Which of the following is true about galaxies?
a. Galaxies are moving away from each other.
b. Galaxies are moving toward each other.
c. Galaxies move in a random pattern.
d. Galaxies are stationary.
Answer:
Galaxies move in a random pattern.
Answer:
a
Explanation:
the universe is expanding
i remember learing this
hope this helps
brailest plzz
Which of these is not method of preventing the corrosion of metals?
A. galvanising
B. painting
C. plating
D. rusting
Answer:
D. rusting is answer....
1.
100 cm are equivalent to 1 m. How many cm are equivalent to 3 m? Briefly explain how you
could convert any number of meters into a number of centimeters
Answer:
[tex]300[/tex] cm are equivalent to [tex]3[/tex] m.
Explanation:
[tex]100[/tex] cm are equivalent to [tex]1[/tex] m.
[tex]100 \mathrm{~cm}$=1{~m}$[/tex]
[tex]3 \mathrm{~m}$=3\times100[/tex]
[tex]=$300{~cm}$[/tex]
To convert meters ([tex]\mathrm{~m}$[/tex]) into number of centimeters ([tex]\mathrm{~cm}$[/tex]), multiply that number by [tex]100[/tex].
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two spheres are launched horizontally from a 1.0 m high table. Sphere A is launched with an initial speed of 5.0m/s. Sphere B is launched with an intial speed o f2.5m/s
a. what are the times for each sphere to hit the floor?
b. What are the distance that each travels from the edge of the table?
Who was the first person
who suggested that all
particles can be thought of
as waves?
Answer:
Louis de Broglie
Good Luck!!
What is an alpha particle?
a complete helium atom
a complete helium atom, ,
the nucleus of a beta particle
the nucleus of a beta particle
a rogue valence electron
, , a rogue valence electron
two protons and two neutrons
Answer:
two protons and two neutrons
it's the answer. hope it helps
Alpha particles have two protons and two neutrons. Therefore, option (D) is correct.
What is an alpha particle?Alpha particles can be defined as positively charged particles released from the decay of several radioactive materials. The mass of the Alpha particle is because of the presence of two protons and two neutrons. Therefore, the Alpha particles nucleus is very similar to the nucleus of the Helium atom and are denoted by the Greek alphabet α.
An alpha particle or ray is also known as doubly ionized helium nuclei (He²⁺). The alpha particle's mass is equal to 6.64 × 10⁻²⁷ Kg. Alpha particles are generally generated during the standard radioactive decay of atomic nuclei.
Alpha particles contains the kinetic energy of 5MeV and a speed of 5 % of that of the speed of light. They are also formed in high-energy particle accelerators and are highly ionized particles with low penetration depth compared to other particles.
Learn more about alpha particles, here:
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Two plane metal plates 4 cm long are held horizontal 3 cm apart in a vacuum one being vertically one above other. The upper plate is at a p.d 300 volt and the lowered is earthed. Electrons having velocity of 10^7 m/s are injected horizontally midway between the plate and in a direction parallel to the 4cm edge. Calculate the vertical deflection of the electron beam as it emerges from the plates. (e/m=1.8 x 10^11Ckg^- 1).
With Newton's second law and kinematics we find the deflection of the electron beam is y = 1.44 cm
given parameters
the voltage of each upper plate V = 300 V, the lower one zero volts the length of the plates, l = 4 cm (1 m / 100 cm) = 0.04 m the separation between the plates d = 3 cm = 0.03 m the velocity of the electrons v = 10⁷ m/s parallel to the plates the relationship e / m = 1.8 10 11 C / kg
to find
the deflection (y) of electrons
the electric field and the electric potential are related
V = -E d
E = - V / d
where E is the electric field, V the electric potential and d the separation between the plates
E = - 300 / 0.03
E = -1 10⁴ N / C
Let's solve this exercise in parts
1st part. Let's set a reference system with the horizontal axis in direction to the length of the plates and the y axis in the vertical direction, the zero is located at the initial point of the plate and half of its separation.
Let's use Newton's second law to find the acceleration in the y-axis of the electrons
F = m a
electric force is
F = q E
q E = m a
a = q / m E
the face of electrons is negative q = -e
a = - e / m E
a = - 1.8 10¹¹ (- 1 10⁴)
a = 1.8 10¹⁵ m /s²
this acceleration is directed upwards, that is, the electrons approach the positive plate.
2nd part. We use kinematics to find the time it takes for electrons to pass the plates; on the x-axis there is no acceleration, so we use the uniform motion relationships
v = x / t
t = x / v
t = 0.04 / 1 10⁷
t = 4 10⁻⁹ s
For the y-axis, let it be known that the electrons are initially in the middle between the plates, so y₀ = 0 and the velocity eg this axis is zero, we look for the deflection at the end of the plate
y = y₀ + v_{oy) t + ½ a t²
y = 0 + 0 + ½ a t²
y = ½ (1.8 10¹⁵) ( 4 10⁻⁸ )²
y = 14.4 10⁻³ m = 1.44 10⁻² m
y = 1.44 cm
We can use Newton's second law and kinematics to find the distance that the electron beam deviates from the middle of the plate is y = 1.44 cm, therefore the beam of electrons leaving the plates
learn more about Newton's second law and kinematics here: brainly.com/question/13016721
Answer:
The vertical deflection of the beam of an electron beam is 1.44×〖10〗^(-2) m.
Explanation:
Velocity (v) = 〖10〗^7 m/s
p.d. (V) = 300 V
Length of metal plates (x) = 4cm = 0.04 m
Separation (d) = 3 cm = 0.03 m
Specific charge of an electron (e/m) = 1.8×〖10〗^11 C/kg
Vertical deflection (y) = ?
The vertical deflection of electron inside the electric field is
y=1/2 at^2
=1/2 eE/m (x/v)^2
=1/2 (e/m) V/d (x/v)^2
=1/2×1.8×〖10〗^11×300/0.03×(0.04/〖10〗^7 )^2
⸫ y=1.44×〖10〗^(-2) m
Hence, the vertical deflection of the beam of an electron beam is 1.44×〖10〗^(-2) m.
1. Which description defines pseudoscience?
A. process of investigation that resembles
science and follows scientific methods
B. process of investigation that resembles
science, but does not follow scientific
methods
C. process of investigation that does not
resemble science, but follows scientific
methods
D. process of investigation that does not
resemble science and does not follow
scientific methods
Answer:
No C. process of investigation that does not resemble science, but follows scientific methods.
A __________ is an area of land that rises very high above the land around it.
Group of answer choices
Answer: I would say a mountain because it is a area of land risen high above the other land around it.
Explanation:
Determine the units of the quantity described by each of the following combinations of units:
a. kg (m/s) (1/s)
b. (kg/s) (m/s^2)
c. (kg/s) (m/s)^2
d. (kg/s) (m/s)
WE have that the unit of the quantities are described
a.kg (m/s) (1/s)=Newton
b. (kg/s) (m/s^2)=None
c. (kg/s) (m/s)^2= Power in Watt
d. (kg/s) (m/s)=Newton
From the question we are give the units
a.kg (m/s) (1/s)
b. (kg/s) (m/s^2)
c. (kg/s) (m/s)^2
d. (kg/s) (m/s)
a)
Generally
kg (m/s) (1/s) is Represented as Newton
Where Newton is the unit Force and Weight
b)
Generally
(kg/s) (m/s^2) is the unit representation of No function
Therefore
None
c)
Generally
(kg/s) (m/s)^2 is the unit representation of Power in Watt
Therefore
Watt
d)
Generally
(kg/s) (m/s) is the unit representation of Newton
Where Newton is the unit Force and Weight
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A garden table weighs 40N and has a top surface of area 2m^2 is raining and the rain produces
a pressure of 4 N/m^2 on the table,
What is the force exerted by the table on the ground?
A 20 N
B 32N
С
42N
D
48N
4. List three examples each of objects that are com-
monly measured by mass, by volume, and by length.
By mass - Vegetables,wheat, rice.
By volume - carocin,water,oil.
By length- Rod,thread,cloths.
Help!
A car is moving with a velocity of 5 m/s changes to 15 m/s in 2 sec. Find
(i) Acceleration
(ii) Distance covered
Answer:
5 m/s² & 20 m
Explanation:
#1
Acceleration = Final velocity - Initial velocity/Time
Acceleration = 15 - 5/2
Acceleration = 10/2
Acceleration = 5 m/s²
#2
v² - u² = 2as
(15)² - (5)² = 2(5)(s)
225 - 25 = 10s
200 = 10s
200/10 = s
20 = s
What’s important about physical health
Answer:
Physical activity or exercise can improve your health and reduce the risk of developing several diseases like type 2 diabetes, cancer and cardiovascular disease. Physical activity and exercise can have immediate and long-term health benefits. Most importantly, regular activity can improve your quality of life.
Explanation:
hope it is helpful for you keep smilingWhat is the car’s average velocity (slope) between “O” and “A”? (y2-y1 / x2-x1) = slope
(1,24) (0,0)
Please find the attached photograph for your answer. Hope it helps! Please do comment
The car’s average velocity is mathematically given as
V=4m/s
What is average velocity?Average velocity is simply the mean rate of change of position of a car over a period of different times and this can be used to attain velocity of a car that has been in different velocity states
What is the car’s average velocity?Generally, the equation for the Velocity is mathematically given as
V=(AI/OI)
Therefore
V=24/1
V=4m/s
In conclusion, the car’s average velocity
V=4m/s
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2. Another car weighs 2000kg, you can push it .05 m/s?, how much force are you
applying to the car? Again use F=MA.
Answer:
[tex]\boxed {\boxed {\sf 100 \ Newtons}}[/tex]
Explanation:
We are asked to calculate the force you are applying to a car. According to Newton's Second Law of Motion, force is the product of mass and acceleration. Therefore, we can use the following formula to calculate force.
[tex]F= m \times a[/tex]
The mass of the car is 2000 kilograms and the acceleration is 0.5 meters per second squared.
m= 2000 kg a= 0.05 m/s²Substitute the values into the formula.
[tex]F= 2000 \ kg \times 0.05 \ m/s^2[/tex]
Multiply.
[tex]F= 100 \ kg *m/s^2[/tex]
Convert the units. 1 kilogram meter per second squared is equal to 1 Newton. Our answer of 100 kilogram meters per second square is equal to 100 Newtons.
[tex]F= 100 \ N[/tex]
You apply 100 Newtons of force to the car.
(4) A roller coaster is at the top of a 72 m hill and has a mass of 700 kg. The coaster this moment) has energy. Calculate it.
Answer:
here
Explanation:
Answer:
493,420 Joules
Explanation:
Potential energy of the roller coaster
PE = mgh
Where
m = mass (kg)
g = gravitation (9.8 m/s²)
h = height
PE = 72 x 700 x 9.8 (in some cases 10)
PE = 493,420 J
If g = 10
PE = 504,000 J
y UD Eda
NF-22
11. A race car traveling at +44 m/s is uniformly accelerated to a velocity of +22 m/s over an
11-s interval. What is its displacement during this time?
a
We have to find acceleration first.
Initial velocity=u=44m/sFinal velocity=v=22m/sTime=11s=t[tex]\boxed{\sf Acceleration=\dfrac{v-u}{t}}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{22-44}{11}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{-22}{11}[/tex]
[tex]\\ \sf\longmapsto Acceleration=-2m/s^2[/tex]
Now Distance=sUsing second equation of kinematics
[tex]\boxed{\sf s=ut+\dfrac{1}{2}at^2}[/tex]
[tex]\\ \sf\longmapsto s=44(11)+\dfrac{1}{2}(-2)(11)^2[/tex]
[tex]\\ \sf\longmapsto s=484+(-1)(121)[/tex]
[tex]\\ \sf\longmapsto s=484-(121)[/tex]
[tex]\\ \sf\longmapsto s=363m[/tex]
Explanation:
[tex]we \: want \: to \: find \: displacement \\ we \: can \: use \: newtons \: laws \: of \: motion \\ s = ut + \frac{1}{2} a {t}^{2}....(1) \\here \: 44 = u \: (initial) \\ v = 22(final) \\ t = 11 \\ then \: \\ s = 44 \times 11 + \frac{1}{2} (\frac{22 - 44}{11} ) {11}^{2} \\ s = 484 + \frac{1}{2} \times \frac{ - 22}{11} \times 11 \times 11 \\ s = 484 - 121 \\ s = 363m \\ thank \: you[/tex]
Brainliest if answered correctly! Will be reported if you leave spam or links. Only have to answer at least 2 of the words.
Complete the following worksheet. Use the definitions below to fill in the worksheet. Write a sentence that uses the word in context as well. For example, if my word was "science", the sentence "Today I did science." would be unacceptable. Your sentence should demonstrate that you understand what the word means.
Here are the words you have to use in a sentence:
Science
Testable Question
Inference
Data
Hypothesis
Procedure
Conclusion
Evidence
Answer:
Multiple Solutions Below:
Explanation:
In the carrier of being a scientist, they often look at scientific data, then they use that data to make a hypothesis for their experiment.
Science is an interesting field that requires a long list of procedures to ensure that everyone is safe, and that it is done in an orderly fashion.
My friends hypothesize about the idea how the badger knows how to build a dam.
At a crime scene, a CSI investigates a substance on the ground, she finds a testable question and ponders to herself about what the substance is and goes to her lab.
In English class, things are not often in bold letters on what they mean, so we have to make an inference about the text to try and decipher what they mean.
Finally,
Science is one of four main subjects taught in school from fifth to twelfth grade, and beyond.
Hope this helps, and I hope it gives you multiple things to pick as the answer! Have a good day!
What would happen if the chain reaction caused by the splitting of atoms is not properly controlled?
Answer:
Is this what you needed.
Explanation:
If a nuclear chain reaction is uncontrolled, it produces a lot of energy all at once. This is what happens in an atomic bomb. However, if a nuclear chain reaction is controlled, it produces energy much more slowly. This is what occurs in a nuclear power plant.sorry if I didn't get this right.
the science building is 5.25 m tall a. How many decimeters is it? b. How many millimeter is it? *show work*
Answer:
5.25m to 52.5 Decimeters (10x)
5.25m to 5250 Millimeters (1000x)
Which of the following is true about galaxies?
a. Galaxies are moving away from each other.
b. Galaxies are moving toward each other.
c. Galaxies move in a random pattern.
d. Galaxies are stationary.
Answer:
a
Explanation:
i remeber learing this
hope this helps
branliest plzz
What is the mass of a gold bar that has a density of 19.3 g/mL3 and a volume of 100 cm3?
Answer:
density=mass/volume
density=19.3
mass=x
volume=100
we are looking for mass so we have to change the subject formula to m=dv
which means mass is equals to density multiplied by volume
m= 19.3 x 100
which is 1930.
100 points! Help ixl! On a time limit!
Answer:
I think it is 60m/min ooh
A stream of electrically charged particles flowing from the sun is called the
a. Van Allen belt.
b. magnetosphere.
c. solar wind.
d. magnetic field.
Answer:
solar wind
Explanation:
the sun's atmosphere is made of hydrogen which itself made subatomic particle. These particle are constantly boiling off the sun and streaming outward at very speed. So, the sun's magnetic field and particles are called solar wind.
Answer:
c
Explanation:
Solar wind
Who was the first scientist to provide documentation and evidence to show a heliocentric model of the universe?
A. Tycho Brahe
B. Hipparchus of Nicaea
C. Aristarchus of Samos
D. Eudoxus of Cnidus
Answer:
Aristarchus of samos
Explanation:
Aristarchus was a great scientist in ancient world He first proved the universe by his heliocentric modelAnswer:
C. Aristarchus of Samos
Explanation:
Aristarchus created the first known heliocentric model of the Solar System. He also thought stars were other bodies like the sun, but much farther away.
why does sound not transmit in vacuum
Answer:
because sound needs medium to transmit.
The sound is produced by vibration and if there is no medium there is no vibration and no vibration means no sound.
help please
thankya
Answer:
A
Explanation:
Please help I’m dying trying to solve this.
Please find attached photograph for your answer. The answers are all estimated values. Hope it helps! Please do comment
someone please help!!
what is the formula and SI unit of liquid pressure.
Answer:
Formula : P = hdg
SI unit = N/m^2
