A car traveling initially at a speed of 20 m/s accelerates to a speed of 31 m/s over a distance of 45 meters.
What is the magnitude of the car's acceleration?

Answer:

Birds and fish both have a backbone structure, which makes them structurally and functionally similar.

Explanation:

A 20 year old biology student has been working in a nightclub as a DJ to earn money to pay for her education. After several months, she notices that she is having problems hearing high-pitched tones therefore the following which is most probable is that she is experiencing symptoms of perforated eardrum which is denoted as option A.

This is referred to as a thin flap of skin that stretches tight like a drum and vibrates when sound hits it.

It can be damaged when an individual is exposed to constant loud sounds and in this scenario we were told she worked in a nightclub which may be as a result of the loud music and is characterized by hearing loss therefore she has problems hearing high-pitched tones.

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The full question:

A 20 year old biology student has been working in a nightclub as a DJ to earn money to pay for her education. After several months, she notices that she is having problems hearing high-pitched tones. Which of the following is most probable?

A. She is experiencing symptoms from a perforated eardrum. B. She is experiencing symptoms from otitis media. C. She is experiencing symptoms from damage to structures in the inner ear. D. She is experiencing symptoms of otosclerosis. E. What she is experiencing is quite normal and she should not worry about it.

Answer:

one of the object is at rest after the collision

According to the physics professor's acceleration vs. time graph, a change in speed could also mean a change in velocity.

An object's velocity may alter depending on whether it is moving faster, slower, or in a different direction. The moon orbiting the earth and an apple falling to the ground are two instances of acceleration.

The pace at which displacement changes is known as velocity. The rate at which velocity changes is known as acceleration. Because it includes both magnitude and direction, mass and velocity quantity. Since acceleration is merely the rate at which velocity changes, acceleration is likewise a vector quantity.

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Elements combine to form compounds. The correct answer is A.

Elements combine with each other in chemical reactions to form compounds. A compound is a substance composed of two or more different elements chemically combined in a fixed ratio by mass. For example, water is a compound composed of hydrogen and oxygen in a fixed ratio of 2:1 by mass.

B. Molecules are formed when two or more atoms combine chemically, but these atoms can be of the same element or different elements. For example, oxygen gas (O2) is a molecule composed of two oxygen atoms.

C. Atoms are the smallest unit of matter that retains the properties of an element. Atoms do not combine to form other atoms or compounds.

D. Mixtures are composed of two or more substances physically mixed together, but the substances retain their individual properties and can be separated by physical means. Mixtures are not formed by the chemical combination of elements. Examples of mixtures include air and saltwater.

Therefore, The correct answer is option A.

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Given,

The distance travelled by train, d=2650 km=2650×10³ m

The time interval in which the train covers the total distance, t=9.00-2.00=7.00 hrs

That is, t=7×3600 s=25200 s

The average speed is given by the ratio of total distance travelled to the total time duration.

That is,

On substituting the known values,

Thus the average speed of the train is 105.16 m/s

The reflection law allows us to find that the correct statement for  where a ray is located in a concave mirror is:

Geometric optics studies the geometric properties of light rays by surfaces. It has two laws that describe it:

                     \(\theta_i = \theta_r\)

Now we can analyze the expressions.

a) False. This only happens if the object is at infinity

b) True. This is the law of reflection that the angles are equal and it always complies

c) False the optical axis is a perpedicular line to the mirror, therefore the ray must be parallel to the mirror and is not reflected.

In conclusion using the reflection law we can find which statement is correct

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Answer: I think you have the correct answer. (I think it is false.)

Explanation: The Earth's magnetic field is mostly caused by electric currents in the liquid outer core. The Earth's core is hotter than 1043 K, the Curie point temperature above which the orientations of spins within iron become randomized. Such randomization causes the substance to lose its magnetization.

Answer:

The car furthest from the finish line: Car III (Choice C).

Explanation:

It's asking for lowest average speed throughout the entire race. Therefore, whoever is last technically has the lowest average speed.

Car III is far behind Car I and Car II so Choice A and B aren't correct. Choice D is incorrect since the three cars aren't in the same position. Choice E is incorrect because there is enough information to see that Choice C has the lowest average speed.

Explanation:

To determine the effort needed to lift a load of 200N, given a velocity ratio of 5 and an efficiency of 80%, we can use the formula:

Efficiency = (Output Work / Input Work) * 100

Efficiency can also be calculated as the ratio of the output force to the input force. In this case, the output force is the load being lifted (200N), and the input force is the effort required.

Given that the velocity ratio is 5, it means that for every 5 units of distance the effort moves, the load moves 1 unit of distance. This implies that the effort is exerted over a greater distance than the load.

Let's denote the effort force as "E" and the distance moved by the effort as "dE." Similarly, the load force is "L," and the distance moved by the load is "dL."

Using the velocity ratio, we have the following relationship:

dE / dL = 5

Now, we can calculate the input work (Wi) and the output work (Wo):

Input Work (Wi) = Effort (E) * Distance moved by the effort (dE)

Output Work (Wo) = Load (L) * Distance moved by the load (dL)

Given that the efficiency is 80%, we can rewrite the formula for efficiency as:

0.80 = (Wo / Wi) * 100

Now, let's solve for the effort (E) using the given values:

Load (L) = 200N

Efficiency = 0.80

Velocity Ratio = 5

First, calculate the output work (Wo):

Wo = Load (L) * Distance moved by the load (dL)

Since the velocity ratio is 5, the distance moved by the load (dL) will be 1/5 of the distance moved by the effort (dE):

dL = (1/5) * dE

Wo = L * (1/5) * dE

Wo = 200N * (1/5) * dE

Wo = 40N * dE

Next, calculate the input work (Wi):

Wi = Effort (E) * Distance moved by the effort (dE)

Wi = E * dE

Now, substitute the values into the efficiency formula:

0.80 = (Wo / Wi) * 100

0.80 = (40N * dE) / (E * dE) * 100

0.80 = 40 / E * 100

0.80 * E = 40

E = 40 / 0.80

E = 50N

Therefore, the effort needed to lift a load of 200N with a velocity ratio of 5 and an efficiency of 80% is 50N.

Answer:

i cant make funny joke

Explanation:

but i can be alive.

wait no, im failing at that currently.

Answer:

0%

Explanation:

There is no purple geneotype with either parents so there will be 0 purple and 100% white

Answer:

10 metres west

Explanation:

10 to the west is the answer

Answer:

B

Explanation:

-10+20= 10

An example of energy transformation of chemical to thermal to light to sound is Crackling fireplace.

Energy transformation, which we also know as energy conversion, is described as the process of changing energy from one form to another. Energy is a quantity that provides the capacity to perform work or moving, or provides heat.

A Crackling fireplace starts the process of energy transformation from being a chemical to thermal \via heat and then makes a sound.

When an explosive goes off, chemical energy that was stored in it is changed and transferred into sound energy, kinetic energy, and thermal energy.

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Example of energy transformation of chemical to thermal to light to sound is a Crackling fireplace.

Energy transformation which is also know as energy conversion is described as the changing of energy from one form to another. Energy is a quantity that provides the capacity to perform work or moving, or provides heat.

A Crackling fireplace starts the process of energy transformation from being a chemical to thermal through heat and then makes the crackling sound.

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Answer:

Explanation:

KE= ½mv²

m = 2KE/v²

m = 2(106)/2.01²

m = 52.47394...

m = 52.5 kg

The mass of the ball will be equal to m= 0.05 kg

Kinetic energy is the energy of motion. An object that has motion - whether it is vertical or horizontal motion - has kinetic energy. There are many forms of kinetic energy - vibrational (the energy due to vibrational motion), rotational (the energy due to rotational motion), and translational

The formula for kinetic energy will be given as

\(\rm KE=\dfrac{1}{2}mv^2\)

It is given that

KE= 106 J=0.106 KJ

Velocity= 2.01 m/s

So the mass will be

\(0.106=\dfrac{1}{2}m(2.01)^2\)

\(m=\dfrac{0.106\times 2}{(2.01)^2}\)

\(m=0.05 \ kg\)

Thus the mass of the ball will be equal to m= 0.05 kg

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Answer: 12

Explanation: 34

To convert 813 into grams if it is already in grams, then the value remains as 813 grams. If it is in pounds, 813 pounds would be approximately 368,646.696 grams. If it is in kilograms, 813 kilograms would be equal to 813,000 grams.

To convert 813 into grams, we need to know the unit of measurement you're referring to. Grams are typically used to measure the weight of objects, but without additional context, it's difficult to provide an accurate answer.

If you are referring to 813 grams, then the conversion is straightforward, as it is already in grams.

If you are referring to another unit, such as pounds or kilograms, we can convert it to grams:

If you meant 813 pounds, one pound is approximately equal to 453.592 grams. Therefore, 813 pounds would be approximately 368,646.696 grams.

If you meant 813 kilograms, one kilogram is equal to 1,000 grams. Therefore, 813 kilograms would be equal to 813,000 grams.

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If I had the opportunity to travel in time and take a single technological device to the past, I would take one of these devices;

Many would be the technological devices that would take to the past, some of the main ones would be:

¡Hope this helped!

A ten kilo gram satellite completes- are revolution round the earth ata' height one hundred Kilometer in one hundred eight minutes the work done by gravitational force of earth will be​ zero.

Work is defined as the amount of energy required to move an object in a particular direction.

When a force moves an object in the same direction, it performs positive work.

Negative work is performed when an object is moved in the opposite direction of a force, or when the force and motion are perpendicular.

No work is performed when the applied force and motion are perpendicular.

W = Fd cos theta is the formula for work.

Where F is force, d is distance, and theta is the angle between the force and distance.

What is the work done by gravitational force on the satellite?

According to Newton's Law of Gravitation, the gravitational force acting on a body is given by F = (GMm)/r^2, where G is the gravitational constant, M and m are the masses of the two objects, and r is the distance between them.

The work done by a gravitational force on a satellite moving around the Earth is negative.

The gravitational force acts towards the center of the Earth, while the displacement of the satellite is perpendicular to it.

As a result, the work done by gravity on the satellite is zero.

Why is the work done by gravity zero?

Because work is done when a force acts on an object and causes it to move.

If the force is perpendicular to the motion, it does no work.

In the case of the satellite, the force of gravity is acting towards the center of the Earth, while the satellite's motion is perpendicular to it.

As a result, the work done by gravity on the satellite is zero.

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The volume and the density of the piece of metal are 3×10⁻⁵ m³ and 6666.67 kg/m³ respectively.

Density can be defined as the ratio of mass and volume of an object.

To calculate the volume of the metal piece, we use the formula below.

Formula:

Where:

Note: Recall from Archimedes' principle that an object will displace a volume of water that is equal to his own volume.

Make V the subject of the equation

From the question,

Given:

Substitute these values into equation 2

To calculate the density of the metal piece, we use the formula below

Formula:

Where:

Given:

Substitute these values into equation 3

Hence, The volume and the density of the piece of metal are 3×10⁻⁵ m³ and 6666.67 kg/m³ respectively.

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The work may be determined if the force acting on an object stays constant by multiplying the length of the path by the force component acting along the path. The amount of work done, W, is therefore equal to F (force) times the distance.

Anytime a force transports something over a distance, work is performed. By multiplying the force by the distance moved in the direction of the force, you may determine the amount of energy transferred or work accomplished.

Therefore, Force multiplied by the distance travelled in the force's direction equals work done, or energy transferred.

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Answer:

3.456 × 10^(8) m

Explanation:

We are given;

Mass of earth; m_e = 5.98 × 10^(24) kg

Mass of moon; m_m = 7.36 × 10^(22) kg

Distance from earth to moon; L = 3.84 × 10^(8) m.

We are told that the Moon’s gravitational pull is stronger than that of Earth’s.

Thus;

F_EA ≤ F_MA

Formula for force due to gravity is;

F = GMm/r²

Applying to this question, we have;

(Gm_e•m_a)/x² ≤ (Gm_m•m_a)/(l - x)²

Where x is his distance from the center of the Earth

Now, G and m_a will cancel out from both sides and we plug on other values to get;

(5.98 × 10^(24))/x² ≤ (7.36 × 10^(22))/(3.84 × 10^(8) - x)²

Taking square root of both sides gives;

2445403852127.4966/x ≤ 271293199325.0107/(3.84 × 10^(8) - x)

Rearranging gives;

2445403852127.4966(3.84 × 10^(8) - x) ≤ 271293199325.0107x

Simplifying this gives;

9.0139(3.84 × 10^(8) - x) ≤ x

(34.613 × 10^(8)) - 9.0139x ≤ x

(34.613 × 10^(8)) ≤ x + 9.0139x

(34.613 × 10^(8)) ≤ 10.0139x

x ≥ (34.613 × 10^(8))/10.0139

x ≥ 3.456 × 10^(8)

By dividing the number of turns on the primary (Np) by the number of turns on the secondary (Ns), one can determine a transformer's turns ratio (Np/Ns) (Ns). As a result, Np/Ns = 8.66 is roughly the turns ratio.

Using the turns ratio method is a simpler method. By dividing the higher number of turns by the smaller number of turns, you can find a ratio. For instance: A transformer with a turns ratio of 2:1 will have 100 primary turns and 50 secondary turns.

We can instead apply the following formula:

Vs/Vp = Ns/Np Plugging in the values given:

Vs = 24 V

Vp = 208 V

Vs/Vp = Ns/Np

24/208 = Ns/Np

Simplifying:

0.1154 = Ns/Np

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Answer:

In 1957 the Soviet union launched Sputnik , the first satellite in space...

Answer:

Unequal Wavelengths

Explanation:

Got it right on the exam

Unequal wavelengths limit interference between waves because the waves will have different frequencies and will not be able to form a stable interference pattern. When waves of different wavelengths interact, they will interfere constructively and destructively at different points, creating an unpredictable pattern.

Answer:

Unequal wavelengths

Explanation:

Got it correct on the quiz.

The Magnus effect can not be observed in skiing.

Magnus' effect: When there is relative motion between the spinning body and the fluid, a sideways force is generated on a rotating cylindrical or spherical solid immersed in the fluid (liquid or gas). The effect, bears the name H.G. Magnus Phenomenon, after the German scientist and chemist who first experimentally explored the effect in 1853.

The ball is pushed higher into the air by the Magnus Effect, which has an equal-and-opposite effect to the friction between the air and the ball.

A deflection in the direction perpendicular to the spinning axis and the velocity vector results from the spinning. Tennis players frequently use top or backspin when striking the ball.

When a fastball has a backspin, the upward Magnus Effect works against gravity to keep the ball in the air longer. When a curveball has topspin, however, the downward Magnus Effect works in favor of gravity to shorten the baseball's flight.

In skiing, there is no Magnus effect

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In which of these sports can one not observe the Magnus effect?

a) Baseball

b) Tennis

c) Basketball

d) Skiing

Answer:

Explanation:

Assume that a single baby cries at X db

4 babies crying would be X + 10log₁₀(4) = X + 6 db

Although the semi truck certainly has a larger mass, it is not in motion and therefore does not have any momentum. The bicycle however has both mass and velocity and therefore has the larger momentum of the pair.

Answer:

a) 0 metres

b) From time 0 s to 10 s , the car was accelerated. Its velocity accelerated from 0m/s to 20 m/s

c) 20 m/s

Explanation:

a) Formula of displacement= velocity x time

time=40 s

velocity =0 m/s

∴ displacement= 0 x 40 = 0 m

Magnitude of displacement is 0 m

b) The increase in velocity shows that there has been acceleration.

c) The average velocity of the car is =\(\frac{0+40}{2\\}\)   {initial velocity + final velocity}

                                                            =\(\frac{40}{2}\)

                                                             =20

Therefore, the magnitude of the average velocity  of the car is 20 m/s