Answer:
1. C speed
2. C Microwaves have a longer wavelength than visible light.
3. D sound
Explanation:
1. An X-ray is an electromagnetic wave. And these are waves that moves with the same speed in air. Thus all X-rays should travel with the same speed in air.
2. For electromagnetic waves, as the wavelength increases across the spectrum; the frequency of the wave decreases. Thus the correct statement is; microwaves have a longer wavelength than visible light.
3. Since electromagnetic waves moves with the same velocity (i.e the speed of light), then sound waves would not reach the earth. The correct option is D.
Avogadro’s number is useful for what?
Answer:
Scientists can discuss and compare very large numbers, which is useful because substances in everyday quantities contain very large numbers of atoms and molecules.
Explanation:
Which two statements are true about the wave shown?
Answer: The correct answers are C. and D.
Explanation:
Please Help!! This is for my Science Assignment but I dont even know how to do the last part (d; Find frictional force)
Answer:
I known this much much except c and d. Hope this helps, thank you !!
Can someone explain with the Answers pls?
Answer:
a) The frequency of the third harmonic is 786 Hz
b) The frequency of the first harmonic is 340 Hz
c) The frequency of the fifth harmonic is 1640 Hz
Explanation:
The rule is as follows:
If the first harmonic frequency (also called the fundamental frequency) is F, then:
The frequency of the second harmonic (also called the second overtone) is:
2*F
The frequency of the third harmonic (also called the third overtone) is:
3*F
And so on.
With this information, we can answer the questions:
a) We want to find the frequency of the third harmonic, such that the frequency of the first harmonic is 262 Hz.
Then we have F = 262Hz
And the frequency of the third harmonic will be:
3*F = 3*262Hz = 786 Hz
b) First harmonic for a string whose fifth harmonic frequency is 1700Hz.
Let's define F as the first frequency (the one we want to find)
Then the fifth harmonic frequency can be written as:
5*F = 1700Hz
With this equation we can find the value of F:
F = 1700Hz/5 = 340Hz
c) We want to find the fifth harmonic for a string whose third overtone (this is the same as the third harmonic) frequency is 984 Hz.
Then if the frequency of the first harmonic is F, we know that:
3*F = 984 Hz
With this we can find the value of F:
F = 984 Hz/3 =328 Hz
Now that we know the frequency of the first harmonic, we can find the frequency of the fifth harmonic:
5*F = 5*328 Hz = 1640 Hz
A 2500-kg car is being pushed up a hill at an angle of 35 degrees. Determine the gravitational
force pulling down on the car if it is accelerating up the hill at a rate of 5 m/s/s.
Answer:
The force that pulls the car down is Wₓ = 14052.6 N and the one that pushes the car up is F = 26552.6 N
Explanation:
For this exercise we will use Newton's second law, let's set a reference system where the x axis is parallel to the plane, in the adjoint we can see the forces in the system.
sin 35 = Wₓ / W
cos 35 = W_y / W
Wₓ = W sin 35
W_y = W cos 35
Wₓ = 2500 9.8 sin 35
Wₓ = 14052.6 N
let's write the equations for each axis
and
Y axis
N-W_y = 0
N = W_y
X axis
F -Wₓ = m a
F = Wₓ + m a = mg sin 35 + m a
F = m (a + g sin 35)
let's calculate
F = 2500 (5 + 9.8 sin 35)
F = 26552.6 N
The force that pulls the car down is Wₓ = 14052.6 N and the one that pushes the car up is F = 26552.6 N
Thanks+ BRAINLIST only for correct answers
AM radio waves have a
a. Shorter broadcast range than FM waves
b. Longer broadcast range than FM waves
C. Better quality sound than FM waves
d. More music options
FM radio travel a shorter distance than AM radio waves.
a.true
b.false
Radio stations, police radios, and amateur radios don't interfere because they
have different
a. volumes
b. music options
C. frequencies
Answer:
First) is b
Second) is true
Third) is C (not sure tho)
Explanation:
Because of their longer wavelengths, AM waves reflect off a layer of the upper atmosphere called the ionosphere.
One Newton is equivalent to
A. 1 kg/s2
B. 1 kg*m/s
C. 1 kg*m/s2
D. 1 kg/s
Answer:
C
Explanation:
A newton is defined as 1 kg⋅m/s2.
One newton is therefore the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in the direction of the applied force.
A box weighing 2.4 x 10^2 Newton's is lifted at a constant speed to a shelf 1.2 meters high in 4.0 seconds. What power is required to lift the box
Answer:
72Watts
Explanation:
Power = Force * distance/Time
Given the following
Force = 2.4 x 10^2 = 240N
distance = 1.2m
Time = 4.0secs
Substitute
Power = 240*1.2/4
Power = 60 * 1.2
Power = 72watts
Hence the power required to lift the box is 72Watts
Write two daily life examples for each of the following:
- Specular Reflection - Diffuse Reflection
Answer:
Hey there here is your ans
Explanation:
Specular Reflection- bathroom mirror , glare on a pair of eyeglasses
Diffuse Reflection- reflection are the reading of a notebook
Tq
Specular reflection: glare on a pair of eyeglasses, bathroom mirror.
Diffuse reflection involves reading a notepad.
What is reflection?The direction in which a wavefront travels at an interface between two distinct media changes during the process of reflection. This allows the wavefront to go back into the medium in which it was first generated. Light, music, and water waves are all examples of common phenomena that may be reflected.
The following is a list of the three most common forms of reflection:
Regular Reflection.Reflection that is DiffusedMultiple ReflectionGlare on a pair of eyeglasses or the mirror in the bathroom is an example of specular reflection. Reading from a notebook is an example of diffuse reflection.
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A book is sitting on the dashboard of a car that is stopped at a traffic light as the car starts to move forward the book slides backward off the dashboard what does the book actually do
Answer:
The book remained in its state of rest before the car started to move forward as no direct force acted on it.
Explanation:
According to Newton's first law of motion, a body will continue in its present state of rest, or if it is in motion, will continue to move with uniform speed in a straight line unless aced upon by an external force. This tendency of a body to remain in its state of reset or uniform motion in a straight line is known as inertia and is directly proportional to the mass of the body. The more massive a body, the more inertia it possesses. Thus Newton's first law is also known as the law of inertia.
Considering the case of the book on the dashboard of a stationary car which suddenly starts to move. While the car is stopped at the traffic light, the dashboard where the book sits and the book are both at rest. When the car begins to move forward, the dashboard moves forward with it. However as the book is not a part of the car, no force is directly acting on it, so the book so it stays at rest due to its inertia.
Therefore, as the car is moving forward, the stationary book appears to move backward from the reference point of the car, sliding off the dashboard.
Calculate acceleration if net force acting on an object is 140N and mass
is 15 kg
Answer:
9.33333333 m / s2
Explanation:
140 N divided by 15 kg
Which of these requirements must be met by two physical quantities when they are added together?
They must have different units when expressed in base units.
They must both have units of kilograms, meters, or seconds.
They must have the same units when expressed in base units.
They must have been given to you in the same units, such inches or centimeters.
Answer:
They must have the same units when expressed in base units
Explanation:
Too add any two values together you need them to be in the same units. but You can convert diffrent units of the same messure to each other in order to achive this; ie you can add meeters to feet if you multiply the meters by 3.28 but you can't add mass and length together.
With the concept of pattern we find that the answer for the sum of physical magnitudes is:
They must have the same units when expressed in base units.
To add two phsical quantities to meet some requirements:
* Must be of the same type
* Must be in the same base units
That they have the same type implies that we cannot add length with time or masses, length or speeds must be added with their pairs
The use of the same base unit guarantees that we use the same pattern, or that we must reduce the magnitudes to the same pattern, for example: we cannot add meters with inches directly, we must reduce inches to meters, which is the unit of the international system.
International System it guarantees the existence of common and reproducible patterns for all physical quantities.
Add two phsical quantities, the correct answer is:
must have the same units in base units
In conclusion, the measurement system and units allows adding magnitude of the same type with the same units of a base unit or standard.
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Imagine you are standing on a bathroom scale inside an elevator. What would happen to your weight reading when the elevator accelerated upward.
Answer:
it would decrease i think
Explanation:
Answer:
HMMMMMM??????
Explanation:
5.Which graph above shows an object's acceleration? 1pt
6. Why did you choose that graph in question above (explain why)? 1pt
Julieta kicks a 0.2 kg soccer ball already rolling in the same direction at 2.5 m/s. The ball leaves her foot at a speed of 20 m/s after the kick
Answer:
3.5kgm/s
Explanation:
We can calculate the momentum of Julieta
momentum = m(v-u)
Momentum = 0.2(20-2.5)
Momentum = 0.2(17.5)
Momentum = 3.5
Hence the momentum of Julieta is 3.5kgm/s
During a contest that involved throwing a 7.0-kg bowling ball straight up in the air, one contestant exerted a force of 810 N on the ball. If the force was exerted through a distance of 2.0 m, how high did the ball go from the point of release?
Answer:
23.6 m
Explanation:
We are given that
Mass of ball, m=7.0 kg
Force, F=810 N
Distance, s=2.0 m
We have to find the height of ball from the point where it releases.
Work done=K.E
[tex]Fs=\frac{1}{2}mv^2[/tex]
[tex]v^2=\frac{2Fs}{m}[/tex]
Substitute the value
[tex]v^2=\frac{2\times 810\times 2}{7}[/tex]
[tex]v^2=\frac{3240}{7}[/tex]
K.E=P.E
[tex]\frac{1}{2}mv^2=mgh[/tex]
[tex]\frac{1}{2}v^2=gh[/tex]
Where g=[tex]9.8m/s^2[/tex]
[tex]\frac{1}{2}\times \frac{3240}{7}=9.8h[/tex]
[tex]h=\frac{3240}{7\times 2\times 9.8}[/tex]
[tex]h=23.6 m[/tex]
To determine exactly where a satellite is located, engineers must think and calculate positions in three dimensions. A set of data telling engineers all of the various elements of position, velocity, and time for a satellite or spacecraft is known as a:
Answer:
State vector.
Explanation:
To determine exactly where a satellite is located, engineers must think and calculate positions in three dimensions. A set of data telling engineers all of the various elements of position, velocity, and time for a satellite or spacecraft is known as a state vector.
This ultimately implies that, state vectors gives a detailed description of the position and velocity of a satellite at a specific period of time. Also, the more accurate your input state vector, the more accurate would be the position, velocity and time for a satellite when trying to determine its location. Therefore, the time tag of a state vector shouldn't be too far from the present time of the day.
Why is thunder heard later after than the flash of light?
Answer:
During a thunderstorm, lightning is seen first and thunder is heard later on because light travels faster than sound. If you see a lightning flash but cannot hear any thunder, the thunderstorm is most likely be quite far away from you.
Suppose 2 C of positive charge is distributed evenly throughout a sphere of 1.27 cm radius. (a) What is the charge per unit volume for this situation? C/m3 (b) Is the sphere insulating or conducting? How do you know? The sphere is conducting. If it were insulating, none of the charge would be in the interior of the sphere; it would only be on the surface. The sphere is insulating. If it were conducting, none of the charge would be in the interior of the sphere; it would only be on the surface. The sphere is conducting. If it were insulating, all of the charge would be in the interior of the sphere; not on the surface. The sphere is insulating. If it were conducting, all of the charge would be in the interior of the sphere; not on the surface.
Answer:
a) ρ = 2.33 10⁵ C / m³, b) INSULATING
Explanation:
a) For this exercise we use the important concept of density
ρ = Q / V
The volume of a sphere is
V = 4/3 πr3
V = 4/3 π (1.27 10⁻²)³
V = 8.58 10⁻⁶ m³
let's calculate
ρ = 2 / 8.58 10⁻⁶
ρ = 2.33 10⁵ C / m³
b) in a conductor the charges are mobile, therefore due to electoral repulsion all the charges must concentrate on the surface.
In an insulator the charges are fixed, therefore they are distributed throughout the volume
Consequently the sphere must be INSULATING
What is the specific heat of water? A. 1.00 J/gºC
B. 4.18 J/gºC
C. 9.18 J/gºC
D. 8.36 J/gºC
Answer:
B 4.18J\g degree C is the specific heat of water
I NEED HELP AS SOON AS POSSIBLE PLEASEEE!!
DO NOT ANSWER IF YOU DON'T KNOW IT PLEASE!
Use The Kinetic Theory To Explain:
•Boyle's Law
•Charles' Law
•Pressure Law
Answer:
Kinetic theory is based on the kinetic energy of moving particles. In Boyle's Law the temperature is helped constant, so the kinetic energy of the molecules is a constant. The pressure and the volume are inversely related in Boyle's Law. In Kinetic theory pressure is created by the collision of particles.
plz mark me as brainly
Explanation:
can someone do this assignment for me about
force
Answer:
Newtons 3sd law
Force = mass × acceleration
3rd photo about momentum
I'm which direction does earth rotate
Answer:
Earth rotates eastward, in prograde motion.
Answer:
Earth rotates eastward, in prograde motion. As viewed from the North Pole, Earth turns counterclockwise.
Explanation:
You can use _______________ to change a liquid into a gas.
Answer:
below
Explanation: When a liquid changes into a gas vaporization has occurred. The process can either occur due to boiling or evaporation. Boiling occurs when the vapor pressure of the liquid is raised (by heating) to the point where it is equal to the atmospheric pressure.
You can use thermal energy to change a liquid into a gas.
What is thermal energy?By virtue of its temperature, a system in a condition of thermodynamic equilibrium has thermal energy, or internal energy. Unlike the energy of systems that are not in a state of thermodynamic equilibrium, thermal energy cannot be transformed into meaningful work as quickly.
For instance, the same fluid or solid in a thermodynamic equilibrium state with the same energy (as thermal energy) cannot do work unless it is combined with another substance at a different temperature, as in a heat engine. However, the same fluid or solid in a moving state with the same energy (as mechanical energy) can be converted to work in some mechanical device, such as a windmill or a waterwheel.
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What charges must the particles have to create the electric field shown?
A. X and Y are both positive
B. X is negative and Y is positive.
C. X and Y are both negative.
D. X is positive and Y is negative.
Answer: Choice A, that X and Y are both positive
Explanation: positive charges are attracted to negative charges, so for their electric fields, positive charges point outward while negative charges point inward. In this model, it shows that both X and Y are pointing outward, hence they both have to have positive charges
You move a 25 N object 5.0 meters. How much energy did you transformed?
Consider the common measurement speed = 55 mph. What is the magnitude quantity?
Speed, mph, miles per hour, 55
Answer:
Magnitude = 55
Quantity = Speed
Explanation:
We are told that the speed is 55 mph. This implies that the magnitude is 55 while the unit is mph.
Also, physical quantities are usually things that can be measured such as distance, voltage, temperature e.t.c
Answer:
i think its speed
Explanation:
What are the basic components of electric circuit?
Answer:
Every electric circuit, regardless of where it is or how large or small it is, has four basic parts: an energy source (AC or DC), a conductor (wire), an electrical load (device), and at least one controller (switch). Visualize what happens when you switch on a room light.
PLS ANSWER FAST WILL GIVE BRANLEST!!!
Answer using mass m= F divided by a
And also use kilograms {kg}
A cannonball accelerates at 1000 m / s2 from an applied force of 5000 N. What is the mass of the cannonball?
Answer:
mass=force/acceleratio
m=5000/1000
m=5kg
[tex]\huge\bf{\pink{\underline{\underline{\mathcal{AnSwer࿐}}}}}[/tex]
Given:- acceleration = 1000 m/s²force = 5000 N To find:- Mass of the cannonball Formula to be used:-[tex]\longrightarrow[/tex] [tex]\underline{\boxed{\sf mass = \dfrac{force}{acceleration}}}[/tex]
Solution:-:[tex]\implies[/tex] [tex]\sf mass = \dfrac{5000}{1000}[/tex]
:[tex]\implies[/tex] [tex]\sf mass = 5 kg [/tex]
hence, the required answer is 5kg.
______________________________Consider a point charge qqq in three-dimensional space. Symmetry requires the electric field to point directly away from the charge in all directions. To find E(r)E(r)E(r), the magnitude of the field at distance rrr from the charge, the logical Gaussian surface is a sphere centered at the charge. The electric field is normal to this surface, so the dot product of the electric field and an infinitesimal surface element involves cos(0)=1cos(0)=1. The flux integral is therefore reduced to ∫E(r)dA=E(r)A(r)∫E(r)dA=E(r)A(r), where E(r)E(r)E(r) is the magnitude of the electric field on the Gaussian surface, and A(r)A(r)A(r) is the area of the surface.
Answer:
E = [tex]\frac{1}{4\pi \epsilon_o } \ r^2[/tex]
Explanation:
For this exercise let's use Gauss's law. The Gaussian surface that follows the symmetry of the charges is a sphere
Ф = ∫ E. dA = [tex]\frac{x_{int} }{\epsilon_o}[/tex]
the bold are vectors, the radii of the sphere and the electric field are parallel therefore the scalar product reduces to the algebraic product
Ф = ∫ E dA = \frac{x_{int} }{\epsilon_o}
E ∫ dA = \frac{x_{int} }{\epsilon_o}
E A = \frac{x_{int} }{\epsilon_o}
the area of a sphere is
A = 4π r²
the charge inside the sphere is q = + q
we substitute
E 4π r² = \frac{x }{\epsilon_o}
E = [tex]\frac{1}{4\pi \epsilon_o } \ r^2[/tex]