Carol tries to push a bookshelf across the room. As much as she tries, she can not get the bookshelf to move. Which statement best describes why the
bookshelf is not moving?
O
A Carol did not apply enough force to the bookshelf and so the forces are unbalanced.
B. Carol did not apply enough force to accelarate the bookshelf and so the forces are still balanced.
0
C. Carol applied too much force to the bookshelf and now the forces on the bookshelf are balanced
D. Carol applied too much force to the bookshelf and now the forces on the bookshelf are unbalanced

Answer:

idrk im jus here for the points[tex]\lim_{n \to \infty} a_n \lim_{n \to \infty} a_n \lim_{n \to \infty} a_n \lim_{n \to \infty} a_n \lim_{n \to \infty} a_n \lim_{n \to \infty} a_n[/tex]∈ω≠≠

Explanation:

Answer:

1. The type of interference happening when intersecting light waves subtract from each other to create dark spots is known as destructive interference

Destructive interference happens when the positive displacement or crest of one wave is cancelled by the negative displacement, or through of another wave of the same frequency resulting in a wave with lower amplitude

The letter on the diagram that shows destructive interference is the letter "c"

2. When particles pass translate through a key hole, they do not interfere with each. Therefore, when light is considered as a stream of particles, when it passes through a keyhole, there will be no  interference, and the light will particles will not interact with other light particles such that the pattern formed on on a wall on the other where the particles impinge on will be the shape of the single slit or keyhole

3. Three behaviors of light that support the theory that light travels in waves includes;

a) Refraction

b) Interference

c) Diffraction

Refraction

Refraction describes the change in velocity of light when it travels from one medium to another of different density, in which the light changes its speed

Interference

Interference is the superposition of two or more waves with the addition of the wave displacements resulting in a wave of larger or lesser amplitude than each of the individual waves

Diffraction

Diffraction is defined as the tendency of light to bend or spread when it goes past an object placed in its path by passing around the objects edge

4. The properties of a blackbody radiator includes;

1) A blackbody radiator absorbs all electromagnetic radiation incident on it

2) A blackbody radiator is capable of emitting black-body radiation

3) The peak of the emitted radiation depends on the blackbody temperature

4) The length of the wavelength of the peak radiation is inversely proportional to the temperature of the blackbody

5) The blackbody has zero coefficient of reflection or transmission and therefore, it does not reflect incident heat or light which makes it black

An example of a blackbody radiator is a burglar alarm that flashes light when there is an incident but cannot be ordinarily seen because of its dark color which is meant to absorb all incoming light

Explanation:

Wave interference is the phenomenon which describes the effect of the coming together or superposition of two or more waves to result in a wave displacement at a given point that is either reinforced (larger), cancelled (lower) amplitudes or the waves may have their original amplitudes when there is no interference

The wave displacement for the waves coming from the same source are taken as vectors from which the combination is calculated by using vector addition.

Answer:

The type of interference happening when intersecting light waves subtract from each other to create dark spots is called destructive interference. The letter "C" on the diagram shows this phenomenon.

If light were made of a stream of particles, it would behave by traveling in straight lines when passing through a slit or a keyhole. The particles would not spread out or bend around the edges like waves do.

Three behaviors of light that support the theory that light travels in waves are:

Reflection: Light bounces off a surface, like a mirror, following the law of reflection.

Refraction: Light bends when it passes through different mediums, like water or glass.

Diffraction: Light waves spread out and bend around obstacles, like when it passes through a narrow slit.

Characteristics of a blackbody radiator include:

It absorbs all wavelengths of light that fall on it.

It emits radiation at all wavelengths according to its temperature.

An example of a blackbody radiator is a heated metal object that glows when it reaches high temperatures, such as a red-hot iron rod.

Answer:

A

Explanation:

Answer:

I beleive B because its on land and the tecnotic plates are moving opposite directions pulling the ground into a tear like hole

Explanation:

what happen when you take two sides of something and pull opposite directions right it tears the same will happen to the groung.

Answer:

That's because cooling your body via sweating relies on a principle of physics called "heat of vaporization." It takes energy to evaporate sweat off of your skin, and that energy is heat. As your excess body heat is used to convert beads of sweat into vapor, you start to cool down.

[tex]E_c = \dfrac{mv^2}{2}[/tex]

[tex]E_c = \dfrac{25\cdot (5^2)}{2}[/tex]

[tex]E_c = 312.5 \text{ J}[/tex]

Answer:

A. -30 N

Explanation:

not sure but if the box isn't moving then the force opposite of Polly would be equal to the force she's exerting.

Answer:

-30 N....(A)

Explanation:

hope this helps, the person above me is also correct

Explanation:

yddzddydiiydiryxydiydyfiidydydydyyidydydiyidd

Answer:

Q = 1086.75 [J]

Explanation:

We must use the following equation of thermal energy, which relates the specific heat to the mass and to the change in temperature.

[tex]Q=m*C_{p}*(T_{final}-T_{initial})\\[/tex]

Where:

m = mass = 15.75 [g]

Cp = specific heat = 0.46 [J/g*C]

Tfinal = final temperature = 175 [°C]

Tinitial = initial temperature = 25 [°C]

Now replacing:

[tex]Q=15.75*0.46*(175-25)\\\\Q= 1086.75[J]\\[/tex]

Answer:

474 miles

Explanation:

63.2 x 7.5 = 474

Answer:

2,336,000

800,000 × 0.08 = 64,000

800,000 + (64,000×24)

Explanation:

KE = mv2 b. Suppose Karl uses a different puck with. = (85.0 kg)(8.5 m/s) half the mass ... How will. = 3.1X103 J the kinetic energy and work differ from KE; + PE; = KE; + PE those in ... If the puck has half the mass, it still .

Answer:

3431.875 J or 3.432 kJ

Explanation:

Kinetic energy can be found using the equation m/2*v^2.

We know m and v and we can plug in those values to get the answer.

95/2 times 8.5^2 = 3431.875 J or 3.432 kJ.

Answer:

The image behind the mirror is called a virtual image because it cannot be projected onto a screen—the rays only appear to originate from a common point behind the mirror. If you walk behind the mirror, you cannot see the image, because the rays do not go there

Answer:

i dont think its possible without a picture

Explanation:

Answer:

The answer is 7.5 M/s

Explanation:

The acceleration is not given so you should divide the mass by the force to acheive your answer :)

Answer: false

Explanation:

the more active you are, the more calories you are burning. consuming less calories is not ideal, you need to eat more since you are burning more than normal.

Answer:False

Explanation:The more active you are, the more calories you burn. Calories are a form of energy and you need to regain that energy by eating more calories

Answer:

A. In a closed system, the potential energy at the bottom is equal to the kinetic energy at the top.

Explanation:

According to the law of conservation of energy, energy is neither created nor destroyed but transformed from one form to another.

Based on the premise of the law of conservation of energy, both kinetic energy and potential energy are equal at the top and bottom in the system.

This way energy is conserved.

Answer:

Ally has a harder time

ally takes more time

juan is quick

juan is more experienced

if none of those are awnser choices what are the awnser choices?

Explanation:

Answer:

Air condenses and rises up

Answer:

A. overweight

Explanation:

Answer:

c

Explanation:

since of his lack of growing his body dont know what to do with the needed fat so while he's still growing its in his tummy waiting

Answer:

option c

Explanation:

6420/55

116.7

approximately 117

Answer:

W= m*g

5.4=9.8*m

mass = 0.55

Answer:

32.32857

Explanation:

Searched on the web

Answer:

:)

Explanation:

Answer:

acceleration of 3ms2

Explanation:

we can calculate the net force on the bowling ball from the above equation. Therefore, 30N of force is required to accelerate the bowling ball down the alleyway at a rate of 3ms2

Answer:

k  = 51.09 N/m

Explanation:

Given,

mass, m₁ = 0.3 Kg

length of spring, x₁ = 0.27 m

Mass, m₂ = 2.80 Kg

Length of spring, x₂ = 0.750

We know that

Restoring force, F = k x

Gravitation force, F = m g

Now,

m₁ g = k x₁ ......(1)

And

m₂ g = k x₂   .......(2)

where k is spring constant

Subtracting equation (2)- (1)

(m₂-m₁)g = k(x₂-x₁)

(2.8-0.3) x 9.81 = k (0.75 - 0.27)

24.525 = k x 0.48

k  = 51.09 N/m

Hence, spring constant is 51.09 N/m.

Answer:

sodium chloride

Explanation:

Answer:

velocity = 540m/s²

Explanation:

100cm = 1m

20cm= (20/100)m = 0.2m

velocity = 2700×0.2 = 540m/s²

Answer:

468750 J

Explanation:

Kinetic energy = (1/2) (mass)(velocity)^2

The kinetic energy of the car with a mass of 1.5 × 10³ kg running with a speed of 25 m/s is 468750 J  .

Kinetic energy of an object is a form of energy generated by virtue of the motion of the object. Kinetic energy is dependent on the mass and velocity of the body.

When a body starts to move its potential energy starts to convert to kinetic energy and the kinetic energy will be maximum at the highest speed. When the object slow down and pause in a position it gains potential energy again.

The kinetic energy KE = 1/2 mv²

Given mass = 0.9 Kg

velocity = 4 m/s.

KE = 1/2 0.9 Kg × 4² m/s

    = 7.5 J

Therefore, the kinetic energy of the car is 7.5 J.

To find more on kinetic energy, refer here:

http://brainly.com/question/26472013

#SPJ2

Plugging in for the Earth's mass and for G, we have 11.2 km/s for the escape velocity for an object launched from the Earth's surface. This is about 25,000 miles per hour