At 30 mph, it takes approximately ____ to react to something you see and to bring your car to a complete stop.
a. 10 feet
b. 30 feet
c. 100 feet

It is important to understand what the absorption coefficient (a) represents.

This coefficient is a measure of the amount of energy that is absorbed by a material per unit of distance traveled by the radiation through the material. In other words, it represents the ability of a material to absorb electromagnetic radiation. The magnitude of this coefficient can vary depending on a number of different factors, one of which is the wavelength of the radiation.

Lastly, it is important to note that the magnitude of the absorption coefficient is not the only factor that determines how much radiation is absorbed by a material. Other factors such as the thickness of the material, the temperature of the material, and the intensity of the radiation all play a role in determining the amount of energy that is absorbed.

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Answer:

D, E, and F

Explanation:

Like a gas, plasma lacks a fixed volume and shape. Unlike a gas, plasma can conduct electricity and respond to magnetism. That's because plasma contains charged particles called ions. The particles that make up matter are also constantly moving.

The properties of both a gas and a plasma are:

A gas lacks both a fixed volume and a fixed shape. While certain gases are palpable to humans and can be seen and felt, others are not. The gases oxygen, helium, and air are a few examples. N2, O2, and CO2 are among the gases that make up the Earth's atmosphere.

Both the volume and shape of plasma are illusive. Ionized gases frequently contain plasma, yet plasma differs from a gas in that it has special characteristics. The plasma is electrically conductive because it contains free electrical charges that aren't attached to atoms or ions. A gas can be heated and ionized to create plasma. Stars, lightning, fluorescent lights, and neon signs are a few examples of plasma.

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Answer:

Its D

Explanation:

I got help from another user lol

Answer:

D!!!

Explanation:

I had this question on my assignment and got it right!

The fraction of the mass needed to halt expansion is known to exist in the form of visible mass in the universe is 1 percent

Baryons, a general term for subatomic particles including protons, neutrons, and electrons, make up visible matter, also known as baryonic matter. What dark matter is constituted of is a topic of conjecture among scientists.

A mysterious, invisible substance called dark matter (25%) and a force that defies gravity called dark energy appear to make up the rest of the universe.

It is estimated that dark energy is responsible for 73% of the universe's total mass and energy. Dark matter makes up another 23% of the universe, leaving only 4% of it to be made up of ordinary matter like stars, planets, and people.

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None of the options listed is a negative externality. A negative externality is an unintended consequence of an economic activity that affects a third party who is not directly involved in the activity.

If I were to choose: Businesses would not necessarily increase hiring rates.

This could be considered a negative externality because the grant funding is intended to fund job training in order to increase employment opportunities, but if businesses do not increase their hiring rates despite having a pool of trained workers, then the intended benefit of the grant may not be fully realized. This could result in a loss of resources and a missed opportunity to address unemployment in the community.

Answer:

the answer is b

Explanation:

the answer is b.

Answer:

b is the answer........*-*

a. The rotational inertia of the rod is 0.0004 kgm²

b. The rotational inertia of a weight is 0.0009025 kgm²

c. The total rotational inertia is 0.002205 kgm²

Rotational inertia is a property of an object which shows its aboility to rotate about an axis.

The rotational inertia of  a rod is given by I = 1/12ML² where

Given that

So, substituting the values of the variables into the equation, we have that

I = 1/12ML²

= 1/12 × 0.030 g × (0.40 cm)²

=  1/12 × 0.030 kg × 0.1600 m²

=  1/12 × 0.0048 kgm²

= 0.0004 kgm²

So, the rotational inertia of the rod is 0.0004 kgm²

The rotational inertia of the weight (as a hoop) is given by I' = 1/2mL' where

Given that

So, substituting the values of the variables into the equation, we have that

I' = 1/2mL'²

= 1/2 × 0.050 g × (0.19 cm)²

= 0.025 kg × 0.0361 m²

= 0.0009025 kgm²

So, the rotational inertia of a weight is 0.0009025 kgm²

The total rotational inertia, I" = rotational inertia of rod + rotational inertia of both weights.

So, I" = I + 2I'

= 0.0004 kgm² + 2 × 0.0009025 kgm²

= 0.0004 kgm² + 0.001805 kgm²

= 0.002205 kgm²

So, the total rotational inertia is 0.002205 kgm²

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When preparing a wet mount specimen for viewing, it should be covered with a coverslip.

A coverslip is a thin, flat piece of glass or plastic that is placed over the specimen on the slide. It is used to protect the specimen from being compressed or damaged, and to prevent evaporation of the liquid medium that the specimen is suspended in. The coverslip also helps to keep the specimen in focus and allows the viewer to observe the specimen clearly under a microscope.

To prepare a wet mount, a small amount of the specimen is placed on a microscope slide and a drop of liquid medium (such as water, saline, or stain) is added. The coverslip is then placed over the specimen at a slight angle and carefully lowered onto the slide to avoid trapping air bubbles. The coverslip should be pressed down gently to flatten the specimen and remove any excess liquid, but not so hard as to crush the specimen.

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The mass of box D, given that a 20 Kg block and two girls each of 20 Kg and 30 Kg sits on the sea-saw is 10 Kg

The mass of box D can be obtained as illustrated below:

Clockwise moment = Anti-clockwise moment

(0.5 × box D) + (1.5 × 30) = (2 × 20) + (0.5 × 20)

0.5 × box D + 45 = 40 + 10

0.5 × box D + 45 = 50

Collect like terms

0.5 × box D = 50 - 45

0.5 × box D = 5

Divide both sides by 0.5

Box D = 5 / 0.5

Box D = 10 Kg

Thus, we can conclude that the mass of box D is 10 Kg

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The value of x = -6.29 m

The center of gravity of the three particles X = m₁x₁ + m₂x₂ + m₃x₃/(m₁ + m₂ + m₃)

Given that the center of gravity is located at the origin, X = 0 m and m₁ = 5.00 kg, m₂ = 4.00 kg , m₃ = 7.00 kg, x₁ = 4.00 m, x₂ = 6.00 m, and x₃ = x m

Substituting the values of the variables into the equation, we have

X = m₁x₁ + m₂x₂ + m₃x₃/(m₁ + m₂ + m₃)

0 = 5.00 kg × 4.00 m + 4.00 kg × 6.00 m + 7.00 kg × x/(5.00 kg + 4.00 kg + 7.00 kg)

0 = 20.00 kgm + 24.00 kgm + 7.00x kgm/16.00 kg

Cross-multiplying, we have

20.00 kgm + 24.00 kgm + 7.00x kgm = 0

44.00 kgm + 7.00x kgm = 0

44.00 kgm = -7.00x kgm

Divide through by -7.00 kg, we have

x = 44.00 kgm/-7.00 kg

x = -6.29 m

So, the value of x = -6.29 m

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The new period of oscillation if the mass of the bob is reduced by half is \(\frac{T}{\sqrt{2}}\) or T/√2.

Look at the attachment for a complete question. The period of oscillation of the simple pendulum

where

If we change the mass of the bob and didn't change the rope, the period also will change but the rope constant will not. The ratio of the period between the two condition

T² = 4π²m/k

T₁²: T₂² = m₁ : m₂

T²: T₂² = m : 0.50 m

T²: T₂² = 1 : 0.5

T₂² = 0.5T²

\(T_2 \:=\: \sqrt{0.5T}\)

\(T_2 \:=\: \sqrt{\frac{T}{2}}\)

T₂ = T/√2

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Answer:

Explanation:

Given parameters

initial velocity u = 4.9m/s

height of drop H = 100m

acceleration due to gravity g = -9.8m/s²(since the body is ascending i.e moving against gravity)

Required

time taken by the packet to reach the ground 't'

Using the equation of motion

S = ut+1/2gt²

0-100 = 4.9t+1/2(-9.8)t²

-100 = 4.9t-1/2(9.8)t²

-100 = 4.9t-4.9t²

4.9t-4.9t² +100 = 0

4.9t²-4.9t² -100 = 0

Multiplying through by 10

49t²-49t-1000 = 0

Using the general equation t = (-b±√b²-4ac)/2a

t = -(-49)±√(-49)²-4(49)(-1000)/2(49)

t = 49±√(2401+196000)/2(49)

t = 49±√(198401)/98

t = 49±√(198401)/98

t = 49±449.42/98

t = (49+449.42)/98

t = 494.42/98

t = 5.04secs

Hence, it took the packet 5.04secs to reach the ground

The final velocity is calculated using the formula v = u + at

v = u-gt

v = 4.9-(9.8)(5.04)

v = 4.9-49.392

v = -44.492m/s

This shows that the final velocity is 44.49m/s(moving downwards)

Inertia is directly related to the mass of an object.

Inertia is the tendency of an object to resist a change in its motion. The more mass an object has, the more inertia it has, and the harder it is to change its motion. This is why it is harder to push a heavy object than a light one.

The relationship between inertia and mass can be seen in Newton's Second Law of Motion, which states that the acceleration of an object is equal to the force applied to it divided by its mass. This means that the more mass an object has, the less it will accelerate when a force is applied to it. In conclusion, inertia is directly related to the mass of an object. The more mass an object has, the more inertia it has, and the harder it is to change its motion.

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The primary medium through which the sound waves travel is

Air.

A wave is defined as a disturbance that travels through a

medium which transports energy from one place to another in

the process.

In a guitar, the vibration of the string sets the surrounding air

molecules into vibrational motion which thereby produces

sound heard.

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In order to find how many centimeters are in 15 kilometers, we can use the following conversion rate:

1 km = 100,000 cm.

So, for 15 kilometers, we have:

Therefore the correct option is C.

Answer:

60m/s

Explanation:

We are given that

Speed of car after 5 sec, v=40m/s

Acceleration ,a=\(-4m/s^2\)

We have to find the initial speed of car.

We know that

Acceleration, a=\(\frac{v-u}{t}\)

Where v=Final speed

u=Initial speed

Using the formula

\(-4=\frac{40-u}{5}\)

\(-4\times 5=40-u\)

\(-20=40-u\)

\(u=40+20\)

\(u=60\)

Hence, initial speed of car=60m/s

Answer:

hhmmmmmhmmmm hmhmmmm hmmm yeah i got nothing

Explanation:

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.

V = 200.16 volts

Explanation:

V= IR

= (1.39 A)(144 ohm)

= 200.16 volts

Answer:

200.16

Explanation:

acellus

Answer:

The electric field at a point midway between the two charges is 2 x 10⁹ N/C.

Explanation:

Given;

first point charge, Q₁ = 3.0 C

second point charge, Q₂ = 5.0 C

distance between the two point charges, R = 6.0 m

The mid-point between the two charges, r = R/2 = 3.0 m

3.0 C <-------------------->3.0m<----------------------->5.0 C

The forces are acting in opposite direction, the electric field strength of each charge is calculated as;

\(E_1 = \frac{kQ_1}{r^2} (-\bar x)\\\\E_1 = \frac{9\times 10^9 \times 3}{3^2}(-\bar x)\)

\(E_2 = \frac{kQ_1}{r^2} (+\bar x)\\\\E_2 = \frac{9\times 10^9 \times 5}{3^2} (+\bar x)\\\\\)

The net electric field is calculated as;

\(E_{net} = \frac{9\times 10^9 \times 5}{3^2} \ - \ \frac{9\times 10^9 \times 3}{3^2}\\\\E_{net} = \frac{9\times 10^9 }{3^2} (5-3)\\\\E_{net} = 2 \times 10^9 \ N/C\)

Therefore, the electric field at a point midway between the two charges is 2 x 10⁹ N/C.

When Earth is closer to the sun, there will be hotter climate. A little movement that takes one closer to the sun could lead to a huge impact.

If I put a planet in orbits 2, 6, and 75, all planets will orbit the sun successfully if the sun's mass is 1x, and at least one planet will fall inside the habitable zone.

If I put a planet in orbits 84, 1, and 5, at least one of them will fall into the habitable zone if the sun's mass is 2x, and all planets will orbit the sun successfully.

If I put a planet in orbits 672 and 7, at least one of them will fall into the habitable zone if the sun's mass is 3x, and all planets will orbit the sun successfully.

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The velocity of the echidna is 4.8033 m/s to the right.

To find the Momentum:

p = m * v

where

p = Momentum

m = mass

v= velocity

Given that the momentum of the echidna is 29.3 kgm/s to the right and its mass is 6.1 kg, we can rearrange the formula to solve for velocity:

v = p / m

Substituting the given values:

v = 29.3 kgm/s / 6.1 kg

v ≈ 4.8033 m/s

Therefore, the velocity of the echidna is approximately 4.8033 m/s to the right.

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Answer: In the Newton's ring experiment, the diameter of the 4th dark ring is 0.30 cm and the diameter of the 10th dark ring is 0.62 cm. We can use this information to find the diameter of the 15th dark ring and calculate the wavelength of the light.

Explanation:

In the Newton's ring experiment, the diameter of the 4th dark ring is 0.30 cm and the diameter of the 10th dark ring is 0.62 cm. We can use this information to find the diameter of the 15th dark ring and calculate the wavelength of the light.

a) To find the diameter of the 15th dark ring, we can use the formula for the diameter of the nth dark ring:

d_n = sqrt(n * λ * R)

where d_n is the diameter of the nth dark ring, n is the order of the ring, λ is the wavelength of the light, and R is the radius of curvature of the lens.

Since we want to find the diameter of the 15th dark ring, we can substitute n = 15 into the formula and solve for d_15:

d_15 = sqrt(15 * λ * R)

b) To calculate the wavelength of the light, we can use the formula:

λ = (\(d_10^2 - d_4^2\)) / (\(10^2 - 4^2\))

where d_10 is the diameter of the 10th dark ring and d_4 is the diameter of the 4th dark ring.

Substituting the given values, we have:

λ = (\(0.62^2 - 0.30^2\)) / (\(10^2 - 4^2\))

Simplifying this expression will give us the value of the wavelength of the light used in the experiment.

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the first one cuz I know

The correct answer to this question is A) Δt. This is because time intervals are invariant in all inertial reference frames, meaning they are the same no matter how fast an observer is moving.

This is a fundamental principle of special relativity. Therefore, an observer in any other inertial reference frame will measure the same time interval Δt between the astronaut's heartbeats as she does. This is true regardless of whether the observer is moving towards or away from the astronaut, as the relative motion between them does not affect the measurement of time intervals. This concept is crucial in space travel and exploration, as astronauts must account for the invariant nature of time when making calculations and measurements. Overall, the time interval between an astronaut's heartbeats is a reference frame-independent quantity that is consistent across all inertial frames of reference.

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Answer:

Answer:

Debt payments to income ratio = 22.74%

Explanation:

Debts payment to Income ratio is calculated as follows:

= \frac{Total\ debt\ payment}{Total\ Income}

Total Income

Total debt payment

We have total debts payment = auto loan payment 685 + student loan payment685+studentloanpayment375 + credit card payment 125 =125=1,185

Total Income = $5,210

Note: Credit card is also a kind of debt as firstly all the expenses are met during the period and then the payment is made at the end of the period, therefore, there is a loan in the period. Therefore, it will be considered for payment of debt.

Debt payments to income ratio = \frac{1,185}{5,210} = 22.74

5,210

1,185

=22.74

That means the debts are 22.74% of income.

Answer:

Your balloon has been expanding for 5 hours.

Explanation:

Your balloon has been expanding for 5 hours.