1.
What is MOST likely to release special chemicals in your brain that actually improve your mood?

good posture

regular activity

anxiety

idle time

Answer:

B. protons and neutrons exist inside the atomic nuclei electrons orbit atomic nuclei.

Explanation:

protons are positively charged while neutrons are negatively charged, and electrons orbit the outside like a loner while protons and neutrons get ki-ssy faced inside the nuclei and electrons do have a charge.

Answer:

10 m

Yes, the car will be able to stop before it reaches the truck.

Explanation:

\(u=\text{Initial velocity of the car}=\dfrac{72}{3.6}=20\ \text{m/s}\)

\(t=\text{Time}=0.5\ \text{s}\)

\(s=\text{Displacement}\)

From the laws of motion we have

\(s=ut+\dfrac{1}{2}at^2\\\Rightarrow s=20\times 0.5+0\\\Rightarrow s=10\ \text{m}\)

The car will travel 10 m in 0.5 seconds

\(a=\text{Acceleration}=-2.5\ \text{m/s}^2\)

\(v^2-u^2=2as\\\Rightarrow s=\dfrac{v^2-u^2}{2a}\\\Rightarrow s=\dfrac{0^2-20^2}{2\times -2.5}\\\Rightarrow s=80\ \text{m}\)

Total distance required for the car to stop is 10+80 = 90 m. So, the car will be able to stop before it reaches the truck.

The value of x is 25 cm³.

Total mass = m1 + m2

m₁ = 0.8 × x =0.8x g

m₂ = 1 × 100 = 100g

Total = (0.8x + 1000)g

Total volume = (x +100)/(x+100) = 0.96

x  =   4/0.16

   = 25 cm³    

Hence, The value of x is 25 cm³.

Mass is the amount of depend in a physical body. it's also a measure of the body's inertia, the resistance to acceleration while a internet force is applied. An object's mass additionally determines the energy of its gravitational appeal to other bodies.

Mass can be exceptional understood as the quantity of count number present in any object or frame. The entirety we see round us has mass. as an instance, a desk, a chair, your bed, a football, a pitcher, and even air has mass. That being said, all gadgets are mild or heavy because of their mass.

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Answer:

ABSOLUTE MAGNITUDE, C

Explanation:

Absolute magnitude is how bright the star is from a distance of 10 parsecs. Apparent magnitude is how bright the star appears from Earth, which can vary, because some stars may be farther or closer away. Age and size are not very accurate either. For example, at the end of their lifetimes, very big start may explode in a violent and bright supernova, and outshine the stars near them. As for size, as many stars several times smaller than the sun shine much brighter than it, making it inaccurate.

The mass of an object should never be determined when the object's temperature is above room temperature because the object's expansion due to heat will cause inaccuracies in the measurement.

When an object is heated, its molecules move faster and take up more space, causing the object to expand. This expansion can lead to an increase in the object's apparent mass, making it difficult to accurately determine its true mass. Therefore, it is important to ensure that the object has cooled down to room temperature before attempting to measure its mass.

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We must remember that all molecules have zero net charge. To solve this question lets take a look at the periodic table.

We can see that Chlorine belongs to the column 17. That means its charge is negative one, i.e., -1. We can write:

We also can see that Tin is in 14th column but that doesn't tell us much about it electric charge.

To solve this we must use the "fence trick".

Since the molecule has zero net charge, that means the sum of all charges must be zero. Using the "fence trick" we have to cross the numbers that appear on the molecule. We can write:

So the charge of the transition metal is:

Out of the given options, only "Blown car tire" would be considered an emergency fund expense.

An emergency fund expense is an unforeseen and urgent cost that requires immediate attention and cannot be easily covered by one's regular income or savings.

Examples of emergency fund expenses may include unexpected car repairs, medical bills, or sudden job loss. The purpose of an emergency fund is to provide a financial cushion that can help cover these types of expenses, allowing individuals to manage unexpected financial shocks without having to resort to high-interest debt or deplete their long-term savings.

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Answer:

3.37

Explanation:

Answer:

8.21 m/s

Explanation:

First we have to determine the time it took for the cat to hit the floor

We will have to assume that the cat's motion was entirely in the horizontal direction when it slid off the table. This is not an unreasonable assumption

Therefore when the cat slid off the table, its vertical velocity was 0

We will use the formula
\(h = ut + \dfrac{1}{2}at^2\)
to find the time taken for the cat to hit the floor from a height of 0.57 m

where

h = height of the table = 0.57m

u = initial vertical velocity = 0

a = acceleration = gravitational acceleration = g = 9.8 m/s²

Plugging in values we get

\(0.57 = 0\cdot t + \dfrac{1}{2}\cdot 9.8\cdot t^2\)

⇒ \(\rightarrow 0.57 = 4.9t^2\\\\\rightarrow t^2 = \dfrac{0.57}{4.9}\\\\\rightarrow t = \sqrt{0.1163265}\\\\\rightarrow t \approx 0.341067 \textrm{ s}\\\\\\\)

The horizontal distance traveled by the cat is 2.8m. The time it takes to travel this distance must be the same as the time it took the cat to hit the floor. There is no acceleration in the horizontal direction

So the velocity in the horizontal direction

= \(\rm \dfrac{distance}{time}$\)

\(= \dfrac{2.8}{0.341067}\)

≈  8.209537 m/s ≈ 8.21 m/s

The composition of a star is determined from the red or blue shift of spectral lines in a spectrum, the width of the spectral lines in the spectrum.

The study of light and other radiation absorption and emission by matter is called spectroscopy. Electromagnetic radiation into its constituent wavelengths, in a spectrum, just like a prism splits light into a rainbow of colors.

The composition of a star is determined from the red or blue shift of spectral lines in a spectrum, the width of the spectral lines in the spectrum.

Hence, option D is correct.

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Given that the progressive wave equation is represented by y=Asin2π(0.15t-0.1x). Let's find the period, amplitude, frequency, wavelength, and velocity.

The wave equation is represented by y=Asin2π(0.15t-0.1x). The standard wave equation can be written asy = Asin(kx-ωt + Φ)Where,k = wave numberω = angular frequencyΦ = phase angle for the given equation, k = 0.1 and ω = 0.15.Amplitude:

Amplitude = A = maximum displacement from the mean position.A = 1Frequency: Frequency is the number of complete oscillations made by a point on the wave in one second. It is denoted by f.f = ω/2πFrequency, f = 0.15/2π = 0.0238 HzPeriod: Period is the time taken by one complete oscillation.

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Answer:

Cold temps. . .

Explanation:

Hope it helps!

Answer:

1. Stars, Nebula, Exo Planets, Star Clusters
2. Galaxies, Magelnic Clouds, Voids

Explanation:

Studying Astronomy for Years hope this helps and if you need more than this basic run down let me know have a great night!

Answer:

Momentum is equal to mass for velocity (p1=mv)

But momentum is also equal to Force for time of impact (p1=Ft). Hence the impact force is inversely proportional to the fall time and directly proportional to the mass and fall velocity : F=mv/t^2 or F=p1/t

If he slows down, v diminishes and F diminishes

Hence correct Answer is C

Answer:

Suppose at time t1 = zero and v1 = 50 MPH

                    time t2 = 10 sec and v2 = 10 MPH

Change in speed   =  (v2 - v1) / (t2 - t1) = (10 - 50) MPH / (10 - 0) sec

Change in speed = -40 MPH / 10 sec = - 4 MPH / sec

If you specify the velocity as always East then

change in velocity = - 4 MPH East

Had the particle finished by moving in the Westerly direction  then

Change in velocity = (-10 - 50) MPH / 10 sec = -60 / 10 MPH = -60 MPH East

Where West was the positive direction

Initially v1 was 50 East and v2 was -10 East with a difference of 60 MPH

Answer:

a) Shadow distance

10 cm in front of the mirror.

b) Zoom in the shadow

The shadow formed is the same height as the object and is placed also at the centre of curvature of the mirror as shown in the attached image to this solution.

c) The nature of the shadow

The shadow formed is real, inverted, same size as the object and formed at the centre of curvature.

Explanation:

English Translation

Objects as high as 3 cm are placed at a distance of 10 cm in front of a concave mirror with 10 cm curvature. Determine:

a) Shadow distance

b) Zoom in the shadow

c) The nature of the shadow

Solution

The mirror equation is given as

(1/f) = (1/v) + (1/u)

f = focal length of the mirror = (radius of curvature)/2 = 10/2 = 5 cm

v = image distance = ?

u = object distance = 10 cm

We can then calculate the shadow' s distance from the mirror thus

(1/5) = (1/v) + (1/10)

(1/v) = 0.2 - 0.1 = 0.1

v = (1/0.1) = 10 cm

b) Zoom in the shadow

Since the object is placed at the centre of curvature, as shown in the attached image, the image is formed at a point of intersection of rays. The image formed is the same height as the object and is placed also at the centre of curvature of the mirror.

c) The nature of the shadow

Since the mirror is a concave mirror, the image is real and formed in front of the mirror. The image is also inverted and formed at the centre of curvature of the mirror.

Hope this Helps!!!

Answer: A. acceleration

Explanation: Acceleration is the term that is equal to velocity change per second. Acceleration refers to the rate at which an object's velocity changes over time. It measures how quickly an object's speed or direction changes. When an object speeds up, slows down, or changes direction, its velocity is changing, and this change per unit of time is known as acceleration.

To calculate acceleration, you divide the change in velocity by the time it takes for that change to occur. The unit of acceleration is meters per second squared (m/s²) in the metric system. For example, if an object's velocity changes from 10 m/s to 20 m/s in 2 seconds, the acceleration would be (20 m/s - 10 m/s) / 2 s = 5 m/s².

The impulse imparted by the wall is -2 kg·m/s. The negative sign indicates a change in direction due to the rebound of the ball.

To determine the impulse imparted by the wall, we can use the principle of conservation of momentum. The impulse is equal to the change in momentum experienced by the ball.

The momentum of an object is given by the product of its mass and velocity:

Momentum = mass × velocity

Given:

Mass of the ball (m) = 0.10 kg

Initial velocity of the ball (v₁) = 10 m/s

Final velocity of the ball (v₂) = -10 m/s (negative sign indicates a change in direction)

The initial momentum of the ball is:

Initial momentum = m × v₁ = 0.10 kg × 10 m/s = 1 kg·m/s

The final momentum of the ball is:

Final momentum = m × v₂ = 0.10 kg × (-10 m/s) = -1 kg·m/s

The change in momentum is the difference between the final and initial momentum:

Change in momentum = Final momentum - Initial momentum = (-1 kg·m/s) - (1 kg·m/s) = -2 kg·m/s

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Answer: 7.75pc

Explanation:

Given data:

p = 0.129arcseconds.

Solution:

D = 1/p

D = 1/0.129

D = 7.75pc

The Vega is 7.75parsecs from Pluto.

Answer:

5.59 m/s2

Explanation:

F = 1900 N

m = 340 kg

F = ma

Therefore, a = 1900/340 = 5.59

Answer:

collision between truck

Explanation:

Answer. Collision between trucks, because more is the mass, more is the inertia and therefore more is the momentum. Mass of the trucks is more than that of cars so collision of trucks will cause more damage.

Answer:

When an object vibrates, it causes movement in surrounding air molecules. These molecules bump into the molecules close to them, causing them to vibrate as well. This makes them bump into more nearby air molecules. This “chain reaction” movement, called sound waves, keeps going until the molecules run out of energy.

Explanation:

Explanation:

the answer is in the above image

Given:

mass of first ball, m1 = 35g

mass of second ball, m2 = 75g

velocity of first ball before collision, u1 = 9m/s

velocity of second ball before collision, u2 = -7m/s

velocity of first ball after collision, v1 = -15m/s

velocity of second ball after collision, v2 = ? (To Find)

Now it is given that there is no net force on the system of two balls

according to the Law of Conservation of Momentum so, here momentum is constant before and after collision:

P1 = P2

m1u1 + m2u2 = m1v1 + m2v2

35g*9m/s + 75g*(-7m/s) = 35g*(-15m/s) + 75g*v2

v2 = (35g*9m/s + 75g*(-7m/s) - 35g*(-15m/s))/75g

v2 = 4.2m/s

therefore, the velocity of second ball after collision is 4.2m/s

As a result, the equation of the law of conservation of momentum is as follows: m1 u1 + m2 u2 represents the total momentum of particles A and B before the collision, and m1 v1 + m2 v2 represents the total momentum of particles A and B after the collision.

Momentum. If the mass of an object is m and it has a velocity v, then the momentum of the object is defined to be its mass multiplied by its velocity. momentum = mv. Momentum has both magnitude and direction and thus is a vector quantity. The units of momentum are kg m s−1 or newton seconds, N s.

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Answer:

F = 30 N

Explanation:

The correct matches of the terms are Absolute zero represents the absence of thermal energy, heat is the transfer of energy, temperature measures the intensity of heat, and latent heat is involved in phase changes.

1. Absolute zero is the temperature at which a substance has no kinetic energy per particle to give up. Absolute zero is the lowest possible temperature, at which all molecular motion ceases.

2. Heat is the energy transferred from one object to another due to a temperature difference. Heat is the transfer of thermal energy from a hotter object to a colder object.

3. Temperature is the degree of hotness or coldness of a body or environment. Temperature measures the average kinetic energy of the particles in a substance, indicating how hot or cold it is.

4. Latent heat is the energy released or absorbed by a substance during a change of state. Latent heat is the heat energy absorbed or released when a substance undergoes a change of state, such as melting, vaporization, or condensation, while the temperature remains constant.

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Answer:

velocity shsjshsuud7dudhdudbe

The radiative energy produced by the accretion disk is 5.45 x 1017 J.

Radiative energy is a form of energy that is produced by electromagnetic radiation and is the energy transferred through space in the form of electromagnetic waves. It is the energy that is released from the Sun in the form of light and heat, and is also found in the form of microwaves, x-rays, and gamma rays. Radiative energy is a form of energy transfer that does not require the presence of any material medium, and can travel through a vacuum.

The radiative energy produced by the accretion disk is equal to 10% of your mass-energy, which can be calculated using the equation E=mc². Your mass, m, is equal to 54.5 kg. Substituting these values into the equation gives the radiative energy produced by the accretion disk:
E = (54.5 kg)(3 x 108 m/s)²
E = 5.45 x 1017 J
Therefore, the radiative energy produced by the accretion disk is 5.45 x 1017 J.

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Answer:

152,155 J

Explanation:

115,333 + 36,822 = 152,155J

3.The ranking of quantities in decreasing order of distance is as follows: 1 Mm (Megameter) > 1 km (Kilometer) > 100 m (Meter) > 1 cm (Centimeter) > 50 mm (Millimeter) > 1 mm (Millimeter) > 5 million nm (Nanometer).

8. A) When the size of a milk chocolate bar is reduced to 5.000 g, the amount of sugar in milligrams is approximately 73.15 mg.

b) The percentage of sugar in a 14.630 g milk chocolate bar is approximately 63.60%.

10 A) 4.1 ounces of a steroid ointment is approximately 120 grams.

D) Each blueberry high-fiber muffin contains approximately 24 grams of dietary fiber.

1. Ranking the quantities in decreasing order of distance:

1 Mm (Megameter) --> 1 km (Kilometer) --> 100 m (Meter) --> 50 mm (Millimeter) --> 1 cm (Centimeter) --> 1 mm (Millimeter) --> 5 million nm (Nanometer)

2. a). To find the amount of sugar in milligrams when the size of the milk chocolate bar is reduced to 5.000 g, we can use the proportion:

14.630 g / x = 5.000 g / 1000 mg

Solving for x, we get:

x = (5.000 g * 14.630 g) / 1000 mg ≈ 73.15 mg

So, when the chocolate bar size is reduced, the amount of sugar in milligrams will be approximately 73.15 mg.

b). To calculate the percentage of sugar in a 14.630 g milk chocolate bar, we use the formula:

Percentage = (Amount of sugar / Total weight) * 100

Percentage = (9.315 g / 14.630 g) * 100 ≈ 63.60%

So, the percentage of sugar in a 14.630 g milk chocolate bar is approximately 63.60%.

10. a). To convert 4.1 ounces of a steroid ointment to grams, we use the conversion factor:

1 lb = 16 oz, 1 lb ≈ 453.592 g

4.1 oz * (1 lb / 16 oz) * 453.592 g ≈ 119.0792 g ≈ 120 g (to two significant figures)

So, the pharmacist needs to prepare approximately 120 grams of ointment.

D). If blueberry high-fiber muffins contain 51% dietary fiber and a package weighing 16 oz contains six muffins, we can calculate the amount of fiber in each muffin as follows:

Amount of fiber per muffin = (Weight of one muffin * Percentage of dietary fiber) / 100

Amount of fiber per muffin = (16 oz / 6) * (51 / 100) * 28.3495 g ≈ 24 g (to two significant figures)

Each blueberry high-fiber muffin contains approximately 24 grams of dietary fiber.

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The length of the shadow of the object decreases as the sun position changes from down to top in the sky.

The size of the object does not depend on its size; rather, the shape of the object determines the shape of the shadow cast by it.

As the light source's position changes, so does the object's size. The shadow is cast in the opposite direction from how the body is illuminated by the sun.

The sun is low in the sky as evening approaches. The shadows cast by the object are longer and to the east because the sun's rays fall vertically.

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Answer:

charge, distance

Explanation:

te distance between the particles and the am amount of electric charge the they carried