answer this plsss
A mobile phone operates at 900 MHz.
What wavelength does it use?
Answer:
The wavelength = 0.3333 meters at 900 MHz, therefore, = /4 = 0.08333 meters.
If a force is applied to an object, which of the following must be true?
Answer:
D. The force applied will contribute to the total net force.
good luck, i hope this helps :)
Explain
(0) what is meant by regeneration,
(ii) why an analogue signal cannot be regenerated
Explanation:
1.) Regeneration is the natural process of replacing or restoring damaged or missing cells, tissues, organs, and even entire body parts to full function in plants and animals.2.) When noise is added to analogue signals, it usually sounds like background hiss. Such noise can not be removed so the original clean signal can not be re-created or re-generated.
How much work (MJ) must a car produce to drive 125 miles if an average force of 306 N must be maintained to overcome friction?
Answer:
The right solution is "61.557 MJ". A further explanation is given below.
Explanation:
The given values are:
Force,
F = 306 N
Drive,
D = 125 miles,
i.e.,
= 201168
meters
As we know,
The work done will be:
= [tex]F\times S[/tex]
On substituting the given values, we get
= [tex]306\times 201168[/tex]
= [tex]61557408 \ J[/tex]
On converting it in "MJ", we get
= [tex]61.557\times 10^6 \ J[/tex]
= [tex]61.557 \ MJ[/tex]
which is true of Pluto?
A. Pluto has a moon that is about half it's size.
B. Pluto's orbit is shorter than than Saturn's.
C. Pluto orbits the sun every 2.5 earth years.
D. Pluto is only larger than Mercury.
Answer:d
Explanation:
Probably becuase it is further than Saturn
It takes like 70 years to go around the sun
And it is bigger than the moon
Answer: pluto has a moon that is about half of its size.
Explanation: just because
Sam goes to a friend's house by bike. His friend's house is 350m away. The journey takes 50s. What is Sam's average speed?
Answer:
Sam's average speed was 7ms-1
Explanation:
speed= distance / time
speed= 350 / 50
speed= 7 metres per second.
What is the wavelength of visible light emitted at 4.2 x 10^8 Answer in units of M
Answer:
0.714 m
Explanation:
From the question,
v = λf......................... Equation 1
Where v = velocity of visible light, f = frequency of visible light, λ = wave length of visible light.
make λ the subject of the equation
λ = v/f.................. Equation 2
Given: f = 4.2×10⁸ Hz
Note: Light is an electromagnetic wave, and all electromagnetic waves travels with the same speed (3×10⁸ m/s)
Constant: v = 3×10⁸ m/s
Substitute these values into equation 2
λ = 3×10⁸/4.2×10⁸
λ = 0.714 m
Is this right HELP PLSSSS IF WHAT IS IT ! ! !
Explain how energy is produced in the Sun
Answer:
The sun generates energy from a process called nuclear fusion. During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons. Hydrogen nuclei fuse to form one helium atom. ... The sun provides more energy in an hour than the United States can use in a year!
Explanation:
Answer:
Explanation:
Like most stars, the sun is made up mostly of hydrogen and helium atoms in a plasma state. The sun generates energy from a process called nuclear fusion. During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons. ... Yet this amount of energy is enormous.
Which statement describes this image
Answer:
3rd one i think.
Explanation:
Mercury is a very small planet, with a surface that is exposed directly to space. This is because the planet has practically no
atmosphere. Normally, no atmosphere would mean very cold, but it is very hot on Mercury. Why?
The surface of Mercury looks much like Earth's moon. ... On its dark side, Mercury gets very cold because it has almost no atmosphere to hold in heat and keep the surface warm. The temperature can drop down to minus 300 degrees Fahrenheit. Sunlight never reaches into the bottoms of some craters near Mercury's poles.
Answer: B
Because Mercury is the closest planet to the sun
Explanation:
Hope this helps
• A 1200-kg car is driven through town with a speed of
15 m/s.
What is the magnitude of the car's
momentum?
If the area of a concrete slap weighing 300n is 400cm2 ,how much pressure can it apply when kept on the ground
Answer:
7500 N/m²
Explanation:
From the question given above, the following data were obtained:
Force (F) = 300 N
Area (A) = 400 cm²
Pressure (P) =?
Next, we shall convert 400 cm² to m². This can be obtained as follow:
1×10⁴ cm² = 1 m²
Therefore,
400 cm² = 400 cm² × 1 m² / 1×10⁴ cm²
400 cm² = 0.04 m²
Finally, we shall determine the pressure. This can be obtained as follow:
Force (F) = 300 N
Area (A) = 0.04 m²
Pressure (P) =?
P = F/A
P = 300 / 0.04
P = 7500 N/m²
If an element has 20 protons and 20 neutrons in the nucleus of its atoms , what is the mass number of the atom?
Answer:
A=z+n
A=20+20
A=40
Explanation:
Not sure if I'm correct but I was taught that mass number is calculated by A=z+n where A is the mass number, z is the proton number and n is the number of neutrons.
3. Jeremy has a solution with a mass of 228 g. He knows that the mass of the solvent was 224 g. How much is the mass of the solute in the solution?
True or false:
1.Gravity is the weakest universal force, but it is the most effective over long distances.
True or false:
2.An artificial satellite in a low orbit will slow down and lose altitude due to the pull of Earth's gravity.
True or false:
3.Electromagnetic force is associated with charged particles.
How much impulse is applied by a 25 N force in 30 seconds?
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Actually Welcome to the Concept of the Impulse.
Impulse is denoted by 'J'
hence, J = F. dt
so we get as,
J = (25)*(30)
J = 750 N-s
===> hence the impulse is 750 N-s
Impulse is applied by a 25 N force in 30 seconds is 750 N-s.
What is force?A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Concept of the Impulse.
Impulse is denoted by 'J'
hence, J = F. dt
so we get as,
J = (25)*(30)
J = 750 N-s
hence the impulse is 750 N-s
Impulse is applied by a 25 N force in 30 seconds is 750 N-s.
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A 4kg object has a momentum of 12 kg*m/s, what is the objects velocity?
which of the following power plants does not use thermal energy to produce electricity?
a) fossil fuel power plant
b) nuclear power plant
c) geothermal power plant
d) hydroelectric power plant
Answer: d
Explanation:
What’s your pets name if you have one if not what’s a pet that you do want for brainliest :]
Answer:
I do have a pet
Explanation:
his name is shadow and he's a cat
HELP!!! I MIGHT FAIL THE 6th GRADE IF I DON'T GET HELP!!!! The southern United States experiences periodic occurrences of severe cold and drought conditions. Which weather phenomenon most likely causes this and why?
Answer:
La Niña, because the jet stream is displaced northwards
Explanation:
La Nina is known to be a cool phase that affects the average ocean temperature. During this period the surface wind becomes stronger and there is lesser rainfall over the areas of the central tropical Pacific to which the Southern United States belongs.
Hence, when the southern United States experiences periodic occurrences of severe cold and drought conditions, the weather phenomenon most likely causes this and why is "La Niña, because the jet stream is displaced northwards."
PLEASE HELP 40 POINTS
A car of mass 700 kg and moving at a speed of 30 m/s collides with a stationary truck of mass 1400 kg, and the two vehicles lock together on impact. The combined velocity of the car and truck after the collision is m/s.
(20 points) What are wispy looking clouds, usually at high altitudes called?
stratus clouds
nimbus clouds
cirrus clouds
cumulus clouds
Answer:
the answer is c cirrus clouds
Explanation:
A 50kg gymnast is bouncing on a trampoline. If she is going down at 5m/s when she lands on the trampoline, and it bouncesher up in the opposite direction at a velocity of 4m/s, whatis her change in momentum?
Answer:
450 kgm/s upward
Explanation:
From the question,
Change in monentum = mass× change in velocity
ΔM = mΔv....................... Equation 1
ΔM = m(v-u).................. Equation 2
Where ΔM = Change in momentum, m = mass of the gymnast, v = final velocity, u = initial velocity
Given: m = 50 kg, v = -4 m/s. u = 5 m/s
Substitute these values into equation 2
ΔM = 50(-4-5)
ΔM = 50(-9)
ΔM = -450 kgm/s
Hence the change in momentum of the gymnast is 450 kgm/s upward
Two charges of 5 x 10-6 C are a certain distance apart. These two positive charges experience 3.6 N of repelling electrical force between them. How far apart are these charges?
Answer:
r = 0.2499 m
Explanation:
Use Coulomb's Law: [tex]F_{e} = kq_{1}q_{2} / r^{2}[/tex] where Fe is the electric force, q1 and q2 are the 2 charges respectively, k is a constant (8.99*10^9 N • m^2 / C^2) and r is the distance.
[tex]3.6 N = (8.99*10^{9})(5*10^{-6})(5*10^{-6}) / r^{2}[/tex]
r = 0.2499 m
The distance that should be apart from these charges should be considered when the r = 0.2499 m.
Calculation of the distance apart:Since
Two charges of 5 x 10-6 C are a certain distance apart. These two positive charges experience 3.6 N of repelling electrical force between them
So
here we use Columb law
Electric force = k * two charges * two charges)r^2
3.6 N = (8.99*10^9) * ( 5 * 10^-6) * (5*10^-6)r^2
r = 0.2499 m.
Hence, The distance that should be apart from these charges should be considered when the r = 0.2499 m.
Learn more about force here: https://brainly.com/question/15866225
plzzzz help I need help
Answer:
1. It will never run out
2. It’s better for the eviroment
Explanation:
1. Coal is not a renewable source and take along time for it to form so it will soon run out
2. Burning coal releases fossil fums into the air affecting the ozone layer but using solar power dose not release anything into the air
Answer:
Renewable energy works as clean sources of energy, and don't make as much of a detrimental impact on the environment as non-renewable energy. Air pollutants are a product of some non-renewable sources, and it negatively affects the atmosphere, humans, animals, and oceans.
Also, renewable sources won't run out, unlike other sources, as they are finite and will not last forever.
I hope this helped!
Todos los cuerpos pueden estar sobre la tierra por la fuerza de gravedad .Cuando nos caemos ,saltamos y realizamos otras actividades la fuerza de gravedad influye bastante, por lo tanto, esta fuerza la ejerce: a. El centro de la tierra b. Cada una de laas personas c. Las capas que rodean la tierra d. Todas las anteriores
Answer:
a. El centro de la tierra.
Explanation:
Se considera que la gravedad es una fuerza de atracción universal que actúa entre todos los objetos que tienen masa, energía y ocupan espacio. Por lo tanto, actúa de tal manera que une los objetos.
Además, la gravedad de la tierra hace posible que todos los objetos físicos tengan peso.
La ley de Newton de la gravitación universal establece que la fuerza de atracción (gravedad) que actúa entre la Tierra y todos los objetos físicos es directamente proporcional a la masa de la Tierra, directamente proporcional a la masa del objeto físico e inversamente proporcional al cuadrado de la distancia que separa el centro de la Tierra'y ese objeto físico.
Todos los cuerpos pueden estar sobre la tierra por la fuerza de gravedad .Cuando nos caemos ,saltamos y realizamos otras actividades la fuerza de gravedad influye bastante, por lo tanto, esta fuerza la ejerce el centro de la tierra.
Which two planets have the closest average temperature?
Answer: The planets that have the closest average temperature is
1.) Mercury which is 800 degrees Fahrenheit
2.) Venus which is about 880 degrees Fahrenheit
Hope this helps :)
The planets Mercury and Venus has the closest average temperature
What are Planets?A planet is an astronomical object that orbits a star or stellar remnant that is large enough to be rounded by gravity, but not so large as to trigger thermonuclear fusion, and that is free of planetesimals in its locality
Planets are generally divided into two main types: large, low-density gas giants and smaller, rocky terrestrials.
In order of increasing distance from the Sun, they are the four terrestrials, Mercury, Venus, Earth, and Mars, then the four gas giants, Jupiter, Saturn, Uranus, and Neptune
Given data ,
Let the first planet be represented as A
Let the second planet be represented as B
Now , the planets A and B have similar average temperature
where , the planets can have negative as well has very high temperatures
Now , when A = Mercury and B = Venus
Venus has 864 degrees Fahrenheit (462 degrees Celsius)
And , Mercury has 800 degrees Fahrenheit (430 degrees Celsius)
So , both Venus and Mercury has similar temperatures
Now , when A = Neptune and B = Uranus
Neptune has minus 353 degrees Fahrenheit (minus 214 degrees Celsius)
Uranus has minus 374 degrees Fahrenheit (minus 224 degrees Celsius)
So , both Neptune and Uranus has similar temperatures
Hence , the planets are Venus and Mercury
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Which argument best explains the charge of an atomic nucleus? *
1 point
An atomic nucleus is positively charged because it is composed of neutrons.
An atomic nucleus is positively charged because it is composed of protons.
An atomic nucleus is negatively charged because it is composed of electrons.
An atomic nucleus is negatively charged because it is composed of neutrons.
Answer:
An atomic nucleus is positively charged because it is composed of protons
Explanation:
Protons carry positive charge and nucleus only contain protons
If the work done when a charge of 5.2 × 10-13 coulombs is moved between two points is 4.7 × 10-12 joules, what is the potential difference?
A.
4.7 volts
B.
5.2 volts
C.
9.0 volts
D.
10 volts
E.
12 volts
Answer:
9.0, might be to late but someone in the future might need it.
Answer:
C. 9.0
Explanation:
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