How can you minimize the error while measuring the length of the body? Write any two precautions to be followed. please fast...... emergency.. ​

Answer:

Explanation:

From the given information:

the car's momentum = momentum of the truck

∴

(a) 816 kg × v = 2650 kg × 16.0 km/h

v = (2650 kg × 16.0 km/h) /  816 kg

v = 51.96 km/hr

(b) 816 kg × v = 9080 kg × 16.0 km/h

v = (9080 kg × 16.0 km/h) /  816 kg

v = 178.04 km/hr

Answer:

i think its D

Explanation:

Answer:

The highness or lowness of a sound is perceived as pitch. Pitch is a perceptual property of sound that allows us to distinguish between sounds that have the same loudness and duration, but differ in their frequency content. The pitch of a sound is determined by the frequency of the sound wave, with higher frequencies producing higher pitches and lower frequencies producing lower pitches. The pitch is what makes a sound distinguishable and is important in music, language, and communication.

Answer: Brainliest?

Explanation:

Isobars and isotherms are both types of contour lines used to represent data on weather maps, specifically for atmospheric pressure and temperature, respectively.

The similarities between isobars and isotherms are:

Both are contour lines that connect points of equal value on a map.

Both are used to depict weather patterns and conditions.

Both help to identify areas of high and low values.

The differences between isobars and isotherms are:

Isobars connect points of equal atmospheric pressure, whereas isotherms connect points of equal temperature.

Isobars are measured in units of pressure such as millibars, while isotherms are measured in units of temperature such as degrees Celsius or Fahrenheit.

Isobars are typically used to show pressure patterns associated with wind, while isotherms are used to show temperature patterns.

Isobars are often used to forecast weather conditions, including the movement and intensity of storm systems. Isotherms are used to identify areas of warm and cold air masses, which can affect local weather patterns.

In summary, both isobars and isotherms are useful tools for understanding weather patterns, but they represent different types of data and are used for different purposes.

Isobars and isotherms are both concepts used in meteorology and climatology to represent important variables that help to describe atmospheric conditions. While they share some similarities, they also have several key differences.

Isobars refer to lines of equal pressure, meaning they connect points on a map or graph where the atmospheric pressure is the same. Isobars are drawn on weather maps to indicate areas of high and low pressure, and to show the general movement of air masses. When isobars are closely spaced, it indicates a steep pressure gradient, which can result in strong winds.

On the other hand, isotherms refer to lines of equal temperature, meaning they connect points on a map or graph where the temperature is the same. Isotherms are often drawn on weather maps to show the boundaries between warmer and cooler air masses, and to indicate areas where temperature changes rapidly.

One similarity between isobars and isotherms is that they are both used to describe atmospheric conditions in terms of spatial variation. They are also both used to infer information about the movement of air masses and the development of weather patterns.

However, there are also some key differences between isobars and isotherms. The most obvious difference is that isobars represent pressure while isotherms represent temperature. Additionally, while isobars are generally oriented parallel to each other and indicate the direction of winds, isotherms are typically oriented perpendicular to isobars and indicate the location of temperature gradients. Finally, while isobars are more commonly used to describe weather conditions associated with areas of high and low pressure, isotherms are often used to identify the location of fronts and other weather boundaries.

In summary, isobars and isotherms are similar in that they both describe atmospheric conditions in terms of spatial variation, and can be used to infer information about the movement of air masses and the development of weather patterns. However, isobars represent pressure and are oriented parallel to each other, while isotherms represent temperature and are oriented perpendicular to isobars.

The bike is travelling at 22.5 m/s after 2.5 s

This is defined as the rate of change of velocity which time. It is expressed as

a = (v – u) / t

Where

a = (v – u) / t

a = (15 – 0) / 5

a = 3 m/s²

a = (v – u) / t

3 = (v – 15) / 2.5

Cross multiply

v – 15 = 3 × 2.5

v – 15 = 7.5

Collect like terms

v = 7.5 + 15

v = 22.5 m/s

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Answer:

D. The airplane will turn towards the east

Explanation:

If the airplane is thrown straight towards the north, the window which is moving from left (west) to right (east) the wind will knock the plane towards the right (east) since thats the way it is blowing.

Taking ratio of W & w. ≈ 6 . w = 1/6 W. Therefore , Weight of an object on the moon is 1/6 of its weight on the earth.

Answer:

Explanation:

Displacement vector along x axes = 4.5 - 2.5 = 2 m

Displacement vector along y axes = 3 - 2 = 1 m

Displacement vector along z axis = 3.5- 4 = - 0.5 m

Displacement vector = 2 i + j - 0.5 k m

Two objects are held close together. When they are released, they move toward one another. The conclusion is supported by this evidence is  the objects have opposite charges.

An electric charge is a physical property that causes matter to experience a force when in close proximity to other electrically charged matter. There are two types of electric charges: positive and negative. Protons, which are positively charged, and electrons, which are negatively charged, are subatomic particles that make up matter.

In general, the protons and neutrons in the nucleus of an atom have a net positive charge, while electrons, which orbit the nucleus, have a net negative charge. The charges of these subatomic particles are indicated by the symbols "p" for proton, "n" for neutron, and "e" for electron.

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Answer:

When the spring compresses, elastic potential energy increases.

Answer:

the answer is b

Explanation:

elastic potential energy

Answer:

Because the half-life is as long as Earth has existed, virtually all rocks on Earth still have most of their uranium-238. So, measurements can easily be obtained.

Explanation:

exact answer from pluto/ edmentum

The significant part of the chemical composition of rocks is uranium. The half -life of uranium is close to the age of earth. Hence, by measuring the uranium content in rocks we can predict its age.

Uranium is 92nd element in periodic table. It is an actinide element. All the actinides are radioactive in which the most common is uranium. They all undergo radioactive decay process. Radioactive decay is a first order reaction. The rate constant K can be written as:

k = 1/t ln (W0/Wt)

where t is the tome of decay, W0 be the initial amount and Wt is the amount after time t.

here k = 0.693/t1/2

By this relation we can find t the age of a substance, if know the amounts and half life t1/2. Uranium is present in rocks and minerals. Uranium undergo nuclear decay and will forms its isotopes or new products.

Thus, by measuring the current amount of uranium in rocks by knowing the half life of uranium we can predict the age of rocks.

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Ans:

C

Explanation:

because it is moving down the stairs

A spring travelling down a flight of stairs has kinetic energy.

Since it is moving, it would be a spring moving down a set of steps. A stretched spring, a compressed spring, and a spring at the top of a set of steps are all in motion.

Kinetic energy is a type of power that a moving object or particle possesses.

An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force. A moving object or particle has kinetic energy, which depends on both its mass and its rate of motion.

Therefore, A spring travelling down a flight of stairs has kinetic energy.

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The muzzle horizontal velocity of the dart gun that shoots the dart to a target that is 3 m away is 7.34 m/s.    

We can calculate the horizontal velocity of the dart gun with the following kinematic equation:

\( x = v_{0_{x}}t + \frac{1}{2}at^{2} \)   (1)  

Where:

x: is the total distance = 3 m

\( v_{0_{x}}\): is the horizontal component of the initial velocity =?

t: is the time

a: is the acceleration = 0 (there is no acceleration in the horizontal motion of the dart gun)

Since we also know the height, we can use this other equation:

\( y_{f} = \frac{1}{2}gt^{2} \)    (2)

Where:

g: is the acceleration due to gravity = 9.81 m/s²

By solving equation (1) for t, and entering into (2) we have:

\( y = \frac{1}{2}gt^{2} = \frac{1}{2}g(\frac{x}{v_{0_{x}}})^{2} \)  

By solving for \(v_{0_{x}}\):

\( v_{0_{x}} = \sqrt{\frac{gx^{2}}{2y}} = \sqrt{\frac{9.81 m/s^{2}*(3 m)^{2}}{2*0.82 m}} = 7.34 m/s \)

Therefore, the muzzle velocity of the dart gun is 7.34 m/s.

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Answer:

The correct answer is : option B. controlled experiments.

Explanation:

A scientific experiment which deals with a single variable at a time and compared the independent variable to a controlled variable after measuring the change in dependent variable.

It is a very simple and easy test for single variable. In these experiments subjects are divided in two groups one one, with independent variable and other variable.

Thus, the correct answer is : option B. controlled experiments.

The number of people you will stack to reach the top of the CN Tower (553 m) is 316 people

We'll begin by converting 175 cm to m. This can be obtained as illustrated below:

100 cm = 1 m

Therefore,

175 cm = (175 cm × 1 m) / 100 cm

175 cm = 1.75 m

Thus, 175 cm is equivalent to 1.75 m

The number of people needed to be stacked to get to the top of the CN tower can be o btained asfollow:

Number of people needed = Height of tower / height of a person

Number of people needed = 553 / 1.75

Number of people needed = 316 people

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The frictional force acting on a 20 kg block that is being pushed with 50 N of force and the weight of the block are calculated as follows:Frictional force:The frictional force is a force that opposes motion between two surfaces that are in contact. It's typically symbolized by the letter f.

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Answer:

The answer is "Option C".

Explanation:

It's evident from the figure below that after thirty minutes, not no more hydrogen can be created because all of the reactants have converted into products.

hydrogen gas created in cm cubes per period x = 20 seconds, y = 45 centimeters squared, and so on.

A reaction's terminus (the graph's flat line) indicates that no further products are being created during the reaction.

Answer:

Explanation:

F = m*a = (0.5)*15 = 7.5 N

5.32m/s must be  the constant speed of the second swimmer in order to catch up to the leader at the end of the pool.

The equation for distance for a constant velocity is given by:

x = v * t, x = distance, v = velocity, t = time

1. The time for the first swimmer to reach the end of the pool:

t₁ = x/v₁

= 41m / 5.0m/s

=8.2s

2. The second swimmer will be at the same location at a time t₂, from where she has 0.50s less to reach the end of the pool than the first swimmer. The velocity for the other swimmer will be:

v₂ = x/t₂

= 41 / (t₁ - 0.50s) =  41m / 7.7s

=5.32m/s

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The tax rate you will pay is displayed in tax brackets for each category of taxable income.

Thus, For instance, in 2022, the first $10,275 of your taxable income is subject to the lowest tax rate of 10% if you are single.

Up until the maximum amount of your taxable income, the following portion of your income is taxed at a rate of 12%.

As taxable income rises, the tax rate rises under the progressive tax system. Overall, this has the result that taxpayers with higher incomes often pay a greater rate of income tax than taxpayers with lower incomes.

Thus, The tax rate you will pay is displayed in tax brackets for each category of taxable income.

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The mass of 2nd particle  be 4.97×10⁻⁷ kg.

The common charge can not be determined.

An object's push or pull is seen as exerting a force. The interaction of the objects produces push and pull. You can also use words like stretch and squeeze to describe force.

The definition of force in physics is: The push or pull on a mass-containing item changes its velocity.

Given that: two equally charged particles are held apart when they are released from rest. So force acting on them is same.

For 1st particle:

Mass: m₁ =  6.31×10⁻⁷ kg.

Acceleration: a₁ =  7.22 m/s².

For 2nd particle:

Acceleration: a₂ =  9.16 m/s².

Mass: m₂ = ?

As force acting on both particle is same.

m₁a₁ = m₂a₂

⇒ m₂ = m₁a₁/a₂ = ( 6.31×10⁻⁷ kg)×( 7.22 m/s²)/( 9.16 m/s²) = 4.97×10⁻⁷ kg.

So,   the mass of 2nd particle  be 4.97×10⁻⁷ kg.

As there has no mention of distance between them and which type of particle it is, common charge can not be determined.

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(1) The resulting velocity of both train cars after they hit is 10 m/s.

(2) The momentum of the first train before and after collision is 12,500 kgm/s and 5,000 kgm/s respectively.

The given parameters;

(1)

The final velocity of the both trains after the collision is obtained  by applying the principle of conservation of linear momentum for inelastic collision.

m₁u₁ + m₂u₂ = v(m₁ + m₂)

where;

v is the final velocity of the two trains after collision.

The resulting velocity of both train cars after they hit is calculated as

(500 x 25) + (750 x 0) = v(500 + 750)

12500 = 1250v

\(v = \frac{12500}{1250} \\\\v = 10 \ m/s\)

(2)

The momentum of the first train before collision;

\(P_1 = m_1 u_1\\\\P_1 = 500 \times 25\\\\P_1 = 12500 \ kg.m/s\)

The momentum of the first train after collision;

\(P_1_f = m_1 v\\\\P_1_f = 500 \times 10\\\\P_1_f = 5,000 \ kg.m/s\)

The momentum of the second train before collision;

\(P_2 = m_2 u_2\\\\P_2 = 750 \times 0\\\\P_2 = 0 \ kg.m/s\)

The momentum of the second train after collision;

\(P_2_f = m_2 v\\\\P_2_f = 750 \times 10\\\\P_2_f = 7,500 \ kg.m/s\)

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Answer:

Trabajo = Δ E

Explanation:

Podemos escribir esta declaración como una ecuación que hace que sea muy fácil ver la relación: Trabajo = Δ E, donde E es energía, y la letra griega Delta significa ‘cambio en’. Entonces leemos esto como: trabajo = cambio de energía. Esto nos ayuda a comprender por qué no se realiza ningún trabajo en una pared que no se mueve.

The work- energy theorem states that the work done by the sum of  forces acting on an object is  equal to  the change in the kinetic energy of the object.

According to work -energy theorem, the force resulting in a work done which is equal to the change in kinetic energy of the object. When a force applied on a body results in a displacement of the body, it is said to be work done on the body.

Kinetic energy of an object is the energy generated by virtue of its motion. It related to the mass and velocity as written below:

Ke  = 1/2 mv²

Let, Vi be the initial velocity and Vf be the final velocity, then the change in kinetic energy is written as:

ΔKe =  1/2 mVf² -  1/2 mVi²

According to wok energy theorem, the work done is equal to the this kinetic energy change.

Hence, W = ΔKe.

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The acceleration due to gravity near the surface of the hypothetical planet is 3.02 m/s².

The formula for acceleration due to gravity is:

g = GM/r² Where, g = acceleration due to gravity G = universal gravitational constant M = mass of the planet r = radius of the planet

In this case, since the mass of the hypothetical planet is the same as that of Earth, we can use the mass of Earth instead of M.

Therefore, g is proportional to 1/r².

So, using the ratio of radii given (1.8), we can write:

r = 1.8 x r Earth, where r Earth is the radius of Earth.

Substituting this value of r in the formula for acceleration due to gravity, we get:

g = GM/(1.8 x r Earth)² = GM/(3.24 x rEarth²) = (1/3.24)GM/rEarth²

We know that the acceleration due to gravity on Earth (g Earth) is 9.8 m/s².

Therefore, we can calculate the acceleration due to gravity on the hypothetical planet (gh) as follows:

gh = (1/3.24) x g Earth = 3.02 m/s²

Thus, the acceleration due to gravity near the surface of the hypothetical planet is 3.02 m/s².

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B. False, the surface area of the cone and the cylinder is not the same.

The area or region that an object’s surface occupies is known as its surface area. Volume, on the other hand, refers to how much room an object has. Geometry has numerous shapes and dimensions, including spheres, cubes, cuboids, cones, cylinders, etc. Each form has its own volume and surface area.

If the slant height of the cone is 2r, then we can use the Pythagorean theorem to find the radius of the cone:

l² = (2r)² - r²

l² = 3r²

l = r√3

Using this value for the radius of the cone, the formula for its surface area becomes:

A(cone) = πrl + πr²

A(cone) = π(r)(r√3) + πr²

A(cone) = πr²(1 + √3)

For the cylinder, we can use the given height and radius to find its surface area:

A(cylinder) = 2πrl + 2πr²

A(cylinder) = 2π(r)(r) + 2π(r²)

A(cylinder) = 2πr²(1 + r)

Comparing the two surface area formulas, we can see that they are not equal in general, since each figure's coefficient in front of the second term (πr²) is different.

Therefore, we cannot conclude that the two figures have the same surface area based on the information.

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Answer:

The penny will hit the ground at 6.39 seconds

Explanation:

Free Fall

The penny is dropped from a height of y=200 m. The equation of the height on a free-fall motion is given by:

\(\displaystyle y=\frac{gt^2}{2}\)

Where \(g=9.8\ m/s^2\), and t is the time.

Solving for t:

\(\displaystyle t=\sqrt{\frac{2y}{g}}\)

Using the value y=200:

\(\displaystyle t=\sqrt{\frac{2*200}{9.8}}\)

t=6.39 sec

The penny will hit the ground at 6.39 seconds

When materials vibrate, waves are created that travel through the substance, and this energy is what we hear as sound. Earthquakes are earth vibrations that cause the (potential) energy held within rocks to be released (as a result of their pressure-generating relative positions). Seismic waves are produced by earthquakes.

How do sound waves and earthquakes compare?

The waves lose energy as they move through the air with sound or through the ground with shaking during an earthquake. Therefore, a band can be heard louder close to the stage than farther away, and an earthquake can be felt more strongly close to the fault than farther away.

In actuality, sound in the air cannot match how quickly earthquake waves move. In rock, the compressional or "P" wave of an earthquake moves at the In actuality, sound in the air cannot match how quickly earthquake waves move. The speed of a P wave is typically 10,000 mph. The speed of sound through air is roughly 750 mph.

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Answer:

m= 3.88 g

Explanation:

p=m/v

p is density

so know we want mass, isolate for m

m=pxv

m= 0.97 g/cm x  4.00 cm^3

m= 3.88 g

The mass of 4.00 cm³ of sodium with a density of 0.97 g/cm³ is 3.88 grams. The mass is calculated in grams.

When you have 4.00 cm³ of sodium with a density of 0.97 g/cm³, the resulting mass is found to be 3.88 grams through the mass-volume relationship. This calculation helps determine the substance's weight based on its given properties.

Given:

Volume = 4.00 cm³

Density = 0.97 g/cm³

The mass is given by:

Mass = Volume × Density

Mass = 4.00 × 0.97

Mass = 3.88 g

Therefore, The mass of 4.00 cm³ of sodium with a density of 0.97 g/cm³ is 3.88 grams.

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