Answer:
Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength.
Explanation:
PLEASE ANSWER QUICKLY
Answer:
the third one
Explanation:because coal cause more pollition
Energy is the capacity to do work or
produce a change. Energy of position is
called potential energy. Energy of motion
is called kinetic energy.
Which situation best illustrates potential
energy being converted into kinetic
energy?
(1) a baseball landing on the ground
(2) a car coming around a corner
(3) turning off an electric lamp
(4) an apple falling from an apple tree
(5) a jogger running in a race
Answer:
4
Explanation:
Apple initially has Potential energy due to it's height and mass
as it falls this PE is converted to KE
An apple falling from an apple tree illustrates potential energy being converted into kinetic energy. So, the correct option is (D).
What is Potential and Kinetic Energy?Kinetic energy is a type of energy which is possessed by an object due to its motion while Potential energy is the type of energy possessed by an object due to its position or state.
While kinetic energy is relative to the position of other objects in its environment, potential energy is completely independent of its environment.
Kinetic energy can be transferred from one moving object to another while potential energy cannot be transferred. The formula of Kinetic energy is [tex]1/2 mv^2[/tex] while the formula of Potential energy is mgh where m is the mass, v is the velocity, h is the height of an object and g is the acceleration due to gravity. S.I. unit of both is Joules (J). In the given information, the apple which is on the tree is in rest mode i.e. potential energy falls from the tree, changing its motion i.e. kinetic energy.
Thus, an apple falling from an apple tree illustrates potential energy being converted into kinetic energy. So, the correct option is (D).
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8TH GRADE SCIENCE PLEASE HELPPP
Answer:
The two helicopters have the same kinetic energy, but a different GPE, or gravitational potential energy.
Explanation:
You are making photoelectric measurements on an electrode of an unknown metal. With zero potential difference applied by the battery, you shine various freqencies of light on the cathode. You detect a small photocurrent for light with wavelength up to 451 nm. What metal is the electrode made of
Since you detect a small photocurrent for light with wavelength up to 451 nm, the metal the electrode is made of is Sodium.
To solve the question, we need to know what work function is.
What is work function of a metal?This is the minimum energy at which an electron will be emitted from the surface of a metal.
Since a small photocurrent is detected when ligh of wavelength up to 451 nm is applied with a zero potential difference applied, this is the threshold wavelength which gives the work function of the metal.
So, work function Ф = hc/λ where
h = Planck's constant = 6.63 × 10⁻³⁴ Js, c = speed of light = 3 × 10⁸ m/s and λ = wavelength of light = 451 nm = 451 × 10⁻⁹ mSubstituting the values of the variables into the equation, we have
Ф = hc/λ
Ф = 6.63 × 10⁻³⁴ Js × 3 × 10⁸ m/s ÷ 451 × 10⁻⁹ m
Ф = 19.89 × 10⁻³⁴ × 10⁸ Jm ÷ 451 × 10⁻⁹ m
Ф = 0.0441 × 10⁻¹⁷ J
Ф = 4.41 × 10⁻¹⁹ J
Since 1 eV = 1.602 10⁻¹⁹ J,
Ф = 4.41 × 10⁻¹⁹ J × 1 eV/1.602 10⁻¹⁹ J
Ф = 2.753 eV
From tables, the metal with the work function closet to this value is Sodium.
So, the metal the electrode is made of is Sodium.
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All masses cannot be measured in kilogram, why ?
Answer:
We cannot measure all masses in kg, because there are very small quantities like 1gm nd even smaller, and this will not be an accurate measurement in Kg.
What do we call the bright, sphere-shaped region of stars that occupies the central few thousand light-years of the milky way galaxy?.
Answer: The galaxy's bulge
Explanation:
Examine the distance-time graph.
Which line represents travel at the fastest speed? Justify your answer.
Answer:
A
Explanation:
because it is accelerating and as the vehicle accelerates the speed increas
A 50.0g sample of C-14 has decayed leaving only 3.1g. How much time has elapsed since the original sample was weighed? The half life of C-14 is 5730 years
Answer: 17,000
Explanation: I got it right
a toy airplane takes off and flies for a distance of 34 meters at an angle of 26 degrees above the horizontal. what is its altitude when it has flown this distance?
Answer:
Explanation:
14.9m
The altitude when the airplane flies a distance of 34 m is equal to 14.9 m.
What is the distance?The distance of an object can be demonstrated as the total length traveled by an object. The distance can be defined as a scalar parameter as it has magnitude, not direction. The distance by an object is always positive (+ve), it can never be zero.
Given, the airplane traveled the distance, BC = 34m as shown in the attached diagram, below:
The angle of the path with horizontal, θ = 26°
From the right angle triangle ΔCBA, we can calculate the BC:
Sin θ = BC/AC
Sin 26° = x/34
x = sin 26° ×34
x = 0.438 × 34
x = 14.9 m
Therefore, the altitude when an airplane has flown this distance is 14.9 m.
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find the work done by the engine of a car which moves at an acceleration of 3 m / s2 for 8s. the mass of the car is 1400 kg, while the coefficient of fecundation of its wheels with the road is 0.03.
Explanation:
so that u multiple in this formula
Answer:
362.88 kJExplanation:
Given
a = 3 m/s²t = 8 sm = 1400 kgμ(k) = 0.03Finding Displacement
S = ut + 1/2at²S = 0 + 1/2(3)(8)²S = 32(3) = 96 mFinding Net Force
Applied Force (F) = ma = 1400 x 3 = 4200 NFriction Force (f) = μmg = 0.03 x 1400 x 10 = 420 NNet Force = F - f = 4200 - 420 = 3780 NWork Done
W = FS = 3780 N x 96 mW = 362880 JW = 362.88 kJA disk with radius of 0. 5 m is free to rotate around its center without friction. A string wrapped around the disk is pulled, as shown above, exerting a 2 n force tangent to the edge of the disk for 1 s. If the disk starts from rest, what is its angular speed after 1 s?.
For a disk with radius of 0. 5 m is free to rotate around its center without friction, its angular speed after 1 s is mathematically given as
w=1/(0.5M π^2)
What is its angular speed after 1 s?Generally, the equation for the Moment of inertia is mathematically given as
I=0.5mx^2
Where
radius = 0. 5 m
Mass=M
Force on edge=F=2N
Time =t
Hence, Torque
T=0.5*2=1.0Nm
Where
T=Ia
w=W0+at
Hence
W=1/I
In conclusion, angular speed after 1 s
I=0.5M π^2
w=1/(0.5M π^2)
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When the reflection of an object is seen in a flat mirror, the image is.
Answer:
the image is actually appearing behind the mirror, and not in the mirror.
Which formula can be used to solve problems related to the first law of thermodynamics? q = w u q = u – deltaw q = u w q = u – w
"Q = ΔU + W" is the equation is used to solve the questions related to "First law of thermodynamics".
What is the first law of thermodyanamics?"First law of thermodynamics" states that "energy" neither created nor destroyed, but it can transfer from "one form of energy" to "another form of energy".
This "First law of thermodynamics" is also called as "law of conversation of energy". The formula for "First law of thermodynamics" of a system is that "change in internal energy of a system" is same as the difference of "heat energy" flows across the " boundaries of a system" and the "work done" on the system.
ΔU = Q - W
Q = ΔU + W
Where, "ΔU" is "change in internal energy", "Q" is "heat transferred and "W" is "work done.
Hence "Q = ΔU + W" is the equation is used to solve the questions related to "First law of thermodynamics".
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Which space mission visited the moon several times?.
In straight line path, magnitude of velocity is equal to
Acceleration
Explanation:
The particle is moving in a straight line. That means there’s no change in the path of the particle in the entire trip. It is moving with constant acceleration, meaning the particle doesn’t change its acceleration at all. The acceleration direction is in the same direction of instantaneous velocity
Unpolarized light of intensity Io is incident on a stack of 7 polarizing filters, each with its axis rotated 17°cw with respect to the previous filter. Find the ratio between light intensity emerges from the last filter and unpolarized light of intensity Io. It/Io= _________
The ratio of the intensity between light intensity that emerges from the last filter and unpolarized light of intensity, I₀ is It/I₀ = 0.2925
To answer the question, we need to know what polarization of light is.
What is polarization of light?This is when the electric field vector of light is oscillating in one plane.
Now for light of intensity I' which is initially unpolarized, its intensity after polarization is I = 1/2I'.Also, for light initially polarized, its intensity after polarization is I"' = I"cos²Ф where Ф is the angle between the initial direction and the direction of polarization.Intensity of light through each polarized filterGiven that we have 7 polarizing filters, each rotated 17° cw with respect to the previous filter.
So, since the light is initially unpolarized,
The intensity through the first polarizing filter is I₁ = 1/2I₀ where I₀ is the initial intensity.The intensity through the second polarizing filter is I₂ = I₁cos²17°= 1/2I₀cos²17°The intensity through the third polarizing filter is I₃ = I₂cos²17° = 1/2I₀cos⁴17°The intensity through the fourth polarizing filter is I₄ = I₃cos²17° = 1/2I₀cos⁶17°The intensity through the fifth polarizing filter is I₅ = I₄cos²17° = 1/2I₀cos⁸17°The intensity through the sixth polarizing filter is I₆ = I₅cos²17° = 1/2I₀cos¹⁰17°The intensity through the seventh polarizing filter is I₇ = I₆cos²17° = 1/2I₀cos¹²17°.The ratio of the intensity between light intensity that emerges from the last filter and unpolarized light of intensitySince I₇ is the last intensity I₇ = It = 1/2I₀cos¹²17°.
So, It/I₀ = 1/2cos¹²17°
= 1/2(0.9563)¹²
= 1/2 × 0.5850
= 0.2925
So, the ratio of the intensity between light intensity that emerges from the last filter and unpolarized light of intensity, I₀ is It/I₀ = 0.2925
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Three examples of good hypotheticals
Answer:
here are some of my favorites
Explanation:
if the world was ending, what would you do?
if you had super powers. what would they be?
if we could go to the moon, would you?
Answer:
If Life was a human, how would you treat him/her?If death was a god would you praise him?And If wishes were dead, would you bring them back alive?Explanation:
{horrifically chuckles]
*Leaves the room*
Which sound wave has higher pitch
Can you also compare the loudness of both
Answer:
Below one has higher pitchLoudness is roughly the sameExplanation:
Pitch depends on frequencyThe below one has a higher frequency, hence it has a higher pitchThe loudness depends on the amplitudeThe amplitude here in the two is roughly the same as the height of the waves are similarWhich are thought to have formed farthest from the sun?.
A system is heated with 134 J of energy and, at the same time, the system expands, doing 89 J of work. What is the change in internal energy of the system, in Joules
The change in internal energy of the system after the heat is added and the system expands doing work to the surrounding is 45 J.
Change in internal energy of the system
The change in internal energy of the system is determined by applying the first law of thermodynamics as shown below;
ΔU = q - w
where;
ΔU is the change in the internal energyq is heat added to the systemw is work done to the surroundingsΔU = 134 J - 89 J
ΔU = 45 J
Thus, the change in internal energy of the system after the heat is added and the system expands doing work to the surrounding is 45 J.
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A go-cart is rolling down a hill at 15m/s. If it has 85J of kinetic energy. what is the mass of the go-cart?
0.76kg
0.87kg
5.67kg
0.18kg
What is the difference between synchronous and asynchronous?.
Answer:synchronous communications are scheduled, real-time interactions by phone, video, or in-person. Asynchronous communication happens on your own time and doesn't need scheduling.
Explanation:
Which element is more likely to give up electrons than to gain them during a reaction? A.fluorine b.boxygen c.carbon d.lithium
Answer:
Lithium
Explanation:
Elements that are metals are tend to lose electrons and become positively charged ions called Cations. Elements that are non metals tend to gain electron and become negatively charged ions called Anions.
How would the size of
parachute required on a space
probe to allow it to land safely
differ on:
a planet such as Venus
which has a thick
atmosphere.
Answer:
Explanation:
The atmosphere is too thin to slow the descent for a soft landing. Mars is almost a vacuum, it is the equivalent to Earth atmosphere around 125,000 feet. ... You do not want your lander to get entangled with the chute on landing, so you loose the chute right before you land.
a sound is first produced by making something BLANK the sound then travels through a BLANK to reach the ears, which are the parts of the body that allow for sounds to be heard
Answer:
vibrate, medium.
Explanation:
Edge, 2022.
What is the net force that acts on a 5 kg object accelerating at 2m/s
Answer:
10 N
Explanation:
I assume there is no friction and we are only worrying about the horizontal direction. If so we use the formula F=MA to get F= 2 * 5 = 10 N
A ray of light passing through centre of curvature of a concave mirror is incident on its reflecting surface. What is the angle of incidence and reflection of this ray of light?
Which describe the image formed by the convex
mirror? Check all that apply.
-real
-virtual
-inverted
-upright
-smaller
-larger
Answer:
- Virtual
- Upright
- Smaller
Explanation:
I just did it on Edg22 and I got it correct :D
Answer:
see the picture
Explanation:
An object is sliding down an inclined plane at constant velocity. If the coefficient of kinetic friction between the object and the plane is , what is the angle of the plane?
The angle of the plane will be 26.57°.Angle of plane is the angle of elevaton at which the body exciute motion on the inclined plane.
What is kinetic friction?A force that acts among sliding parts is referred to as kinetic friction. A body moving on the surface is subjected to a force that opposes its progressive motion.
Force on an object due to the gravitational force will be;
[tex]\rm F = mg[/tex]
For the inclined plane the balance forces will be ;
[tex]\rm mgsin \theta = \mum g cos \theta \\\\ \rm\mu = tan \theta \\\\ \theta = tan^{-1}\mu \\\\ \theta = tan^{-1}0.5 \\\\ \theta = 26.57^0[/tex]
Hence the angle of the plane will be 26.57°.
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What were two reasons that the Krystal Beslanowitch case was finally closed?
Answer:
1. Police Weren't Able To Find Any Real Leads
2. They Didn't Find Any Clues To The Killer Until 18 Years Later
Explanation:
It was unknown at the time, but it would go on to take 18 years for her killer to be arrested and tried for her death. The initial case went on from 1995 to 1997 but ended up closing when the police department was unable to find any real leads.