Look at the incomplete equation below. What does E k Represent?

Answer:

According to your question although you didn't include the options, it is obvious that when air pressure is acting on an object ,there is just as much air pressure pushing up as there is pushing down on the object,thereby creating a balanced for the object.

Magnitude of the force = 50N

Explanation:

Let one force be X

And the second force be Y

Both the forces are perpendicular, so α = 90°

The resultant R of the two forces = 100N

Angle between resultant and 1 force, α = 60°

We know,

R² = X² + Y² + 2XYcos 90

100² = X² + Y²

If X makes an angle of Φ = 60°

Then, tan Ф =  Y sin α / X + Y cos α

Putting the values we find,

tan 60 = Y/X

Y  = √3X

Putting Y = √3X in equation 1 we get,

(X)² + (√3X)² = 100 X 100

4X² = 100 X 100

X² = 2500

X = 50N

Therefore, magnitude of the force = 50N

Answer:

The boats are  934.65 feet apart

Explanation:

Given:

The angles of depression to the two boats are 42 degrees and 29 degrees

Height of the observation deck i =  1,353 feet

To Find:

How far apart are the boats (y )= ?

Solution:

Step 1 : Finding the value of x(Refer the figure attached)

We can use the tangent ratio to find the x value

[tex]tan(42^{\circ}) = \frac{1353}{x}[/tex]

[tex]x = \frac{1353}{tan(42^{\circ}) }[/tex]

x = 590.47 feet

Step 2 : Finding the value of  z (Refer the figure attached)

[tex]tan(29^{\circ}) = \frac{1353}{z }[/tex]

[tex]z = \frac{1353}{tan(29^{\circ})}[/tex]

z = 1525.12  feet

Step 3 : Finding the value of  y (Refer the figure attached)

y =  z -x

y = 1525.12 - 590.47

y = 934.65 feet

Thus the two boats are 934.65 feet apart

Answer:

Explanation:

Instantaneous speed is the speed of an object at a given point of time. While the speed we usually calculate is the average speed of the object throughout its journey, instantaneous speed can be determined by calculating the derivative of the average velocity of the object in question.

And the formula for average velocity is

V(avg)= Metre/ second, which is distance/time

Hence its derivative would be

dV(avg)=d(Distance)/d(time) which is the instantaneous speed of the object

Final answer:

Instantaneous speed is calculated by taking the absolute value of instantaneous velocity, which is the magnitude of velocity at a specific moment in time, without considering direction.

Explanation:

The calculation of instantaneous speed requires understanding that it is the magnitude of instantaneous velocity. Instantaneous velocity is a vector quantity that has both magnitude and direction, but when we are interested in the speed at an exact moment in time, we disregard the direction. To calculate the instantaneous speed, one typically takes the absolute value of the instantaneous velocity. For instance, if an object has an instantaneous velocity of -3.0 m/s, indicating motion towards the rear of a plane, its instantaneous speed is 3.0 m/s. Unlike average speed, which is calculated by dividing the total distance traveled by the total time taken, instantaneous speed is concerned solely with the rate of motion at a particular instant.

Instantaneous speed is a scalar quantity and, unlike velocity, does not include any directional information. The instantaneous speed can be determined from the instantaneous velocity by simply looking at its magnitude, without regard for its direction.

The answer is Kevin's weight may change between Planet X and Planet Y.

Explanation:

Answer:

the answer is A

Explanation:

Answer:

the action or process of moving or being moved

Explanation:

Answer:

Motion is simply the change of position of an object with time

Explanation:

Answer:

highest is correct word

Explanation:

Final answer:

Electronegativity increases at the top of the periodic table, with the highest values found in the upper right corner, corresponding to elements like fluorine.

Explanation:

Electronegativity is a measure of how strongly an atom attracts electrons when it forms a covalent bond. This tendency of an atom to attract electrons determines a lot in its chemical behavior. Electronegativity values, which can range from about 0.7 for elements like Francium (Fr) up to 4.0 for Fluorine (F), show a clear trend in the periodic table. They generally increase from left to right across the periodic table and are higher at the top of the periodic table. The elements with the highest electronegativity are found in the upper right corner of the periodic table, such as the nonmetals oxygen and fluorine, while those with low electronegativities are found in the lower left corner, such as the alkali metals.

Answer:

sucking in air through the turbine.

Explanation:

When an airplane turbine operates, it sucks air through it, compresses the air, causes its pressure to increase in the same way as its temperature and ejects it at high speed through the nozzle-shaped output, creating a high output speed and push force capable of moving the plane horizontally.

Vehicles of the fire department are equipped with water pumps of high pressure, in such a way that, when operating, send a flow of water with high pressure and speed through the hose, this force output of the water is sometimes much greater than the force with which the fireman holds the hose, and hence the difficulty to maneuver the hose.

Now when the fireman points the hose with the water at high pressure and speed coming out of it, into a wall close enough. The Fireman will experience newton's third law in all its splendor, which says that every force of action leads to a reaction, so that the reaction could hurt the fireman operating the hose.

Answer:

Average acceleration =-2.53m/s^2

Displacement s = 4.2m

Explanation:

Answer:

a. Microwaves—3 and infrared waves—1

Explanation:

Microwaves and infrared waves are both part of the electromagnetic spectrum, but they have different frequency and wavelength.

In particular:

- Microwaves are long-wavelength electromagnetic waves, with wavelength between 1 mm and 1 m. Their wavelength is longer than visible light

- Infrared waves are also long-wavelength electromagnetic waves, but their wavelength is shorter than microwaves: between 700 nm and 1 mm. Their wavelength is also longer than visible light.

The two types of waves are also used for different purposes. In particular:

- Infrared waves are emitted by any hot object, and their intensity depends on the temperature of the object. Therefore, they are used in astronomy to show the heat released by astronomical objects (option 1)

- Microwaves are used to study the Cosmic Microwave Background (CMB). This is electromagnetic radiation that permeates the whole universe, and its wavelength depends inversely on the local temperature. Therefore, areas with longer wavelength have lower temperature, and viceversa. Therefore, microwaves are used to measure temperature differences in space (option 3).

The mass of magnesium oxide must be 40 grams

Explanation:

The law of conservation of mass states that the total mass of the reactant in a chemical reaction must be equal to the total mass of the products after the reaction has completed.

In this problem, we have:

Reactants:

Magnesium metal (mass: 24 grams)

Oxygen gas (mass: 16 grams)

Products:

Magnesium oxide (mass: ?)

According to the law of conservation of mass, the mass of the magnesium oxide must be equal to the sum of the mass of the magnesium metal and the oxygen gass. Therefore:

Mass (magnesium oxide) = 24 g + 16 g = 40 g

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The distance travelled by the Hogwarts express is 420 miles. So, they are 420 miles apart  by the Hogwarts express .

Speed is characterized as the rate at which an object's position changes in any direction. The distance travelled in relation to the time it took to travel that distance is how speed is defined.

Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.

Speed of the Hogwarts express is = 120 mi/hr.

Time interval the Hogwarts moves = 3.5 hours

Hence, The distance travelled by the Hogwarts express is = speed of the Hogwarts express × time interval the Hogwarts moves

= 120 mi/hr × 3.5 hr

= 420 miles.

So, they are 420 miles apart  by the Hogwarts express .

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The distance between platform 9 and 3/4 and Hogwarts is 420 miles.

To determine the distance between platform 9 and 3/4 and Hogwarts, we can use the formula distance = speed × time.

Given that the Hogwarts Express is moving at a speed of 120 mi/hr and takes 3.5 hours to reach Hogwarts, we can calculate the distance as follows: distance = 120 mi/hr × 3.5 hours = 420 miles.

Therefore, the distance between platform 9 and 3/4 and Hogwarts is 420 miles.

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Answer:

700J

Explanation:

Answer:

Power = 30 [watts]

Explanation:

Initia data:

F = force = 30[N]

d = displacement = 2 [m]

By definition we know that work is equal to the product of force by the distance displaced

Therefore:

W = F * d = 30 * 2

W = 60 [J]

And power is defined as the amount of work done in a given time interval

time = t = 2 [sec]

Power = W / t

Power = 60 / 2

Power = 30 [W]

Answer: 2.4 m/s

Explanation:use KE= 1/2 mv²

Derive to find v:

v = √ 2KE / m

= √ 2 ( 9 J ) / 3 kg

= 2.4 m/s

Answer:

The average speed is 0.8 meters per second.

Explanation:

Answer:

YES THERE WILL BE A DIFFERENCE

Explanation:

THE THERMOMETER WHICH IS KEPT UNDER SUNLIGHT WILL BREAK DUE TO THE HEAT OF THE SUN

AND THE ONE KEPT UNDER SHADE WILL BE SAFE.

Final answer:

Yes, there will likely be a difference in temperature between a thermometer placed in direct sunlight and one placed in the shade due to the energy carried by sunlight that converts to heat when absorbed.

Explanation:

If a student places one thermometer in direct sunlight and another in the shade and records the temperatures over a period of one week, yes, there will likely be a difference in temperature readings between the two locations. Direct sunlight warms the surface it strikes more than an area in the shade does. This is due to the fact that sunlight carries energy which converts to heat when it is absorbed by objects, including thermometers. If the thermometer in the shade is shielded from this direct infusion of solar energy, it will generally record a lower temperature.

Several experiments suggested, such as shielding a thermometer with aluminum foil, wrapping it with a handkerchief soaked in nail polish remover, or simply measuring the air temperature in a sunny spot, all showcase the effects of sunlight on temperature readings. It is important to use an appropriate laboratory thermometer that can handle specific temperature ranges to avoid breakage and ensure accurate results. Additionally, when conducting the experiment, it is vital to ensure that the thermometer is upright to avoid incorrect readings.

Answer: The diameter of the circular path is 2.96m

Explanation: centripetal acceleration = tangential speed^2 / radius of the circular path.

Centripetal acceleration = 2.7m/s^2

Tangential speed = 2.0m/s

Radius = 2.0^2 / 2.7 = 4/2.7

= 1.48m

Diameter = radius*2

= 1.48*2 = 2.96m.

4) Potential energy: 784 J

5) Potential energy: 392 J

Explanation:

4)

The potential energy of an object is the energy possessed by the object due to its position in the gravitational field. It is given by

[tex]PE=mgh[/tex]

where

m is the mass of the object

g is the acceleration of gravity

h is the height of the object from the ground

Here, for the ball sitting on top of the building, we have:

m = 2 kg (mass)

[tex]g=9.8 m/s^2[/tex] (acceleration of gravity)

h = 40 m (height of the builiding)

So, the potential energy is

[tex]PE=(2)(9.8)(40)=784 J[/tex]

5)

As the ball is half way through the fall, the height of the ball is

h = 20 m

The potential energy of the ball now is

[tex]PE = mgh[/tex]

where

m = 2 kg is the mass  of the ball

[tex]g=9.8 m/s^2[/tex] is  the acceleration of gravity

Therefore, the potential energy now is

[tex]PE=(2)(9.8)(20)=392 J[/tex]

And we see that the potential energy has halved: this is because part of the potential energy, during the fall, has been converted into kinetic energy, increasing the speed of the ball (which is in fact accelerating).

A. 0 N is the net force acting on the box

Explanation:

Its is called intertidal zone

Explanation:

The earth rotation and the moon's pull of gravity causes the tides to rise and fall.High tides occur when the water advances to the furthers point of a shoreline where as low tides happen when the water recedes to the lowest point of the shoreline.Some kinds of animal and plants survive in the ecosystem present between the area of high tides and low tides refered to as the intertidal zone.This area is sometimes covered or uncovered by ocean waters.

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Answer:

The correct answer is D. wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

Explanation:

To calculate the height of the hill, use the formula h = GPE/Weight with the provided gravitational potential energy (10,500 J) and weight (539 N) of the object. The height equals the GPE divided by the weight, which, upon calculation, gives the height of the hill in meters.

The student is asking how to calculate the height of the hill, given the gravitational potential energy (GPE) and the weight of an object. In physics, the formula to calculate GPE is GPE = mgh, where m is the mass of the object, g is the acceleration due to gravity (approximately 9.8 m/s2 on Earth or 10 m/s2 for simplified calculations), and h is the height.

To find the height, one can rearrange the GPE formula to solve for h, which gives us h = GPE/(mg). The weight of an object is the force due to gravity acting on it, which can be calculated by multiplying the mass by the acceleration due to gravity (Weight = mg). Given that the weight (Weight) of the object is known, we can simplify the formula for height to h = GPE/Weight.

Using the information provided by the student, the GPE is 10,500 J, and the weight is 539 N. Substituting these values into our height formula gives us h = 10,500 J / 539 N, which results in an answer after calculation.

Let's calculate the height:

GPE = 10,500 J

Weight = 539 N

Height h = GPE / Weight = 10,500 J / 539 N

=19.48

Answer:

We know the information about atomic size, energy, electronic configuration etc. of atom from the periodic table.    

Explanation:

Answer:

Velocity of the passenger = 78.8[km/h]

Explanation:

In order to solve this problem, we must observe the train from a distant point of the train. In this way we can observe that the train moves at 80[km/h] relative to the ground.

In such a way that the passenger moves in a direction contrary to the movement of the train.

[tex]v_{pass}=80-1.2\\ v_{pass}=78.8[km/h][/tex]

The Observer located outside the train will see how the passenger moves away at 78.8 [km / h] and not at 80[km/h] which is the speed of the train.

Answer:

The boy's momentum = 80kgm/s

Explanation:

Momentum (P) =mass x velocity

Where, velocity(speed) =2m/s

Mass of the boy=40Kg

Momentum (P)=(40kg) x (2m/s) = 80kgm/s.

Answer: Conduction

Explanation:

The atoms in the solid move together and create heat

Answer:

conduction

Explanation:

It was right on my quiz please mark brainliest

Electronegativity is the ability of atoms to attract electrons in chemical bonds. It is an important concept in predicting bond types and molecular properties.

The ability of atoms to attract electrons in chemical bonds is called electronegativity. Electronegativity is a measure of an atom's tendency to attract a shared pair of electrons towards itself in a covalent bond. It is influenced by factors such as the number of protons in the nucleus and the distance between the nucleus and the outermost electrons.

For example, in a molecule of water (H2O), oxygen (O) has a higher electronegativity than hydrogen (H), resulting in a polar covalent bond where oxygen attracts the shared pair of electrons more strongly.

Electronegativity is an important concept in predicting the types of chemical bonds (such as ionic or covalent) and the polarity of molecules, which in turn influences their physical and chemical properties.

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She can climb 0.92 m without losing weight.

Explanation:

Gravitational potential energy is the energy consisting of the product of mass, gravity and height.

1 cal = 4184 J

140 cal = 585760 J

Energy = 585760 J,  m = 65.0 kg = 65000 g,   Efficiency = 20 %

                                 GPE = mgh

where m represents the mass

          g represents the gravity,

           h represents the height.

                             585760 = 65000 [tex]\times[/tex] 9.8 [tex]\times[/tex] h

                                        h = 0.92 m.