I’m not understanding this , any help ?

Light travels is a straight line so the answer is "D)."

All electromagnetic waves travel in a straight line (D) until they hit something that reflects or refracts or absorbs them, or until they hit the boundary at the beginning of a different medium.

That includes light, because light is an electromagnetic wave.

"Mass" is what YOU ARE.  It doesn't matter whether you're on Earth, on the moon, on an asteroid, on a meteoroid, on the sun, swimming in chicken soup on Saturn, or in a space capsule falling from one solar system body to another one.  Your mass DOESN'T change.

Whatever mass the astronaut had after he ate that steak dinner just before he was launched, THAT's the mass he has while he's on the way to another planet, and THAT's the same mass he'll have when he gets there.  It makes no difference what the gravity is like on the other planet.  His mass will not change. (choice-B)

Only his WEIGHT changes when he's in different places.

The correct answer is B.  His mass on that planet would be the same as his earth mass.

The mass of an object is an intrinsic property and does not change with the change in gravity. Mass is a measure of the amount of matter in an object and remains constant regardless of the object's location in the universe. Therefore, the astronaut's mass on the planet with half the Earth's gravity would be the same as his mass on Earth.

 However, it is important to note that while the astronaut's mass remains the same, his weight would change. Weight is the force exerted by gravity on an object's mass, and it is calculated by the equation [tex]\( W = m \cdot g \)[/tex], where W is the weight, m is the mass, and g is the acceleration due to gravity. Since the force of gravity on this hypothetical planet is half that of Earth, the astronaut's weight would be half of what it is on Earth. But again, his mass would remain unchanged.

-- Light is electromagnetic radiation.

-- Electromagnetic radiation has no mass.

-- Electromagnetic radiation can travel through vacuum.

Answer:

Option (1), (3) and (4) are correct.

Explanation:

When the oscillating electri and magnetic field interacts perpendicularly to each other, the electromagnetic radiations are produced. The electromagnetic radiations propagates in the perpendicular direction of both electric and magnetic field vectors.

For example, gamma rays, X rays, ultra violet rays, visible radiations, infrared rays, micro waves and radio waves.

Electromagnetic radiations do not require any medium for their propagation.

They do not carry mass, they carry energy only.

Stationary waves (so called because they seem to be immobile) occur when two waves interfere with the same frequency, amplitude but with different direction, along a line with a phase difference of half wavelength.

In this kind of waves there are two types of points:

The nodes, which are points that remain motionless or stationary and do not vibrate. They are due to the destructive interference of both waves when they meet.

The antinodes, which are points that vibrate with a maximum vibration amplitude. They are due to the non-destructive interference of both waves.

According to this explanation and comparing it with the description, when this two waves pass through each other, the point P will become a node, hence it will remain stationary.

Either Answer Choice A Or D

Answer:

THE ANSWER IS A

Explanation:

The answer is Nonpolluting

The correct answer would be A (Nonpolluting), hope this helps! (:

Answer:

120 kg m/s

Explanation:

The magnitude of the momentum of an object is given by

[tex]p=mv[/tex]

where

m is the mass of the object

v is its speed

For the block in this problem,

m = 10.0 kg (mass of the block)

v = 12.0 m/s (speed of the block)

Therefore the magnitude of the block's momentum is

[tex]p=(10.0 kg)(12.0 m/s)=120 kg m/s[/tex]

The ball's horizontal and vertical velocities at time [tex]t[/tex] are

[tex]v_x=v_{xi}[/tex]

[tex]v_y=v_{yi}-gt[/tex]

but the ball is thrown horizontally, so [tex]v_{yi}=0[/tex]. Its horizontal and vertical positions at time [tex]t[/tex] are

[tex]x=v_{xi}t[/tex]

[tex]y=20.0\,\mathrm m-\dfrac g2t^2[/tex]

The ball travels 22 m horizontally from where it was thrown, so

[tex]22\,\mathrm m=v_{xi}t[/tex]

from which we find the time it takes for the ball to land on the ground is

[tex]t=\dfrac{22\,\rm m}{v_{xi}}[/tex]

When it lands, [tex]y=0[/tex] and

[tex]0=20.0\,\mathrm m-\dfrac{9.8\frac{\rm m}{\mathrm s^2}}2\left(\dfrac{22\,\rm m}{v_{xi}}\right)^2[/tex]

[tex]\implies v_i=v_{xi}=11\dfrac{\rm m}{\rm s}[/tex]

Answer: 11m/s.

Explanation: 11m/s.

I wanna say it’s D. Slower post exercise recovery time.

Slower post exercise recovery time is not a benefit of improved cardio-respiratory fitness. Thus, the correct option is D.

Cardiorespiratory fitness is the ability of the circulatory and respiratory systems to supply sufficient amount of oxygen to skeletal muscles during sustained physical activity. Scientists and researchers use cardiorespiratory fitness to assess the functional capacity of the respiratory and the cardiovascular systems.

The benefits of cardiorespiratory exercise include lower blood pressure, improve blood flow, improve workout efficiency, lower cholesterol levels, decrease risk of heart disease, stroke and diabetes, and other heart-healthy habits.

Therefore, the correct option is D.

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Answer:

[tex]2.1 \mu T[/tex]

Explanation:

The magnetic field strength is given by:

[tex]B=\frac{\mu_0 I}{2 \pi r}[/tex]

where

[tex]\mu_0[/tex] is the vacuum permeability

I is the current

r is the distance from the wire

In this problem,

I = 6.5 A

r = 6.3 cm = 0.063 m

So, the magnetic field strength is

[tex]B=\frac{(1.256\cdot 10^{-7} H/m)(6.5 A)}{2 \pi (0.063 m)}=2.1\cdot 10^{-6} T=2.1 \mu T[/tex]

Answer:

The work done is 2800 Joules

Explanation:

When a force causes a body to move, work is being done on the object

by the force

Work is the measure of energy transfer when a force moves an object

through a distance

→ Work = Force × Distance

→ The SI unit for work is the joule (J)

A refrigerator of 700 N is lifted straight up a distance of 4 meters

We need to find the work done​

→ The weight of the refrigerator is 700 N

→ The force = 700 Newtons

→ The refrigerator is lifted straight up 4 m

→ The distance = 4 meters

Substitute these values in the rule below

→ Work = Force × Distance

→ Work = 700 × 4 = 2800 Joules

The work done is 2800 Joules

This is an example of amplitude modulation which is a method to transmit analog signals via radio-spectrum waves. A carrier sine wave (in the image, the one with the higher frequency) is modulated (in amplitude) by another signal (the target of transmission). The carrier due to its appropriate frequency enables successful transmission of a signal that would otherwise be difficult to transmit (due to its too low frequencies) and also enables transmission of multiple channels at different carrier frequencies.

Classic example: AM radio.

I had this question on a quiz, it was X.

Answer:

X

Explanation:

A plane mirror produces a virtual and erect image. The distance of the image from the mirror is same as distance of object from the mirror. The image formed is of the same size as of the object. The image is produced behind the mirror.

In the given diagram, the image of the ball would form behind the mirror at position X which is at equal distance from mirror as the ball is.

7.5 seconds

Given u= initial velocity=30m/sec

          a= acceleration on moon=1.62m/s2

           h=180m

Using the equation

h = u(t) - 1/2gt² {where g = 1.62 m/s²}   and u = 30 m/s

180 = 30t - (0.5)(1.62)t²  

0 = 0.81t² - 30t +180  

solving the quadratic equation for the 2 t-values:  

t = 7.5 s or t = 30 s

Therefore; the time taken to reach a height of 180 m upwards is 7.5 seconds

Newton's second law of motion describes the relationship between force and acceleration. They are directly proportional. If you increase the force applied to an object, the acceleration of that object increases by the same factor. In short, force equals mass times acceleration.

Final answer:

Force is related to acceleration and gravity through Newton's second law of motion, where F = ma. Gravity causes objects to accelerate towards Earth at a constant rate of 9.8 m/s², regardless of mass. In scenarios like free fall, simple relations like v = u + at show the direct relationship between force and acceleration.

Explanation:

Force is related to acceleration and gravity through Newton's second law of motion. The formula representing this relationship is F = ma, where F is the force applied to an object, m is the mass of the object, and a is the resulting acceleration.

Gravity, as described by Newton's universal law of gravitation, causes objects to accelerate towards Earth at a constant rate of 9.8 m/s² near the surface of the Earth, regardless of their mass. This special property of gravity results in all objects experiencing the same acceleration due to gravity.

When considering a constant force and acceleration scenario, such as free fall in a uniform gravitational field without air resistance, simple relations like v = u + at can be derived, demonstrating the direct relationship between force and acceleration.

Answer:

The correct answer is: in the magma chamber.

Explanation:

The volcanoes are creating igneous rocks, and they can be intrusive and extrusive. The intrusive ones are forming deep into the ground, while the extrusive are forming on the surface. Where the rocks are formed makes a big difference in their crystals size. The rocks that form by magma that has cooled the deepest into the ground would have the largest crystals, thus the coarsest grains. The reason for this is that the magma that has been cooling the deepest into the ground will be exposed to higher temperatures and pressures, which will lead to a very slow cooling off. Because the cooling off will be at such a slow rate, the crystals will have enough time to became much larger. The deepest part of a volcano is its magma chamber, thus it will be the place that will produce the coarsest grained igneous rocks.

Explanation:

Start with the unbalanced equation:

KClO

3

→

KCl

+

O

2

A method that often works is to balance everything other than

H

and

O

first, then balance

O

, and finally balance

H

.

Another rule is to start with what looks like the most complicated formula.

The most complicated formula looks like

KClO

3

.

We put a

1

in front of it and mark the

1

to remind ourselves that the number is now fixed.

We can't change a coefficient unless we run into a roadblock (like having to use fractions).

My teacher never let me use fractions.

My solution when I hit a roadblock was to erase all the numbers and then start over again with a 2 as the starting coefficient.

We start with

1

KClO

3

→

KCl

+

O

2

Balance

K

:

We have 1

K

on the left, so we need 1

K

on the right. We put a

1

in front of the

KCl

.

1

KClO

3

→

1

KCl

+

O

2

Balance

Cl

:

Cl

is already balanced, with 1

Cl

on each side.

Balance

O

:

We have 3

O

atoms on the left and only

2

on the right. We need 1½

O

2

molecules on the right. Uh, oh! Fractions!

We start over with a 2 as the coefficient.

2

KClO

3

→

2

KCl

+

O

2

Now we have 6

O

atoms on the left. To get 6

O

atoms on the right, we put a 3 in front of the

O

2

.

2

KClO

3

→

2

KCl

+

3

O

2

Every formula now has a fixed coefficient.

We should have a balanced equation.

Let’s check:

Left hand side: 2

K

, 2

Cl

, 6

O

Right hand side: 2

K

, 2

Cl

, 6

O

All atoms balance.

The balanced equation is

The coefficient of KCl in a dissolution reaction is '1'. The question may be mixing up the concept of KCl dissolution with equilibrium constants for other reactions, such as CO2 with water. A chemical context is needed to provide a specific coefficient for KCl.

The question what coefficient of KCl appears to be asking for the coefficient (stoichiometric number) in front of the chemical formula KCl in a balanced chemical equation. However, to provide a specific coefficient, there needs to be a context of a complete chemical reaction. If the reaction is simply the dissolution of KCl in water, the coefficient is typically '1' because the dissolution equation would be KCl(s) → K+(aq) + Cl-(aq), with each ion being produced in a 1:1 ratio.

In chemistry, equilibrium constants, such as the solubility product constant (Ksp) for salts like KCl, are crucial for understanding the solubility and dissociation of compounds. The Ksp for KCl would be the product of the concentrations of the K+ and Cl- ions at equilibrium. The value of K you mentioned corresponds to the equilibrium constant for the reaction between carbon dioxide and water, which is different from the solubility product of KCl.

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Answer:

A

Explanation:

7 m/s I believe I would check with your teacher if anything

Answer:

its c i did usatestprep

Explanation:

Scientific law cannot be disproven. The correct statements are B and D are correct.

It is a statement about a natural phenomenon that does not have any scientific proof.

Therefore, scientific law cannot be disproven. The correct statements are B and D are correct.

Learn more about scientific laws:

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Because you don't have your banana milk, broski

...

Life... is a dream.

...

Life... is a story.

...

Life... is a creation of human kind.

...

Life............................ is 42.

Answer:

83.3 Wb

Explanation:

The magnetic flux linkage through the coil is given by:

[tex]N\phi = BAN sin \theta[/tex]

where

B is the magnetic field strength

A is the cross sectional area

N is the number of turns in the coil

[tex]\theta[/tex] is the angle between the direction of the field and the normal to the coil

In this problem:

B = 1.74 T

A = 0.133 m^2

N = 360

[tex]\theta=90^{\circ}[/tex]

Therefore, the magnetic flux linkage is

[tex]N\phi = (1.74 T)(0.133 m^2)(360) sin 90^{\circ}=83.3 Wb[/tex]

To find the displacement, draw a vector from your starting point to your end point and solve for the length of this line.

Hope this helps!

Davinia.

Displacement in physics is the overall change in position of an object. It can be computed using the equation Δx = x₁ - x₀ (final position - initial position). For more complex scenarios, you calculate the area between the velocity-time graph and time axis or use displacement vectors for multi-dimensional scenarios.

In Physics, displacement represents the overall change in an object's position. This is different from distance which accounts for the total ground an object covered. To calculate displacement, we need to know the initial and final positions of the object and use the equation, Δx = x₁ - x₀ where Δx is the displacement, x₁ is the final position, and x₀ is the initial position.

For example, If an object moves from position 3m (x₀) to position 8m (x₁), the displacement (Δx) would be 8m - 3m = 5m. This is a simplified example, for complex scenarios where there is varying speed or acceleration, you might need to calculate the area between the velocity vs. time graph and the time axis.

To visualize displacements in more than one dimension, we use displacement vectors. Here you would also need to take direction into account while calculating the overall displacement.

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it is 5 yds/s to run the football firld

Final answer:

To form a hypothesis, one must first make observations, identify a question, and conduct research to understand existing knowledge about the subject.

Explanation:

Before forming a hypothesis, it is essential to perform some initial steps according to the scientific method. These steps include making observations about natural phenomena, which might often involve reading existing scientific literature. After making these observations, the next step is identifying a question one would like to answer based on those observations. Following this, the scientist engages in research to find out what is already known about the topic. It is this research and understanding of the current knowledge that informs the development of a testable, evidence-based hypothesis.

Answer: Option C

Explanation: The chemical change can be defined as the change that once occurred cannot be reversed by any means.

The metal corrosion in the salt water is an example of chemical change as it cannot be reversed once the metal is corroded. This also results in the change in the color of the metal and further decaying of the metal at later stages.

Most likely climbing up the mountain

carrying twice the weight and climbing twice as high

Answer:

It sends signals that control heat rate and respiration

Explanation:

We breath without thinking this is because of the the autonomic nervous system.  (ANS) is an involuntary system it acts without our conscious control.

The  sensory-somatic nervous system do not control heat rate and respiration. Hence, option (A) is correct.

The nervous system containing sensory as well as the motors neurons is known as sensory-somatic nervous system. These are made up of the cranial and spinal nerves that transmit information from the skin, skeletal muscles to the Central Nervous System.

As per the given problem:

(A)

The sensory-somatic nervous system sends signals from skin and muscle to Central Nervous System, but it does not control heat rate and respiration. Hence, this statement is correct (means it is not the function of sensory-somatic nervous system).

(B)

Sensory-somatic nervous system receives messages and relays stimulus to contract muscle fibers. Hence, it is a function and the option is incorrect.

(C)

The sensory-somatic nervous system exchanges the information between the various organs to Central Nervous System. Hence, the option is incorrect.

(D)

At some instant, sending neuro signals directly to muscle and glands is also a function of  sensory-somatic nervous system. So, the option is incorrect.

Thus, we conclude that out of all the given options, the  sensory-somatic nervous system do not control heat rate and respiration. Hence, option (A) is correct.

Learn more about the sensory-somatic nervous system here:

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The horizontal range formula tells us

[tex]x=\dfrac{{v_i}^2\sin2\theta}g[/tex]

where [tex]v_i[/tex] is the dancer's initial speed, [tex]\theta[/tex] is her launch angle, and [tex]g[/tex] is the acceleration due to gravity. So

[tex]1.5\,\mathrm m=\dfrac{{v_i}^2\sin50^\circ}{9.8\frac{\rm m}{\mathrm s^2}}\implies v_i=4.4\dfrac{\rm m}{\rm s}[/tex]

Her initial velocity as a vector is

[tex]\vec v_i=v_{xi}\,\vec\imath+v_{yi}\,\vec\jmath[/tex]

where

[tex]v_{xi}=v_i\cos25^\circ=4.0\dfrac{\rm m}{\rm s}[/tex]

[tex]v_{yi}=v_i\sin25^\circ=1.9\dfrac{\rm m}{\rm s}[/tex]

Answer: 1.9m/s.

Explanation: 1.9m/s.