In each of three trials of an investigation, a single force is applied to a mobile. Each time, the mobile acquires a different acceleration. The table
shows the relationship between the acceleration and the acting force.
Acceleration (m/s²)
Force (N)
1.2
0.7
1.6
4.8
2.8
6.4
Which phrase best describes a graph that would represent the relationship shown in the table? (1 point)
an upward-sloping line drawn on a graph with acceleration shown on the x-axis and force shown on the y-axis
a downward-sloping line drawn on a graph with acceleration shown on the y-axis and force shown on the x-axis
a downward-sloping line drawn on a graph with acceleration shown on the x-axis and force shown on the y-axis
an upward-sloping line drawn on a graph with acceleration shown on the y-axis and force shown on the x-axis

The average velocity of the car is 2.78 m/s.
To find the average velocity, we need to use the formula:
Average velocity = total displacement / total time

Here, the car travels 20 km in a westerly direction, which means its displacement is 20 km to the west. However, we need to convert this to meters, since the units for velocity are in m/s.

1 km = 1000 m

So, 20 km = 20,000 m

The time taken is given as 2 hours. However, we also need to convert this to seconds, since the units for velocity are in m/s.

1 hour = 3600 seconds

So, 2 hours = 2 x 3600 = 7200 seconds

Now, we can substitute the values into the formula:

Average velocity = 20,000 m / 7200 s

Average velocity = 2.78 m/s (rounded to two decimal places)

Therefore, the average velocity of the car is 2.78 m/s.

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Answer:

The star's luminosity rises above its previous level. Because it is so cool, the surface will be red, and it will be much farther away from the center than it was during the earlier stages of star evolution. Despite its lower surface temperature, the red giant has a large surface area, which makes it very luminous.

\(\huge\fbox\orange{A} \huge\fbox\red{N}\huge\fbox\blue{S}\huge\fbox\green{W}\huge\fbox\gray{E}\huge\fbox\purple{R}\)

\(\huge\underline\mathtt\colorbox{cyan}{For Positively Charged:}\)

By gaining electrons from the ground, the object will have a balance of charge and therefore be neutral. Grounding is the grounding of a positively charged object and involves the transfer of electrons from the ground into the object.

\(\huge\underline\mathtt\colorbox{red}{For Negatively Charged:}\)

If it is to have its charge removed, then it will have to lose its excess electrons. Once the excess electrons are removed from the object, there will be equal numbers of protons and electrons within the object and it will have a balance of charge.

Answer:

look down

Explanation:

a. The period of the solar system's orbit, assuming the orbit is circular, is \(2.05X10^{8} years\).

b. There have been 24.4 completed revolutions.

c. The star has a mass of \(1.87X10^{41}\) kg.

d. There are \(9.45X10^{10}\) stars in the galaxy's center.

a. Distance equals 25,000 light years.

\(3X10^{8}\)m/s equals the speed of light (c)

230 m/s is the astronomers' speed.

Using the time period formula,

\(t=\frac{d}{v}\)

\(t= \frac{2\pi r}{v}\)

r = distance

t = time, and v = speed.

Fill out the formula with the value

\(t = \frac{2\pi * 25000 * 9.46 * 10^{15} }{230 * 10^{3} }\)

\(t= 6.460*10^{15} sec\)

Number of years

\(t= \frac{6.460*10^{15} }{3.15*10^{7} } \\t= 2.05*10^{8} years\)

Consequently, the solar system's orbit lasts \(2.05*10^{8}\).

b. The solar system's average age is Tn=5 billion years, or \(5* 10^{9}\) years.

The number of completed revolutions can be computed as

\(N=\frac{T^{n} }{T} \\N= \frac{5*10^{9}years }{2.05*10^{8}years } \\N=24.4\)

24.4 revolutions have been completed.

c. The solar system's radius, r=25000 light years

velocity = 230 km/s

We can determine the big star's mass as

\(M= \frac{v^2r}{G} \\\)

By substituting values, we obtain

\(M= \frac{(230*10^{3})^2* (25000*3*10^{8}*365*24*60*60m) }{(6.67*10^{-11} N/kg^2.m^2)}\)

\(M= 1.87*10^{41} kg\)

The star has a mass of \(1.87*10^{41} kg\).

d. The sun's mass, \(M_{s}\), is \(1.99*10^{30} kg\)

The star's number can be computed using

\(N=\frac{mass of glactic center}{mass of sun} \\N= \frac{1.88*10^{41} }{1.99*10^{30} } \\N= 9.45*10^{10}\)

There are \(9.45*10^{10}\) beginnings, or around 94.5 billion, each year.

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We don't see extra dimensions because they're compactified, limiting our perception to only three observable spatial dimensions.

In certain particle physics theories, the universe has extra dimensions beyond the familiar three.

However, we only experience three spatial dimensions because the additional dimensions are "compactified" or "curled up" on a scale too small to be directly observed.

This compactification keeps the extra dimensions from having significant effects on our daily lives and the macroscopic world.

These theories suggest that only particles or forces at extremely high energy levels or minuscule scales would interact with or reveal the presence of these extra dimensions, making them challenging to detect in everyday experiences.

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Answer:

53.1 Degrees

Explanation:

Process of elimination

Answer:

(A). The force acting on the rocket is mg.

(B). The initial upward acceleration of the rocket is 6.2 m/s²

Explanation:

Given that,

Mass of rocket = 5 kg

Force = 80 N

Time = 4 sec

(A). We need to draw the figure

The force acting on the rocket at each of the intervals is shown in figure.

The force acting on the rocket is mg.

(B). We need to calculate the initial upward acceleration of the rocket

Using balance equation

\(ma=F-mg\)

\(a=\dfrac{F-mg}{m}\)

Put the value in the equation

\(a=\dfrac{80-5\times9.8}{5}\)

\(a=6.2\ m/s^2\)

Hence, (A). The force acting on the rocket is mg.

(B). The initial upward acceleration of the rocket is 6.2 m/s²

The correct order of increasing impedance is:

C. PZT, gel, skin, matching layer

Impedance is a measure of the opposition to the flow of sound waves in a medium. It depends on the density and speed of sound in the material. In the given options, the order of increasing impedance can be determined by considering the properties of the materials involved.

PZT (lead zirconate titanate) has a higher impedance than gel, skin, and the matching layer. PZT is a piezoelectric material commonly used in ultrasound transducers and has a higher density and speed of sound, leading to higher impedance.

Gel has a lower impedance compared to PZT but higher impedance than skin and the matching layer. Gel is used as a coupling medium between the transducer and the skin to enhance acoustic coupling and minimize impedance mismatch.

Skin has a lower impedance than both gel and the matching layer. It is the outermost layer and acts as an interface between the transducer and the biological tissue.

The matching layer has the lowest impedance among the given options. It is designed to match the impedance of the PZT to the impedance of the tissue being imaged, facilitating efficient sound transmission.

Therefore, the correct order is C.

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True. In order to measure the distance to an object using parallax, it must be viewed from two different locations.

Parallax is the apparent shift in the position of an object when viewed from different perspectives. By measuring the angle of this shift and knowing the baseline distance between the viewing locations, the distance to the object can be calculated using trigonometry. Therefore, two different viewpoints or locations are necessary to obtain the necessary parallax measurements for distance determination.

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Answer:

Every action has an equal and opposite reaction.

Explanation:

Answer:

An action-reaction force pair

Explanation:

Answer:

newtons third law was that every action has an equal and opposite reaction.

The magnitude of the motional emf in the rod is 0.1872 when an isolated conducting rod of length 8.00 cm is oriented parallel to the x-axis. The speed of rod in y-direction is 3.90m/s.

Given an isolated conducting rod of length (l) = 8.00 cm = 8x10-2m

it moves in the y-direction at (v) = 3.90 m/s

uniform magnetic field of magnitude (B)= 0.600T

Let the magnitude of the motional emf in the rod be E

We know that E = BxlxV

E = 0.600T x 3.90m/s x 8x10-2m = 18.72x10-2

Hence the magnitude of the motional emf in the rod is 0.1872

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With the use of K.E formula, the correct answers are:

a.) At point B, velocity = 2m/s

b.) At point C, velocity = 4m/s

C.) At point D, velocity = 3.5 m/s

POTENTION ENERGY

At maximum energy, total energy will be equal to maximum kinetic energy.

Given that a 2.5 kg mass starts from rest at point A and moves along the x-axis subject to the potential energy shown in the given figure.

Let us assume the that their maximum potential energies are given.

Total energy = maximum P.E = Maximum K.E

According to the graph, the P.E at point B,C, and D are:

Since Maximum P.E = Maximum K.E = 1/2m\(v^{2}\)

At point B

5 = 1/2 x 2.5 x \(v^{2}\)

\(v^{2}\) = 10/2.5

\(v^{2}\) = 4

v = \(\sqrt{4}\)

v = 2 m/s

At point C

20 = 1/2 x 2.5 x \(v^{2}\)

\(v^{2}\) = 40/2.5

\(v^{2}\) = 16

v = \(\sqrt{16}\)

v = 4 m/s

At point D

15 = 1/2 x 2.5 x \(v^{2}\)

\(v^{2}\) = 30/2.5

\(v^{2}\) = 12

v = \(\sqrt{12}\)

v = 3.5 m/s

b.) The turning point should be any point where velocity is negative. Since there is no point where velocity is negative, let us consider the points where potential energy is increasing.

The turning points of the mass will be at point B and D

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Kepler's laws of planetary motion are based on detailed observations made by the astronomer Tycho Brahe.

Kepler's laws of planetary motion are based on detailed observations made by the astronomer Johannes Kepler himself. Johannes Kepler was a German mathematician, astronomer, and astrologer who lived from 1571 to 1630. He made significant contributions to the field of astronomy and is best known for his three laws of planetary motion, which he derived based on meticulous observations made by his predecessor Tycho Brahe.

Kepler's laws describe the motion of planets around the Sun and revolutionized our understanding of the solar system. His observations, combined with his mathematical calculations and analysis, led to the formulation of these laws, which are fundamental principles in the field of astronomy and planetary science. Kepler's laws provide valuable insights into the nature and mechanics of planetary orbits, and they laid the foundation for later developments in celestial mechanics and the study of gravitational forces.

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Answer:

Explanation:

a = 4m/s

b = 7m/s

R = ?

R = sq. 4*2 + 7*2 + 2 x 4 x 7 x cos60

R = sq 93

direction is the angle which is already given in question.

potential at point A( -776 V)

the potential at point B;( -855 V)

the work done by the electric field on the charge is 198 nJ.

first, we can use Coulomb's law to find the electric field at points A and B due to the two charges:

Electric field at A:

\(E1 = kq1/r1^2\), where k is Coulomb's constant \((9*10^9 Nm^2/C^2),\) q1 is the charge of q1 (+2.4 nC), and r1 is the distance from q1 to A (0.050 m)

\(E2 = k*q2/r2^2\), where q2 is the charge of q2 (-6.5 nC), and r2 is the distance from q2 to A (0.050 m)

The net electric field at A is the vector sum of these two fields:

E_net = E1 + E2

Electric field at B:

\(E1 = kq1/r1^2\), where r1' is the distance from q1 to B (0.080 m)

\(E2 = k*q2/r2^2\), where r2' is the distance from q2 to B (0.060 m)

The net electric field at B is the vector sum of these two fields:

E_net' = E1' + E2'

(a) The potential at point A can be found using the formula:

V_A = kq1/r1 + kq2/r2

where r1 and r2 are the distances from q1 and q2 to A, respectively.

Substituting the given values:

V_A =\((9*10^{9} Nm^2/C^2) * (2.4*10^{-9} C) / (0.050 m) + (9*10^{9} Nm^2/C^2) * (-6.5*10^{-9} C) / (0.050 m)\)

V_A = -776 V

(b) The potential at point B can be found using the same formula as for point A, but with the distances r1' and r2':

V_B = kq1/r1' + kq2/r2'

Substituting the given values:

V_B =\((9*10^{9} Nm^2/C^2) * (2.4*10^{-9} C) / (0.080 m) + (9*10^{9} Nm^2/C^2) * (-6.5*10^{-9} C) / (0.060 m)\)

V_B = -855 V

(c) The work done by the electric field on a charge of 2.50 nC that travels from point B to point A is equal to the change in potential energy of the charge:

ΔU = q * (ΔV)

where q is the charge (2.50 nC), ΔV is the change in potential (V_A - V_B).

Substituting the given values:

\(ΔU = (2.50*10^{-9} C) * (-776 V - (-855 V))\)

ΔU = 198 nJ

Therefore, the work done by the electric field on the charge is 198 nJ.

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In dispersive materials, the angle of refraction for a light ray depends on the wavelength of the light. However, the angle of reflection from the surface of the material does not depend on the wavelengthi because reflection follows the law of reflection, which states that the angle of incidence is equal to the angle of reflection.

Law of reflection holds true for all wavelengths of light, as the reflection process does not involve a change in the medium. The phenomenon of dispersion occurs when light rays of different wavelengths travel through a medium, such as glass or water, at different speeds. This causes the refraction angle to vary with the wavelength, leading to the separation of light into its constituent colors.

In contrast, reflection involves the bouncing of light rays off a surface without changing the medium, so the angle of reflection remains the same for all wavelengths. In summary, while the angle of refraction in dispersive materials depends on the wavelength of light, the angle of reflection remains constant for all wavelengths. This difference can be attributed to the fact that reflection follows the law of reflection, while refraction in dispersive materials involves a change in the medium, causing dispersion.

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Answer:

Analyse the material required to build the instrument gauge and then keep a buffer stock of 1%

Explanation:

The right quantity to buy differs for every material. There are some materials which are very expensive and are very less used than buffer stock for such materials cannot be purchased. Usually the buffer is to be on the safe side from the shortage of the material. The buffer stock kept is around 1 to 2% for metal materials.

Answer:

0.067 meters

Explanation:

\(1 \: cm \: \: = 0.01 \:meters \\6.7 \:cm = x \:meters\\\\x = 0.067 \:meters\)

The results of this study suggest that self-assessment can be a useful tool for promoting metacognition and self-reflection.

It should be used in conjunction with other measures to provide a more complete and accurate picture of learning outcomes. The study found a very weak and non-significant correlation (r = 0.01) between college students' self-assessed improvement in critical thinking and their actual test scores, with a wide confidence interval ranging from -0.30 to 0.32.

This indicates that students' ability to assess their own learning is not very reliable or accurate, at least in the context of this study. The lack of a significant correlation suggests that students' self-assessments of their learning may not be a good indicator of their actual progress, and that other measures (such as objective tests or assessments) may be more useful in evaluating learning outcomes.

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If you press on the plunger, you increase the pressure of the air, and thus the air in the small syringe escapes out, and hens the large syringe gets expanded.

Also the colored water gets filled inside the larger syringe.

Answer: Hot air is transferred through heat being radiated from a thermal burner.

The oven absorbs air from the environment and passes it through a thermal resistance (thermal burner) to heat it and then this hot air is the one that cooks the food.

Answer:

he is wronggg

Explanation:

Answer:

Since (average) acceleration = (change in velocity)/(time it takes), the car's acceleration = (100 km/h)/(10 s) = 10 km/h/s. This means that, on the average, the car's velocity changed by 10 km/h each second.

Explanation:

Answer:

drought, floods, rip currents, tropical cyclones, wildfires

Explanation:

right on edge

Answer: 2

Explanation:

Answer:

elements

not really an explanation

Answer:

The answer is 39.3

Explanation:

Answer: The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons. The number of protons in an atom is called its atomic number. This number is very important because it is unique for atoms of a given element. All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms.

Explanation: