Please help me with homework

Answer:

the one right behind 600 and the one in between 600 and 700

Explanation:

Final answer:

Scientists determine the presence of elements in the stars' atmospheres by analyzing their atomic spectra, which are obtained by spreading out the light emitted by stars into a spectrum using a spectrograph. The spectrum shows dark lines or absorption lines that indicate the presence of specific chemical elements.

Explanation:

Scientists determine what elements are present in distant stars by analyzing the light that comes from stars and finding the atomic spectrum of elements in that light. By using a spectrograph to spread out the light into a spectrum, scientists can observe the presence of elements in the stars' atmospheres. The spectrum shows dark lines or absorption lines that are produced by atoms in the atmospheres of stars and absorb light at certain wavelengths, providing evidence of the presence of specific chemical elements.

the correct answer A                                                  

Hello, the answer is d. A

Best regards

answer would be A becuz that's the only reasonable choice according to real life situations

The best hypothesis for this experiment is that if I increase the pressure outside an air-filled balloon, then the balloon will become smaller. Hence, option (a) is correct.

The force perpendicularly applied to an object's surface divided by the area over that it is dispersed is known as pressure. The pressure as compared with the surrounding air pressure is referred as gauge pressure.

To express pressure, a variety of measures are employed. Some of these come by dividing a unit of force by a unit of area; for instance, the SI unit of pressure, the pascal (Pa), is equivalent to one newton per square meter (N/m2), whereas the conventional unit of pressure in the metric and U.S. conventional systems is the pound-force per square inch (psi).

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False because the Ionsophere lies between the Mesosphere and the Theromsphere. If can can you give me brainliest :o ?

It varies with the total volume of the fluid.

Answer:

56.9 fN

Explanation:

The force exerted on the electron is:

[tex]F=Bqv[/tex]

where

B is the magnetic field strength

q is the electron's charged

v is the speed of the electron

In our problem,

B = 0.049 T

[tex]q=1.6\cdot 10^{-19} C[/tex]

[tex]v=7.26\cdot 10^6 m/s[/tex]

Therefore, the force is

[tex]F=(0.049 T)(1.6\cdot 10^{-19} C)(7.26\cdot 10^6 m/s)=5.69\cdot 10^{-14} N=56.9 fN[/tex]

The most destructive kind of mass movement a landslide.

Landslide is the most destructive kind of mass movement.

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energy is the ability to do work or change

Final answer:

Energy is defined as the capacity to do work or cause change, with work being a transfer of energy in the form of a force moving an object over some distance.

Explanation:

The ability to do work or cause change is called energy. When we use energy to perform tasks, such as throwing a ball or warming a house, we are actually transferring energy from one object or system to another. This transfer can occur in the form of work or heat. Specifically, work is done when a force causes matter to move against an opposing force. An example of this would be when you inflate a bicycle tire; you are doing work on the tire by moving air into it against the pressure of the air inside the tire.

In the realm of physics, work is quantified as the product of force exerted on an object and the distance the object moves as a result, which is mathematically expressed as W = F x Δx. The work-energy theorem further relates this work to changes in an object’s kinetic energy, supporting the idea that energy is essential for doing work and causing changes.

18.9 but round it and you get 19

In this case if given those choices your answer would be (C. 19).

However in more complicated Chemistry rules you would learn that the periodic table only showcases 1 of the many possible masses of the element.

Hope this help! :D  

For the ball to go straight into the goal, the kicker needs to be no more than 6.54 meters away from the goal.

For the ball to arc into the goal, the kicker needs to be between 58.5 and 65.1 meters away from the goal.

How long does it take for the ball to reach the goal?

Let the distance between the kicker and the goal be [tex]x[/tex] meters.

Horizontal velocity of the ball will always be [tex]26.2\times\cos{34.2\textdegree}[/tex] until it lands if there's no air resistance.

The ball will arrive at the goal in [tex]\displaystyle \frac{x}{26.2\times\cos{34.2\textdegree}}[/tex] seconds after it leaves the kicker.

What will be the height of the ball when it reaches the goal?

Consider the equation

[tex]\displaystyle h(t) = -\frac{1}{2}\cdot g\cdot t^{2} + v_{0,\;\text{vertical}} \cdot t + h_0[/tex].

For this soccer ball:

[tex]\displaystyle t=\frac{x}{26.2\times\cos{34.2\textdegree}}[/tex]

when the ball reaches the goal.

[tex]\displaystyle h= - 9.81 \times \frac{x^2}{(26.2\times\cos{34.2\textdegree})^2} + (26.2 \times \sin{34.2\textdegree})\times\frac{x}{26.2\times\cos{34.2\textdegree}} \\\phantom{h} = -\frac{9.81}{(26.2\times\cos{34.2\textdegree})^2}\cdot x^{2} + \frac{\sin{34.2\textdegree}}{\cos{34.2\textdegree}}\cdot x[/tex].

Solve this quadratic equation for [tex]x[/tex], [tex]x > 0[/tex].

In other words,

My guess is Wedge & Pulley

Answer:

The answer is B. It is the one that has the triangle pointing up on the topside of the rope and seems to be a bit bigger than the other triangles.

Explanation:

Answer:

The second option with a vertex pointing upwards.

Explanation:

A wave is a disturbance that can be transmitted through a medium without causing a permanent displacement of the particles of the medium. The two types are; longitudinal and transverse.

In transverse wave, the direction of propagation of the wave is perpendicular to the direction of vibration of the particles of the medium. Examples are; water waves, light waves, X-ray etc. While in longitudinal waves, the direction of vibration of the particles is parallel to the direction of propagation of the waves. Examples are; waves in a slinky, waves in a rope, sound waves etc.

A wave in a rope is a form of longitudinal waves. When two wave pulses move toward each other, interference is observed.

The answers are:

A. Tension

B. Air resistance

C. Friction

E. Applied force

Let's discard each given option in order to find what forces requires physical contact:

A. Tension, correct: Tension force appears when it's a force pulling another object, trying to move it in the same direction, the tension usually involves a rope or cable used to pull another object. For example, a mass being held with a rope/cable.

B. Air resistance, correct: Air resistance, or drag, is a force acting in the opposite direction of a body in motion when it's passing through the air, involving contact between the air molecules and the surface of the object. For example, when an airplane is flying, it's being affected by the air resistance, making it move slower.

C. Friction, correct: The friction appears when there is an object surface being in contact with another object surface, both or just one can be in motion, the frictional forces always go in the opposite direction of the motion. For example, when you try to pull a box from a place to another, there is always a force that opposes to the movement, making you to apply more force in order to move the object,  it's the frictional force.

D. Magnetic force, incorrect: Magnetic force does not require physical contact between objects. The magnetic force acts on an object, pulling or attracting it. For example, using a magnet to attract a metallic object does not involve any physical contact, the force acts on the metallic object attracting it with no contact.

E. Applied force, correct: The applied forces involve physical contacts, applying forces on an object can result in the object motion. For example, pushing a button, the button us bein affected by an applied force and it will move in the same direction that the force.

Have a nice day!

Answer:

A. Tension

B. Air resistance

C. Friction

E. Applied force

Explanation:

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will  

A. Remain stable  

B. Stay the same element  

C. Release charged particles and no energy  

D. None of the above

The actual answer is that it will change into a different element altogether.

Answer:

D.None of the above.

Explanation:

We are given that uranium-238 undergoes alpha decay.

Therefore, uranium-238 change into into new element of atomic number 2 less and mass number 4 less and releasing an alpha particle  because it undergoes alpha decay

U-238[tex]\rightarrow [/tex]an atome with atomic number 2 less and mass number 4 less+ helium particle with atomic number 2 and mass number 4

Alpha decay: When an element undergoes an alpha decay then it transform into an atom with atomic number 2 less and mass number 4 less due to emission of alpha particle (alpha particle means helium particle which have atomic number 2 and mass number 4)

Therefore, option A is false.

B. It is also false.Because  a new atom is formed and there is no releasing  of charged particle

C.There is no any releasing of charged particle and no energy.Hence, it is false.

Answer :D. None ob the above.

-40 is the correct answer

Hey i am here to help you.

A: 2 concrete blocks 6cm apart will have the least gravitational attraction to each other.

I believe that this answer was helpful.

Pyramid of numbers: relative number of individual organisms at each trophic level in an ecosystem. Pyramids of energy show the relative amount of energy available at each trophic level. On average, about 10 percent of the energy available within one trophic level is transferred to the next trophic level.

HOPE THIS HELPED!!! XD

Represents a:

A Trophic Level

1) Charge: [tex]7.5\cdot 10^{-8} C[/tex]

Explanation:

The electrostatic force between the two shirts is:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where

k is the Coulomb's constant

q1 = q2 = q is the charge of each shirt (they are equally charged)

r = 4 cm = 0.04 m is the distance between the shirts

F = 0.5 N is the force

Re-arranging the equation, we can find q, the charge of each shirt:

[tex]q=\sqrt{\frac{Fr^2}{k}}=\sqrt{\frac{(0.5 N)(0.01 m)^2}{9\cdot 10^9}}=7.5\cdot 10^{-8} C[/tex]

2) Force if they are separated by 4 cm: 0.03 N

In this case, the force between the two shirts would be:

[tex]F=k\frac{q_1 q_2}{r^2}=(9\cdot 10^9)\frac{(7.5\cdot 10^{-8}C)^2}{(0.04 m)^2}=0.03 N[/tex]

Answer:

C. 7.4E-6C, 0.03 N

Explanation:

At the player's maximum height, their velocity is 0. Recall that

[tex]{v_f}^2-{v_i}^2=2a\Delta y[/tex]

which tells us the player's initial velocity [tex]v_i[/tex] is

[tex]0^2-{v_i}^2=-2g(0.65\,\mathrm m)\implies v_i=3.6\dfrac{\rm m}{\rm s}[/tex]

The player's height at time [tex]t[/tex] is given by

[tex]y=v_it-\dfrac g2t^2[/tex]

so we find their airtime to be

[tex]0.65\,\mathrm m=\left(3.6\dfrac{\rm m}{\rm s}\right)t-\dfrac g2t^2\implies t=0.36\,\mathrm s[/tex]

Answer:

A satellite orbiting the Earth

Explanation:

Kinetic energy is the intrinsic energy possessed by an object in motion.  The bigger the object in motion, and the higher its speed , the higher the kinetic energy. The equation below is used to calculate this energy also referred to as the work put into the object to accelerate it into its current velocity.

E(k) = 1/2 * m * v²

The best example of kinetic energy in the options provided is 'A satellite orbiting the Earth'. Kinetic energy specifically refers to the energy possessed by an object in motion, such as a satellite that is constantly moving in its orbit around the Earth.

The best example of kinetic energy among the given options is: 'A satellite orbiting the Earth'. Kinetic energy is the energy of motion. Therefore, any object in motion possesses kinetic energy. The satellite orbiting the Earth is in constant motion; thus, it has kinetic energy. The other examples like a book sitting on a bookshelf, a golfer preparing to putt the ball, and a race car in position at the start line are instances of potential energy or energy that is stored and has the capability to do work but isn't actively doing so.

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The electric force is a force that is inversely proportional to the square of the distance. This can be proved by Coulomb's Law, which states:

"The electrostatic force [tex]F_{E}[/tex] between two point charges [tex]q_{1}[/tex] and [tex]q_{2}[/tex] is proportional to the product of the charges and inversely proportional to the square of the distance [tex]d[/tex] that separates them, and has the direction of the line that joins them"

Mathematically this law is written as:

[tex]F_{E}= K\frac{q_{1}.q_{2}}{d^{2}}[/tex]    (1)

Where [tex]K[/tex] is a proportionality constant.

Now, if we say [tex]q_{1}[/tex] is the proton and [tex]q_{2}[/tex] is the electron, and cut the distance between them in half, the new distance will be [tex]\frac{d}{2}[/tex].

Substituting this new distance in equation (1):

[tex]F_{E}= K\frac{q_{1}.q_{2}}{(\frac{d}{2})^{2}}[/tex]   (2)

[tex]F_{E}= 4K\frac{q_{1}.q_{2}}{d^{2}}[/tex]     (3)>>>As we can see, the force becomes four times stronger

Answer:

The Answer Is C

Explanation:

Delta means change usually

Answer: A) Change in velocity

Explanation:

USA test prep

Answer:

The answer is B

That operates against motion when two objects are touching

Explanation:

Friction is a force that operates against motion when two objects or surfaces are touching. Friction is applied in the direction that is opposite the direction of motion.

Friction is a force that operates against motion when two objects are touching. So, option b is correct.

Friction is defined as the opposing force exerted by the surface when an object moves on it.

Here,

Friction is a resistive force that opposes relative motion between two surfaces. It is exerted by the surface on an object that is moving on it, which is in contact with the surface. So, frictional force is a contact force. It prevents sliding or rolling of an object on a surface in contact. It acts against the motion or the applied force. The object can move only if the applied force on the object overcomes the frictional force exerted by the surface. Frictional force is of various types.

Friction can also act on stationary object.

Friction causes wear and tear to the parts of machines.

Friction is known as resistive force because it always acts against the motion when there is a relative motion between surfaces.

Hence,

Friction is a force that operates against motion when two objects are touching. So, option b is correct.

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Answer:

B. Encoding

Explanation:

Encoding is the processing of information and input into memory.

The processing of information and other input into your memory is called encoding. Encoding is the input of information into the memory system. It involves labeling or coding sensory information and connecting new concepts to existing concepts. Encoding can occur through automatic processing or effortful processing.

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Answer: D. A glass pane

Explanation: Glass is a poor conductor of electricity. Aluminum, copper and silver are all good conductors of electricity.

A pane of glass can be used as an insulator against electric current because it is a poor conductor of heat.

Glass is made up of silica which is abundant in nature.

1 hour is 3600 seconds. In 2 hours, it would be 7200 seconds.  Divide the amount of miles by seconds. 100/7200=.01388..

We don't know anything about the direction Jack was traveling, so we can't determine his velocity.  The best we can do is work with his speed.

Speed = (distance covered) / (time to cover the distance)

Speed = (100 miles) / (2 hours)

Speed = 50 miles/hour

The question has specified a different unit, so we'll need to convert the unit of our answer.  

Let's multiply the answer by (1 hour / 3600 seconds).  The numerator and denominator of this fraction are both the same quantity, so the value of the fraction is ' 1 ', and multiplying the answer by it won't change the answer in any way except the unit.

Speed = (50 mi / hr) x (1 hr / 3600 sec)

Speed = (50mi · 1hr)  /  (hr · 3600sec)

Speed = 50 mi / 3600 sec

Speed = 0.01389 mi/sec

false 99.8% sure i looked it up so i believe thats it

The statement is false. For a fixed mass, gold, which is denser than aluminium, will have a smaller volume.

The statement that 1kg of gold will have seven times the volume of 1kg of aluminium is false. The volume of a material is derived from its mass and its density. Specifically, volume equals mass divided by density. The density of gold is about 19.3 g/cm³ while the density of aluminium is about 2.7 g/cm³. Hence, for a given mass, gold will have a smaller volume than aluminium. The intuitive reason for this is that gold is denser than aluminium - it has more mass packed into the same volume.

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Kinetic energy

A car engine changes chemical potential energy into the kinetic energy of the moving car​.