Which of these requirements must be met by two physical quantities when they are added together?

They must have different units when expressed in base units.

They must both have units of kilograms, meters, or seconds.

They must have the same units when expressed in base units.

They must have been given to you in the same units, such inches or centimeters.

Answer:

B: Carbon (C)

Explanation:

Carbon is the only nonmetal there and covalent bonds happen between two nonmetal atoms.

Answer:

0.72 kg per cubic m

Explanation:

Mass = 14.4 kg

Volume = lbh = 4*1*5 = 20 cubic m

\( \because \: density \\ \\ = \frac{mass}{volume} \\ \\ = \frac{14.4}{20} \\ \\ = 0.72 \: kg {m}^{ - 3} \)

Answer:

The balloon will continue to expand and eventually burst.

Explanation:

Simply, the reason for this is because the density of the atmosphere decreases gradually as you increase in altitude closer to space. This means that the air on the outside of the balloon can't provide enough pressure over the surface of the balloon in order to counteract the gas on the inside of the balloon from expanding.

If Aldebaran were to explode tonight then we will be able to see this explosion on the Earth in approximately 65 years. A light-year is a distance that light travels in one (1) year.

A light-year can be defined as a unit equal to the distance that light needs to travels in one (1) year on the Earth.

One light-year can be considered as a unit that equates to approx. 9.7 trillion kilometers (km) or 5.9 trillion miles.

In consequence, a light-year is a distance unit instead of a unit of time, and this unit was developed by Otto Ule.

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Answer:

The object accelerates downward at 4 m/s² since the tension on the rope is less than weight of the object.

Explanation:

Given;

mass of the object, m = 2 kg

weigh of the object, W = 20 N

tension on the rope, T = 12 N

The acceleration of the object is calculated by applying Newton's second law of motion as follows;

T = F + W

T = ma + W

ma = T - W

\(a = \frac{T-W}{m} \\\\a = \frac{12 - 20}{2} \\\\a = -4 \ m/s^2\) (the negative sign indicates deceleration of the object)

The object accelerates downward at 4 m/s² since the tension on the rope is less than weight of the object.

The kinetic energy increase is equal to the potential energy decrease.

If the pendulum is now in the mean position, it will have maximum kinetic energy and zero potential energy. At this stage, the potential energy has been completely transformed to kinetic energy.

At the maximum displacement, the kinetic energy is completely converted into the pendulum's potential energy.

Thus, as the potential energy of the pendulum increases, so does the kinetic energy, and as the kinetic energy increases, so does the potential energy.

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Frictional force provided by the teeth of the boots which are in contact with the grass in the soccer pitch enables the soccer player to start running and prevents him from slipping and falling.

Friction is the opposition to the relative motion of one object over another at their surface of contact.

Friction is a type of contact force as it requires between the two objects for its effect to be felt.

Friction has both advantages and disadvantages.

On of the advantages of friction is in the ability to walk or run. Friction between the ground and the foot or the boots of a person walking or running enables the person from slipping.

For example, when a soccer player runs with soccer boots, friction enables the runner to start running and prevents him from slipping and falling. The friction is provided by the teeth of the boots which are in contact with the grass in the soccer pitch.

In conclusion, friction enables a soccer player to start running and also prevents him from falling.

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Answer: respiration by animals and plants and burning of fuel.

Explanation: would be happy if u give me branliest pls do it

Answer:

Please mark as Brainliest!!

Explanation:

He will not succeed as it blows the trumpet harder that only increase the amplitude of the sound wave that means the intensity of the sound will increase but the frequency remains the same.

Answer:

he wont

Explanation:

Answer:

Q= -6900 J

Explanation:

use the formula Q=mC(T_2 - T_1) and sub in givens

Q=mC(T_2 - T_1)

Q= (200 g)(0.444 J/g°C)(22-100)

Q= -6900 J

The negative sign means heat is lost, which agrees with the decrease in temperature

Answer:

The percent uncertainty of the volume=\(\frac{15.70}{523.59} \times 100=2.99\%\)

The volume of sphere with absolute uncertainty=\(523.59 \pm 15.7 cm^3\)

Explanation:

Radius of sphere = 5 cm

Radius with uncertainty r'= \(5 \pm 0.05\)

Volume of sphere = \(\frac{4}{3} \pi r^3=\frac{4}{3} \pi (r')^3\)

\(V=\frac{4}{3} \pi (r')^3\\\frac{dV}{dr'}=4\pi (r')^2\)

Where dV is the uncertainty in volume

dr' is the uncertainty in radius

\(dV=4\pi (r')^2 dr'\\dV=4 \pi (5)^2(0.05)\\dV=15.70\\V=\frac{4}{3} \pi (r')^3=\frac{4}{3} \pi (5)^3=523.59\)

The percent uncertainty of the volume=\(\frac{15.70}{523.59} \times 100=2.99\%\)

The volume of sphere with absolute uncertainty=\(523.59 \pm 15.7 cm^3\)

Answer:

C. is correct.

Explanation:

Hope this helps :)

The suggestion given by Hannah is not a well-supported and widely accepted explanation. So, option A is correct.

Friction is a force that prevents two solid objects from rolling or sliding over one another. Although frictional forces, such as the traction required to walk without slipping, may be advantageous, they can provide a significant amount of resistance to motion. Automobile engines use about 20% of their output to overcome frictional forces in moving parts.

The adhesion forces between the contact zones of the surfaces, which are always microscopically uneven, appear to be the primary cause of friction between metals. Shearing these "welded" joints and the action of the tougher surface's imperfections scrubbing against the softer surface cause friction.

According to the question, Hannah is driving the car up a hill and when she is not pressing the accelerator the car slows down. The reason behind this is that there is an ascent of height that the car has to climb with its engine power and if the accelerator is not applied to it then it will start to slow down also friction is a factor that is involved in this case.

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Answer:

Bbbbbbbbbbbbbb. bbbbbbbbbbbbbbb

The properties of water that makes it possible for life to continue to exist in lakes covered by a thick layer of ice for many months of the year are:

The correct option is C.

The water in frozen lakes supports life because of the following properties f water;

As soon as the water turns to ice, the ice loses a lot of its water-like density and continues to float on the lake's surface. Water loses density when it grows colder below 4° Celsius, forcing water that is about to freeze to float to the top.

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Answer:

A

Explanation:

Use the conservation of energy formula to calculate the velocity of the ball when it reaches the halfway point (10m down). Then, use your calculated value to obtain the kinetic energy.

Answer:

A. 49 on Plato

Explanation:

Its the right one trust me .

The relative humidity at the surface  is 63.55%. Relative Humidity (RH) refers to the measure of the degree of water vapor present in the atmosphere as compared to the maximum amount of water vapor required for saturation at that temperature.

In order to determine the relative humidity at the surface of the given problem, we will first need to determine the saturation vapor pressure at

-16.9°C.1.

Using the Tetens formula, we get;

es = \(6.11 × 10 ^ ((7.5T)/(T + 237.3))\)

Here,

T = -\(16.9°Ces = 6.11 × 10 ^ ((7.5(-16.9))/( -16.9 + 237.3))= 1.07 kPa2\).

Using the Clausius-Clapeyron relation, we get;

e = \(es × e^[-L/R (1/T - 1/T0)]\)

Here, L is the latent heat of vaporization of

water = \(2.45 × 10 ^ 6 J/kg\)

R is the specific gas constant for water

vapor = 461.5 J/kg K.1/T

is the Kelvin temperature at which es occurs,

i.e. (-16.9 + 273) = 256 K.1/T0

is the Kelvin temperature of the surface dew point temperature,

i.e. \((12 + 273) = 285 K.e = 1.07 kPa × e^[-(2.45 × 10 ^ 6 / 461.5)(1/256 - 1/285)]= 0.68 kPa3.\)

The relative humidity at the surface is given by;

RH = (e/es) × 100RH = (0.68/1.07) × 100= 63.55%

Therefore, the relative humidity at the surface of the given problem is 63.55%.

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The statement given "Galileo's early telescopes revealed the four large moons of Jupiter, the rings of Saturn, and its large moon Titan." is true because Galileo's early telescopes revealed the four large moons of Jupiter, the rings of Saturn, and its large moon Titan.

Galileo Galilei, an Italian astronomer, made significant observations using his early telescopes. His observations provided evidence to support the heliocentric model of the solar system proposed by Copernicus. With his telescope, Galileo discovered four large moons orbiting Jupiter, which are now known as the Galilean moons: Io, Europa, Ganymede, and Callisto. He also observed and documented the presence of rings around Saturn and identified its largest moon, Titan. These observations revolutionized our understanding of the solar system and provided critical evidence for the heliocentric model.

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Answer:

2kg×250=1122kg

Explanation:

You put thease 2 together and you will have this answer:1122kg

Did I help?

If yes give me a crown

The car can take the curve at a speed of 35.89 m/s without skidding to the outside of the curve.

To calculate the maximum speed at which the car can take the curve, we need to first determine the maximum force of static friction that can act on the car. This can be calculated using the formula:

F_friction = friction coefficient * normal force

The normal force is equal to the weight of the car and can be calculated using the formula:

N = m * g (where m is the mass of the car and g is the acceleration of gravity)

So:

N = 1151 kg * 9.8 m/s^2 = 11,288.8 N

F_friction = 0.37 * 11,288.8 N = 4,162.96 N

Next, we need to determine the centripetal force required to keep the car moving in a circle of radius 26m. This can be calculated using the formula:

F_centripetal = m * a

Where a is the centripetal acceleration and can be calculated using the formula:

a = v^2 / r

So we have to find v:

v = sqrt(F_friction*r /m)

v = sqrt(4,162.96 N * 26 m / 1151 kg) = 35.89 m/s

So, the car can take the curve at a speed of 35.89 m/s without skidding to the outside of the curve.

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When θ = 0°, the normal stress on the element remains the same as the initial stress, while the shearing stress is zero. This is because the stress vector is perfectly aligned with the plane's normal, leading to no stress component acting parallel to the plane.

About normal and shearing stresses on an element when θ = 0°.

Normal stress refers to the stress that acts perpendicular to the plane of an element, while shearing stress acts parallel to the plane. When θ = 0°, the angle between the stress vector and the plane's normal is also zero. In this case, the stress acting on the element will be completely normal stress, and there will be no shearing stress.

To determine the normal stress (σ) and shearing stress (τ) at any angle, we typically use stress transformation equations, which are derived from the equations of equilibrium and Mohr's Circle. However, when θ = 0°, the transformation equations simplify, as the sine and cosine of 0° are 1 and 0, respectively. Consequently, at θ = 0°, the normal stress (σ) remains unchanged, and the shearing stress (τ) becomes zero.

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The restoring force F of a spring is proportional to its displacement x from its equilibrium position. This law is called Hooke's law, and it can be written mathematically as follows:

F = − kx

where k is the spring constant

The period of motion can be determined by the following formula:

T=2π\(\sqrt{\frac{m}{k} }\)

where, m = the mask = spring constant

Let the amplitude of motion be A. The total energy of a mass attached to a spring is given by:

E=\(\frac{1}{2}\)k\(A^2\)

The maximum kinetic energy of the mass is given by

K = \(\frac{1}{2}\)m\(v^2\)

The maximum potential energy is given by

U = \(\frac{1}{2}\)k\((A + x_0)^2\)

where \(x_0\) is the displacement of the mass from the equilibrium position when it is released from a point 8 inches above the equilibrium position with an upward velocity of 5 ft/s. The maximum potential energy is equal to the maximum kinetic energy.

Equating the two, we have:

\(\frac{1}{2}\)m\(v^2\) = \(\frac{1}{2}\)k\((A + x_0)^2\) ⇒ A + \(x_0\) = \(\sqrt{\frac{mv^2}{k} }\)

Using this value of A + \(x_0\), we can determine the amplitude of motion as follows:

A = \(\sqrt{\frac{mv^2}{k} }\) − \(x_0\)

The mass in pounds can be converted to slugs as follows: \(m = \frac{54}{32.2} = 1.68\) slugs.

The displacement x of the spring from its equilibrium position can be determined as follows: \(x = \frac{3.84}{12} = 0.32\) ft.

The spring constant k can be determined using the formula:

\(k=\frac{k}{x}\)

where F is the force exerted on the spring when it is stretched by the mass.

The force F can be determined using the formula: F = m * g where g is the acceleration due to gravity.

Substituting the values, we get: F = 1.68 * 32.2 = 54.1 lbf

Substituting these values into the formula for k, we get \(k =\frac{54.1}{0.32} = 169.0\) lbf/ft.

The period of motion can be determined using the formula: T = 2π\(\sqrt{\frac{m}{k} }\).

Substituting the values, we get: T = 2π\(\sqrt \frac{1.68}{169.0}\) = 0.504 s.

Using the value of \(x_0\), we can determine the amplitude of motion as follows: A = \(\sqrt{\frac{mv^2}{k} }\)  − \(x_0\).

Substituting the values, we get: A = \(\sqrt{ \frac{1.68*\frac{25}{9} }{169.0}} - 0.67A\)= 0.062 ft or 0.74 .

When a mass is hung on a spring, it extends from its original length to a new length. This change in length is known as the displacement. The point where the mass hangs without moving up or down is known as the equilibrium position. The restoring force, which is proportional to the displacement from the equilibrium position, acts on the mass when it is displaced from its equilibrium position. This law is known as Hooke's law. The constant of proportionality is known as the spring constant. The period of motion of the mass attached to the spring can be determined using the formula T = 2π\(\sqrt{\frac{m}{k} }\), where m is the mass and k is the spring constant. The amplitude of motion is the maximum displacement of the mass from its equilibrium position.

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Answer:

KE =1/2mv^2

Explanation:

KE depends upon movement of the body

Answer: negative

Explanation:

those are electrons. electrons = - charge

The red dots have a negative charge are known as electron.

Charged material experiences a force when it is exposed to an electromagnetic field due to the physical characteristic of electric charge. You might have a positive or negative electric charge. Unlike charges attract one another while like charges repel one another.

A positively charged nucleus and one or more negatively charged particles known as electrons make up an atom.

There is no overall charge in any atom (neutral). This is due to the fact that they have an equal amount of positive and negative electrons. The atom becomes neutral as a result of the cancellation of these opposing charges.

The red dots have a negative charge are known as electron.

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Answer: Varies

Explanation:

Because moving his legs require force.

Answer:

He is also a low-level telekinetic

Explanation:

He is a telepath and doesn’t have telekinesis btw.

Answer:

6

Explanation:

The dura mater forms the tough and fibrous outer sac of the meninges. The meninges are the protective layers that surround the brain and spinal cord. The three layers of the meninges are the dura mater, arachnoid mater, and pia mater.

The dura mater is the thickest and outermost layer of the meninges. It is a fibrous membrane that is attached to the skull and the vertebrae of the spine. The dura mater forms a tough, outer sac that surrounds and protects the brain and spinal cord.

The dura mater is composed of two parts: the outer dura mater and the inner dura mater. The outer dura mater is made up of dense connective tissue that is rich in collagen fibers. It is attached to the skull and the vertebrae of the spine, forming a tough, protective barrier around the brain and spinal cord. The inner dura mater is a thinner layer of connective tissue that is rich in blood vessels and lymphatic vessels. It is also known as the arachnoid mater. The inner dura mater is attached to the outer dura mater, forming a space called the subarachnoid space, which contains cerebrospinal fluid (CSF).

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Astronomers now know that surrounding the main body of our galaxy (which our various kinds of telescopes have shown to us) and our fainter halo of stars there is: a spherical halo of dust and gas.

There are many stars, grains of dust, and gas in the Milky Way. It is known as a spiral galaxy because, from the top or bottom, it would appear to be whirling like a pinwheel. About 25,000 light-years from the galaxy's nucleus, the Sun is situated on one of the spiral arms. The Milky Way's center would take you about 25,000 years to reach, even if you could move at the speed of light (300,000 km/s, or 186,000 mph).

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X-rays have more energy than visible light and can pass through the human body.

X-rays are a type of electromagnetic radiation that has a shorter wavelength and higher frequency than visible light. Due to their high energy, X-rays can penetrate solid objects, including the human body. This property makes X-rays useful in medical imaging, such as X-ray radiography, computed tomography (CT) scans, and mammography.

When X-rays pass through the human body, they can be absorbed by the tissues or pass through, depending on the density of the material. Bones, for example, absorb more X-rays than soft tissues like muscle or fat, which is why they appear white in X-ray images.

While X-rays can be helpful in diagnosing medical conditions, they can also be harmful if exposure is not limited or controlled. Prolonged exposure to X-rays can damage DNA and potentially lead to cancer or other health problems.

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The relationship between the size of the particles and the velocity of the particles is that smaller particles move faster than larger particles. In other words, as the size of the particle decreases, the velocity of the particle increases. Therefore, the kinetic energy of each particle is directly proportional to the velocity of the particle.

The kinetic energy of each particle is the energy that it possesses due to its motion. When the size of the particle is small, its velocity is high, and thus, it has a higher kinetic energy compared to a larger particle. Therefore, smaller particles have more kinetic energy than larger particles. The relationship between particle size and velocity can be explained by the following equation:

KE = 1/2 mv²

Where, KE is the kinetic energy of the particle, m is the mass of the particle, and v is the velocity of the particle. From the equation, it can be seen that the kinetic energy of a particle is directly proportional to the square of its velocity. This means that if the velocity of a particle is doubled, its kinetic energy will increase by a factor of four. Hence, as the size of the particle decreases, its velocity increases, leading to a higher kinetic energy. This conclusion is in line with the basic laws of physics.

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In words, the R2 of 0.27 means that 27% of the variability in y (24-hour urinary Na) can be explained by x (estimated 24-hour urinary Na) obtained from casual urine specimens at one point in time.

The INTERSALT Study was designed to investigate the relationship between dietary sodium and blood pressure (hypertension) in populations worldwide.

The study included 10,079 men and women from 52 population samples in 32 countries. One of the goals of the study was to quantify the relationship between 24-hour urinary Na (y) and estimated 24-hour urinary Na (x) obtained from casual urine specimens at one point in time.

The investigators presented a simple linear regression of y on x, separately for men and women. The regression equation for men was: Y = 1.03x + 7.19, with R2 = 0.27, n = 1369.

The coefficient of determination, R2, is a statistical measure that represents the proportion of the variance for a dependent variable (y) that's explained by an independent variable (x) or variables in a regression model.

In this case, the R2 of 0.27 means that 27% of the variability in y (24-hour urinary Na) can be explained by x (estimated 24-hour urinary Na) obtained from casual urine specimens at one point in time. The remaining 73% of the variability in y is due to other factors that are not included in the regression model.

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