Answer:
sound energy is form of mechanical energy.Sound travels as waves of energy, but, unlike light, the waves transmit energy by changing the motion of particles. ... That means that each individual particle is only moving a short distance.
A boy notices that 45 complete waves travel past him in ninety seconds. What is the
frequency of these water waves
Answer:
0.5 Hz
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A micro element that is essential for the formation of haemoglobin
Iron ( Fe ) is a micro element that is essential for the formation of haemoglobin.
Hemoglobin has two components-
Haem - The iron partGlobin - The proteinaceous partA car is moving along a road. What force between the tyres and the road makes the car stop? Tick the correct box. Air Resistance, Gravity, Friction or weight?
Answer:All the forces are acting. The force due to which the car stops that is between road and tire is "friction".
Explanation:
What is the kinetic energy of a 1 kg ball thrown to a height of 10 meters?
A.9800 Joules
B.98 Joules
C.9.8 Joules
D.98 Joules
Answer:
I think it's B
Explanation:
sorry if im wrong
A dentist uses a small concave mirror to locate a cavity in a patient's tooth. The focal length of the mirror is 2.00 cm. If the mirror is held 1.60 cm from the tooth, how many times bigger will the image be? (In other words, what is the magnification?)
Answer:
m = 4.0
Explanation:
For this exercise in geometric optics we will use the equation of the constructor
[tex]\frac{1}{f} = \frac{1}{p} + \frac{1}{q}[/tex]
where f is the focal length, p and q are the distance to the object and image, respectively.
In the exercise indicate the focal length f = 2.00 cm, the distance to the object p = 1.60 cm, let's find the distance to the image
[tex]\frac{1}{q} = \frac{1}{f} - \frac{1}{p}[/tex]
let's calculate
[tex]\frac{1}{q} = \frac{1}{2} - \frac{1}{1.6}[/tex]1 / q = ½ - 1 / 1.6
[tex]\frac{1}{q}[/tex] = -0.125
q = -8 cm
the magnification is
m = - q / p
m = 8/2
m = 4.0
Which element is represented by the atomic model below?
P:10
N:10
A. calcium
B. helium
C. neon
D. oxygen
A team of students develop a model to describe why structural changes to genes affect proteins. The team provides two groups of students with the same materials, but one group must make a bridge while the other group makes a building. Analyze the team's model and explain why it incorrectly models the impact of gene mutations on proteins.
Answer:
The team's model is incorrect because they provide the same materials to build the same product.
Explanation:
The fundamental and the structural unit of the hereditary that codes for certain information and proteins required for signalling and cell functioning are called a gene.
The bridge model is correct.
How the gene mutations can impact the proteins?Gene codes for various proteins required by the cell to function and regulate, a mutation or change in the sequence of the region will result in the modification of the proteins coded and hence the genotype and the phenotype will alter.
In the building model if a gene is mutated and the proteins get altered then the whole sequence and the information for which it is coding will modify.
Therefore, gene mutation will affect the proteins.
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A 76 N crate is hung from a spring
(k = 450 N/m). How much displacement
is caused by the weight of this crate
Answer: 0.169 (3 s.f.)
Explanation:
Force = 76 N
Spring constant = 450 N/m
Extension/displacement = x
Hooke's law states that: F = kx
Therefore, 76 = 450 X x
76/450 = x
0.169 (3 s.f.) = x
Which bar graph could represent the reaction rates of a reversible reaction
that has just begun?
The answer is A. Just did it.
Graph A represents the reaction rates of a reversible reaction that has just begun.
What is meant by reversible reaction ?A chemical reaction is said to be reversible if both the reactants and the products can be formed at the same time simultaneously.
Here,
Both the forward and reverse reactions typically take place concurrently in a reversible reaction.
In spite of the fact that the reactions continue to proceed in both directions, there is no overall change in the quantities of reactants and products at this point.
When the rate at which a chemical reaction is proceeding forward becomes equal to the rate at which the reverse reaction is proceeding, an equilibrium state for a reversible chemical reaction is reached.
Hence,
Graph A represents the reaction rates of a reversible reaction that has just begun.
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What would be the mass of the same object on the moon, where gravity is one sixth of Earth gravity?
An object is placed perpendicular to the the principal axis of convex lens of focal length 8,the distance of the object from the lens is 12cm .Find the position &nature of the image
Answer:
v = 24 cm and inverted image
Explanation:
Given that,
The focal length of the object, f = +8 cm
Object distance, u = -12 cm
We need to find the position &nature of the image. Let v be the image distance. Using lens formula to find it :
[tex]\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}[/tex]
Put all the values,
[tex]\dfrac{1}{v}=\dfrac{1}{f}+\dfrac{1}{u}\\\\\dfrac{1}{v}=\dfrac{1}{8}+\dfrac{1}{(-12)}\\\\v=24\ cm[/tex]
So, the image distance from the lens is 24 cm.
Magnification,
[tex]m=\dfrac{v}{u}\\\\m=\dfrac{24}{-12}\\\\m=-2[/tex]
The negative sign of magnification shows that the formed image is inverted.
488 nm light passes through a single
slit. The first (m = 1) diffraction
minimum occurs at an angle of
0.559º. What is the width of the slit?
[?] x 10-5 m
Answer:
5.00
Explanation:
a sinθ=mλ
You are missing (a) so you move sinθ to the other side than solve from there.
For first diffraction, the width of the slit is [tex]5*10^{-5} m[/tex].
What is diffraction?Diffraction of light is defined as the bending of light around corners such that it spreads out and illuminates areas where a shadow is expected.
a sinθ=mλ
[tex]a = \frac{1*488*10^{-9} }{sin 0.559}[/tex]
[tex]a = 5*10^{-5} m[/tex]
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Object A and object B are moving with the same momentum. Which of the following statements must be true?
The FIRST statement on the list is the definition of momentum, so that's the one that must be true.
When two objects A and object B are moving with the same momentum then the product of their velocity and mass will be equal.
What is momentum?The momentum of any object is defined as the product of the mass of the body to the velocity of the body. So if the two bodies are having same momentum it means that the product of their masses and the velocities are equal.
Now suppose the mass and the velocity of the body A is [tex]M_A[/tex] and [tex]V_A[/tex] so the momentum of the body will be given by
[tex]P_A= M_A\times V_A[/tex]
Similarly for body B the mass and the velocity is given as [tex]M_B[/tex] and [tex]V_B[/tex] then the momentum of the body B will be given as
[tex]P_B=M_B\times V_B[/tex]
So now both body A and B are having same momentum then
[tex]P_A=P_B[/tex]
[tex]M_A\times V_A=M_B\times V_B[/tex]
Thus when two objects A and object B are moving with the same momentum then the product of their velocity and mass will be equal.
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A body weighs 160N in air and 120N when totally immersed in a liquid of relative density (R.D) 0.80. Calculate the relative density of the body.
Answer:
3.2
Explanation:
The computation of the relative density of the body is shown below:
Given that
W denotes the weight of the body in air = 160 N
ρ' denotes density of the body
V denotes volume of the body
Now weight of the body in the air is
W = ρ' V g ............................... (1)
And,
W' denotes weight of the body in liquid = 120 N
Now the force of buoyancy is
F = W - W'
= 160 - 120
= 40 N
And, ρ denotes density of liquid
The force of buoyancy is
F = ρ V g .................................(2)
Now divide equation 1 from equation 2
160 ÷ 40 = ρ' V g ÷ (ρ V g )
4 = ρ' ÷ (0.8 )
ρ' = 3.2
Why friction is called necessary evil?
Explanation:
Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. ... Hence it is considered as a necessary evil .
Explanation:
Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. ... Hence it is considered as a necessary evil .
PLEASEEEE HELP
Blue light of wavelength 435 nm
enters diamond (n = 2.42). What
is the wavelength of the light in
diamond?
(Unit = nm)
Answer:
Wavelength of light in diamond λ2 = 179.75 nm (Approx.)
Explanation:
Given:
Blue light of wavelength λ1 = 435 nm
n2 in diamond = 2.42
Find:
Wavelength of light in diamond λ2
Computation:
Since the wavelength is smaller, the frequency stays constant. The frequency of vibrations does not shift when they pass from one source to the next.
So,
n1λ1 = n2λ2
(1)(435) = (2.42)λ2
Wavelength of light in diamond λ2 = 179.75 nm (Approx.)
Answer:
180
Explanation:
got it right on acellus
-
= 49 cm²
A base of
a triangle is 20cm and the beacht
14cm. Find the area at be briangle
Answer:
=140 cm²
Explanation:
1
____ ×20x 14
2
=1
___ x base × height
is the formula have a gr8 day :)
2
12
C
6
What is the number of protons in this carbon atom?
OA. 12
OB. 6
O C. 18
OD. 24
Answer:
B. 6
Explanation:
i think... im in 7th grade and haven't really leaned this but im like 60% sure but i migjt be wrong
Answer:
your answer is B 6 protons
Explanation:
since the atomic number for carbon is 6 it also represents the number of protons and electrons
A spherical mirror used in solar furnace focuses sunlight on its principal axis at a distance 12 cm from its pole. The radius of curvature of the mirror is
20 POINTS
Answer:
R = 24 cm
Explanation:
Given that,
A spherical mirror used in solar furnace focuses sunlight on its principal axis at a distance 12 cm from its pole. It means the focal length of the mirror is equal to 12 cm
We need to find the radius of curvature of the mirror. Let it is R. We know that the relation between radius of curvature and the focal length is given by :
R = 2f
So,
[tex]R=2\times 12\\\\=24\ cm[/tex]
So, the radius of curvature of the mirror is equal to 24 cm.
Which formula is used to find an object's acceleration? q= AT-AV q= AV+ AT q= AV/AI a= A1/AV
Answer:
[tex]a=\dfrac{v-u}{t}[/tex]
Explanation:
The acceleration of an object is the rate of change of velocity. The mathematical expression for the acceleration of an object is given by :
[tex]a=\dfrac{v-u}{t}[/tex]
Where
v and u are final and initial velocities
t is time
or we can write acceleration as :
[tex]a=\dfrac{\Delta v}{\Delta t}[/tex]
Hence, this is the required solution.
3. A girl is running the 200 m dash. She starts by acceleration at 8m/s^2 for 7s. Then continues at this speed until the end of the race. How long did it take for her to complete the race?
Answer:
10.6 s
Explanation:
Given that a girl is running the 200 m dash. She starts by acceleration at 8m/s^2 for 7s. Then continues at this speed until the end of the race. How long did it take for her to complete the race?
Solution.
If she accelerated for 7s, the velocity at which she accelerated will be:
Acceleration = velocity/time
8 = V/7
Make V the subject of the formula by cross multiplying.
V = 8 × 7
V = 56 m/s
She maintains the speed through out the journey.
Speed = distance/time
Make time the subject of formula
Time = distance/speed
Time = 200 / 56
Time = 3.57s
Therefore, she will complete the race by 7 + 3.6 = 10.6 s
How do you write an article?
Answer:
Choose/Pick your topic which is required for your target audience. Do some research and collect the needed information for your selected topic. Organize all important topic related facts & stats in a logical way. Write all your reader’s needs to influence & help them. Make your views unique & specific. Read, Revise, and Repeat. Cross-check the grammatical mistakes & avoid unnecessary & repetitive lines
Hope this helps!!
Answer:
You have to choose a topic which you'd might like. And write about it. Make sure to provide lots of details and make your reasoning very strong to support your topic. Make sure to re-read and edit misinformation. Correct all grammatical errors and as such that do not make sense. Make sure to do great researching on the internet to provide lots of evidence for your chosen topic.
Just as the last passenger steps out of the elevator at the thirteenth floor, a malfunction occurs and it begins dropping toward the ground floor in free fall, Ignoring friction (and the fact that elevators are designed to avoid this type of accident), what is its downward acceleration? How fast is it moving after 2.5 s?
+10m/s²--25m/s
Explanation:
it's downward acceleration is +10ms-²
since it is falling freely under the influence of gravity
Since the elevator drops downward, that is initially from rest , u=0
so for this equation S=u + ½at²
but since u is 0 the new equation becomes S=½at²
thus from the new equation we determine the height attained after 2.5s during the fall
substituting 2.5s in the equation...
we get s to be 31.25m
then we substitute s in this equation when u=0 to get the velocity of the body
v²=u²+2as
v²=2as
v²=2(+10•31.25)
v²=625
v=25m/s
i suppose this will help
On the planet Xenos, an astronaut observes that a 1.00 m long pendulum has a period of 1.50 s. What is the
free-fall acceleration on Xenos?
Answer:
g=1.77π2xm/s2
Explanation:
T
=
2
π
√
l
g
∴
√
l
g
=
T
2
π
∴
l
g
=
T
2
4
π
2
∴
g
l
=
4
π
2
T
2
∴
g
=
4
π
2
l
T
2
g
=
4
π
2
×
1.00
1.50
2
=
1.77
π
2
x
m/s
2
Help please? I am having trouble
Answer:h I think
Explanation:
which element is a noble gas?
Find the velocity in m/s of a swimmer who swims 110m toward the shore in 72s
*show your work pls*
What will most likely happen if a light wave moves from the air into a solid? A) It will increase in wavelength. B) It will decrease in speed. C) It will increase in speed. D) It will decrease in frequency.
Answer:
it will decrease speed
Explanation:
Answer:
it's b
Explanation:
The model shows how the Sun fuses two nuclei of hellum-3 into beryllium-6. Since beryllium-6 is unstable, it will decay into smaller nuclei.
What additional product completes the model?
O A Helium-4
OB Helium-8
o C Carbon-4
OD Carbon-8
Answer:
A
Explanation:
I took the test
Having _________is the most obvious difference between a eukaryotic and a prokaryotic cell, but there are other differences as well.
a
DNA
b
Cytoplasm
c
a pulse
d
a nucleus
Prokaryotic cells don’t ____________ have like eukaryotic cells.
a
DNA
b
membrane-bound organelles
c
cytoplasam
d
brains
Prokaryotic cells are also usually around ____________ than eukaryotic cells
a
ten times larger
b
half the size
c
ten times smaller
d
twice as large
An example of an organism that is eukaryotic would be
a
bacteria cell
b
animal cell
c
archaea
An example of a prokaryotic organism?
a
plant and animal cell
b
fungi
c
bacteria
d
human cell
GIVE ME ANSWERS AND I WILL GIVE U BRAINLIEST AD 50 POINTS
Answer:
1. d. a nucleus
2. b. Membrane-bound organelles
3. c. ten time smaller
4. b. animal cell
5. c. Bacteria
Explanation:
Hope this helps... :)