Which of the following is a compound?
A. Na+
B. NaCl
C. Na
D. NaCl + Ag2O → AgCl + Na2O
A. Na+ : cation
B. NaCl : compound
C. Na : element
D. NaCl + Ag2O → AgCl + Na2O : chemical reaction
Random question? How many grains of sand are there in the entire world?
Answer:
five hundred quadrillion
Answer:
there is roughly 7.5 x 10^18 grains of sand, or even seven quintillion grains of sand on earth
what state of matter is the sun
Answer:
the sun is plasma
Explanation:
it is a hot ball of gas made out of oxygen
Answer:
Plasma
Explanation:
All stars are made of gas, however the sun is so hot that most of that gas is plasma
1 The photoelectric effect is good evidence for __________.
A both wave and particle nature, because it blends photons with electrons
B the wave nature of EM radiation, because it shows how wave amplitude is proportional to quanta of energy referred to as photons
C the particle nature of EM radiation, because it shows how frequency is proportional to quanta of energy referred to as photons
D neither the wave nor the particle nature of light, because results vary based on the frequency of light used
2 How can you calculate the momentum of a photon?
A the product of 2, pi, and the photon's radius
B the product of mass and velocity
C a photon doesn't have momentum because it has no mass
D Planck's constant divided by the photon's wavelength
3 Interference and diffraction patterns are good evidence for __________.
A the particle nature of EM radiation
B neither the particle nature nor the wave nature of EM radiation
C both the particle nature and wave nature of EM radiation
D the wave nature of EM radiation
4 The ultraviolet catastrophe is good evidence for the:(1 point)
A particle nature of quanta
B wave nature of quanta
C neither the wave nor the particle nature of quanta
D both particle and wave nature of quanta
Answer:
1. the particle nature of EM radiation, because it shows how frequency is proportional to quanta of energy referred to as photons
2. Planck's constant divided by the photon's wavelength
3. the wave nature of EM radiation
4. particle nature of quanta
Read the chapter next time bozo
Explanation:
The photoelectric effect is good evidence for
The particle nature of EM radiation, because it shows how frequency is proportional to quanta of energy referred to as photons.Planck's constant divided by the photon's wavelength.The wave nature of EM radiation.Particle nature of quanta.What are two nature of light?Light has two different nature:
Wave nature Particle natureWhat do you mean by particle nature of light?Particle nature of light states that light consists of particles called 'Photons'.Photons are considered as bunch of energy , which represents Electromagnetic radiation.What is wave nature of light?Wave nature of light states that light behaves as an electromagnetic wave.
What is photoelectric effect?The phenomenon of emission of electrons from the surface of the metal when the light of suitable frequency falls on it.
What is Plank's constant?The physical constant that relates the energy carried by a single photon to its corresponding frequency.It is denoted by 'h'.Its value is 6.62607015 × 10-34 m2 kg / s.Thus , we can say that, The photoelectric effect is good evidence for
The particle nature of EM radiation, because it shows how frequency is proportional to quanta of energy referred to as photons.Planck's constant divided by the photon's wavelength.The wave nature of EM radiation.Particle nature of quanta.Learn more about Photoelectric effect here -
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What is the density of a cube of iron that is 3 inches on each side and has a mass of 13g?
Answer:
[tex]\boxed {\tt 0.481481481 \ g/in^3}[/tex]
Explanation:
Density can be found by dividing the mass by the volume.
[tex]d=\frac{m}{v}[/tex]
The mass is 13 grams. Let's calculate the volume. This is a cube, so the volume formula is:
v=s³The side length (s) is 3 inches v=(3 in)³= 3 in * 3 in * 3in = 27 in³The volume is 27 cubic inches.
[tex]m= 13 \ g\\v= 27 \ in^3[/tex]
Substitute the values into the formula.
[tex]d=\frac{13 \ g}{27 \ in^3}[/tex]
Divide.
[tex]d=0.481481481 \ g/in^3[/tex]
The density is 0.481481481 grams per cubic inch.
The diagram shows two forces acting on an object. The forces have magnitudes F1 = 2.7 N and F2 = 0.80 N.
What third force will cause the object to be in equilibrium?
O2.8 Nat 163° counterclockwise from F1
O 1.8 N at 163° counterclockwise fromF1
O2.8 N at 123° counterclockwise from F1
O 3.0 N at 147° counterclockwise from F1
Answer:
2.8 [N] at 163° counterclockwise from F1
Explanation:
To solve this problem we must perform a summation of forces on the X & y axes, these summations of forces must be equal to zero.
ΣFx = 0
- F1 + Fx = 0
- 2.7 + Fx = 0
Fx = 2.7 [N]
ΣFy = 0
- Fy + 0.8 = 0
Fy = 0.8 [N]
Now using the Pythagorean theorem we can calculate the magnitude of the force.
F = √(2.7)² + (0.8)²
F = 2.81 [N]
Now we can determine the angle using the tangent of the angle.
tan (α) = F2/F1
α = tan^-1 (0.8/2.7)
α = 16.5°
The force is in the fourth quadrant, so we need to subtract 180° from the calculated angle.
180 - 16.5 = 163.5°
Therefore the force is going to the 2.8 [N] at 163° counterclockwise from F1
Two identical spheres are attached to opposite ends of a thin rod of negligible mass, as shown in the figure. The
spheres-rod system is thrown straight upward and is rotating counterclockwise as it moves through the air. Which of
the following is correct about the angular momentum of the spheres-rod system while it is in the air? What is a valid
justification?
(A) The angular momentum remains constant because there is never a net torque acting on the system.
(B)
The angular momentum remains constant because there is a changing net torque acting on the system that
averages to zero over time.
(C) The angular momentum constantly decreases because there is a constant net torque acting on the system.
(D) The angular momentum constantly increases because there is a constant net torque acting on the system.
The angular momentum remains constant because there is a changing net torque acting on the system that averages to zero over time.
What is principle of conservation of angular momentum?This principle states that If the external torque acting on a system is zero, then the angular momentum of the system is constant.
When the spheres-rod system is thrown straight upward and it rotates counterclockwise, the net torque acting on the system averages to zero over time.
Thus, we can conclude that, the angular momentum remains constant because there is a changing net torque acting on the system that averages to zero over time.
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At one point in the rescue operation, breakdown vehicle A is exerting a force of 4000 N and breakdown vehicle B is exerting a force of 2000 N.
(i) Using a scale of 1 cm = 500 N, make a scale drawing to show the resultant force on the truck.
Why is an absorption spectrum especially useful for astronomers?.
Answer:
It has dark lines in it that allow astronomers to determine what elements are in the star. red-shifted (shifted toward the red end of the light spectrum).
Explanation:
Analyze Is it possible for an
object that has a constant
negative acceleration to
change the direction in which
it is moving? Explain why or
why not.
Answer:
Yes it is possible. An object can have a negative acceleration (deceleration) and change its direction. Take for example a car decelerating from 5 m/s to a speed of 1 m/s and then taking a right turn. It changed its direction while still maintaining a negative acceleration.
A friend tells you that a different size of ball bearing might make your skateboard move faster. You try three different sizes and keep track of the time to roll 50 feet. You write down exactly how you tried the ball bearings on your skateboard and make a chart of the time it took to roll the 50 feet for each size ball bearing.
Answer:
Experimental variablr
Explanation:
I just did it:)
A long wire carrying a 5.5 A current perpendicular to the xy-plane intersects the x-axis at x=−2.0cm . A second, parallel wire carrying a 2.5 A current intersects the x-axis at x=+2.0cm . Part A At what point on the x-axis is the magnetic field zero if the two currents are in the same direction? Express your answer in centimeters. x x = nothing cm SubmitRequest Answer Part B At what point on the x-axis is the magnetic field zero if the two currents are in opposite directions? Express your answer in centimeters. x x = nothing cm SubmitRequest Answer Provide Feedback Next
Answer:
a
The point on the x-axis where the magnetic field will be zero is [tex] d = 2.8 \ cm [/tex]
b
The point on the x-axis where the magnetic field will be zero is [tex]Z = 5.333 \ cm [/tex]Explanation:
From the question we are told that
The first current is [tex]I_1 = 5.5 \ A[/tex]
The point of x- axis intersection is [tex]x = -2.0 \ cm[/tex]
The second current is [tex]I_2 = 2.5 \ A[/tex]
The point of intersection of the x-axis is [tex]x = 2 .0 \ cm[/tex]
Generally given that the current of the two wires are same direction it means that the magnetic field in -between the wires will cancel out giving zero
So
[tex]B_1 - B_2 = 0[/tex]
=> [tex]B_1 = B_2 [/tex]
=> [tex]\frac{\mu_o * I_1 }{2 * \pi * d } = \frac{\mu_o * I_2 }{2 * \pi * (4 -d) }[/tex]
Here d is the of one wire to the point where the magnetic field is 0
and given that the total distance in-between the wire is D = 2 = 2 = 4
Hence the distance of the other wire to the point where magnetic field is zero is (4 - d)
So
[tex]\frac{5.5}{ d} = \frac{2.5}{4-d}[/tex]
=> [tex] 8d = 22 [/tex]
=> [tex] d = 2.8 \ cm [/tex]
So the point on the x-axis where the magnetic field will be zero is [tex] d = 2.8 [/tex]
Generally given that the current of the two wires are opposition direction it means that the magnetic field at a position which is not in-between the wire will be zero
Let that position be k
Let the distance from the middle of both wires to k be Z
So
[tex]\frac{\mu_o * I_1 }{2 * \pi * ( 2 + Z) } = \frac{\mu_o * I_2 }{2 * \pi * (Z -2) }[/tex]
=> [tex]5.5 Z - 11 = 5+ 2.5 Z[/tex]
=> [tex]3Z = 16[/tex]
=> [tex]Z = 5.333\ cm[/tex]
how can I determine the pressure of a certain place. I mean formula of pressure
Answer:
Pressure and force are related, and so you can calculate one if you know the other by using the physics equation, P = F/A. Because pressure is force divided by area, its meter-kilogram-second (MKS) units are newtons per square meter, or N/m2.
lighting is to thunder as lunch
Answer:
is to meal
Explanation:
plz mark brainlest
do you now how hot suns core is
Answer:
Core: the temperature at the very center of the Sun is about 27 million degrees Farenheit (F). The temperature cools down through the radiative and convective layers that make up the Sun's core.
Explanation:
it is about 27 million degrees Fahrenheit
good luck :D
Undigested and unabsorbed materials from the
small intestine pass into the
a. gall bladder
b. stomach
c. colon
d. liver
Why did they compare the DNA to words in a language?
Answer:
to go to get a bike
Explanation:
Which is a characteristic of centripetal acceleration?
A. It is directed outward from the center of a circle.
B. It is directed inward, toward the center of a circle
C. It results in an object moving faster.
D. It results in an object moving slower.
Answer: The Answer is B. It is directed inward, toward the center of a circle.
Explanation:
explain why the two methods are likely to give different results?
Explanation:
Averaging uses estimation to find the answer and is likely close to the answer, but not exact, especially if it's decimals. Calculating gives exact answers, which gives a difference in the two answers or results.
If you pull up on a bucket with a tension force of 15 N and the bucket has a weight of 15 N, what is the net force acting on the bucket?
15 Nup
15 N down
30 N up
O N
Answer:
F = 0 [N]
Explanation:
To solve this problem we must perform a summation of forces in the direction of the vertical axis. Where the positive force is that of the tension of the upward force, while the force exerted by the weight is directed downward with a negative sign.
ΣF = 0
15 - 15 + F = 0
F = 0 [N]
Cecily is inflating one of her bicycle tyres with the pump below. When she pushes the plunger down, does the volume of the gas in the
cylinder increase, decrease or stay the same?
Answer:
See the explanation below
Explanation:
This problem can be better understood graphically, so in the attached image we will use a diagram of a positive displacement air pump.
We can see that when she pushes the plunger, we see that the volume decreases.
What is the representation of the momentum vector?
1. a number
2. a dot
3. a straight line
4. an arrow **
an arrow
Explanation:
momentum is a vector quantity it has both magnitude and direction.
a vector diagram can be used to represent this principle of momentum conservation such as diagram uses an arrow to represent the magnitude and direction of the momentum vector for the individual objects before the collision and combined after the collision
The best representation of momentum vector is ; ( 4 ) An arrow
A momentum is a vector quantity with both magnitude and direction and it simply represents a mass ( object ) in motion. momentum is calculated as ;
P = mV . where m = mass of object , v = velocity of object .
An arrow is a good representation of momentum vector because it has both mass and velocity when fired from bow.
Hence we can conclude that the best representation of momentum vector is an arrow.
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Two angles are complementary. The first angle measures 39º and the second angle
is 3y. What is the value of y?
O 51°
O 470
O 11°
O 17°
Answer:
11
Explanation:
i've been in k12 and i got an a on this anser
How much work is done if you push a couch 10m across the floor with 5N of force?
Work = Force * Distance = 5N * 10m = 50Nm
Force: 5NDistance: 10mHope it helps!
An automobile manufacturer claims that its
product will travel 0.4 km in 24 s, starting
from rest.
What is the magnitude of the constant acceleration required to do this?
Answer:
uncle
Explanation:why not
During his recent skydiving adventure, Luke Skyfaller has reached a terminal speed of 9.8 m/s as he approach the ground with his parachute. During an attempt to snap one last photo with his camera Luke fumbled it from a height of 52.8 m above the ground determine the speed with which the camera hits the ground.
Answer:
The correct solution is "33.62 m/s".
Explanation:
The given values are:
Speed
u = 9.8 m/s
Height
s = 52.8 m
As we know,
⇒ [tex]v^2 = u^2 + 2as[/tex]
On putting the estimated values, we get
⇒ [tex]=(9.8)^2+2\times 9.8\times 52.8[/tex]
⇒ [tex]=96.04+1034.88[/tex]
⇒ [tex]=\sqrt{1130.92}[/tex]
⇒ [tex]=33.62 \ m/s[/tex]
What kind of question can be asked upon reflection.
Answer:
Explanation:
When dealing with optics, there is an incident wave, a reflected wave, and a transmitted wave. An incident wave is the initial wave coming out from the source, like a flashlight.
Then the reflected wave is created when the incident wave encounters an interface like a piece of glass. The reflected wave will reflect like you would expect.
Then, the transmitted wave is the wave which passes through the interface and continues.
So, a good question would be to ask for the value of the reflected wave function given an initial incident wave.
Another example entirely would be to look at the reflected wave on a tensioned string. If you shake a string up and down, a wave will be sent through it. Once hitting the wall, the wave will reflect back. A good question there is asking how the amplitude of the wave changed.
What are the factors that affect the electric force?
Answer:
Strength of the charge.
Explanation:
Distance from the charge.
Friction.
Conduction (Direct Contact)
Induction.
18.1 Assessment.
18.1 Assessment.
Net Charge.
see attached, thanks !
Answer:
B = Frictional force
U need help so can some one help me
Answer:
are sure this is a question