Answer:

10 seconds

Explanation:

Answer:

In an unusual move by the New York State Department of Transportation, all of the "speed limit" signs were replaced with "velocity limit" signs

The devices are called as 'Speedometer' and not 'Velocity meters' because speedometer only gives the magnitude of the speed but not direction while velocity is vector quantity which will show speed as well as direction of the vehicle. Such signs could possibly look like ' Maximum legally permissible strength of velocity for forward progress is 30'  

Once can definitely travel faster using velocity meter than the old speed limit, it is because c=velocity includes displacement as it is vector. Hence it will allow the passengers to move in straight path without moving here and there on the road and it will help them reach their destination much faster than the old method without violating the rules.

Answer:

Explanation:

KHAN ACADEMY

Free body diagram of a block of cheese is sliding up an inclined surface that is not smooth is shown in the diagram.

A graphic, dematerialized, symbolic representation of the body (a structure, element, or fragment of an element) in which all connecting "parts" have been eliminated is known as a free-body diagram.

Force acting on the block is F in upward direction and frictional force acting on the body in opposite to the motion is f. and weight of the body is mg. and normal reaction of the body is R = mgsinθ. where, θ is angle of inclination of the surface.

Then, free body diagram is according to the figure.

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Answer:

Biomass-Total of mass of organisms in a given area/volume

Biofuel-A fuel directly from living matter.

Answer:

m hundred percent sure c

Answer:

55.80s

Explanation:

Power is calculated using the expression

Power = Work done/Time

Workdone= Force ×distance

Workdone = 794×22

Work done = 17468Joules

From the power formula

Time = Workdone/Power

Time = 17468/313

Time = 55.80seconds

The elevator takes 55.80seconds to life the Taylor

Answer:

The first one is 3 m/s

The second one is 2 m/s

Explanation:

Answer:

first one is

-2

Second one

0

Explanation:

trust me

Answer:

Conduction occurs when a substance is heated, particles will gain more energy, and vibrate more. These molecules then bump into nearby particles and transfer some of their energy to them. This then continues and passes the energy from the hot end down to the colder end of the substance.

Explanation:

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Answer:

They are 7.4m apart.

Explanation:

I got the Feds 12.6 m ahead of the crooks when both boats hit the water under the falls.

Answer:

A supply of compressed air is maintained aboard the submarine in air flasks for life support and for use with the ballast tanks. In addition, the submarine has movable sets of short "wings" called hydroplanes on the stern (back) that help to control the angle of the dive.

Explanation:

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Complete Question

Planet D has a semi-major axis = 60 AU and an orbital period of 18.164 days. A piece of rocky debris in space has a semi major axis of 45.0 AU.  What is its orbital period?

Answer:

The value  is  [tex]T_R = 11.8 \ days[/tex]  

Explanation:

From the question we are told that

   The semi - major axis of the rocky debris  [tex]a_R = 45.0\ AU[/tex]

   The semi - major axis of  Planet D is  [tex]a_D = 60 \ AU[/tex]

    The orbital  period of planet D is  [tex]T_D = 18.164 \ days[/tex]

Generally from Kepler third law

          [tex]T \ \ \alpha \ \ a^{\frac{3}{2} }[/tex]

Here T is the  orbital period  while a is the semi major axis

So  

        [tex]\frac{T_D}{T_R} = \frac{a^{\frac{3}{2} }}{a_R^{\frac{3}{2} }}[/tex]

=>     [tex]T_R = T_D * [\frac{a_R}{a_D} ]^{\frac{3}{2} }[/tex]  

=>     [tex]T_R = 18.164 * [\frac{ 45}{60} ]^{\frac{3}{2} }[/tex]

=>      [tex]T_R = 11.8 \ days[/tex]  

The orbital period of the rocky debris in space is 12 days.

From Kepler's law, we know that the square of the period of a planet in years is equal to the cube of its mean distance from the sun in astronomical units (AU).

Mathematically;

[tex]T^2 = r^3[/tex]

Now, we have the mean distance as 45.0 AU, we need to obtain its period.

semi major axis of debris rR= 45.0 AU

semi major axis of planet D rD = 60 AU

Period of planet D  TD  = 18.164 days

Period of debris TR = ?

[tex]\frac{TR^2}{TD^2} = \frac{rR^3}{rD^3}[/tex]

[tex]\frac{rR^3}{rD^3} * TD^2[/tex]

[tex]TR^2 = 45^3/60^3 * 18.164^2[/tex]

TR = 12 days

Missing parts:

Planet D has a semi-major axis = 60 AU and an orbital period of 18.164 days. A piece of rocky debris in space has a semi major axis of 45.0 AU.  What is its orbital period?

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Answer:

D. Heating water to a rolling boil

Answer:

A

Explanation:

Answer:

60Watts

Explanation:

Given parameters:

Current = 0.5A

Voltage  = 120V

Unknown

Power = ?

Solution:

The power in the electric circuit is the product of current and voltage;

      P = IV

Insert the given parameters and solve;

      P = 0.5 x 120

      P  = 60Watts

Answer:

12.6 g

Explanation:

Since it has a half life of 10 years and the question asks for 30 years all you need to do is divide 100 in half 3 times

Answer:

B.

Explanation:

In a scientific context, “pure” denotes a single type of material. Ostensibly, compounds contain more than one type of material. Yet both compounds and elements are considered pure substances. Pure compounds are created when elements combine permanently, forming one substance.