whu is it important to mave regular supervision of weights and measurements in the market​

Answer:

no

Explanation:

ans should be correct

Explanation:

Independent Variables are constants. They do not affect the result of the experiment.

In this problem, Jamie used Lysol, Clorox, Pinesol, and just water for cleaning her kitchen counter. For each cleaner, he put 5 milliliters of grape juice on the counter, sprayed the cleaner, and wiped it with one paper towel.

It means, the cleaning products like Lysol, Clorox, Pinesol, water did not depend on anything. They remain constant throughout the experiment. Also, paper towel comes under Independent Variables.

Answer:

No need for explanaxition

Explanation:

Answer:

two attracting magnets are released while moving away from one another.  

Explanation:

Answer:the correct answer is: two attracting magnets are released from hole moving towards one another

Explanation:

The speed of the police car when it catches up to the speeder is 37.5 m/s.

How to determine speed?

To solve the problem, we can use the following kinematic equation:

v = u + at

where:

v = final velocity (unknown)

u = initial velocity of the police car (0 m/s)

a = acceleration of the police car (7.5 m/s²)

t = time elapsed after the police car starts accelerating (5.0 s)

We can also convert the speed of the car from km/h to m/s:

108 km/h = (108 km/h) x (1000 m/km) x (1 h/3600 s) = 30 m/s

Now we can substitute the values into the equation:

v = 0 + (7.5 m/s²) x (5.0 s)

v = 37.5 m/s

Therefore, the speed of the police car when it catches up to the speeder is 37.5 m/s.

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Mary Lou traveled a total distance of 5.75 miles and had an average speed of approximately 1.92 miles per hour.

Mary Lou's entire voyage lasted 3 hours and involved several stops. She first went 1 mile north to the bakery, then 2.5 miles south to get her hair cut, followed by another 1.5 miles south to the library to check out a book. Finally, she traveled 0.75 miles north to meet her friend.

To determine the total distance Mary Lou traveled, we need to add up the distances for each leg of her journey. She went 1 mile north, then 2.5 miles south, then 1.5 miles south, and finally 0.75 miles north. Adding these distances together gives us a total of 5.75 miles.

Next, we can calculate Mary Lou's average speed by dividing the total distance traveled by the total time taken. Since she traveled 5.75 miles in 3 hours, her average speed can be calculated as 5.75 miles divided by 3 hours, which equals approximately 1.92 miles per hour.

In summary, Mary Lou traveled a total distance of 5.75 miles and had an average speed of approximately 1.92 miles per hour.

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Amphibians retain a set of gills their whole lives that help them to breathe in the water. So, the correct option is D.

Amphibians are defined as the class of cold-blooded vertebrates which is made up of frogs, toads, salamanders, newts, and caecilians. All amphibians that spend part of their lives in water and part of their lives on land.

Amphibians are born with gills, and some outgrow them when they become adults while others retain them for their entire lives.

Thus, the correct option is D.

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The base of table is "1.08856 m" far away from the ball land.

Given:

Distance travelled by ball,

Initial velocity,

Acceleration,

Constant speed,

As we know the formula,

→ \(S = ut+\frac{1}{2}at^2\)

By substituting the values, we get

→ \(1.2=\frac{1}{2}\times 9.8t^2\)

→ \(1.2 = 4.9 t^2\)

→    \(t = \sqrt{\frac{1.2}{4.9} }\)

→      \(= 0.4948 \ seconds\)

Let,

→ \(x = 2.2\times t\)

     \(= 2.2\times 0.4948\)

     \(= 1.08856 \ m\)

Thus the solution above is right.

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Given,

The length of the pipe, L=1.8 m

Speed of the sound, v=340 m/s

To form the standing wave with the longest wavelength, the number of nodes of the thus formed standing wave should be equal to 1.

The wavelength of the standing wave created in a closed-end pipe is given by,

On substituting the known values,

Thus the longest possible wavelength is 7.2 m

The frequency of this standing wave is given by,

On substituting the known values,

Thus the frequency of this standing wave is 47.22 Hz.

The voltage expression for vy in the given RC op amp circuit with a stepped voltage can be obtained by considering the time constant. If the time constant is 4-8, and the expression for the voltage across the resistor R is 8 mF, where T is in ms, the expression for vy can be derived.

In the given RC op amp circuit, the voltage across the resistor R is given by the expression vy = vis * (1 - e^(-t/RC)), where vis is the input voltage, t is the time, R is the resistance, and C is the capacitance.

Given that the time constant is 4-8, we can assume that the product of R and C is equal to this time constant. Let's assume RC = τ, where τ lies between 4 and 8.

Substituting RC = τ and the given expression for vis as 8 mF (where T is in ms), we can write the voltage expression as vy = 8 * (1 - e^(-t/τ)).

This expression represents the voltage across the resistor R, labeled as vy in the op amp circuit, as a function of time and the time constant τ.

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Answer:

He should swim at least three times a week at the community pool to build stamina.

Explanation:

Answer: they vibrate faster and becomes hotter

Explanation:

.

The object's velocity-time graph is provided, and we need to determine the true statement about the motion of the object.

From the velocity-time graph, we can observe the following key features. Firstly, the graph shows a positive constant slope, indicating a constant positive velocity. This implies that the object is moving in a straight line with a consistent speed in a positive direction. Secondly, the graph is a straight line without any changes in slope, indicating that the velocity remains constant throughout the object's motion.

Based on these observations, the true statement about the object's motion is that it is moving with a constant velocity in a straight line. The graph's linear nature and constant slope suggest that the object maintains the same speed and direction without any changes in its motion over time.

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Each solution tested has its advantages and disadvantages. The most effective solution depends on the situation and the amount of oil that needs to be removed from the water.

The three solutions tested to remove oil from water are scooping the oil with a spoon, absorbing the oil with a paper towel, and using soap to break up the oil. Each solution has its advantages and disadvantages. Scooping the oil with a spoon is an effective solution to remove a significant amount of oil quickly. However, it is not a practical solution for removing a large amount of oil. The disadvantage is that it spreads the oil around the surface of the water and leaves some oil in the water. Absorbing the oil with a paper towel can effectively remove a lot of oil. The advantage is that it removes some oil from the water, leaving it relatively clean. However, it also picks up a lot of water and can't get all of the oil. Using soap to break up the oil is a good solution that removes all of the oil from the water. The advantage is that it removes all of the oil from the water, leaving it clean. However, the disadvantage is that it disperses the oil on the surface of the water, making it harder to remove from the sides of the bowl. In conclusion, each solution tested has its advantages and disadvantages. The most effective solution depends on the situation and the amount of oil that needs to be removed from the water.

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Answer:

True

Explanation:

Newton's first law of motion states that an object at rest will stay at rest unless acted upon by an outside force.

Answer:

When a large truck pushes a small car with a given force, the small car is applying an equal and opposite force on the truck. Newton's first law of motion states that an object at rest will stay at rest unless acted upon by an outside force.

Explanation:

so its true

Answer:

the answer is C

Explanation:

this is because pressure is defined as the force acting per unit area thus,

the lower the area the higher the pressure

this can be explained by This,

will you experience pain if touch the tip of the needle or your pen

the area in the needle is less thus, more pressure

hope this helps,

The work done required to pump all of the water (a) over the side is 6.8094 × 10⁶ J and (b) out of an outlet 2 m over the side is 11.349 × 10⁶ J.

The total amount of work done required to pump all of the water in a circular swimming pool with a diameter of 14 m whose circular side is 3 m high, and the depth of the water is 1.5 m can be calculated as follows:

(a) Pump all of the water over the side:

We have been given that the circular swimming pool has a diameter of 14 m. The depth of the water is 1.5 m. So the radius of the pool can be calculated as:

r = d/2 = 14/2 = 7 m

The volume of the water that needs to be pumped out of the pool is given by the formula:

Volume of water = πr²h

Where h is the depth of the water.

V = πr²h= 22/7 × 7 × 7 × 1.5= 231 m³

The mass of water that needs to be pumped out of the pool can be calculated as follows:

Mass of water = Volume of water × Density of water = 231 × 1000= 231000g

The gravitational force on the water can be calculated as follows:

Gravitational force on water = Mass of water × Acceleration due to gravity = 231000 × 9.8= 2269800 N

Work done in pumping all the water over the side can be calculated as follows:

Work done = Gravitational force on water × Height from the surface to the top of the pool= 2269800 × 3= 6.8094 × 10⁶ J

(b) Pump all of the water out of an outlet 2 m over the side:

Work done in pumping all the water out of an outlet 2 m over the side can be calculated as follows:

Work done = Gravitational force on water × Height of outlet from the surface= 2269800 × 2= 4.5396 × 10⁶ J

Therefore, the total amount of work (in joules) required to pump all of the water over the side and pump all of the water out of an outlet 2 m over the side of the pool is 6.8094 × 10⁶ + 4.5396 × 10⁶ = 11.349 × 10⁶ J.

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On a molecular level, the difference in the specific heat capacity of water and copper explains why copper is heated to a higher final temperature than water when the same amount of heat is added to equal masses of both substances at the same temperature.

Specific heat capacity is the amount of heat required to raise the temperature of a substance by one degree Celsius per unit mass.

Copper has a lower specific heat capacity than water, meaning that it requires less heat to raise its temperature by one degree Celsius than water does. As a result, when the same amount of heat is added to equal masses of water and copper, the temperature of copper increases more rapidly than that of water. This is because copper can absorb the same amount of heat more efficiently than water, which leads to a higher final temperature for copper than water.

Therefore, The difference in the specific heat capacity of water and copper on a molecular level explains why copper reaches a higher final temperature than water when the same amount of heat is added to equal masses of both substances at the same temperature.

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The maximum conductor lifts possible, without applying undue strain to the tie wires at the adjacent poles, occurs when the lowest point of conductor sag is right at the adjacent poles is true.

The strain is defined as the amount of force applied to the body, and deformation takes place. It is obtained by taking the ratio of change in the dimensions of the body to the initial dimensions of the body.

Thus, from the given statement, without applying the force, the conductor may lift due to the magnetic poles attached to the conductor. Hence, the given statement is True.

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Answer:

B is the correct answer to the order

The smallest thickness of the soap film for which the reflections undergo fully constructive interference is approximately \(5.517 * 10^{-7}\) meters or 551.7 nm.

To determine the smallest thickness of the soap film for which the reflections undergo fully constructive interference, we can use the equation for constructive interference in thin films:

2t = m * λ / (n_film - n_air)

Where:

t = thickness of the film

m = order of the interference (1, 2, 3, ...)

λ = wavelength of the incident light

n_film = index of refraction of the film

n_air = index of refraction of air

In this case, we want the reflections to undergo fully constructive interference, which corresponds to the first-order interference (m = 1).

Given:

λ = 617.0 nm =\(617.0 * 10^{-9} m\)

n_film = 1.56

n_air ≈ 1 (approximating the index of refraction of air as 1)

Substituting the values into the equation:

2t = (1 * λ) / (n_film - n_air)

\(2t = (1 * 617.0 * 10^{-9} m) / (1.56 - 1)\)

\(2t = (617.0 * 10^{-9} m) / 0.56\)

\(t = (617.0 * 10^{-9} m) / (2 * 0.56)\)

t ≈ \(5.517 * 10^{-7} m\)

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Option C) The experiment in which the speed of the object was changed

is only statement that doesn't satisfy the given data as shown below:

The above statement can be verified using the calculation:

Formula for centripetal force(F) = \(\frac{mv^2}{r}\)

where m is mass of object , v is speed of object and r is radius of the circular motion.

For option A) when only mass of object is changed and rest all are same.

so F = k*m where k = \(\frac{v^2}{r}\) as both are constant

=> \(\frac{F_1}{F_2}\) = 4.04/8.08 = 0.5

and \(\frac{m_1}{m_2}\) = 0.1/0.2 =0.5

so \(\frac{F_1}{F_2} = \frac{m_1}{m_2}\)

similary \(\frac{F_2}{F_3} = \frac{m_2}{m_3}\) and hence data is correct for option A)

For option B) when only radius of object is changed and rest all are

same.

so F = k/r where k = \(m*v^2\) as both are constant

=> \(\frac{F_1}{F_2}\) = 4.04/8.08 = 0.5

and \(\frac{r_2}{r_1}\) = 0.3/0.6 =0.5

so \(\frac{F_1}{F_2} = \frac{r_2}{r_1}\)

so both are same , similary \(\frac{F_2}{F_3} = \frac{r_3}{r_2}\) and hence data is correct for option B

For option C) when only speed of object is changed and rest all are

same.

so F = k*\(v^2\) where k = \(\frac{m}{r}\) as both are constant

=> \(\frac{F_1}{F_2}\) = 4.04/9.09 = 0.44444

and \(\frac{v_1^2}{v_2^2}\) = 4.08/9.181 =0.44439

so ,\(\frac{F_1}{F_2}\) ≠ \(\frac{v_1^2}{v_2^2}\)

and hence data is not correct for option C

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Complete question:

A student conducts three experiments to determine how certain quantities influence the centripetal force responsible for an object to spin in a horizontal circle. The student uses one end of a string to attach the object while the other end is connected to a force sensor that allows the student to change the tension on the string, as shown in the figure. The student records data from the three experiments in the table above. Which of the following experiments, if any, collected data that do not agree with the expression for the net centripetal force on the object?

A)The experiment in which mass was changed

B)The experiment in which the radius of the circular path was changed

C)The experiment in which the speed of the object was changed

D)All the data are expected.

Answer:

0.5 m/s2

Explanation:

accelration formula : final velocty - starting velocity divided by time

Answer:

v = 4.79 10³ m / s

Explanation:

For this exercise we will use the universal law of gravitation and Newton's second law

          F = G M m / r²

where G is the gravitational constant, m the mass of the satellite, M the mass of the Earth, r the distance from the center of the planet to the satellite

           F = m a

since the satellite has a circular path, the acceleration is centripetal

          a = v² / r

we substitute

          G M m / r² = m v² / r

           G M / r = v²

We calculate

          v² = 6.67 10⁻¹¹ 5.98 10²⁴ / 6.96 10⁶

          v = √ (22.94 10⁶)

          v = 4.79 10³ m / s

Answer:

7570 m/s

Explanation:

take the square root of: 6.67E-11× 5.98E24/6.96E6

Since cost = 0 €, the value of sinθ will be 1.  Recall that the Pythagorean identity for sine and cosine states that sin²θ + cos²θ = 1. So, sin²θ = 1 - cos²θ. Given cost=0 €,cosθ=0. Substituting cosθ = 0, we get;sin²θ = 1 - cos²θ.  sin²θ = 1 - 0² = 1Therefore,sinθ = √1 = 1  

This means that sin28 = 1  Since sin20 lies in the first quadrant (0° to 90°), it will have a positive value. To determine sin20, we can use a calculator or reference a trigonometric table. To the nearest tenth of a degree, sin20 is 0.3 and it lies in the first quadrant.

An identity that expresses the Pythagorean theorem in terms of trigonometric functions is known as the Pythagorean trigonometric identity, or simply the Pythagorean identity. It is one of the fundamental relations between the sine and cosine functions, along with the sum-of-angles formulas. The angle can be any real value, and the equation is s i n 2 + c o s 2 = 1. Given both the sine value and the quadrant in which the angle is located, we can use the Pythagorean identity to determine the angle of cosine.

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Answer:

A. an ion with a positive charge

Answer:

A) An ion with a positive charge

Answer:

the momentum is 50 kg m/s

Explanation:

The computation of the momentum is shown below;

As we know that

Momentum = mass × velocity

where

mass = 5 kg

And, the velocity is 10 m/s

So, the momentum is

= 5 × 10

= 50 kg m/s

Hence, the momentum is 50 kg m/s

The answer is  24.84kJ.

We apply the expression for the work done by the heat engine is,

\(W=E_{i n}-E_{o u t}\). Putting all given values in the equation we get the final answer.

What is heat engine?

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Answer:

Physical science

Explanation:

Answer:

question is incomplete