Answer:
[tex]2\times 10^{8}\ \text{m/s}[/tex]
Explanation:
[tex]n[/tex] = Refractive index of glass = 1.5
[tex]c[/tex] = Speed of light in vacuum = [tex]3\times 10^8\ \text{m/s}[/tex]
Refractive index is given by
[tex]n=\dfrac{c}{v}\\\Rightarrow v=\dfrac{c}{n}\\\Rightarrow v=\dfrac{3\times 10^8}{1.5}\\\Rightarrow v=2\times 10^{8}\ \text{m/s}[/tex]
The speed of light in the glass is [tex]2\times 10^{8}\ \text{m/s}[/tex].
number of atoms of each element Sodium oxide?
Answer:
There are two sodium atoms for every one oxygen atom in Sodium Oxide.
Explanation:
Answer:
2 sodium atoms
1 oxygen atom
Explanation:
Sodium is in valency 1 while oxygen is in valency 2. When the two combine they exchange their valencies hence the number of their atoms. Not so sure ..
in your own opinion do you think liquorice all-sorts is a healthy ofor ptions snack
Well its a snack
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A car travels along a straight road to the east for
100 meters in 4 seconds, then has to turn around
and goes back west for 50 meters in 1 second.
Determine average speed and average velocity.
Answer: 90 m/s, 70 m/s
Explanation:
Given
A car travels 100 m east for 4 seconds and then turn around
goes back west for 50m in 1 sec
Distance traveled in the east is [tex]100\times 4=400\ m[/tex]
Distance traveled in the west is [tex]50\times 1=50\ m[/tex]
Total distance[tex]=400+50=450\ m[/tex]
total displacement[tex]=400-50=350\ m[/tex]
total time [tex]t=4+1=5\ s[/tex]
Average speed
[tex]\Rightarrow s_{avg}=\dfrac{\text{distance}}{\text{time}}=\dfrac{450}{5}\\\\\Rightarrow s_{avg}=90\ m/s[/tex]
Average velocity
[tex]\Rightarrow v_{avg}=\dfrac{\text{displacement}}{\text{time}}=\dfrac{350}{5}\\\\\Rightarrow v_{avg}=70\ m/s[/tex]
Which statement is true about the thermal energy of an object? Choose the correct answer.
1. Thermal energy is the internal potential energy of an object.
2.Thermal energy is the heat that is transferred in and out of an object.
3. Thermal energy is the sum of kinetic and potential energy of an object.
4. Thermal energy is the internal kinetic energy of the molecules of an object.
Answer:
the answer is number 2
Explanation:
did this earlier this year
How do the sperm cells of nonvascular plants reach the egg cells during reproduction?
A.) The sperm cells are forcefully ejected from their capsules to hit the egg cells.
B.) The sperm cells are blown by the wind and land on the egg cells.
C.) The sperm cells swim to the egg cells through their watery surroundings.
Answer:
C.) The sperm cells swim to the egg cells through their watery surroundings.
The linear expansivity of metal P is twice that of another metal Q. When these materials are heated through the same temperature change, their increase in length is the same. Calculate the ratio of the original length of P to Q
Answer:
The answer is 1:2.
Which has the strongest covalent bonds?
H2O
CO2
H2
N2
Answer:
co2 would be the best answer and because i just took this
Explanation:
When an object (like a ball) falls, some of its___ energy changes to ___ energy, due to the law of conservation of energy
Answer:
potential, kinetic
Explanation:
pls give brainliest :p
What’s the difference between mechanical and chemical weathering
Answer:
Mechanical weathering is the physical breakdown of rock into smaller pieces. Chemical weathering is the breakdown of rock by chemical processes.
Explanation:
Mechanical weathering (also called physical weathering) breaks rock into smaller pieces. These smaller pieces are just like the bigger rock, just smaller. That means the rock has changed physically without changing its composition. The smaller pieces have the same minerals, in just the same proportions as the original rock.
Chemical weathering is the other important type of weathering. Chemical weathering is different from mechanical weathering because the rock changes, not just in size of pieces, but in composition Chemical weathering works through chemical reactions that cause changes in the minerals.
A wave has a wavelength of 14 m and a frequency of 24 Hz, what is the speed of the wave?
Answer:
v = [tex]\lambda[/tex]xf = 14 x 24 336m/s
Explanation:
AWARDING BRAINLIEST
The distance traveled by an object divided by the time it takes to travel that distance is called
a.
average velocity.
c.
average acceleration.
b.
average speed.
d.
activity.
Answer:
I'm really not that good at this but i think the answer is b
Explanation:
l'm really hoping this helped u
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
What distance separates Earth and the Sun? A 300,000 km per second B Eight light-minutes C 149 million light-seconds D One light-year
Answer:
B Eight light-minutes
Explanation:
In the case when the distance separated earth and the sun so here we orbit the sun for a 150 million km distance and the light moves would be 300,000 kilometers per second
Now divide this
= 150 million ÷ 300,000 kilometers per second
= 500 seconds
This 500 seconds represent 8 minutes and 20 seconds
Hence, option B is correct
Answer:
B) Eight light-minutes
how does a dry cell produce electricity
Answer:
the cell which does not contain acid is called dry cell
Explanation:
it is made in a zinc container. if the dry cell is not used for a long time, it stops working due to local action.
thank you :)06
In which diagram is the moment of the force the largest?
©
300 N
300N
300 N
lo
16 cm
A
B
16 cm
A: A
B: B
113
C: C
D: They are all the same
D
Explanation:
The are the same but difference
PLEASE HELP ME ASAP!!!
Answer:
90
Explanation:
The portion where gas turns to liquid
the movement of matter is
called
Answer:
From batteries to biology, how atoms move is critical for understanding how matter behaves. These new FPMD techniques streamline calculations to accelerate run time and boost efficiency, allowing researchers to simulate a million or more atoms
Explanation:
The graph above represents a object moving
____
The velocity of the object is i
____
The acceleration of the object is ____
The object's velocity is positive and decreasing.
Its acceleration is negative.
Giving brainliest!! if you answer correctly :)
Answer:
Mechanical Energy- D
Nuclear Energy- C
Thermal Energy- A
Chemical Energy- B
Explanation:
Hope this helps :)
Iceland is located along the mid Atlantic ridge. Would you predict that Iceland's land mass will expand or contract over the coming millenia? Justify your answer.
A wheel of mass 500 kg and 1 m diameter makes 500
revolutions per minute. Assuming the mass to be concentrated
along the rim, calculate the angular velocity of wheel.
Answer:
w=120rpm
Considering it a disc
L=Iw
=220×(412)×120×602π
=31.415kgm/s
The angular velocity of wheel should be considered as the 31.415kgm/s when the mass of wheel is 500 and the diameter is 500 revolutions per minute.
Calculation of the angular velocity of wheel:Since
A wheel of mass 500 kg.And 1 m diameter makes 500 revolutions per minute.So here
We know that
w = 120rpm
And,
L = Iw
So,
= 220×(412)×120×602π
= 31.415kgm/s
hence, The angular velocity of wheel should be considered as the 31.415kgm/s.
Learn more about velocity here: https://brainly.com/question/17802937
Two air craft P and Q are flying at the same speed 300m/s. The direction along which P is flying is at right angles to the direction along which Q is flying. Find the magnitude of velocity of the air craft P relative to air craft Q
Answer:
424.26 m/s
Explanation:
Given that Two air craft P and Q are flying at the same speed 300m/s. The direction along which P is flying is at right angles to the direction along which Q is flying. Find the magnitude of velocity of the air craft P relative to air craft Q
The relative speed will be calculated by using pythagorean theorem
Relative speed = sqrt(300^2 + 300^2)
Relative speed = sqrt( 180000 )
Relative speed = 424.26 m/s
Therefore, the magnitude of velocity of the air craft P relative to air craft Q is 424.26 m/s
Uncle Harry weighs 80 newtons. What is his mass in
kilograms?
Answer:
8.158 Kilograms Force
Explanation:
Answer:
8.1577297038
Explanation:
pls give brainlest
A 50 kg student stands on a 4 kg skateboard at rest. The student catches a 9 kg backpack moving with a horizontal speed of 2 m/s in the direction the skateboard is free to roll.
How fast will the student and the skateboard move after catching the backpack, assuming friction is negligible? Round your final answer to the hundredths place.
An engine applies a force of 500 N on a car for a distance of 275m How much work is done?
Answer: 137500 J = 138 kJ
Explanation: work W= F·s= 500 N · 275 m
The amount of potential energy (PE) an object has depends on the object's _____________. *
height
motion
velocity
Joules
The amount of kinetic energy (KE) an object has depends on the object's _____________ *
height
motion
acceleration due to gravity
Joules
A boy pushes a 50 kilogram wagon with a force of 4 N east while an orangutan pushes the wagon
with a force of 4 N west. What is the resulting acceleration of the wagon?
Your friend tells you That there is no gravity in the space shuttle, which orbits 400 km (250 miles) above the Earth.
Do you agree or disagree? Explain
Answer:
Yes. Space is somewhat voidless. Space has no atmosphere, just planets, stars, and dark matter. Space can be said to be special. Space never ends. Gravity would cause an object to fall down. However, since space never ends, an object could continue moving forever.
At an altitude 400 km (250 miles) above the Earth, gravity is nearly 90 % as strong as on the surface of the earth.
What is the gravity of the earth?The gravity of Earth can be described as the net acceleration that is imparted to objects due to the combined effect of gravitation and centrifugal force. It can be defined as a vector quantity, whose direction coincides with a plumb bob and strength or magnitude.
In SI units gravitational acceleration is expressed in meters per second squared or equivalently in newtons per kilogram. Near Earth's surface, the gravity acceleration is approximately 9.81 m/s², ignoring the effects of air resistance.
The gravity of the earth decreases with altitude rises above the Earth's surface because of the greater distance from the Earth's center. At an altitude of 400 kilometers equivalent to an orbit of the ISS, gravity is nearly 90% as strong as at the Earth's surface.
Learn more about Gravity, here:
https://brainly.com/question/1479537
#SPJ2
Need help, please :D.
What is the kinetic energy of a 160 kg object that is moving at a speed of 20 m/s ?
How fast will a 1200 kg car be travelling when its momentum is 2400 kgm/s?
Answer:
Slow
Explanation:
The equation is:
p = mv
m = 1200
p = 2400
2400 = 1200v <-- divide both sides by 1200
v = 2 m/s