If a television requires 150 kJ/h to run, how many hours can the television run on the energy provided by 1.0 gal of gasoline

Answer:

  f = 409.6 Hz,  the woman hears a higher frequency sound

Explanation:

This is a Doppler effect problem, which is described by the equation for the case of a fixed observer

          f = fo \(\frac{v}{v \pm v_s}\)

where the negative sign is for the source approaching the observer

in this case the car is the one that emits the sound and moves away from the intersection

let's calculate

          f = 400  \(\frac{343}{343-8}\)

          f = 409.6 Hz

therefore the woman hears a higher frequency sound

The height of the building is 42.4 meters.

Let's call the height of the building "h". We can use the following kinematic equations to solve for "h":

For the stone that is dropped from the top of the building:

h = (1/2)gt² (Equation 1)

For the stone that is thrown upwards from the ground:

y = vt - (1/2)gt² (Equation 2)

where;

We know that the two stones meet at exactly 5s after their release. This means that the distance travelled by the stone thrown upwards from the ground is equal to the height of the building, i.e.,

y = h

We can substitute this equation into Equation 2 and rearrange it to solve for "t":

h = vt - (1/2)gt²

h = 20t - (1/2)gt²

t = (2h/g - 20)/(-1) (Equation 3)

Now we can substitute Equation 3 into Equation 1 and solve for "h":

h = (1/2)g((2h/g - 20)/(-1))²

h = (1/2)g(2h/g - 20)²

h = (1/2)g(4h²/g² - 80h/g + 400)

Simplifying this equation by multiplying everything by 2g and moving all the terms to one side, we get:

4h² - 160h - 400 = 0

Solving this quadratic equation using the quadratic formula, we get:

h = (160 ± sqrt(160² + 4(4)(400))) / (2(4))

h = (160 ± sqrt(32,000)) / 8

We can ignore the negative solution, so:

h = (160 + 178.88) / 8

h = 42.4 meters

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The H-R diagram, also known as the Hertzsprung-Russell diagram is a graph that demonstrates the relationship between luminosity, temperature, classification, and spectral types of stars. This diagram shows the life cycle of stars. The life cycle of stars begins with their formation, followed by a sequence of changes leading to the death of a star. The location of a star on an H-R diagram enables us to determine the mass, temperature, and luminosity of the star.

The following can be determined from the location of a main-sequence star on the H-R diagram- The position of a star on the H-R diagram is determined by the star's mass. More massive stars are placed to the left of the diagram, while less massive stars are placed on the right. Temperature can be calculated by looking at where the star falls on the horizontal axis of the H-R diagram. The temperature ranges from cool to hot, left to right. By studying the location of the star on the vertical axis, we can determine its luminosity. The luminosity ranges from dim to bright, from bottom to top.

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Answer:

Explanation:

ave speed is always (frequency) x (wavelength)

Speed  =  (450 /sec) x (0.52 m)

=      234 m/sec .

Answer:

Secrets? Cuz if I share you the secrets then the secrets will no longer will be secrets.

Answer:

48 seconds

Explanation:

Since S=d/t, plug in the known values and solve

0.25m/s=12m/t

0.25m/s*t=12m

t=12m/0.25m/s

t=48 seconds

Car acceleration is 7.794 m/s2 and the average force F is 638.32 N.

Because the passenger is in the car, the passenger experiences the same velocity and acceleration as the car.

Linear impulse equals mass times a change in speed (Vf - Vi)

Initial velocity is Vi, whereas ultimate velocity is Vf.

When the passenger's mass,

m(mass), is 81.9 kg,

the linear impulse is 81.9 kg ×(4.1 - 0)

= 335 kgm/s.

F(average) = m × acceleration

Acceleration = Vf - Vi/ t

Acceleration= 4.1 - 0 ÷0.526

Acceleration= 7.794 m/s²

F(average) = 81.9 kg × 7.794 m/s²

F = 638.32 N

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The term that best describes the landform "dip in a mountain range" is C. Syncline.

Syncline is a term to refer to a fold of the Earth's crust caused by the tectonic effects of the earth's dynamics. A synclinal fold is characterized by being a concave fold, that is, in the shape of a U.

According to the above, answers A, B and D are not correct options because they refer to different shapes of the Earth. Therefore, the landform shown is syncline.

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Answer: C

Explanation: E2022

Answer:

Gravity - is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another.

Strong Interaction - is the mechanism responsible for the strong nuclear force

Weak Interaction - is the mechanism of interaction between subatomic particles that is responsible for the radioactive decay of atoms

Electromagnetism - is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles.

Hope this helps!

Answer:

No, it is not necessary for them to have same mass.

Explanation:

Let both bodies have a density d1 and d2 respectively.

Since their volumes are equal V1 = V2

we know that, https://tex.z-dn.net/?f=%5Cfrac%7Bmass%7D%7Bvolume%7D

Hence, d1 =  and d2 =    

Taking the ratio of densities,we get

This implies that unless the bodies have same densities, the mass of the two bodies will not be same.

Answer:

Explanation:

No, not any of these substance will float in Methanol , simply because Methanol has a density of 0.79 g, if you put any substance that weighs more than 0.79 g, it will sink, it all depends on the weight if it is more or less than methanol  

2: D=m/v

D=135/50 = 2.7 g/cm³ ( Aluminum)

D=M/V

if two objects has the same mass but one has larger volume, then te one with larger volume has less density

example : 2 objects

mass of both=350

volume of the first one=500 and  the other 750

D1=M1/V1 = 350/500 =0.7

D2 = M2/V2 = 350/750 = 0.4666

D1 is larger than D2( with larger volume )

Let's call the length of the race track as "x".

To solve for "x", we can use the formula:

\(\implies\text{ Time} = \dfrac{\text{ Distance}}{\text{ Speed}}\)

Since the race ends in a tie, we know that Jan and Mary both took the same amount of time to run the race. Let's call this time "t".

\(\implies \text{ Time} = \dfrac{\text{ Distance}}{\text{ Speed}}\)

\(\implies t = \dfrac{x - 25}{7.5}\)

\(\implies\text{ Time} = \dfrac{\text{ Distance}}{\text{ Speed}}\)

\(\implies t = \dfrac{x}{8.0}\)

Since both expressions represent the same time, we can set them equal to each other and solve for "x":

\(\implies \dfrac{x - 25}{7.5} = \dfrac{x}{8.0}\)

Multiplying both sides by 60 (the least common multiple of 7.5 and 8.0) to get rid of the decimals:

\(\implies 8(x - 25) = 7.5x\)

\(\implies 8x - 200 = 7.5x\)

\(\implies 0.5x = 200\)

\(\implies x = 400\)

\(\therefore\) The length of the race track is 400 meters.

\(\blue{\overline{\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad}}\)

Answer:

a) the building of irrigation systems

Explanation:

Although b and c would also allow for farmers to grow more crops, I believe that the building of irrigation systems had the most impact. Irrigation systems allowed for farmers to have larger fields without having to spend a large amount of time watering the entire field.

Answer: I think it is a

Explanation:

Answer:

90 mAmps

Explanation:

V=IR

V/R = I

9 v / 100 ohm = .09 amps = 90 mAmps

A 1500-kg car moving around 25 m/s collides with a horizontal spring that is initially uncompressed but has a spring stiffness of 2.0?106 n/m as well as a max compress of x = 0.68 meters.

Compress, constrict, contract, inflate, and shrink are a few words that frequently replace the word compress. While all of these phrases refer to "decreasing in bulk or area," compress indicates squeezing over resistance into a constricted area with a certain shape.

Considering that,

The automobile weighs 1500 kg.

Vehicle speed, v = 25 m/s

spring's spring constant, k=2×10⁶ N/m

Let x be the greatest distance the spring may compress before breaking,

1/2mv²=1/2kx²

1/2mv²=1/2kx²

x=\(\sqrt{mv^{2} /k}\)

x=\(\sqrt{1500*25x^{2} /2*10^{6} }\)

x = 0.68 meters

The spring is thereby compressed by 0.68 meters.

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Starting conditions in a protogalactic cloud can lead to the formation of an elliptical galaxy if the cloud begins with a high angular momentum or a lack of cold gas.

High angular momentum: If the protogalactic cloud has a high angular momentum, it will lead to the formation of a rapidly rotating disk. However, if there are significant mergers or interactions with other galaxies, the angular momentum can be transferred to the surrounding environment, causing the disk to lose its rotational motion and become more spheroidal or elliptical in shape. This process is known as angular momentum redistribution. Lack of cold gas: Elliptical galaxies are generally devoid of active star formation and have a lower abundance of cold gas compared to spiral galaxies. If the protogalactic cloud lacks a sufficient amount of cold gas, it will hinder the formation of new stars and result in an elliptical galaxy. This could be due to various factors such as a low initial gas content, strong galactic winds, or intense feedback from massive stars, which expel gas from the system. These two scenarios highlight how the initial conditions of a protogalactic cloud, specifically the angular momentum and the presence of cold gas, play crucial roles in determining whether it will evolve into an elliptical or a spiral galaxy.

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If F = 37 N, the static frictional force between the block and the table and the minimum force required to move it must be equal.

It is the force that regulates itself. The value of static friction varies from zero to the smallest force required to initiate motion. The formula for determining static friction is as follows: Normal Force divided by the static friction coefficient is static friction.

Although the maximum static friction will rise, the frictional force will always be the same as the weight in mg because friction cannot accelerate an object. Because FrN can take any value less than N to balance the weight, this is the case.

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Answer:

kinematic eq.  d = Vi*t + 1/2a*\(t^{2}\)

Explanation:

Vi=0

d=1/2 a*\(t^{2}\)

d= 1/2(9.8)\(0.9^{2}\)

d=3.969 m

The distance from which the object falls is 393.9 meters.

Given that, an object falls from a high building and hits the ground in 9.0 seconds and air resistance = 0

So the distance can be calculated by the formula given below.

\(s = vt + \dfrac{1}{2} at^2\)

Where, \(s\) is the distance in meters, \(t\) is time (in seconds) taken by the object in motion, \(a\) is the acceleration of the object in meter per second square and \(v\) is  the final velocity in meter per second.

In this case, object falls from high building to the ground so the final velocity would be zero. Gravitational acceleration is -9.8 meter per second square.

Substituting the values in the above formula,

\(s = (9.0\times0) + \dfrac{1}{2}(-9.8\times(9.0)^2)\\s = 0 + (-9.8\times81\times0.5)\\s = 396.9 \;\rm m\)

The distance from which the object falls is 393.9 meters.

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You reach a conclusion regarding your hypothesis after collecting and analyzing data. A conclusion summarizes what you learnt from an experiment. While forming your conclusion, consider if the data supports your theory.

Each step of the scientific method with its description.

1- C ( this is an assumption; a hypothesis is always based on an assumption. After the introductory analysis is complete, construct a hypothesis, or an instructed opinion, on the result of the experiment.

2- F ( this states to share the results with other classmates).It is important to share what you have learned with others. Scientists often find solutions to problems by knowing the results of other scientists' experiments.

3- D (this is a description of an experiment you could conduct; you test a hypothesis (usually) by conducting an experiment. A statistical hypothesis, seldom called affirmative data summary, is a hypothesis that is testable on the foundation of perceiving a method that is formed via a set of arbitrary variables.

4- A (this is something you could observe during the experiment, therefore it is an observation).Scientists use observation to gather and record data, which allows them to assemble and then test hypotheses and assumptions.

5- E (this sentence is a conclusion).After all the data is assembled in a form that associates it to your hypothesis, you can understand it and reach a judgment about the experiment.

6- B (This is an actual question) A question is what someone asks, normally when there is something that he or she does not know. In the article, a question mark comes at the end of a question.

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Full Question ;

Match each step of the scientific method with its description.

Tiles

1. construct a hypothesis

2. communicate the results

3. test the hypothesis

4. make observations

5. analyze the results and

make a conclusion

6. ask questions

Pairs

A. Bread, when kept in the open for a

long time, shows the presence of mold.

B. What causes mold growth on bread?

C. Changes in temperature may affect

the growth of mold on bread.

D. Keep the bread in different locations,

changing the temperature at each location.

E. Increased temperature leads to the

growth of mold.

F. Make a presentation of the data, and

Answer:

B. 40 m/s

Explanation:

v=vo+at

a= 10m/s squared

t=4s

vo=0

v=?

v=4(10)

v=40m/s

-Have a great day!

The velocity of the object just before it hits the ground is 40 m/s

The given parameters;

time of the pebble, t = 4 s

To find;

The following kinematic equation will be used;

\(v = v_0 + gt\)

where;

g is the acceleration due to gravity = 10 m/s²;

\(v = 0 + 10 \times 4\\\\v= 40 \ m/s\)

Thus, the velocity of the object just before it hits the ground is 40 m/s

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Answer:

The source of Jupiter's intense magnetic field is believed to be a dynamo effect generated by the motion of electrically conducting materials within its deep interior.

Electrical currents in the planet's outer core, which is made of liquid metallic hydrogen, are what create Jupiter's internal magnetic field.

Jupiter has the strongest magnetic field of any planet in the solar system, with a magnetic field strength of approximately 4.3 gauss (430 µT) at the equator. It is caused by Jupiter's liquid metallic hydrogen core, which rotates at a different rate from the planet's outer envelope.

This generates electric currents in the region where the metallic hydrogen layer meets the atmosphere, resulting in a powerful magnetic field that extends far into space.

Jupiter is the largest planet in the Solar System and the fifth from the Sun. It is a gas giant with a mass that is slightly less than one one-thousandth the Sun's and more than twice as much as all the other planets in the Solar System put together.

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Explanation: As the angle is increased the acceleration of the object is increased as the angle increases the component of the force parallel to the incline increases and the component of forced perpendicular to the inclined decreases it is the parallel component of the weight vector that causes the acceleration.

Answer:

In order for sugar to dissolve, there must be an attraction between the two substances.

Explanation:

Water and sugar are both attracted to each other, which is why sugar is able to dissolve in water.

Hope this helps! :)

Answer:

the water was stirred

Explanation:

it’s need as a type of attraction

if you increase the pressure on a sprinkler nozzle from 46 psi to 66 psi, the new flow rate will be approximately 32.496 gallons per minute, assuming a flow rate coefficient (K) of 4.0.

Q = K * √(P)

where sqrt(P) is the square root of the pressure in psi.

Using this formula, we can calculate the new flow rate as follows:

New flow rate = 4.0 * √(66) = 4.0 * 8.124 = 32.496 gallons per minute (approx.)

Pressure is a physical quantity that describes the force exerted per unit area. It can be defined as the amount of force applied to a given area or surface. Pressure is typically measured in units of Pascals (Pa), which is equivalent to one Newton per square meter (N/m²).

Pressure can be exerted by any type of matter, including gases, liquids, and solids. For example, the pressure of the air around us is the result of the weight of the atmosphere pushing down on the surface of the Earth. In general, pressure increases with increasing depth in a fluid or with increasing force applied to a surface. It also varies with temperature and can be affected by the properties of the material being measured.

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Answer:

q+13

Explanation:

The formula for the P-series is:

P-series = 1 + \(\frac{1}{2}\) + \(\frac{1}{3}\) + \(\frac{1}{5}\) + \(\frac{1}{7}\) + \(\frac{1}{11}\) + ...

The P-series is a mathematical formula that describes the distribution of prime numbers. In particular, the P-series formula states that the sum of the reciprocals of the prime numbers converges to a value called the P-series constant.

The series starts with the reciprocal of the first prime number, 2, and continues on to infinity. The P-series formula is closely related to the Riemann zeta function, which is a more general formula that describes the distribution of prime numbers and other types of numbers.

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Hello,

Assuming that the initial velocity of the jumper is zero, on Earth any freely falling object has an acceleration of 9.8 m/s².  

✔ We have : a = v/Δt = ⇔ Δt = v/a

If a cliff jumper leaps off the edge of a 100 m cliff , then she would have fallen 4.51 seconds before hitting the water.

There are three equations of motion given by  Newton,

v = u + at

S = ut + 1/2 × a × t²

v² - u² = 2 × a × s

As given in the problem If a cliff jumper leaps off the edge of a 100 m cliff, then we have to find out how long she falls before hitting the water.

By using the second equation of the motion,

S = ut + 1/2 × a × t²

100  = 0 + 0.5 × 9.8 × t²

t²  = 100 / 4.9

t = 4.51 seconds

Thus, If a cliff jumper leaps off the edge of a 100 m cliff, then she would have fallen 4.51 seconds before hitting the water.

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