Igneous rocks are formed from _____.

sedimentary rocks
fossils and shells
magma
eroded land

Answer:

it is placed 9th in the periodic table

it is in the the 7th column and the 2nd period

it is a gas

it valence shell has 7 electrons and it can take 1 electron during ionic bonding

Explanation:

this is all that can into my mind. hope it helps

If we could magically remove sunspots from the sun, it would appear smoother and more uniform in its brightness. Sunspots are darker, cooler regions on the sun's surface caused by magnetic activity, which creates areas of intense magnetic fields that suppress the movement of heat and gas.

Removing sunspots would affect the sun's overall magnetic field, which could potentially impact the sun's activity and influence space weather. Sunspots are closely related to solar flares and coronal mass ejections, which can cause disruptions in communication and navigation systems on Earth.

However, it is important to note that sunspots are a natural occurrence of the sun and play a significant role in regulating the sun's temperature and energy output. Removing them could have unintended consequences and may not be a practical solution.

Instead, scientists study sunspots to better understand the sun's behavior and predict potential space weather events. They use tools such as the Solar Dynamics Observatory to monitor the sun's activity and gather data that can inform space weather forecasts and help protect our technological infrastructure.

In conclusion, while removing sunspots may seem like a solution, it is important to consider the potential consequences and the valuable role they play in our understanding and management of the sun's behavior.

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The acceleration of the boat is proportional to its speed at any given time.

To differentiate the expression v(t) = vi * e^(-ct) and show that the acceleration of the boat is proportional to the speed at any time, we can take the derivative of v(t) with respect to time.

Using the chain rule, the derivative of v(t) with respect to t can be calculated as follows:

dv/dt = -c * vi * e^(-ct)

This derivative represents the rate of change of speed with respect to time, which is the acceleration of the boat, denoted as a(t).

So, a(t) = dv/dt = -c * vi * e^(-ct)

Now, let's consider the expression for the speed at any time, v(t), in terms of the acceleration, a(t):

v(t) = vi * e^(-ct)

We can rearrange this expression to solve for e^(-ct):

e^(-ct) = v(t) / vi

Substituting this back into the expression for acceleration, we get:

a(t) = -c * vi * (v(t) / vi)

Simplifying the equation, we find that:

a(t) = -c * v(t)

This shows that the acceleration of the boat is proportional to the speed at any time, with the proportionality constant being -c. As the speed decreases, the acceleration will also decrease proportionally.

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Some benefits of using a scale model by planetary scientists are:

Scientists measure the distance between planets using a variety of methods, including triangulation, radial velocity method and scale model method. Scientists use triangulation to determine the distance from Earth to other planets. They observe the planet from two different positions on Earth and use the angles of observation to calculate the planet's distance.

Radial Velocity Method uses the Doppler shift of a planet's light to determine its distance. Scientists can determine how fast a planet is moving towards or away from Earth and use this information to calculate its distance.

Scale model method can be easily visualized and allows for easy comparison between different parts of the system. The model can be easily shared and discussed with colleagues, helping to build consensus and develop a deeper understanding of the system as a whole.

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The distance the wagons travel until the spring is fully compressed is 2 × xmax = 3.42 m. To solve this problem, we need to apply the principle of conservation of momentum and conservation of energy.

Initially, the momentum of the system is given by:

p1 = (15 kg + 5 kg) × 3.75 m/s = 75 kg m/s

After the collision, the two wagons stick together and move as one unit, with a combined mass of 30 kg. Let v be the common velocity of the two wagons after the collision. Then, the momentum of the system is given by:

p2 = 30 kg × v

According to the principle of conservation of momentum, p1 = p2. Therefore, we have:

75 kg m/s = 30 kg × v

which gives:

v = 2.5 m/s

Now, let's consider the energy of the system. Initially, the kinetic energy of the system is given by:

K1 = (1/2) × (15 kg + 5 kg) × (3.75 m/s)² = 421.875 J

After the collision, the energy of the system is stored in the compressed spring. The potential energy of a spring is given by:

U = (1/2) × k × x²

where k is the spring constant and x is the displacement of the spring from its equilibrium position. At maximum compression, the displacement is xmax, and the potential energy is:

Umax = (1/2) × 250 N/m × xmax²

According to the principle of conservation of energy, the initial kinetic energy of the system is converted to potential energy of the spring at maximum compression. Therefore, we have:

K1 = Umax

which gives:

xmax = sqrt(2 × K1 / k) = 1.71 m

Therefore, the distance the wagons travel until the spring is fully compressed is 2 × xmax = 3.42 m.

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The Metonic cycle is a period of almost exactly 19 years after which the lunar phases recur at the same time of the year.

The Metonic cycle is defined as ,235 synodic months is just 2 hours, 4 minutes and 58 seconds longer than 19 tropical years.

In Athens, at 5th century BC, give the cycle to be a whole number of days, 6,940. Using these whole numbers facilitates the construction of a lunisolar calendar.

A tropical year is longer than 12 lunar months and shorter than 13 of them. The arithmetic representation of  12×12 + 7×13 = 235 allows it to be seen that a combination of 12 "short" years (12 months) and 7 "long" years (13 months) will be almost  equal to 19 solar years.

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Answer:

if there isn't a shorting mechanism, the whole sets will be blown out several lamps and then shortened, the overall resistance of the remaining operating lamps will be decreased resulting in an increased working current that is adequate to blast the fuse

The centripetal acceleration is determined using the formula for centripetal acceleration, which relates the radius and angular velocity. To convert to multiples of g, the acceleration is divided by the acceleration due to gravity, which is approximately 9.8 m/s².

To calculate the angular velocity in radians per second, we use the formula:

angular velocity (ω) = 2π × revolutions per minute (rpm) / 60

Given that the propeller spins at 1500 rev/min, we can calculate the angular velocity:

ω = 2π × 1500 / 60 = 314.16 rad/s

The linear speed of the propeller tip can be found using the formula:

linear speed (v) = radius × angular velocity

Since the diameter of the propeller is given as 2.95 m, the radius is half of that:

radius = 2.95 m / 2 = 1.475 m

Now we can calculate the linear speed:

v = 1.475 m × 314.16 rad/s = 462.9 m/s

(c) The centripetal acceleration (ac) of the propeller tip can be calculated using the formula:

centripetal acceleration (ac) = radius × angular velocity²

Using the values we already determined:

ac = 1.475 m × (314.16 rad/s)² = 146,448.52 m/s²

To convert this acceleration to multiples of g (acceleration due to gravity), we divide by the acceleration due to gravity:

acceleration in g = ac / 9.8 m/s²

Therefore,

centripetal acceleration in m/s²: 146,448.52 m/s²

centripetal acceleration in g: 14,931.56 g

The angular velocity is calculated by converting the given revolutions per minute to radians per second using the conversion factor 2π/60.

The linear speed is obtained by multiplying the radius of the propeller by the angular velocity.

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Venus has relatively few impact craters and these craters are distributed fairly evenly over the entire planet.

-This suggests that older impact craters were covered over everywhere on the planet.

The solar system is an arrangement of the sun and the planets. The sun is at the focus of the solar system and it is surrounded by the planets moving radially outwards from the focus. This is the heliocentric model of the solar system.

Now, the magnitude of gravity on a planet determines the weight of a body on that planet. The greater the gravitational pull, the greater the weight of the object on that planet.

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If you are not part of the electrical ground current, it reduces the likelihood and severity of electrical injury, but it does not completely eliminate the risk.

For example, if you come into contact with an energized conductor or a high-voltage source, you can still experience electric shock or burns due to the flow of electrical current through your body. The severity of the injury may vary depending on factors such as the voltage, current, duration of contact, and the path the current takes through your body.

Additionally, electrical arcs or sparks can cause collateral injuries, such as burns, thermal injuries, or falls, which can occur even if you are not part of the electrical ground current.

It is important to exercise caution and follow proper electrical safety procedures to minimize the risk of electrical injury, regardless of your direct connection to the electrical ground current.

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Answer:

100km/hr

Explanation:

From the problem statement we know that distance of the trip is 115km

Expected time for the trip = 1.2hrs

→ If she spends the first half-hour going 90km/hr,

    Here  time  = 0.5hr

              speed  = 90km/hr

 The distance covered;

    Distance covered   =  Speed x time

    Distance covered  = 90 x 0.5  = 45km

→The remaining distance will be:

        Total distance - distance covered

              115km  - 45km  = 70km

→ The remaining time;

      1.2hr - 0.5hr  = 0.7hr

 Speed  = \(\frac{distance}{time}\)  

  Insert the parameters and solve;

  Speed  = \(\frac{70}{0.7}\)   = 100km/hr

For the remaining lap, the tourist must travel at a rate of 100km/hr to catch up.

Answer:

The penguins are gliding foward without stopping because there is no external force changing their state.

Explanation:

Newtons first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

The velocity of the toy car at the bottom of the ramp can be given as v = √(19.6 h) m/s. A toy car weighing 3.0 kg is released at the top of a frictionless track on the left. It rolls off the track from its right side ramp.

P.E. = mgh

= 3.0 kg × 9.8 m/s² × h

= 29.4 h J

Where, m = mass of the toy car, g = acceleration due to gravity, and h = height of the top of the track. Since the track is frictionless, the kinetic energy of the toy car at the bottom of the ramp is the same as its potential energy at the top of the track. Therefore, we can say that,

K.E. = P.E.

= 29.4 h J

Let the velocity of the toy car be v at the bottom of the ramp. By the law of conservation of energy,

K.E. = Wf - Wi where, Wf = work done by the friction on the toy car

Wi = work done by the gravity on the toy car

By the condition of the problem, the friction between the car and the ramp is absent. Hence, Wf = 0J.And, Wi = P.E. = 29.4 h J.

Therefore, K.E. = Wf - Wi

= 0 - 29.4 h J

= -29.4 h J

Also, the kinetic energy can be calculated as, K.E. = (1/2)mv² where, m = mass of the toy car, and v = velocity of the toy car at the bottom of the ramp.

Substituting the values, we get,

29.4 h J = (1/2) × 3.0 kg × v²v²

= 19.6 h m²/s²v

= √(19.6 h) m/s

Hence, the velocity of the toy car at the bottom of the ramp can be given as v = √(19.6 h) m/s.

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Answer:

Terrorists:scary,ruthless,morbid. Pretty:beautiful,sweet. Gay:happy,sweet,nice

Explanation:

Reeee

Answer:

its density decreases it volume increases

Explanation:

When water turns to ice, it expands / contracts. Water is more / less dense than ice. The water you drink is a solid / liquid / gas.

the formula for (momentum) P = (force) F * (Mass) M

P = FM

if mass = 0 momentum = 0

Hope this helps...

Answer:

In terms of an equation, the momentum of an object is equal to the mass of the object times the velocity of the object. ... The equation illustrates that momentum is directly proportional to an object's mass and directly proportional to the object's velocity. The units for momentum would be mass units times velocity uni

Explanation:

Answer:

79.8 is the answere

I hope this HELP :)

Explanation:

Here, initial velocity is u=18.5m/s and final velocity is v=46.1m/s

Time taken t=2.47s

If a be the acceleration of the car.

Using v=u+at,

46.1=18.5+a(2.47)

⟹ a=11.17m/s

2

If d be the distance traveled by car.

Using formula v

2

−u

2

=2ad,

(46.1)

2

−(18.5)

2

=2(11.17)d

⟹ d=79.8m

Answer:

B Relesing the string

Explanation:

got it right on edge

Answer:

b .

          :)    :)    :)

Explanation:

The student's statement about the rods having poles is not completely accurate, the general idea that objects with the same type of charge will repel each other is correct.

The student is partially correct, but the analogy with magnets is not completely accurate. Like magnets, charged objects have two types of poles, but they are called positive and negative poles. Two objects with the same type of charge (both positive or both negative) will experience a repulsive force, while objects with opposite charges will attract each other.

In the case of the rods which is given, if they are charged with the same type of charge, they will repel each other due to the electrostatic force between them. This force is similar to the magnetic force between two magnets with the same polarity, but the underlying physical principles are different.

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The graph that corresponds to 0.1 s in one complete cycle is graph D.

option D is the correct answer.

The period of a wave is the time for a particle on a medium to make one complete vibrational cycle. Period, being a time, is measured in units of time such as seconds, hours, days or years.

Also, the period of a wave is the amount of time it takes for a wave to complete one wave cycle or wavelength.

From the given parameter, the coil rotates 10 times in one second. The period of the coil is calculated as;

Period = 1 s / 10

Period = 0.1 s

From the graphs, the only option that has one complete cycle in one second is option D.

Check option D, half cycle is 0.05 s and one full cycle is 0.1 s.

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Answer:

If a piece of iron is brought near a permanent magnet, the electrons within the atoms in the iron orient their spins to match the magnetic field force produced by the permanent magnet, and the iron becomes “magnetized.”

Explanation:

i dont know how to add align and domain

Answer:

A. Gamma rays

or D. microwaves

Explanation:

correct me if i am wrong

Answer:

a) Mat swum 100 meters.

b)after 4 length , Mat's displacement is zero.

Explanation:

As given, Mat and David are training for the swimming team , and Length of 1 side of the pool is 25 meter.

As swimming pool will be a cube or a cuboid , so it has only 4 sides.

a)

1 length = 23 meter

⇒4 length = 4×25 = 100 meter

So, Mat swam 100 meters.

b)

As after swam 4 lengths of the pool, Mat reaches to its initial position i.e Mat come back to its starting point.

As Displacement is always measures from the starting point.

So, after 4 length , Mat's displacement is zero.

The force pushing the cart in the forward direction is 43.7 N.

The component of force pushing the cart against the floor is 31.74 N.

The force pushing the cart in the forward direction or the horizontal component of the force is calculated as follows;

Fₓ = F cosθ

where;

Fₓ = 54 x cos(36)

Fₓ = 43.7 N

The component of force pushing the cart against the floor is the vertical component of the force and it is calculated as;

Fy = F sinθ

Fy = 54 x sin(36)

Fy = 31.74 N

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Answer:

B. a piece of paper being torn

Explanation:

A chemical change is one that cannot be reversed. This means the original properties of the substance or object cannot be restored.

If you cook a raw egg, it would turn into a boiled egg (or a poached egg, however it is being cooked). The reaction is irreversible, so you cannot turn the cooked egg back into a raw egg - it is basically impossible to 'uncook' an already cooked egg.

When you toast a piece of bread, it turns into toast. You can't 'untoast' it back into bread. The chemical changes have already occurred and cannot be undone.

If you tear a piece of paper, it is still paper. You are only ripping it, not changing anything about it. You could simply tape the torn bit back to the original bit, or glue it - either way, it is still paper and nothing has occurred to drastically change the physical state of it.

Therefore, B is not a chemical change.