A force of 2 newtons is required to stretch a spring 4 cm. The amount of force required to stretch the same spring 8 cm is _____ newton(s)

a) 1
b) 2
c) 4
d) 8

Answer:

D) constant negative acceleration

Explanation:

Acceleration is defined as the ratio of changing of the velocity per unit time:

[tex]a=\frac{\Delta v}{\Delta t}[/tex]

where v is the velocity and t the time.

In a velocity-time graph, as the one above, the ratio between change in velocity and change in time corresponds to the slope of the curve. In fact, the slope of the curve is defined as

[tex]m=\frac{\Delta y}{\Delta x}[/tex]

where

[tex]\Delta y[/tex] is the increment in the y-variable, which corresponds to the change in the velocity, [tex]\Delta v[/tex]

[tex]\Delta x[/tex] is the increment in the x-variable, which corresponds to the change in the time, [tex]\Delta x[/tex]

So, since the slope in this case is 1) constant and 2) negative, this means that the acceleration is also constant and negative.

Answer:

It’s c. Constant positive acceleration

Explanation:

➷ After 10,000 years the mass will be:

1,000 / 2 = 500

After 20,000 years the mass will be:

500/2 = 250

As you can see, the correct answer would be A. 20,000 years

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

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Answer:

A). [tex]t = 20,000 years[/tex]

Explanation:

Half life is the total time after which the substance will decay and remains only half of the initial amount

So here we will say that

initial amount is 1000 gram

Now after one half life only half of the amount will remain

so it is

[tex]m_1 = 1000/2 = 500 gram[/tex]

now again after another half life it will remain half of the initial amount

so it is

[tex]m_2 = 500/2 = 250 gram[/tex]

so it took two half lives

[tex]t = 10,000 + 10,000[/tex]

[tex]t = 20,000 years[/tex]

(A) is the answer for #4

- They require a physical medium to propagate.

- They can be described in terms of frequency, wavelength, and amplitude.

- They can be refracted, reflected, and diffracted.

- They can transfer energy from one point to another.

Your answer would be - It increases friction by air resistance.

Hope this helps you:)

Feel free if you want me to clarify something!

A parachute slows a skydiver's descent by increasing air resistance, acting against the skydiver's downward momentum. The parachute's increased surface area amplifies this resistance, significantly reducing speed for a safer landing.

A parachute assists a skydiver during landing by increasing air resistance, which slows the skydiver's descent by increasing the upwards force of air pushing against the diver. The open canopy of the parachute expands the surface area against which the air pushes, thereby increasing the air resistance. Initially, the skydiver is in free fall, attaining a maximum or 'terminal' velocity depending on body position. For instance, terminal velocity can be as high as 350 km/h in a headfirst position. The deployment of the parachute dramatically reduces this speed due to the increased air resistance.

It's like dropping a baseball and a tennis ball from the same height at the same time; the baseball will hit the ground first due to less air resistance compared to the lighter tennis ball.

The parachute's role is essential to slow a skydiver's fall, reducing the risk of injury upon landing by decreasing the skydiver's change in momentum on impact.

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With a broken line????????

Answer:

broken line

Explanation:

(a) 11.1 m/s

The acceleration of the skier is given by:

[tex]a=\frac{F}{m}[/tex]

where F = 92 N is the net force and m = 68 kg. Substituting,

[tex]a=\frac{92 N}{68 kg}=1.35 m/s^2[/tex]

After 8.2 s, the speed of the skier is

[tex]v=at[/tex]

where

a = 1.35 m/s^2 is the acceleration

t = 8.2 s is the time

Substituting,

[tex]v=(1.35 m/s^2)(8.2 s)=11.1 m/s[/tex]

(b) 10.0 m/s

In this section of the hill, the net force is F = -22 N backwards. So, the acceleration of the skier is

[tex]a=\frac{F}{m}=\frac{-22 N}{68 kg}=-0.32 m/s^2[/tex]

When starting this section, the skier is moving at u = 11.1 m/s. So, the final speed will be:

[tex]v=u+at[/tex]

And substituting t=3.5 s, we find

[tex]v=11.1 m/s+(-0.32 m/s^2)(3.5 s)=10.0 m/s[/tex]

(c) 237.9 m

The distance travelled by the skier in the downhill section is

[tex]d=\frac{1}{2}at^2[/tex]

where a = 1.35 m/s^2 and t = 8.2 s. Substituting,

[tex]d=\frac{1}{2}(1.35 m/s^2)(8.2 s)^2=45.4 m[/tex]

The distance travelled by the skier in the levelled out section is given by

[tex]v^2 - u^2 = 2ad[/tex]

where

v = 0 is the final speed

u = 11.1 m/s is the initial speed

a = -0.32 m/s^2 is the acceleration

d is the distance

Solving for d,

[tex]d=\frac{v^2-u^2}{2a}=\frac{0-(11.1 m/s)^2}{2(-0.32 m/s^2)}=192.5 m[/tex]

So, the total distance is

d = 45.4 m + 192.5 m = 237.9 m

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.

When 2 electric charges are place close to each other they experience a force between them. This force may be repulsive or attractive depending on the type of charges involved.

The magnitude of this force depend on the quantity of individual charges and the distance between them.

The force is defined  by the Coulomb's law states that: The magnitude of the electrostatic force of attraction or repulsion between two point charges is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them.

The formula for calculating the force between 2 electric charges is ;

F = (kq₁q₂)/d²

Where  k is the proportionality constant known as Coulomb's constant,

            q₁ and q₂ are the charges and

            d is the distance between q₁ and q₂.

Answer:

C

Explanation:

I did the test kinda sorta and I got this.

Hello

The formula for centripetal force is:

Fc = m*[(V^2)/r]

Where

m = 329000 g

V = 34 m/s

r = 33 m

Then

Fc = (329000)*[(34^2)/33]

Fc = 11.524.969,7

Best regards

1 KG=9.8 newtons.

Thus ,

[tex]650N*\frac{1 KG}{9.8N}=around 66.3[/tex]

A person weighs 650 N and weight is the product of mass and acceleration due to gravity, so the mass of the person will be 66.32 kg.

Gravitational acceleration is the acceleration that an object experiences as a result of the gravitational force. It has the SI unit meter per second square. Indeed a direction and a magnitude are present. It is therefore a vector field.

We use the letter G to denote gravitational acceleration. Its normal value for the earth's surface at sea level is 9.8 m/s². Based on Newton's Second Law of Motion and Law of Universal Gravitation, its calculation.

Given information according to the question is,

Weight, w = 650 N

[tex]Weight(w) = Mass(m)*Acceleration\ due\ to\ gravity(g)[/tex]

650 N = m × 9.8 m/s²

m = 650 / 9.8

m = 66.32 kg.

Therefore, the mass of the person is 66.32 kg.

To know more about acceleration due to gravity :

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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.

A rocket ascending from Earth passes through the atmosphere in the following order: troposphere, stratosphere, mesosphere, thermosphere, and then the exosphere.

The question pertains to the order in which a rocket would pass through the layers of Earth's atmosphere. The layers of the atmosphere, starting from the surface of Earth moving outward into space, are the troposphere, stratosphere, mesosphere, thermosphere, and finally the exosphere. As a rocket ascends from Earth's surface on its journey into space, it first moves through the troposphere, where weather phenomena occur, then into the stratosphere, known for its ozone layer that absorbs and scatters the sun's ultraviolet radiation. Following the stratosphere, the rocket enters the mesosphere, where meteors burn up upon entry. The journey continues through the thermosphere, the largest layer, where auroras occur and temperatures increase significantly with altitude due to solar radiation absorption. Finally, the rocket reaches the exosphere, the outermost layer where Earth's atmosphere merges into the vacuum of space.

Answer:

dependent on the type of gas and the mass of a mole of the gas

Explanation:

Potassium iron magnesium aluminum silicate hydroxide and Potassium magnesium aluminum silicate hydroxide.

The two elements present in biotite mica but absent in muscovite mica are iron (Fe) and magnesium (Mg). This difference is observable in the chemical formulas of the two minerals. Both types are phyllosilicate minerals but have different chemical compositions.

The two elements present in biotite mica that are not present in muscovite mica are iron (Fe) and magnesium (Mg). Biotite mica is a type of phyllosilicate mineral that contains these two elements. On the other hand, muscovite mica, although also a type of phyllosilicate mineral, does not contain iron and magnesium.

In chemical terms, the formulas for these minerals summarize their differences. Biotite's formula is K(Mg,Fe)3AlSi3O10(OH)2, while muscovite's formula is KAl2(AlSi3O10)(OH,-F)2. In the formulas, you can clearly see that both contain potassium (K), aluminum (Al), silicon (Si), and oxygen (O), but only biotite has iron and magnesium.

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C

The object is at rest or is traveling at constant velocity.

Acceleration is rate of change of velocity and velocity is a vector quantity which means that it is speed with direction.

If acceleration is zero it means that velocity is constant.

Constant velocity may include zero velocity or "at rest"

and

Speed is zero or speed is constant and no change in direction

When the acceleration of an object is zero, the object can either be traveling at a constant velocity or be at rest.

If the acceleration of an object is zero, the possible motion of the object can be described as either traveling at a constant velocity or being at rest. This means that the object can be moving at a steady speed in a straight line or not moving at all. It is important to note that even though the object is at rest, it is still considered to have a constant velocity because velocity includes both speed and direction.

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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

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.

in this since your volume remains at a constant you'll need to use Gay-Lussacs law, p1/t1=p2/t2.

your temp should be converted in kelvin

variables:

p1=3.0×10^6 n/m^2

t1= 270k

just add 273 to your celcius

p2= ? your solving for this

t2= 315k

then you set up the equation

(3.0×10^6)/270= (x)(315)

you then cross multiply

(3.0×10^6)315=270x

distribute the 315 to the pressure.

9.45×10^8=270x then you divide 270 o both sides to get

answer

3.5×10^6 n/m^2

C would be the answer

the process of restoring land that has been mined so I guess the answer would be C.

"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.

The frequency of a wave is the inverse of the wave's period.

(Instead of "inverse", the word "reciprocal" is more appropriate.  

It means that [ frequency = 1/period ], and [ period = 1/frequency ].

The easiest way to remember both of these is to just remember that (frequency) x (period) = 1 .)

Answer:

period

Explanation:

Label A:

Nitrogen bases

Label B:

Sugar-phosphate backbone

Answer:

Nitrogen bases

Sugar-phosphate backbone

Explanation:

When the voltage in the circuit is increased, the following will happen: The correct choices are: a, c, and d.

Current (a): According to Ohm's Law, which is given by the formula  (where  is voltage,  is current, and  is resistance), if the voltage () increases and the resistance () remains constant, the current () will increase. This happens because current is directly proportional to voltage. So, an increase in voltage leads to an increase in current.

Resistance (b): Resistance in a circuit is typically a property of the materials involved and does not change with the voltage applied. For most materials and simple circuits, the resistance remains constant regardless of changes in voltage. Therefore, increasing the voltage does not increase the resistance.

Magnetic force (d): Magnetic force generated in a circuit, particularly around conductors, depends on the current flowing through the circuit. Since increasing the voltage (with constant resistance) leads to an increase in current, the magnetic force would also increase as a result.

I wanna say it’s C.

Answer:

C. 20c

Explanation:

Without additional information on Haley's flying speed and the distance between flowers, we cannot calculate the number of times she could fly between the two flowers in one minute.

To determine how many times Haley could fly between the two flowers in 1 minute, we need additional information such as the distance between the flowers and the speed at which Haley flies. Since this information is not provided, we cannot accurately calculate the number of times Haley could make the trip. We can however provide information on how to approach the problem once the relevant data is available.

If we knew the flight time for one trip between the flowers, we could divide 60 seconds by that flight time to find out how many trips could be made in a minute. For example, if it takes Haley 5 seconds to fly between two flowers, then she could make 12 trips in one minute (60 seconds divided by 5 seconds per trip).

Final answer:

Lifting an object to a greater height increases its gravitational potential energy. The potential energy is calculated as the product of the object's mass, gravitational acceleration, and height. Tripling the height triples the potential energy.

Explanation:

When an object is lifted higher off the ground, it gains gravitational potential energy proportional to its height above the ground. This potential energy (PE) depends on the mass of the object (m), the acceleration due to gravity (g), and the height (h) above the ground. For the given 1360 kg automobile, the potential energy can be calculated using the equation PE = mgh. If we know the car gains a certain amount of potential energy at a height of 12 meters, lifting it to 36 meters, or three times that height, will result in three times the potential energy. To demonstrate, let's say the car is lifted to 36.6 m, the potential energy will be PE = 1360 kg × 9.81 m/s² × 36.6 m.

Answer:

Mass: 750 kg, weight : 0

Explanation:

- The mass represents the amount of matter in an object, and it is an intrinsec property of the object: this means that its value does not depend on the location of the object. Therefore, a rock will have the same mass on earth, on Mars, in the outer space.. no matter its location. So, the mass of the rock in space is still 750 kg.

- The weight of an object corresponds to the gravitational force exerted on the object by the surrounding gravitational field.

On earth, the weight of an object is given by

[tex]W=mg[/tex]

where m is the mass and g is the gravitational acceleration, whose value on earth is g=9.81 m/s^2.

In space, there is no gravity (assuming we are far enough from any other celestial object): since there is no gravitational field, g=0, so the weight of the object is also zero.

The mass of the rock remains unchanged in outer space, but its weight would effectively become zero without a significant gravitational field acting upon it.

When a rock with a mass of 750 kg is taken into outer space, its mass remains unchanged, as mass is a measure of the amount of matter in an object and does not depend on gravity. However, its weight would be affected dramatically because weight is the force exerted by gravity on that mass. In outer space, away from the gravitational pull of a large body like Earth, the rock would be weightless. For example, while the rock weighs 7,350 N on Earth due to Earth's gravity (approximately 9.81 m/s²), on the Moon, it would weigh significantly less, only around 1,237.5 N, because the Moon's gravity is approximately 1.67 m/s². This demonstrates that weight is variable and contingent upon the gravitational field in which the object is located.

A positive charge cause dosent your hair static up when that happens or no?

The negative charges transfer from your hair to the comb, this leads the comb to be negatively charged and your hair to become positively charged.