You hear the engine roaring on a race car at the starting line.Predict the changes in sound as the race starts and approaches the camera

A.the sound of the engine will get louder and pitch lower
B.the sound of the engine will get louder and pitch higher
C.the sound is determined by the car and it will not change in anyway
D.the sound of an engine will get louder but the pitch will not change

Answer: positive velocity, zero acceleration

Explanation: took that on the test

Potassium is in the most reactive group of elements, the alkali metals, but it's not the most reactive metal within the group. The alkali metals, Group 1A, are the most reactive metals because they have one valence or outer electron. They lose this electron very easily, forming ions with a charge of +1.

Potassium is known as a highly reactive alkali metal due to its small ionization energy that facilitates the loss of its valence electron to form K+ ions. Its extreme reactivity is also demonstrated when it reacts with oxygen, water, and halogens, often requiring it to be stored under oil to prevent accidental reactions with air or moisture.

We know that potassium is a highly reactive alkali metal due to several characteristics. One of the key reasons for its reactivity is its small ionization energy, which makes it easier for potassium to lose its single outer-shell electron and form [tex]K^+[/tex] ions. This low ionization energy is common among alkali metals, and it allows them to form monocations easily.

Potassium's reactivity is also evident as it must be stored under oil to prevent it from reacting with air. When potassium does react with air, especially oxygen, it can cause a combination reaction that is highly exothermic. A balanced chemical equation representing this reaction with oxygen is [tex]4K + O_2 \rightarrow 2K_2O[/tex].

Furthermore, the reactivity of potassium can be seen when it is placed in water. The reaction is intense enough to produce hydrogen gas and heat, with heavier alkali metals reacting even more violently. The typical reaction with water is shown by the equation [tex]2K + 2H_2O \rightarrow 2KOH + H_2[/tex]. Finally, potassium's reactivity is demonstrated in its reactions with halogens, which are typically very exothermic and even violent.

Work done is defined as product of force and displacement of point of application of force.

So here we will have

[tex]W = F.d[/tex]

now since here after applying the force the car is not displaced from its position

So here we have

d = 0

so work done is given as

[tex]W = 900 \times 0 = 0[/tex]

so there is no work done in this case

Answer:

412.1 N

Explanation:

First of all let's calculate the total speed of the ball as it is released, which is equal to the speed of the ball + the speed of the bowler:

[tex]v=80.8 mph +10.0 mph=90.8 mph[/tex]

Now let's convert it into m/s. We know that

[tex]1 mph = 0.447 m/s[/tex]

So

[tex]1 mph:0.447 m/s = 90.8 mph:v\\v=\frac{(0.447 m/s)(90.8 mph)}{1 mph}=40.6 m/s[/tex]

And now we can calculate the centripetal force, which is given by:

[tex]F=m\frac{v^2}{r}[/tex]

where

m = 0.16 kg is the mass of the ball

v = 40.6 m/s is the speed of the ball

r = 0.64 m is the radius of the circular path (equal to the length of the bowler's arm)

Substituting:

[tex]F=(0.16 kg)\frac{(40.6 m/s)^2}{0.64 m}=412.1 N[/tex]

Answer:

The mass of the object on the Moon (and anywhere else) is about 30.61kg. Please see more detail below.

Explanation:

Weight is the gravitational force exerted on the object and is a function of mass and gravitational acceleration:

(weight) = (mass) x (gravitational acceleration)

We are to find the mass, knowing the weight on Earth to be 300N:

(mass) = (weight on Earth) / (gravitational acceleration on Earth) = 300N / 9.8 m/s^2 = 30.61 kg

The mass of the object is 30.61kg.

The mass of the object is independent of gravity. Therefore the answer to the question "What is its mass on the Moon" is 30.61kg.

If the question were what is its weight on the Moon, the answer would be

(weight on Moon) = (mass) x (grav.accel. on Moon) = 30.61kg x 1.62 m/s^2 = 49.59N

which is about 1/6 of the object's weight on the Earth.

Given Data:

Displacement of objects (s) = 4.5m,

Force applied (F) = 12 N,

Work done (W)=?

Work is defined as an effort done in order to achieve the result. In this case an effort done to move the object to certain distance.

Mathematically,  From Joules law, W =  Force  × displacement

                                                         W = 12×4.5

                                                             = 54 J

I believe the answer is transmission

When light passes straight through an object, it's called transmission. This occurs within the field of geometric optics, where light paths are modeled as straight lines or rays. These rays can change direction, or refract, when they interact with different materials.

When light passes straight through an object, it is called transmission. This is a part of the field known as geometric optics, which describes the path of light using geometry and simple trigonometry. In this field, light is modelled as straight lines, also known as rays, which may change direction when they interact with objects or transition between different media, a phenomenon known as refraction.

The laws that govern these changes in direction are the law of reflection, where light bounces off an object, and the law of refraction, where light passes through an object.

Transmission, the process in which light travels without being absorbed or reflected, is fundamental in optics. You might visualize the path of light as observable in laser beams, which is especially clear in a straight, unobstructed path.

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A scientist wants to publish a report on a general feeding habits of a moose in Canada. He should observe as many moose as he can in as many locations as possible.

In science, observation is vital. Scientists gather and record data through observation, which allows them to create and subsequently test ideas and hypotheses. Scientists can observe in many different ways, including using their own senses or instruments like telescopes, thermometers, satellites, or stethoscopes.

These instruments enable more accurate and precise observations. Tools can also be used to collect data about subjects we can't directly experience, like deep space.

To  publish a report on a general feeding habits of a moose in Canada, the scientist  should observe as many moose as he can in as many locations as possible.

Learn more about observation here:

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The work done on the brick during its fall is exactly the work that was done on it to lift it up to the height of 10m in the first place, AND it's the gravitational potential energy it has while it's up there.

Gravitational Potential Energy = (mass) x (gravity) x (height)

GPE of the brick = (1 kg) x (9.8 m/s²) x (10 m)

GPE = (1 x 9.8 x 10) (kg-m² /s²)

GPE = 98 Joules

From the time it drops off the 10m shelf until it hits the ground, 98 Joules of work is done on it.

What does the work ?  Where does that energy come from ?

GRAVITY does the work on the brick !

Work can be defined as the transformation of energy released during the movement of an object when an external force is applied to the object.  

The work done by the brick is 98 Joules.

Given that the mass m of the brick is 1 kg and it dropped from a height h of 10 m. In this case, gravitational acceleration will be 9.8 m/s. Now to calculate the work done by the brick, we apply the work-energy theorem.  

The work-energy theorem states that the work done by all the forces on the object is equivalent to the total change in the kinetic energy during the movement.

Work done by the brick = Work done by gravity + Work done by air resistance

Apply that the air resistance is negligible then,

Work done by the brick = Work done by the gravity

Work Done = [tex]mgh[/tex]

Work = [tex]1\times 9.8\times 10[/tex]

Work = [tex]98 \;\rm J[/tex].

Hence we can conclude that the work done by the brick during the movement is 98 Joules.

To know more about the work, follow the link given below.

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== The volume of water in the tank is (1.5 m²) x (7 m) = 10.5 m³ .

== The density of water is 1000 kg / m³ .

== The mass of water in the tank is (10.5 m³) x (1000 kg/m³) = 10,500 kg.

== The force of gravity is (mass?) x (gravity)

force = (10,500 kg) x (9.8 m/s²)

force =  102,900 Newtons

Answer: 102,900 N

I remember this question from one of my, test. Really hope this helps..

Answer: This is wrong The correct answer is 42.4 N

Explanation: I took the USA TESTPREP

OPTION D. The weight of the frame is determined by the upward force the two cables exert to keep it in equilibrium. Each cable exerts a vertical force of 21.2 N, totaling to 42.4 N. Thereby, the weight of the frame is 42.4 N.

This problem can be solved using the principle of forces in equilibrium. If the frame is at rest and not falling, the resultant force is zero, meaning the upward forces equal the downward forces. The tension force in the cable has components parallel and perpendicular to the direction of gravity. We only need to consider the vertical component as that is the direction of the weight of the frame.

The vertical component of the tension in one cable is given by Tsinθ = 30N * sin(45°) = 21.2 N. Since there are two cables, the total upward force is 2 * 21.2 N = 42.4 N. This equals the downward force, i.e. the weight of the frame, which is therefore 42.4 N. So, the correct answer is D).

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The K.E. of car will be "784000 J".

Given values are:

Mass,

Velocity,

→ The Kinetic energy will be:

= [tex]\frac{1}{2} mv^2[/tex]

By putting the values, we get

= [tex]\frac{1}{2}\times 2000\times (28)^2[/tex]

= [tex]\frac{1}{2}\times 2000\times 784[/tex]

= [tex]2000\times 392[/tex]

= [tex]784000 \ J[/tex]

Thus the above answer is correct.

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The car's kinetic energy is calculated using the formula KE = (1/2)mv², yielding a result of 784,000 joules (J), with a mass of 2,000 kg and velocity of 28 m/s.

To calculate the kinetic energy of a car, we can use the formula for kinetic energy (KE), which is KE = (1/2)mv², where m is mass and v is velocity. In this case, the mass (m) is 2,000 kg and the velocity (v) is 28 meters per second.

Now, let's plug in the values:

KE = (1/2) × 2000 kg × (28 m/s)²
KE = (1/2) × 2000 kg × 784 m²/s²
KE = 1000 kg × 784 m²/s²
KE = 784,000 kg·m²/s² = 784,000 J

Therefore, the car's kinetic energy is 784,000 joules (J).

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Answer: 1687.5 N

Explanation:

From the second law of motion given by Newton, Force is the rate change of momentum.

[tex]F = \frac{dp}{dt}=\frac {m dv}{dt} = \frac{m (v_f-v_i)}{dt}[/tex]

Mass of the baseball, m = 0.15 kg

Initial velocity, [tex]v_i=-40 m/s[/tex] (negative because direction of initial velocity is opposite to the final velocity)

Final velocity, [tex]v_f=50 m/s[/tex]

The duration of collision, [tex]dt= 8.0 \times 10^{-3} s[/tex]

Force, [tex] F = \frac{0.15 kg (50-(-40) m/s)}{8.0 \times 10^{-3} s}=1687.5 N[/tex]

Hence, the value of force is 1687.5 N.

Answer:

Not sure but dont choose C .

1.3×10^3 Newtons

Explanation:

I cant find the answer anywhere but its not C so at least that gets rid of one of the options <3 (its probably not A either bc i feel like thats the closest to the other guys answer and it was rated poorly but choose at ur own risk)

Answer: Option (a) is the correct answer.

Explanation:

When we perform in a laboratory then it is necessary to follow the instructions  of the teacher and safety measures thoroughly so that any accident will not lead to any type of serious injury.

But if sometimes the teacher in not around you while performing the experiment then the basic safety measure to be followed is to wear gloves, goggles, and protective clothing.

Therefore, we can conclude that the most important safety rule to remember during lab activities is wear gloves, goggles, and protective clothing.

False.

This is the principle of Archimedes: A body introduced into a liquid is pushed from the bottom up with a force equal to the weight of the liquid displaced by the body.

the correct answer is false

Answer:

When the engine is running, the alternator keeps the battery charged and electrical system going. If the electrical system performs erratically battery will discharge.

Generally the metal of container is made up of such material that it will absorb heat and distribute it on the surface so that the temperature can rise and it will help to cook the food

But the handle of the container is used to hold it and we need not its temperature to be vary high so the handle must be made up of different material which will not absorb too much heat and its temperature will not rise to high value so that we can hold it easily

so here most appropriate option is given as

D) The metal in the handle can absorb more energy without changing temperature as easily as the metal in the pot.

Answer:

D) The metal in the handle can absorb more energy without changing temperature as easily as the metal in the pot.

A concave mirror is used in the design of solar furnaces because they converge the parallel sunrays at a point. This helps to increase the temperature of the furnace.

Answer:

Because "a concave mirror converge the parallel sun rays at a point, so high temperature is achieved"

Example:

           It is used in the design of solar furnaces, because they converge the parallel sun rays at a point. This helps to increase the temperature of the furnace.

After reading through all of the above, I don't find a question that needs to be answered.  

But I just want to say:

Yep.  Uh huh.  Fer sher.  You are true.  Words of higher veracity are unlikely to be found. Every word of that scenario and its description is accurate, and cannot be debated or disputed in any wise.  

What's more, I agree, and I thank you for the points.

according to newton's second law , the net force on an object is the product of mass and the acceleration of the object. The formula is given as

[tex]F_{net}[/tex] = m a

where m = mass of the object  and a = acceleration of the object.

when an unbalanced force acts on an object , there is a net force acting on the object and hence the object accelerate as a result.

hence the object accelerate in the direction of net force.

Answer:

 Time taken to travel remaining 228 miles = 2.4 hours.

Explanation:

Total distance = 876 miles.

Distance traveled after speed reduction = 228 miles

So, distance traveled before = 876 - 228 =648 miles.

Time taken for this = 6 hours.

Speed before speed reduction = 648/6 = 108 mph.

Speed after speed reduction = 108 - 13 = 95 mph

Time taken to travel remaining 228 miles = 228/95 = 2.4 hours.

Answer:

2.4

Explanation:

I just had this question

Answer: option B. a car driving on a straight freeway at 60 miles.

Explanation:

A balance forces are said to act on an object when net force on an object is zero and the object is either at rest or moves with constant speed without changing direction.

In option A, C, and D the objects are changing direction during their motion. In option B, a car moves on a straight freeway in a single direction at constant speed of 60 miles per hour. Hence, the correct demonstration of balanced forces is by option B.

the answer is the car on the highway of your doing study island

Answer:

Pluto was not considered a planet because of how small it was, therefore Pluto was removed from the solar system.

I mean i guess its the metric system?

The metric system (International System of Units, SI) is the standard of measurement used by most countries and the scientific community because it simplifies calculations, ensures accurate data comparison, and supports global collaboration in science.

The standard of measurement most countries and the scientific community use is the metric system, also known as the International System of Units (SI system). Unlike the United States, which uses the Imperial system, the metric system is universally accepted in scientific reports and research due to its simplicity and global standardization. This system is especially crucial in sciences, as it provides a 'standard language of measurement' that ensures scientists worldwide are on the same page when it comes to analyzing data and conducting experiments.

In contexts ranging from gas pumps to scientific labs, standardized measurement ensures consistency, reliability, and global understanding. Changes in the definitions of standard units of measurement reflect the dynamic nature of science and the evolving technological landscape, necessitating periodic updates to maintain accuracy and relevance in scientific discoveries.

The widespread adoption of the metric system enhances global communication in science, thus accelerating technological advancements and scientific progress. This unified approach to measurement not only facilitates international trade and commerce but also supports educational and research endeavors by providing a consistent framework for learning and discovery.

Can you provide the answers please :)

Answer:

[tex]\frac{kg}{s^2}[/tex] or [tex]\frac{N}{m}[/tex]

Explanation:

The force in a spring is described as (F) = (k) x (d) with (d) being the displacement, measured in meters. (F) is to come out in Newtons. So (k) is assigned the appropriate unit for that to happen. The two possibilities listed above achieve that.

Answer:

The units for the spring constant k is [tex]\frac{kg}{s^2}\ \text{or}\ \frac{N}{m}[/tex].

Explanation:

According to hooks law:

[tex]F=-kx[/tex]

Where F is a force, k is spring constant and x is distance.

Here, the negative sign of the force of the spring, which implies the force of the spring, is opposed to the displacement of the spring.

Now in order to find the units for spring constant k, ignore the negative sign as we are looking only at the magnitude.

[tex]F=kx[/tex]

[tex]\frac{F}{x}=k[/tex]

Therefore,

[tex]\frac{kg}{s^2}\ \text{or}\ \frac{N}{m}[/tex]

Hence, the units for the spring constant k is [tex]\frac{kg}{s^2}\ \text{or}\ \frac{N}{m}[/tex].

the answer is a unbalanced force is acting on the brick

Answer:

B). An unbalanced force is acting on the brick.

Explanation:

Here as we can see the given figure there are two forces acting on the block

1. [tex]F_1 = 7,205 N[/tex] Upwards

2. [tex]F_2 = 7,210 N[/tex] Downwards

so here as we can see that force downwards is more in magnitude while upward force is less.

So here since downward force is more so the box will accelerate downwards and net force is given as

[tex]F_{net} = F_2 - F_1[/tex]

[tex]F_{net} = 7210 - 7205 = 5 N[/tex]

so here net force on this box is 5 N downwards and since there is unbalanced force on the box so box can not remains at rest.