What is the downward pull on an object due to gravity?

Answer:

Angle of incidence

Explanation:

The diagram shows the reflection of a light ray.

When a light ray undergoes reflection:

- The incident ray, the reflected ray and the normal to the surface all lie in the same plane

- The angle of reflection is equal to the angle of incidence

The two angles are defined as follows:

- The angle of incidence is the angle between the incident ray and the normal to the surface (1)

- The angle of reflection is the angle between the reflected ray and the normal to the surface

In the picture, we see that the angle marked with X corresponds to the angle defined in (1), so it is the angle of incidence.

Answer:

15

Explanation:

0N. The net force acting on this firework is 0.

The key to solve this problem is using the net force formula based on the diagram shown in the image. Fnet = F1 + F2.....Fn.

Based on the free-body diagram, we have:

The force of gases is Fgases = 9,452N

The force of the rocket Frocket = -9452

Then, the net force acting is:

Fnet = Fgases + Frocket

Fnet = 9,452N - 9,452N = 0N

Based on the free-body diagram, the net force acting on this firework is 0 Newton.

Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.

The mathematical expression for Newton's second law is as follows

F = m*a

where F represents the force applied

m is the mass of the object

a is the acceleration of the object

By using the equilibrium of the forces

The net horizontal forces acting on the firework should be zero.

as well the net vertical forces acting on the firework should be zero.

As there is no horizontal force acting on the rocket then the net horizontal force is already zero and has no significance in this problem.

Fh=0

For balancing the vertical force, the net vertical force on the firework is zero as both the upward force and downward force are equal in magnitude but opposite in direction.

Net vertical force= Net upward force - net downward force

                             = 9452-9452

                             =0 N

Thus, we can conclude on the basis of the free-body diagram, that the net force acting on this firework is 0 Newton.

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Answer:

A) 4.29%

Percentage error is 4.29%

Explanation:

From the experiment results;

The mass of water = 15.32 g - 14.65 g

                               = 0.67 g

Therefore;

The percentage error in the experiment will be given by;

 = (0.7-0.67)/0.7 × 100

 = 0.03/0.7 × 100

= 4.29%

Answer: The first option (ONE THAT HAS A HIGH LEVEL OF STIFFNESS   COMBINED WITH LOW DENSITY)

Explanation: Low density means volume is high compare to mass and stiffness is about hardness

Answer:

One that has a high level of stiffness combined with low density.

Explanation:

Velocity of wave in a solid = √ Y/σ ; Y is young's modulus of elasticity, or stiffness and σ is the density of the solid medium.

Answer:

480 mL

Explanation:

Ideal gas law states:

PV = nRT

At constant pressure, nR/P is constant.  Therefore:

V / T = V / T

420 mL / 220 K = V / 250 K

V ≈ 480 mL

Answer:

278m

Explanation:

A rock is projected upward from the surface of the moon, at time t = 0.0 s, with a velocity of The acceleration due to gravity at the surface of the moon is What is the maximum height of the rock above the surface?

The human brain is the body's control center, receiving and sending signals to other organs through the nervous system and through secreted hormones. It is responsible for our thoughts, feelings, memory storage and general perception of the world.

The human heart is a responsible for pumping blood throughout our body.

The job of the kidneys is to remove waste and extra fluid from the blood. The kidneys take urea out of the blood and combine it with water and other substances to make urine.

The liver has many functions, including detoxifying of harmful chemicals, breakdown of drugs, filtering of blood, secretion of bile and production of blood-clotting proteins.

The lungs are responsible for removing oxygen from the air we breathe and transferring it to our blood where it can be sent to our cells. The lungs also remove carbon dioxide, which we exhale.

Skin is important in creating a physical barrier to protect the body from pathogens.

FOOD PIPE, STOMACH.INTESTINES,ETC..

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Answer:

B. Wave B has greater intensity and transfer more energy.

Explanation:

Amplitude of wave B is more and it seems to be compact in less period of time as compared to Wave A.

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The answer is 12 ....

Answer:

Speed =

Explanation:

Speed = wavelength × frequency

Speed = 370 × 2.30 = 851m/s

Answer:

851 m/s

Explanation:

just got it right on edge

Answer:

Magneta is a mix of blue and red and is a secondary colour.

Explanation:

As we can see green is the complementary colour of Magneta.Complementary colours are the pairs of colours which when combined cancel each other out. This means that when combined they produce a grayscale colour like white or black .

The complementary colors are opposite on the color wheel, with green being the complement of magenta, yellow the complement of blue, and red the complement of cyan.

The complementary colors on a color wheel are those that are directly opposite to each other. When combined in the additive color system, they produce white light. The complementary color of magenta is green, as magenta is a mixture of blue and red, and green is the opposite of that combination on the color wheel. The complementary color of blue is yellow, which is a mixture of red and green. Lastly, the complementary color of cyan, which is a mixture of blue and green, is red.

Answer:00000000000

Explanation:00000000000 will never change sides cause it looks the same

Answer: Third option

F = 250w

Explanation:

The impulse can be written as the product of force for the time interval in which it is applied.

[tex]I = F (t_2-t_1)[/tex]

You can also write impulse I as the change of the linear momentum of the ball

[tex]I = mv_2 -mv_1[/tex]

So:

[tex]F (t_2-t_1) = mv_2 -mv_1[/tex]

We want to find the force applied to the ball. We know that

[tex](t_2-t_1) = 30[/tex] milliseconds = 0.03 seconds

The initial velocity [tex]v_1[/tex] is zero.

The final speed [tex]v_2 = 73.14\ m / s[/tex]

So

[tex]F * 0.03 = 73.14m[/tex]

[tex]F * 0.03 = 73.14m\\\\F=\frac{73.14m}{0.03}\\\\F=2438m[/tex]

We must express the result of the force in terms of the weight of the ball.

We divide the expression between the acceleration of gravity

[tex]g = 9.8\ m / s ^ 2[/tex]

[tex]F=\frac{2438m*g}{g},\ \ m*g=w\\\\g=9.8\ m/s^2\\\\F=\frac{2438w}{9.8}\\\\F=249w[/tex]

The answer is the third option

The average force exerted on the tennis ball during the serve in terms of its weight is closest to 250w, calculated using the equations of motion and Newton's second law.

In this case, the initial velocity is 0 m/s, and the final velocity is 73.14 m/s, with the ball in contact with the racquet for 30 milliseconds (0.03 seconds). The ball's weight w is the product of its mass m and the acceleration due to gravity g (w = mg).

First, we calculate the acceleration a using the equation:

a = (v - u) / t

where v is the final velocity, u is the initial velocity, and t is the time. Substituting the known values, we get:

a = (73.14 m/s - 0 m/s) / 0.03 s = 2438 m/s2

Now, to find the force F exerted on the ball, we use Newton's second law F = ma. However, we want F in terms of the ball's weight w. We know w = mg and F = ma, and by substituting for m from w, we get:

F = (w/g)a

Substituting for a and the acceleration due to gravity (approximately 9.81 m/s2), we find:

F = (w/9.81 m/s2)(2438 m/s2) = 248.72w

Therefore, the average force exerted on the ball in terms of its weight is closest to 250w.

Answer:

You will need 7.953 kJ heat energy to raise the temperature of water from 277K to 315K.

Explanation:

To calculate how much heat is needed to raise the temperature of any substance, you need:

The mass of the substance,  m, which for you is 50.0 g

The temperature change that occurs,  ΔT, which for you is:

Δ[tex]T=(315-277)K=38K[/tex]

The specific heat capacity of the substance,  c,

For water, the value of  c  is  4.186J/gK

Then, this is the equation you need:

[tex]Q=mc[/tex]ΔT

Where Q is the heat needed

So,  

[tex]Q=(50.0g)(4.186J/gK)(38K)=7953.4J=7.9534kJ[/tex]

You need 7.953 kJ to raise the temperature of water from 277K to 315K.

The heat required to raise the temperature of 50.0 g of water from 277 K to 315 K is 7964 joules, using the specific heat capacity of water, which is 4.18 J/g°C and the formula Q = mcΔT.

To calculate the amount of heat required to raise the temperature of water, we use the specific heat capacity of water, which is 4.18 J/g°C. The formula we'll use is Q = mcΔT, where Q is the heat energy, m is the mass of the water, c is the specific heat capacity, and ΔT is the change in temperature.

For 50.0 g of water being heated from 277 K to 315 K, the change in temperature (ΔT) is (315 K - 277 K) = 38 K. Since the Kelvin and Celsius scales are offset by a constant but rise at the same rate, an increase of 1 K is equivalent to an increase of 1 °C. Therefore, the heat energy required can be calculated as follows:

Q = mcΔT
Q = (50.0 g) × (4.18 J/g°C) × (38 °C)
Q = 7964 J

Therefore, 7964 joules of heat energy is needed to raise the temperature of 50.0 g of water from 277 K to 315 K.

Answer:

A) The absence of fossils of warm-weather plants

Explanation:

During the later stages of the Cretaceous period, the climate started to change. From the predominantly warm, tropical and subtropical, the climate started to have more variations, with mountainous climates starting to develop, as well as temperate climate types. This was caused by the movement of the tectonic plates, as it cause lot of changes in the landscape, positions of the continents, movement of the ocean currents, movement of the air masses. One indicator that the climate cooled down is that the fossils of tropical plants are lacking in most of the planet, and they are only limited to the lowest latitudes, while fossils from plants that are much better suited to temperate climates and colder climate are dominating.

Answer:

The absence of fossils of warm-weather plants might cause them to believe that the Earth grew cooler during this time. Tropical plants would not survive in cold temperatures.

Answer:

The magnitude of the electric field is 800 N/C and the direction is positive and points to the right.

Explanation:

Ok, here is the explanation:

The magnitude of the electric field is simply defined as the force per charge on the test charge:

[tex]electric field strength=\frac{force}{charge}[/tex]

If the electric field strength is denoted by the symbol E, then the equation can be rewritten in symbolic form as:

[tex]E=\frac{F}{q}[/tex]

and this is the equation we are going to use to solve the problem

We have: E=?, q=+50μC and F=0.040N

We know that 1C=1x10-6 μC so 50μC is equal to 5x10-5 C or 0.00005 C

Then we use the equation as follows:

[tex]E=\frac{0.040}{+0.00005} =800 \frac{N}{C}[/tex]

Because the charge is positive and also the force applied, so will the electric field. And since the force points to the right, the electric field as a vector points to the right.

Answer:

D. Plane of orbital rotation

Explanation:

The orbital plane of an object orbiting around another is the geometric plane that contains the orbit in question.

By definition, the inclination of a planet in the solar system is the angle between the orbital plane of the solar system and the orbital plane of the Earth.

Final answer:

The plane that all the planets in Earth's solar system must follow is known as the plane of the ecliptic (option A), which is approximately the same plane as Earth's orbit around the Sun.

Explanation:

The plane that all the planets in Earth's solar system must follow is called the plane of the ecliptic. This plane extends through the center of the Sun and the orbit of the Earth. All the planets revolve around the Sun approximately in this plane, and the Earth's axis of rotation is tilted at about 23.5° from being perpendicular to the ecliptic plane. As a result, Earth's rotational axis remains parallel to its previous position as it orbits around the Sun. Conversely, the so-called invariable plane, as discovered by La Place in 1784, is one where the angular momentum vector of the solar system remains constant and is not influenced by the planetary motions. However, for practical purposes, as observed from Earth, the ecliptic is the apparent path of the Sun and planets across the sky.

1. A. The relative motion between Earth and the Sun

The Earth is constantly moving, be it around its own axis, or around the Sun. As it moves around the Sun over the course of one year, the Earth changes its relative position toward the constellations. This results in different positions of the constellations in different periods of the year, when it comes to viewing them from the Earth of course. It looks for the ordinary observer that the constellations are making lot of movement throughout the year and change their positions, and they do move, just not in that manner, but in fact it is the relative motion between the Earth and the Sun that gives that effect on the night sky.

2. A. Interstellar medium

The galaxies are composed of multiple basic things, with the stars and the interstellar medium being the dominant ones. Apart from these two there are also gases and dust. The galaxies are massive, and even the smallest of them are so big that we can not even imagine in our minds as we don't have a scale in our minds for something so large. They have trillions of stars in them, and the majority of the space between the stars is filled with interstellar medium.

3. B. Expand

The Big Bang theory is the most widely accepted theory about the formation of the universe, even though it doesn't really has proper explanations for certain things. This theory suggests that everything managed to get dragged into a single miniature spot and once the gravity became way to big, an explosion occurred. This explosion was so big, and everything moved so quickly, that in literary thousands of parts of a second millions of light years of space were filled in. Everything was practically expanding from the spot of explosion, expanding outwards, giving the basis for the formation of everything we see in the universe. The process of expanding is still continuing, as we can see with the quasars, and it is expected to do so in the future.

4. C. Low-mass main sequence

From what has been observed from the space until now, it seems that the low-mass main sequence stars are the once that dominate the universe by far, at least in numbers. These stars are also called red dwarfs. They are small stars, having reddish color, and their mass is also relatively low compared to the bigger stars. It is estimated that around three quarters of the stars are actually of this type. Unfortunately, because they are small and their low luminosity, individual stars of this type can not be seen from the Earth with naked eye.

5. A. Rocky

The terrestrial planets are planets that are small in size. They are closer to the Sun, thus they are warmer because of it. Unlike their Jovian counterparts, the terrestrial planets tend to be denser, but also what is a striking distinction is that they are rocky. These planets have rocky surfaces, thus their surfaces are solid, covered with numerous types of geologic features, while the Jovian do not have rocky surface, but instead it is gaseous or icy. The fact that these planets are rocky, also gave big advantage to them when it came to providing conditions for life, and the Earth was the lucky one that had all other things in place and boomed with life.

6. B. The Moon's gravity pulls on Earth's oceans, causing tides

The Moon is very close to the Earth, and it is actually a very large moon for the size of the Earth. It has its own gravity of course, and the sheer proximity means that it will influence on something. Since the gravitational pull of the Earth is stronger, the gravitational pull of the Moon can not do something spectacular, but at least it manages to pull the ocean waters. As it pulls the ocean waters, the Moon's gravity actually cause the high tides and low tides.

Final answer:

The different constellations visible during the year result from Earth's motion around the sun. Galaxies contain interstellar medium alongside stars. After the Big Bang, the universe began expanding. Low-mass main sequence stars are the most common. Terrestrial planets are rocky and affected by the moon's gravitational pull, which causes tides.

Explanation:

Different constellations are visible at different times of year because of A. The relative motion between Earth and the sun.

A galaxy is composed of stars and A. Interstellar medium.

Once the Big Bang occurred, everything in the universe started to B. Expand.

The most common stars are C. Low-mass main sequence stars.

Unlike Jovian planets, the terrestrial planets are small, dense, and A. Rocky.

The gravitational force of the moon affects Earth as B. The moon's gravity pulls on Earth's oceans, causing tides.

Answer:

EFFECTS: ( doughts)

EFFECTS:( FLOODS)

How to prevent from flooding is :

How to prevent from droughts :

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Answer:

C

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The statements ‘Sound insulators prevent sound from being transmitted better than elastic solids' is true of sound transmission through various mediums.

Answer: Option C

Explanation:

The sound insulators are the better way to prevent sound from being transmitted than elastic solids as they have a higher tendency to absorb sound waves than the elastic solids. A good sound insulation is considered in the range of 45 dB.

Mineral wool, rock wool, fibreglass etc are the best to be fit in between the studs of the walls. They absorb the sound waves and help reducing the transmission of sound from the walls, windows, fences, etc.

Answer:

medium. A medium is the intervening substance through which impressions are conveyed to the senses or a force acts on objects at a distance.

i believe its mild winters

Answer:

Very hot summers.

Explanation:

The temperature of the Daytona Beach of FL is mostly varies within the range of 50° F to 89° F and this temperature is rarely go below 36°F and rarely go above 93°F.

The summers of the Daytona Beach is very long, and the days are very cloudy and hot.

And the winters are very short and the are partly cloudy and warm.

Answer:

1. Electric current

2. In fact it is electrons that flow through a metallic conductor, and they flow from the negative terminal to the positive terminal

3. Series and parallel

4. Series

5. Parallel

6.

7.

8.A fuse is a small, thin conductor designed to melt and separate into two pieces for the purpose of breaking a circuit in the event of excessive current. A circuit breaker is a specially designed switch that automatically opens to interrupt circuit current in the event of an overcurrent condition.

9.

10. The power of batteries in a circuit. The key functions of a battery and bulb in a circuit are explained. A battery is a source of energy which provides a push - a voltage - of energy to get the current flowing in a circuit. A bulb uses the electrical energy provided by the battery, but does not use current.

The flow of electrons through wires and components is known as electric current.

Electricity is defined as a form of energy occurring naturally due to motion and interactions of electrons.

Here,

1. The flow of electrons through wires and components is known as electric current. Or simply, electric current is the rate of flow of charge.

2. Since, the electrons are attracted to the positive terminal of the battery, they move from the negative to the positive terminal of the battery.

The direction of conventional flow of current is taken opposite to the flow of electrons. Thus electric current flows from positive terminal to the negative terminal of the battery. So, it is true.

3. The two main types of circuits are series and parallel.

4. The  type of circuit in which there is only one path for an electric current to flow is known as a series circuit.

5. The type of circuit would allow an electric current to continue to flow even if a single path is broken is a parallel circuit.

6. The diagram of a series circuit is attached.

7.  R' = 3 Ω  

 The equivalent resistance of the 4 resistors,

   R(eff) = 4R' = 4 x 3

   R(eff) = 12 Ω  

8. The purpose of fuses and circuit breakers is to protect equipment by stopping the flow of electric current.

9. The symbol represents the cell in a circuit diagram.

10. The purpose of a cell (battery) is to store chemical energy and transfer it to electrical energy when a circuit is connected.

Hence,

The flow of electrons through wires and components is known as electric current.

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Your question was incomplete. Attaching the image here.

Answer:The first one , option a

Explanation:

Answer:

A. First one with Sun at the center.

Explanation:

Aristarchus was a Greek scientist who proposed the theory that its not Earth which is fixed, its the Sun that has a fixed position and is placed at center where are all other planets are located at some distance from it and revolve around it.

This theory is referred as "Heliocentric".  His theories were even attributed by Nicolaus Copernicus and was even know as Copernicus heliocentrism.

that would be given by

f=@N

@ representing coefficient of kinetic friction.

thus 19.5/51.7 = 0.377

Length contraction causes an object moving at a significant fraction of the speed of light to appear shorter along its direction of motion to an outside observer, and when the object stops, it returns to its original length.

According to the concept of length contraction, the length of an object as it approaches the speed of light, observed by someone in a different rest frame, contracts or shortens in the direction of motion. When the object slows down and eventually comes to a stop, it is observed to expand back to its original length. The correct phenomenon that occurs is that it is observed as contracting and then expanding back to its original length.

I think the answer should be the last one. Magnets attract magnets with unlike poles and repel magnets with like poles

Answer:

Explanation:

1. cools quickly on the earth's surface

Extrusive igneous rock

2. cools slowly beneath the earth's surface

Intrusive igneous rock

3. formed from the remains of living organisms

Organic sedimentary rocks

4. formed from pieces of other rocks cemented together

Clastic sedimentary rock

5. formed when dissolved minerals harden

Chemical sedimentary rock

6. formed from heat and pressure

Metamorphic rocks

Answer:

1- Extrusive igneous rock

2- Intrusive igneous rock

3- Organic sedimentary rocks

4- Clastic sedimentary rocks

5- Chemical sedimentary rock

6- Metamorphic rock

Explanation:

Extrusive igneous rock- This are the igneous rocks that are formed when magma ejects out to the surface and quickly solidifies. Since they comes out to the surface, so they are considered to be extrusive igneous rocks. This type of rocks are comprised of smaller crystals due to the faster rate of cooling. For example, basalt.

Intrusive igneous rock- This are the type of igneous rocks that are formed due to the crystallization of magma at a certain depth. This rocks are made up of coarser crystals due to the slow rate of cooling. For example, granite.

Organic sedimentary rocks- This are the type of sedimentary rocks that are comprised of fossil or organic compound. These fossils are trapped about millions of years back. This type of rocks containing fossils are important for determining the past environment, climate and food habitat of these fossil organisms. For example Limestone.

Clastic sedimentary rocks- This are the sedimentary rocks that are formed from the compaction and lithification of loose sediments or broken rock materials. For example, sandstone.

Chemical sedimentary rock- This are the type of sedimentary rocks that are formed from the minerals (crystals). This minerals are made up of the elements that undergoes dissolution in water. For example, oolitic limestone.

Metamorphic rock- This are the secondary rock, either derived from the igneous, sedimentary or other metamorphic rock. These rocks are formed due to the extreme pressure, temperature condition. They are also known as the secondary rocks. For example, Quartzite.

Answer:

2.5 kg

Explanation:

We can solve the problem by using Newton's second law:

[tex]F=ma[/tex]

where

F is the net force acting on the train

m is the mass of the train

a is the acceleration

For the toy train in the problem,

F = 3.0 N

a = 1.2 m/s^2

So we can solve the formula for m, to find the mass of the train:

[tex]m=\frac{F}{a}=\frac{3.0 N}{1.2 m/s^2}=2.5 kg[/tex]

Answer:

2.5

Explanation: