An automobile is traveling at a constant 15 m/s, then it undergoes acceleration from that moment forward. Which statement best describes the automobile's new motion?​

Answer:

I think A

Explanation:

because I don't think a unknowned number can be a division problem

The heat released in the whole process in which a sample of water is cooled and frozen is 4.64 * 10⁸ J.

The problem is to be divided into two steps. This process releases a certain quantity of heat,

Step 1) Solidification of the water at 0°C into ice.

Q = m* Lf

where,

m is the mass of the water

Lf stands for the latent heat of ice fusion

Substituting numbers, we find

Q₁ = (1271 kg)* (334 kJ/kg) = 424514 kJ = 4.2* 10⁸ J

step 2) The water became ice, now we need to cool it down to -36°C . This process releases a certain quantity of heat, which is

Q₂ = m* Cs* ΔT

where,

m is the mass of ice

Cs is the specific heat of ice

ΔT is the variation of temperature

By placing the numbers in the formula, we have,

Q₂ = (1271 kg)* (2050 J/kg K) (-17-0) = 44294350 J = - 0.44 * 10⁸ J

The negative sign means the heat is released by the system.

Thus, the overall process produces heat that is

Q = Q₁ + Q₂ = 4.2* 10⁸ J + 0.44 * 10⁸ J = 4.64 * 10⁸ J

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1. A complete fitness and exercise program should incorporate three basic components: Endurance (Aerobic), Flexibility, and Strength. Each of these components has specific guidelines, which govern their effectiveness

Answer:

C.

Explanation:

It is C.

\(\rm CO_2\) and \(\rm H_2O\) ,are the products are formed when ethane undergoes combustion. Option C is correct.

Combustion  is an exothermic chemical process that creates oxidized, frequently gaseous compounds in a mixture known as smoke.

Ethane combustion is simply a combustion process in which ethane burns in the presence of oxygen. Both carbon dioxide and water vapor are produced in this process.

The chemical reaction for the ethane combustion is;

\(\rm 2C_2H_6 (g) + 7O_2 (g) ---- > 4CO_2 (g) + 6H_2O (g)\)

Hence, option C is correct.

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Explanation:

thermodynamics is the study of heat.

Answer The study of heat and its relationship to useful work is called thermodynamics and involves macroscopic quantities such as pressure, temperature, and volume without regard for the molecular basis of these quantitie

Explanation:

The vector described as "40 feet to the right" can also be expressed as a displacement vector. It represents the change in position of an object as it moves from one point to another.

Specifically, the vector denotes a horizontal displacement of 40 feet in the positive x-direction from the starting point.

Another way to describe the vector is to use a coordinate system. If we place the starting point at the origin (0,0) and define the x-axis to be the horizontal direction and the y-axis to be the vertical direction, then the vector can be represented as (40,0), where the first number corresponds to the x-coordinate and the second number corresponds to the y-coordinate. This notation emphasizes the fact that the vector has no vertical displacement, only a horizontal displacement of 40 feet.

Alternatively, we could describe the vector using magnitude and direction. The magnitude of the vector is simply its length, which in this case is 40 feet. The direction of the vector can be described as "to the right" or "in the positive x-direction." This notation is useful when comparing vectors with different magnitudes but the same direction or vice versa.

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Answer:

the lowest point, where the amount of energy is the greatest

Explanation:

The correct answer is "The roller coaster cars determine the amount of kinetic energy in the system. It’s the only part of the system that moves. Kinetic energy depends on the velocity and mass of a moving object."

Answer:

The mass of the cars and people and the height of the track where the cars are located determine the potential energy in the system. Potential energy depends on an object’s mass and height and the gravitational pull on the object. A change in gravity would result in a change in potential energy. For example, if the track were located on the Moon instead of Earth, the potential energy would be different.

Explanation:

Answer:

It could be a stringed instrument or an open pipe.

Explanation:

Let v be the speed of sound, y be wavelength and f be frequency.

v = yf

f= v/y; v is constant.

In a stringed instrument, the fundamental frequency note is heard when the length of the string, l = y/2; y= 2l

f′= v/2l

The second harmonic is heard when l= y

f"= v/y

...

f'''= 3v/2l

We can infer that f"= 2f'

f'''= 3f'

This is similar to the values in the question as;

523.26 =2(261.63) and so on.

Same thing happens with open pipes.

The acceleration of the block is 2.66 m/s².

To solve this problem, we need to first resolve the force acting at an angle of 30° above the horizontal into its horizontal and vertical components.

The horizontal component will be responsible for the motion of the block, while the vertical component will be balanced by the normal force acting on the block.

The horizontal component of the force is given by:

Fx = Fcos(30°)

Fx = 10Ncos(30°)

Fx  = 8.66N

The force of friction acting on the block is given by:

Ff = coefficient of sliding friction x normal force

The normal force is equal in magnitude and opposite in direction to the vertical component of the applied force:

Fn = Fsin(30°)

Fn = 10Nsin(30°)

Fn = 5N

Therefore,

Ff = 0.4 x 5N

Ff = 2N

The net force acting on the block in the horizontal direction is:

F_net = Fx - Ff

F_net = 8.66N - 2N

F_net = 6.66N

The acceleration of the block is given by:

a = F_net / m

a = 6.66 N / 2.5 kg

a = 2.66 m/s²

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The complete question is below:

a 2.5 kg block is being pulled to the right by a 10N force acting 30° above the horizontal undergoes uniform motion on a level surface. the coefficient of sliding friction between the block and the surface is 0.4 what is the acceleration of the block(g = 9.8m/s²)​

Explanation:

Here is the first one....you should try the second one...

What will most likely lead a scientist to investigate a blood-thinning agent in the saliva of vampire bats is curiosity.

Curiosity is defined as an inquisitive trait which is one of the qualities of a good scientist which drives them to discover more in their field.

For a scientist to investigate a blood-thinning agent in the saliva of vampire bats would have been driven by curiosity to do so.

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Answer:

The photon,s a type of elementary particle. It is the quantum of the electromagnetic field including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force.

Explanation:

Answer:

1920watts

Explanation:

P=IV

P = 16 x 120 = 1920 watts

The distance traveled by the elevator is 2.0136 m.

Given values: Mass, m = 602 kg. Initial velocity, u = 0 m/s. Time taken, t = 2.60 s. Final velocity, v = 1.72 m/s.(a) Find the acceleration of the elevator. The formula to calculate the acceleration is given below:

a = (v - u)/t Substitute the given values in the above equation and get the acceleration value.

a = (1.72 - 0)/2.60a = 0.6615 m/s²Therefore, the acceleration of the elevator is 0.6615 m/s².

(b) Find the distance traveled by the elevator. The formula to calculate the distance is given below:

s = ut + 1/2at²Substitute the given values in the above equation and get the distance traveled by the elevator.

s = 0(2.60) + 1/2(0.6615)(2.60)²s = 2.0136 m.

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Answer-

mk thats kool.

Answer:

Force Friction

Explanation:

Answer:

the answer to this question is the first one. i'm sorry I can not say it because it delete my answer

Explanation:

The size of the angle θ of a point object moving from point A to point B along a circular path is 2πR / L.

To understand this, consider a simple example. Suppose that a point object that moves from point A to point B along a circular path with a radius of 1 meter. The distance between points A and B is also 1 meter. Therefore, the size of the angle θ is equal to 2π × 1 / 1 = 2π radians.

In general, the size of the angle θ = ratio of the circumference of the circle to the distance between points A and B. The circumference of the circle is equal to 2πR, where R = radius of the circle. Therefore, the size of the angle θ is equal to 2πR / L.

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Complete question:

A point object moves from point A to point B along a circular path with a radius R. What is the size of the angle θ?

12. The time taken for the journey is 400 s

13. The time taken for the train is 200 s

14. The time taken is 7 h

15. The time taken for the beetle is 12 s

16. The time taken for the journey is 0.0068 h

The time taken in each case as given by the question can be obtain as follow:

12. The time taken for the journey

Time taken = Distance / Speed

Time taken = 26000 / 65

Time taken = 400 s

13. The time taken for the train

Time taken = Distance / Speed

Time taken = 3200 / 16

Time taken = 200 s

14. The time taken to travel

Time taken = Distance / Speed

Time taken = 672 / 96

Time taken = 7 h

15. The time taken for the beetle

Time taken = Distance / Speed

Time taken = 1.08 / 0.09

Time taken = 12 s

16. The time taken for the journey

Time taken = Distance / Speed

Time taken = 35 / 5147

Time taken = 0.0068 h

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Answer:

which can cause an object with mass to change its volocity

Answer:

just go to demos:) yere yerre

Answer: 3m

Explanation: If he is already 2m away from the mirror then if he walks away 1m then it would equal out to 3. You could also add 1 to 2 so you could get the same results.

The right answer is A). The wavelength of the wave likewise reduces when the frequency of the light wave falls as it moves from a rarer to a denser medium because the frequency of light waves remains constant in all media.

Light is bent as it passes through a different medium because of the speed difference. Light waves are bent at different angles because they are slowed down at varying rates.

If light is initially absorbed by electrons in a substance to elevate their energy level, this can affect the wavelength of the light.

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Answer:

706 J

Explanation:

Use the gravitational potential energu equation

Eg = mgh

and sub in the values

Eg = (4kg)(9.8)(18)

Eg = 705.6

Answer:

Improvement in observational, and exploratory technology

Rapid increase in knowledge

International collaboration

Explanation:

Our knowledge of the solar system has increased greatly in the past few years due to to some factors which are listed below.

Improvement in observational, and exploratory technology: In recent years, developments in technology has led to the invention of advanced observational instruments and probes, that are used to study the solar system. Also more exploratory units are now developed to go out into the solar system and gather useful data which is then further processed to yield more results about our solar system.

Rapid increase in knowledge: The past few years has seen an increased number of theories proposed to explain phenomena in the solar system. Some of these theories have been seen to be accurate under experimentation, leading to newer and fresher insights into our solar system. Also, new experiments and research are carried out, all these leading to an exponential growth in our knowledge of the solar system.

International Collaboration: The sharing of knowledge by scientists all over has led to a better, quick understanding of the solar system. Also, scientists from  different countries, working together on different experiment and data sharing regarding our solar system now allows our knowledge of the solar system to deepen faster.

Answer:

See below

Explanation:

rho = R A/l     R = resistance   A = cross sectional area l = length