Answer:
the potential energy is 114 J.
Explanation:
Given;
total mechanical energy, E = 400 J
kinetic energy, K.E = 286 J
The potential energy is calculated as follows;
E = K.E + P.E
where;
P.E is the potential energy
P.E = E - K.E
P.E = 400 J - 286 J
P.E = 114 J
Therefore, the potential energy is 114 J.
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
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
Light waves Group of answer choices are not electromagnetic radiation. do not require a medium. can not travel in a vacuum. do not travel in straight lines from the source.
Answer:
do not require a medium
Explanation:
Light waves can be regarded as electromagnetic waves and it transverse in nature, no medium material is required to pass through. Light wave can travel through vacuum and it's ray can travel in straight lines even from point source. Light convey energy in perpendicular direction to electric field as well as magnetic field.
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 .
Please I really need this !! Potassium loses electrons when it reacts with oxygen. Which statement is true of potassium in this reaction?
A. It reduces.
B. It undergoes synthesis.
C. It undergoes redox.
D. It oxidizes
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
If a chemical reaction has a AH value of -125 kJ, it would be considered what?
A. an exothermic reaction
B. a reaction that absorbs energy
C. an endothermic reaction
D. A reaction that probably gets cold
exothermic
Explanation:
negative means it's losing energy
what does heat trapped by pollution cause?
A. Acid rain
B. Decomposition
C. Greenhouse effect
Answer:
C. Greenhouse Effect
Explanation:
The greenhouse effect is caused by heat trapping pollution in the atmosphere.
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
Which element is represented by the atomic model below?
P:10
N:10
A. calcium
B. helium
C. neon
D. oxygen
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... :)
What are two ways fission is used in the real world.
Answer:
germ cleaning
and getting up cooking grease
Explanation:
Research and define pressure, as it relates to air or water pressure.
Answer:
PRESSURE is a force exerted by the substance per unit area on another substance.
The key difference between water pressure and air pressure is that one is made up of water and the other is made up of air. Both air pressure and water pressure are based on and follow the same physical principals.
Explanation:
A 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:
A runner of 60kg accelerates at 2.0 m/s at the start of race calculate the force provided from her legs
Answer:
120 kgm/s
Explanation:
Force= mass× acceleration
= 60kg × 2.0m/s
= 120 kgm/s
HOW TO ANSWER THIS QUESTION PLEASE
Answer:
radioactive decay is a random processuse long tongsExplanation:
Quantum theory has taught us that virtually everything to do with the nature of matter in the universe is a random process. The decay of atomic nuclei is something that makes that randomness "visible" with appropriate instrumentation. As such, the rate of decay will vary over the "short" term. Consequently, it is not surprising to see a variation of a few counts in an activity measurement over a period of a few minutes.
__
Safety with respect to radioactive materials involves staying as far away from them as possible. The use of long tongs for handling would be appropriate.
Answer:
Radioactive decay is a long proxyUse long tongs↔ for safety precautions the scientist should used this upon working with radioactive materials in a laboratory.
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 partThe ratio of the speed of light in a medium to the speed of light in a vacuum
is called its:
A. angle of incidence
B. Snell's Law
C. angle of refraction
D. refractive index
Answer:D.Refractive Indez
Explanation:
It is usually expressed the other way: the ratio of the speed of light in a vacuum to the speed of light in a medium. In that case, it is called the "index of refraction".
You're going for "refractive index", but you've got the ratio flipped over.
Calculate the first and second velocities of the car with three washers attached to the pulley, using the formulas
v1 = 0.25 m / t1, and
v2 = 0.25 m / (t2 – t1)
where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. Record these velocities, to two decimal places, in Table E.
What is the first velocity of the car with three washers at the 0.25 meter mark?
m/s
What is the second velocity of the car with three washers at the 0.50 meter mark?
m/s
Answer:
0.19 and 0.45
Explanation:
edge
The first and second velocities of the car are [tex]0.25/t_1[/tex] and [tex]0.50/t_2[/tex]respectively.
What is velocity?The velocity of an object is defined as the product of the distance travelled in a given direction and the time required to travel that distance. The velocity is expressed mathematically as,
v = d/t
Here, d represents the travelled distance.
And t is the typical amount of time needed to go the distance.
Given,
The value of the first distance is, d1 = 0.25 m.
The value of the second distance is, d2 = 0.50 m.
Then the first velocity of the car at 0.25 m is,
[tex]v_1 = d_1/t_1\\v_1 = 0.25 / t_1[/tex]
Thus,[tex]t_1[/tex] denotes the first distance's typical time.
The second velocity of the car with three washers at the 0. 50 m mark is
[tex]v_2 = d_2/t_2\\v_2 = 0.50 /t_2[/tex]
Here, [tex]t_2[/tex] stands for the second distance's typical time.
Thus, the first and second velocities of the car are [tex]0.25/t_1[/tex] and [tex]0.50/t_2[/tex]respectively.
Learn more about Velocity, here:
brainly.com/question/25796948
#SPJ2
does frequency of the sound affect speed of sound
Answer:
One of the more important properties of sound is that its speed is nearly independent of frequency. ... Therefore, the relationship between f and λ is inverse: The higher the frequency, the shorter the wavelength of a sound wave. The speed of sound can change when sound travels from one medium to another.
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
Write 3 rules that describe the possible behaviors that occur when objects with different charges are brought close together
Explanation:
1. attract
2.repel
3. no effect
please tell what is energy
Answer:
the capacity to do work is called energy
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
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
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.
Learn more about gene mutation here:
https://brainly.com/question/19461188
How do you get DC current and AC current? from a generator?
Answer:
They do that by converting rotating mechanical energy into electrical power. Portable generators use an engine—typically running on gasoline, diesel, or propane, to turn an alternator which produces alternating electrical current or AC.
I need help so bad pls pls help
Answer:
I think it is protection
Answer:
I think it might be PROTECTION but i not sure for a fact
Sorry if i get it wrong ;]
Explanation:
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:
A high diver dives off a platform and strikes the water 1.857 seconds later. Ignoring air resistance, how fast is he traveling as he strikes the water in m/s?
Answer:
The (vertical) speed of the driver as he strikes the water is approximately 18.22 m/s
Explanation:
From the parameters given in the question, we have;
The time after which the driver strikes the water after he drives off a platform, t = 1.857 s
Let 'v' represent the vertical speed of the driver
We can find the vertical speed of the vehicle as it strikes the water as follows;
v = u + g·t
Where;
v = The final vertical velocity of the driver
u = The initial vertical speed of the driver = 0 m/s
g = The acceleration due to gravity ≈ 9.81 m/s²
t = The time of motion = 1.857 seconds
Therefore, we have;
v = 0 + 9.81 m/s² × 1.857 s = 18.21717 m/s
Therefore;
The vertical speed of the driver as he strikes the water, v ≈ 18.22 m/s