Is the following sentence true or false? A frame of reference is not necessary to describe motion accurately and completely.

Answer

68+84+76+80+x / 5 =78

x= it is value of his result in 5th test

x=82

Explanation:

Then you put all value from smallest to the biggest

68,76,80,82,84

median = 80

In astronomy, a dynamically hot population refers to a group of stars or other celestial objects that have high velocities and a wide range of orbits.

They are characterized by high kinetic energy and low potential energy, and are typically found in the halo of a galaxy or in the outskirts of galaxy clusters.

On the other hand, a dynamically cold population refers to a group of stars or celestial objects that have low velocities and a narrow range of orbits. They are characterized by low kinetic energy and high potential energy, and are typically found in the disk of a galaxy or in the central regions of galaxy clusters.

In summary, a dynamically hot population is one that is characterized by high velocities, wide range of orbits, high kinetic energy and low potential energy, while a dynamically cold population is one that is characterized by low velocities, narrow range of orbits, low kinetic energy and high potential energy.

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The speed of the cart at B is 16.56 m/s (ignoring the effect of friction).

Energy cannot be created or destroyed, according to the law of conservation of energy. However, it is capable of change from one form to another. An isolated system's total energy is constant regardless of the types of energy present.

According to conservation of energy:

decrease in potential energy = increase in kinetic energy

341 × 9.8 × 23.3 - 341 × 9.8 × 9.3 = 1/2 × 341 ×v²

v² = 2 × 9.8 × (23.3 - 9.3)

v = 16.56 m/s.

Hence, the speed of the cart at B is  16.56 m/s.

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The correct answer is C. amount of duckweed.

Independent variables are variables that can be manipulated or changed to observe their effects on a dependent variable. In other words, they are the input of a system. Examples of independent variables include temperature, time, and concentration. These variables are independent of each other and can be changed simultaneously or individually to observe their effects on the outcome.

The dependent variable in Chen's experiment is the amount of duckweed, which is represented on the y-axis of the graph. The independent variables in this experiment are the different water pH levels, which are represented on the x-axis. By plotting the amount of duckweed against the different water pH levels, Chen was able to analyze the effect of the different pH levels on the growth of duckweed.

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Answer:

4.09 m/s

Explanation:

1/2 * k * x^2 = 1/2 * 241 N/m * (0.024 m)^2

= 1.56 Nm

KE = 1/2 * m * v^2

v^2 = 2 * KE/m

v = √(2*1.56 Nm / 0.24 kg)

v = 4.09 m/s

The acceleration of the car is - 4.0m/s². Hence, option (B) is correct.

Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).

Initial velocity of the car: u = + 65 m/s.

Final velocity of the car: v = + 45 m/s.

Time interval: t = 5 seconds.

Hence, acceleration of the car = change in velocity/time interval

= (v - u)/t

= ( +45 - 65)/5 m/s²

= - 20/5 m/s²

= - .0m/s².

So, acceleration of the car is  - 4.0m/s².

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The author uses a variety of specific and interesting verbs, 2nd option.

Diction refers to the choice and use of words in speech or writing. It can also refer to the style or manner of speaking or writing, including the level of formality, the choice of vocabulary, and the grammatical structures used. In literature, diction is an important aspect of a writer's style, and can be used to create a certain tone or atmosphere in a text.

Formal diction, slang diction, informal diction, concrete diction, colloquial diction, and abstract diction are all examples of diction. A good diction should have words that are accurate and easy to understand. The writer used interesting verbs like "surged" and "choked' in "choked the fence" etc.

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Answer:

B

Explanation:

Because the t procedures are robust, the most important condition for their safe use is that the data can be regarded as an SRS from the population.

The fact that we have three possibilities is the most crucial requirement for their safe use. There are at least 15 samples. The distribution of the population is quite normal. The information can be viewed as a SRS from the well-known ship, thus we need to determine the best course of action. So, only small sample sizes are used when the t procedure is needed. In order to ensure that the best condition sample is chosen at random, these three The samples have a minimum of 15. Therefore, the data in this case can be viewed as a representative sample of the population. So here the answer will be the data can be regarded as an SRS from the population.

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From greatest to least, rank is

a. A=B=C

b. A=B=C

c. A=B=C

d. B, A, C

How do you find initial potential energy?

The formula for potential energy depends on the force acting on the two objects. For the gravitational force, the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.

What is the formula for initial kinetic energy?

Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

What happens to kinetic energy when you throw a ball?

When a ball is thrown straight up into the air, all its initial kinetic energy is converted into gravitational potential energy when it reaches its maximum height.

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7.58 ohms , 22.39 A and 3800 W are the correct answers .

What is resistance ?

Resistance is measured in ohms and represented by the Greek letter omega (Ω). Ohm is named after German physicist Georg Simon Ohm (1784-1854), who studied the relationship between voltage, current and resistance. He has been credited with formulating Ohm's law.

All substances resist the flow of electricity to some degree. They fall into one of two broad categories:

conductor: A material that offers very little resistance through which electrons can easily move. example:

silver, copper, gold, aluminium.

Insulator:

A substance that has a high resistance and restricts the flow of electrons. example:

Rubber, paper, glass, wood, plastic.

a) R= V^2/P = 120*120/1900 = 7.58 ohms

b) P= IV

I=1900/120 = 15.83A

I peak = sqrt2*15.83= 22.39 A

c) average power= 2*average power = 2*1900= 3800 W

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To maintain an electric potential difference and maintain a voltage, a sustained electric current needs a proper pumping mechanism.

There must be some form of pushing force in order to keep an even (or sustained) passage of electric charge across a conductor. The term "emf" for this is electromotive force. Voltage affects current, in other words. Current can be made to flow through a conductor by using a potential difference or voltage. In order for charge to go across a circuit, there needs to be a closed conducting loop and an energy source that can provide an electric potential difference. A supply of freely flowing electric charges (electrons), some sort of push to move the charges across the circuit, and a path to carry the charges are necessary for the production of an electric current.

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The resistance of wire one is three times of resistance of wire 2. The correct option is (a).

The resistance of a wire is directly proportional to length (L) and inversely proportional to the cross-sectional area.

For wire 1:

R₁ = k ×L ÷(π × (d÷2)²)

Here,

Diameter (d) and constant (k).

For wire 2:

R₂ = k × 3L ÷ (× ((3d)÷2)²)

R₂ = (1/3) × k ×L ÷(π × (d÷2)²)

R₂ = 1÷ 3R₁

R₁ = 3R₂

Hence, The resistance of wire one is three times of resistance of wire 2. The correct option is (a).

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The angle in degrees. It is the middle angle of the arc or the angle that separates the two arc radii. 180 r, where r is the radius and L is the length of an arc.

We may get the length of an arc using the following formula given an angle and a circle's diameter:

ArcLength = (angle / 360) * (2 * pi * radius)

where diameter equals 2 * radius, angle is in degrees, and

pi = 22/7.

The arc length formula for a circle is times the radius of a circle. When r is in radians, the formula for arc length can be written as arc

length = r.

Arc Length

= (/180) r,

where r is the radius and L is the length of an arc.

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0 is the correct answer .

What is angle ?

In Euclidean geometry, an angle is a figure formed by two rays, called the sides of the angle, that share a common endpoint called the vertex of the angle. The angle formed by two rays is in the plane containing the rays.  These are called dihedral angles. Two intersecting curves can also define an angle. This is the angle of the ray tangent to each curve at the point of intersection.

Angle is also used to indicate a measure of angle or rotation. This measure is the ratio of the arc length to the radius of the circle. In geometric angles, arcs are centered at vertices and bounded by edges. For rotation, the arc is centered around the rotation and surrounded by all other points and its image by rotation.

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The instantaneous rate of change of the centrifugal force as the velocity increases to 830 m/sec is 4.14×106 N/sec.

What is velocity?
Velocity is a measure of the rate of change of the position of an object over time. It is a vector quantity, meaning it has both direction and magnitude. Velocity is determined by dividing the displacement of the object by the time it took to get there.

The centrifugal force exerted on rotating turbine blades is directly proportional to the square of velocity, such that F = kv2, where k is a constant. Therefore, the rate of change of the centrifugal force with respect to the velocity (dF/dv) can be expressed as:

dF/dv = 2kv

Substituting the values given, we have

dF/dv = 2(1.21×106 N/[550 m/sec]2) × 830 m/sec

dF/dv = 4.14×106 N/sec

Therefore, the instantaneous rate of change of the centrifugal force as the velocity increases to 830 m/sec is 4.14×106 N/sec.

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a. The chromatic resolving power of such a grating in the first order is 1.8 x 10^-6 cm.

b. This grating resolve the lines of the sodium doublet (λ1 = 589.00nm, λ2 = 589.59nm ) in the first order cannot resolve the lines of the sodium doublet in the first order.

c. The shortest wavelength you could distinguish from the iron line is 587.8

d. The longest wavelength you could distinguish from the iron line is 587.8

e. The range of wavelengths you could not distinguish from the iron line?(Values of λshorter and λlonger you have calculated in two previous parts.) is 587.8002 - 587.8)nm to (587.8 - 587.8002)nm.

a. The chromatic resolving power of a diffraction grating is given by the formula: R = mλ/Δλ, where m is the order of diffraction, λ is the wavelength, and Δλ is the minimum separation of two wavelengths that can be resolved. In the first order, m = 1. Therefore, the chromatic resolving power is R = mλ/Δλ = 1 * (1/5500 cm) = 1.8 x 10^-6 cm.

b. To determine if the grating can resolve the lines of the sodium doublet, we need to compare the separation of the doublet lines (589.59nm - 589.00nm = 0.59nm) to the chromatic resolving power of the grating. If the separation is greater than the resolving power, the lines can be resolved. The resolving power is 1.8 x 10^-6 cm, which is equivalent to 1.8 x 10^-9 m. The separation of the doublet lines is 0.59 x 10^-9 m, which is less than the resolving power, so this grating cannot resolve the lines of the sodium doublet in the first order.

c. In the second order, m=2, the shortest wavelength that can be distinguished from the 587.8002 nm line of iron is 587.8002 nm - (1.8 x 10^-6 cm) = 587.8002 nm - (1.8 x 10^-9 m) = 587.8002 nm - 0.00000000018 m = 587.8002 - 0.000000018 m = 587.8.

d. In the second order, m=2, the longest wavelength that can be distinguished from the 587.8002 nm line of iron is 587.8002 nm + (1.8 x 10^-6 cm) = 587.8002 nm + (1.8 x 10^-9 m) = 587.8002 nm + 0.00000000018 m = 587.8002 + 0.000000018 m = 587.8.

e. The range of wavelengths that cannot be distinguished from the iron line of 587.8002 nm is from (587.8002 - 587.8)nm to (587.8 - 587.8002)nm.

Therefore, the correct answers are as given above

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The electric potential is zero when there is no difference in electric potential energy between two points. Therefore, the value of xx between 0 and 1.00 mm where the electric potential is zero is 0.500 mm.

The electric potential at a given point is the amount of electric potential energy per unit charge at that point in space. This can be found by measuring the electric potential difference between two points, one of which is the point at which we are interested in finding the electric potential. In this case, the electric potential at any point between 0 and 1.00 mm is zero since there is no difference in electric potential energy between the two points. Therefore, the value of xx where the electric potential is zero is 0.500 mm.

The electric potential is zero when there is no difference in electric potential energy between two points. Therefore, the value of xx between 0 and 1.00 mm where the electric potential is zero is 0.500 mm.

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The gravitational potential energy of the skier is  2,712.65 J.

The skier’s gravitational potential energy at this point is calculated by applying the following formula.

P.E = mgh

where;

The gravitational potential energy of the skier is calculated as follows;

P.E = ( 80.7 kg )  x  ( 9.8 m/s² ) x  ( 3.43 m )

P.E = 2,712.65 J

Thus, the gravitational potential energy of the skier is a function of the height and mass of the skier.

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Each contour line as you go inland represents ground that is at a constant

elevation 5 meters higher than the previous contour are:

a) Steep cliffs can be found at points A, D, and F on the map.

b) High area A is 35 meters above sea level and high area B is 50 meters above sea level.

c) The path from sea level to high point B with the most gentle slope would be to follow the contour lines from sea level upwards in a spiral pattern, starting at point A and ending at point B.

d) Following the path in part C will minimize the amount of work to climb to the top, as it follows the contour lines which represent the most gentle slopes.

What is contour line?
A contour line is a line drawn on a map that connects points of equal elevation, such as the peaks and valleys of a landscape. Contour lines are used to show the shape of the land, which can help map-readers to understand the features of the terrain and the change in elevation of the landscape.

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7.1 m/s. allows us to determine the angular velocity of the rod after it has been struck by the bullet. Calculated value: = 29.1 s-1.

The angular velocity (w), a vector quantity in uniform circular motion, is determined by dividing the angular displacement (), also a vector quantity, by the change in time (t).

If the ball is rolling without slipping, the rotational acceleration and the provided acceleration will be perpendicular at point B, and the no slip condition will be satisfied at point O by applying mr=I. nevertheless I=mr 2

α= \sr \sω

​Angle acceleration is equal to r.

If a ball rolls without slipping, the acceleration caused by rotation and the supplied acceleration will be perpendicular at point B, making the total acceleration at point A equal to a 2 + (r) 2.​

s = \s2 \s​ \s ω

Point A's velocity is 2

t=2 /2.5*2

= 7.1 m/s.

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The linear distance from the center of the pattern to the n = 4 dark fringe is 0.7142m

Dark fringes are formed by destructive interference where the waves are out of the phase. Bright fringes are formed by constructive interference where waves are in phase.

d= 1.5 x 10^-6m

D = 510 x 10^-3

n=4

lamda = 545 x 10^-9m

Distance= 4 xD x λ/d

Distance= 4 x545 x 10^-9/1.5 x 10^-6

Distance= 0.7142mm

The distance between 2 adjacent dark or bright color fringes is mainly denoted as “fringe width”, calculated as the formula: “β = λD/d”. If the “resultant amplitude” is zero then the interference is determined as “destructive”.

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The maximum force of static friction that the car's wheels can experience with the flat concrete road is  μ×5000 N.

The force of friction that the wheels experience when the car is moving is less than maximum force of static friction.

The definition of static friction is: The resistance people feel when they attempt to move a stationary object across a surface without actually causing any relative motion between their body and the surface they are moving the object across.

As the normal force = 5000 N.

The maximum force of static friction = μ×5000 N.

The force of friction that the wheels experience when the car is moving is less than maximum force of static friction.

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(a) Magnitude of the force that the left side of the groove exerts on the ball is 26.4 N. (b) Magnitude of the force that the right side of the groove exerts on the ball is 21.5 N.

(a) Magnitude of the force that the left side of the groove exerts on the ball:

The centripetal force (Fc) required to keep the ball moving in a circle can be calculated using the equation:

Fc = (m × v²) / r

m × g × h = (1/2) × m × v²

v² = (2 × g × h)

v² = 2 × 9.81 × 1.20

v² = 23.55

v = √(23.55)

v = 4.854 m/s

Now, we can find the centripetal force (Fc):

Fc = (3.00 × (4.854)²) / 1.40

Fc = 26.4 N

(b) Magnitude of the force that the right side of the groove exerts on the ball:

Weight of the ball (Fg) = m × g

Fg = 3.00 × 9.81 m/s² = 21.5 N

So, the magnitude of the force that the right side of the groove exerts on the ball (the normal force) is approximately 21.5 N.

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Nuclei of the same element can have different values of A and Nuclei of the same element can have different values of N and Nuclei of the different elements can have the same values of A.

On the basis of the 1909 Geiger-Marsden gold foil experiment, Ernest Rutherford identified the atomic nucleus in 1911, which is the compact, dense region made up of protons and neutrons at the heart of an atom.

There are 118 species of atoms listed in the periodic table of elements, and each of these can be found (either naturally or artificially) in several iterations with various neutron counts, leading to a total of around 3,000 distinct atomic nuclei.

Both nuclei are held together by the electron, which "orbits" them. We have a molecular ion because the total charge is undoubtedly non-zero. According to Wikipedia, this system is referred to as the dihydrogen cation and goes by the symbol H+2.

the solution is

The proton ratio (Z) for a particular element is fixed. The mass number can vary depending on the number of neutrons (N) in the same element and other elements (A).

Atoms having the same Z and different N (and hence different A) are called isotopes. They are usually forms of the same element.

Sometimes atoms of different element can have the same mass number (A) but different atomic number (Z) and neutron number (N) that makes up the same mass number (A). They are called isobars

Also,atoms of different element can have the same neutron number (N) but different atomic (Z) and mass number (A). they are called isotones

therefore

A) Option 3 and 4

B) Option 3 and 4

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If you walk 5 meters north, 2 meters west, 4 meters south, and 7 meters east....then the displacement is      [tex]\sqrt{26}[/tex].

A displacement is a vector whose length is the shortest distance from the initial to the final position of a point P undergoing motion.

Solution:

As per the given statement when  you walk 5 meters north, 2 meters west, 4 meters south, and 7 meters east... then you will be resulting in forming a right angled triangle from origin to ending point.

That right angled triangle will have

base=5m

perpendicular=1cm

hypotenuse=?

to find hypotenuse we use Pythagoras theorem:

[tex]h^{2}[/tex]=[tex]b^{2}+ p^{2}[/tex]

On putting values we get

[tex]h^{2}[/tex]=[tex]b^{2}+ p^{2}[/tex]

h=[tex]\sqrt{25+1}[/tex]

h=[tex]\sqrt{26}[/tex]

Hence, the displacement is      [tex]\sqrt{26}[/tex].

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A. 40 cm

We can use Coulomb's law to calculate the distance between the two Cheetos:

F = k * (q1 * q2) / r^2

where F is the force acting on the first Cheeto, q1 and q2 are the charges on each Cheeto, k is the Coulomb constant and r is the distance between the two Cheetos.

Given that the force acting on the first Cheeto is 5.73 E−1 N, the charge on the first Cheeto is 1.2 E−5 C, the charge on the second Cheeto is 2.5 E−6 C and the Coulomb constant is 8.99 E9 N*m2/C2.

We can rearrange the equation to solve for the distance r:

r = (k * q1 * q2 / F)^(1/2)

r = (8.99 E9 N*m2/C2 * 1.2 E−5 C * 2.5 E−6 C / 5.73 E−1 N)^(1/2)

r = 0.04 m

So the distance between the two Cheetos is 40 cm.

Answer: Condensation of liquid sweat on the skin

Explanation:

Consider the first-order decomposition of A molecules (red spheres) in three vessels of equal volume - A) 2:4:3 , B) 1:1:1 , C) increase by a factor of 2, D) remain the same.

What is first-order decomposition ?

When the reaction's pace is proportional to the concentration of the reactant, it is referred to as a first-order reaction. On the other hand, as the concentration rises, the reaction rate doubles. One or two reactants are used in the decomposition process, an illustration of a first-order reaction.

What is molecules ?

A molecule is a collection of at least two chemically bound atoms from the same or distinct elements. One molecule of water, for instance, is created when two hydrogen atoms and one oxygen atom combine.

Therefore, the first-order decomposition of A molecules (red spheres) in three vessels of equal volume - A) 2:4:3 , B) 1:1:1 , C) increase by a factor of 2, D) remain the same.

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Answer: C.

Explanation: The core or Nucleus of an atom contains Protons and Neutrons. A proton has a +1 charge while a Neutron is a Neutral or 0 charge. Electrons orbit the Nucleus and have a -1 charge.

a)The radius is 2.6 cm and b) The mass is measured to 4.76 g/cm³ and c)0.00476 kg/m³  is the density kg/m³ in kg/m³.

The quantity of matter per unit volume is referred to as densities (volumetric mass density or specific mass). Density is most frequently represented by the lowercase Greek letter rho, but the Latin letter D is also acceptable. Density is calculated mathematically by dividing mass by volume.

a. The formula: gives the surface area of a spherical.

A = 4 * pi * r²

where A is the surface area, pi is approximately 3.14, and r is the radius of the sphere.

Given the surface area A = 85 cm², we can write the equation for the radius as:

85 = 4 * pi * r²

Solving for r, we get:

r = sqrt(85 / (4 * pi)) = sqrt(85 / 12.56) = sqrt(6.77) = 2.6 cm (approx)

b. The density of an object is given by the formula:

density = mass / volume

The following formula determines a sphere's volume:

V = (4/3) * pi * r³

where V is the volume and r is the radius of the sphere.

Given the mass of the ball M = 160 g, we can calculate the density as:

density = mass / volume = 160 g / [(4/3) * pi * (2.6 cm)^3] = 160 g / (33.51 cm^3) = 4.76 g/cm³

c. To convert the density from g/cm³ to kg/m³, we need to divide the value by 10³.

density = 4.76 g/cm³ / (10³) = 0.00476 kg/m³

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