Answer:
Mass of man (m1) = 60kg
Initial velocity of man (u1) = 18 km/h=18x5/18=5m/s
Final velocity of man (v1) = (v2) = v
Mass of car (m2)= 100kg
Initial velocity of car (u2) = 0 (as it is in rest)
Final velocity of car (v2) = v
According to law of conservation of momentum,
m1u1 +m2u2 = m1v1 + m2v2
60x5 + 100x0 = 60 x v + 100 x v
300+0 = 160v
v = 300/160
v = 1.875 m/s
The work done in lifting a brick of mass 2kg through a height of 5m above the ground will be
(A)2.5J
(B)10J
(C)50J
(D)100J
Answer:
D. 100 J
Explanation:
Given
Mass (m) = 2 kg
Height (h) = 5 m
Acceleration due to gravity (g) = 10 m/s²
Now
Work done(W)
= m * g * h
= 2 * 10 * 5
= 100 Joule
Hope it will help :)❤
The work done in uplifting a brick having a mass of 2kg along with a height of 5m above ground level would be:
D). 100 J
Given that,
Mass of the brick [tex]= 2Kg[/tex]
Height of the brick [tex]= 5m[/tex]
As we know,
Work Done (W) [tex]= mgh[/tex]
where
m = Mass
g = Acceleration due to gravity
h = height
A.T.Q.
By substituting the given values, we get;
[tex]Work Done (W)[/tex] [tex]= 2[/tex] × [tex]10[/tex] × [tex]5[/tex] (taking [tex]g = 10 m/s^2[/tex])
[tex]= 100 J[/tex]
Thus, the work done is 100 J and hence, option D is the correct answer.
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1. What is the speed of an object and the direction it is moving?
Answer:
Velocity
Explanation:
Define homogeneous mixtures and give 3 examples.
ASAP please 25 points?
Answer:
Homogeneous mixtures may be solids, liquids, or gases. Examples include steel, wine, and air. A homogeneous mixture is a solid, liquid, or gaseous mixture that has a uniform composition. No matter where you sample the mixture, the amount and type of components is the same.
Explanation:
Help of sciencenotes .org
Answer:
A homogeneous mixture has components evenly distributed throughout and a uniform appearance.
Salt Water
Blood
Air
Explanation:
Fill in the blank to complete the statement.
Electric potential difference is also known as _________.
Answer: Voltage
Explanation: EDGE 2020
Answer: Voltage
Explanation:
4. You run from your house to a friend's house that is 3 miles away. You then walk
home.
What was your displacement?
A tuna traveling at 12 m/s starts to decelerate steadily. It comes to a complete stop in 10 seconds. What is its acceleration?
Answer:
a = -1.2 m/s^2
Explanation:
Vi = 12 m/s
Vf = 0 m/s
t = 10 s
Plug those values into the following equation:
Vf = Vi + at
0 = 12 + 10a
---> a = -1.2 m/s^2
Which of these is NOT a line on the tennis court?
Base line
Service line
Side line
Front line
Answer:
The answer would be Front Line
The base line, service line, and the side lines are the part of the tennis court however front line is not a part of the tennis court. Thus, the correct option is D.
What are the specifications of Tennis Court?
A tennis court is a 78ft long court, with a service line of 21ft from the net. The courts for singles tennis matches are 27ft wide in dimension, while the doubles matches courts are 36ft wide. The total playing area in tennis for a singles court is 2,106ft² and 2,808ft² for a doubles court.
The basic and important parts of a tennis court in both singles and doubles are the baseline, the center mark, the sidelines, the service lines, and the service boxes. The baseline is the boundary line at the ends of the tennis court, and the sidelines are the lines which mark the boundary line between in-bounds and out-of-bounds for both singles and doubles play.
Therefore, the correct option is D.
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What is an object in the classroom that has a loose end? Please help!!
Answer:
student's tie cause if the tie is too tight then no need of hanging to fan.
An example of an object in a classroom that has a loose end could be a frayed electrical cord on a piece of electronic equipment such as a computer or a lamp.
What is a classroom?A classroom is an educational circumstance in an academic institution where important personalities are developed and career-building skills are learned.
A frayed electrical cord on a piece of electronic equipment, such as a computer or a lamp, is an example of a loose end in a classroom.
Over time, the cord can become worn or damaged and the outer protective layer can start to come apart, leaving exposed wires and a "loose end" that can be potentially dangerous if not addressed.
This loose end can become a safety hazard as it increases the risk of electrical shock or fire. It is important to address any loose or frayed cords as soon as they are noticed and either repair or replace the equipment to ensure a safe learning environment for students and teachers alike.
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A common design for a spotlight uses a lens and a mirror, combined with a gas-discharge lamp, to project a powerful parallel beam of light. Where are the lens and mirror positioned?
Answer:
Explanation:
For answer please see the image attached .
The mirror reflects the light while the lens allows the light to pass through it. The lens and mirror are positioned parallel and opposite each other.
What is the difference between the lens and mirror?The basic difference between the lens and mirror is that mirror reflects the light while the lens allows the light to pass through it. Both are optical instruments but their laws are different.
The lens and mirror are positioned parallel and opposite each other. From the above conditions, it is observed that first, the light gets passed through the lens.
After it passes through the light got reflected. As the light reflected the mirror it again passes through the lens and converts the distributed or parallel lights into a single beam of light.
The single beam of light is known as the spotlight.
Such types of design for a spotlight use a lens and a mirror, combined with a gas-discharge lamp, to project a powerful parallel beam of light.
Hence the lens and mirror are positioned parallel and opposite to each other.
To learn more about the lens and mirror refer to the link;
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10.(a) At what water depth is the pressure twice atmospheric pressure?
(b) What is the pressure at the bottom of the 11-km-deep in the ocean? Take
atmospheric pressure as 100 kPa and the density of water as 1000 kg/m3.
Answer:
Answer. Pressure under water is given by the sum of atmospheric pressure and pressure of fluid. Thus, depth in water at which pressure will be equal to twice the atmospheric pressure is 10.2 m.
Explanation:
On earth, how can you tell up from down
1.by looking at a paper map
2.by using your cell phone gps
3.in reference to the earth
4.by standing on a scale
Answer:
I think is 3 I am not sure
What is point c called?
During which phase is the moon not visible?
A.full moon
B.waxing crescent
C.new moon
D.first quarter
Answer:
new moon phase
Explanation:
During the new moon phase, the moon is not visible. Sometimes it can be detected by noting the visible absence of the stars that it blocks. Additionally, during new moon, sometimes enough light is reflected off the surface of the Earth that the disk of the moon is faintly visible.
Answer:
Everyone knows new moon is NOT visible
Explanation:
If you're doing an assignment of the moons, I hope this helps.
And there you have it! :]
Also, a new moon is the only phase that is not visible, It's not even visible during the day time.
HELP ASAP!!
In 3-4 sentences, briefly summarize how our solar system formed.
Answer:
Explanation:
Our solar system is formed by a dust storm, which created the planets. This info is grabbed by NASA, and people believe this is how the Solar System is formed. The sun is formed like this too.
Answer:
Well a lot of people believes in evolution. But in fact evolution is actually clearly impossible because how can dead which is Non-Living bacteria and dirt make something alive like living. And anyway there's a lot of thing's in nature that shows there is a creator. Like how does bees know when there honey comb is to warm to start fanning there wings to cool the honey comb down? And like human beings for example we didn't generate from aps. Yes there smart like us and sorta human like but the way our bodies are designed is wayyyyy to complicated. For example our brain its a computer we dont shut it on and off it's always running constantly and we dont have to worry about turning our brain on or off. I know this wasent what u have asked but i made me think about it and also someone created the universe because the whole universe hangs on nothing but they stay aligned. So this shows that there is a creator though.
Explanation:
Hope this helps you in some way of form. :)
1. What is voltage, and what is its relationship to amperage and power?
Answer:
Electric frying
Explanation:
To fry food on a old broken down electric oven
A sports car starts at rest at the starting marker then picks up speed, then passes the finish marker in 4.1 seconds. The markers are separated by 120 meters. What is the car's speed at the second marker?
Answer:
S=29.298m/s
Explanation:
Use S=d/t
So, S=120m/4.1s= 29.298m/s
A man stands in front of a vertical plane mirror which is fixed on a
wall as shown in the diagram below. The image formed by the
mirror is also shown.
The man looks at the image of his feet.
a. Complete the ray diagram to show how the man is able to see the
image of his feet in the mirror.
b. What is the purpose of the normal line in the diagram?
c. State which angle does x represent.
d. What's the type and direction of the image formed by the mirror?
Answer:
a) ray horizontal and ray leaves his feet
b) The normal line respect to which the angles are measured,
c) The angle x is the reflected angle
d) virtual image, right image
Explanation:
a) To complete the rays, you must draw a horizontal ray at the height of the man's head, this ray touches the mirror perpendicularly, therefore it bounces in the same direction.
The other ray leaves his feet and touches the mirror at one point, it is reflected with the same angle, by the law of reflection and reaches the eyes of man, the brain creates an extension of this ray and at the point of the floor creates the image point.
b) The normal line is a line perpendicular to the surface with respect to which the angles are measured,
c) The angle x is the reflected angle, which is equal to the incident angle according to the law of reflection
d) The image is formed by the prolongation of the rays of light, therefore it is a virtual image and as it has the same direction of the man it is a right image
a force 4000 n accelerates a car of mass 800 kg from rest to 20 ms how far does the car travel while the force is acting?
Answer:
d = 40 m
Explanation:
Given that,
Force, F = 4000 N
Mass of a car, m = 800 kg
Initial velocity, u = 0 (at rest)
Final velocity, v = 20 m/s
We need to find the distance traveled. Force acting on a car is given by :
F = ma
Where
a is the acceleration of the car.
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{4000}{800}\\\\a=5\ m/s^2[/tex]
Let it has traveled d distance. Using third equation of motion.
[tex]v^2-u^2=2ad\\\\d=\dfrac{v^2-u^2}{2a}\\\\d=\dfrac{(20)^2-(0)^2}{2\times 5}\\\\d=40\ m[/tex]
So, the required distance is equal to 40 m.
Arthur conducts a controlled experiment several times. The results of each test show that his hypothesis is not supported. Which of these best describes why
this hypothesis is still valuable?
Hello. You did not inform the experiment that Arthur is conducting, which makes it impossible for your question to be answered accurately. However, I will try to help you in the best possible way.
The hypothesis is an assumption that is made before the experiment is carried out. This hypothesis is formed with the observation of some phenomenon of nature where the researcher believes that two or more elements interact to form a result. In this case, the experiment is carried out to determine whether the assumption, that is, the hypothesis is false or true. In the event that an experiment determines that the hypothesis is false, two things may have occurred: (a) the experiment was set up, or analyzed incorrectly, (b) the elements tested have no relation to the observed phenomenon.
if the reference point changes, the
_____ of position changes, but the actual position does not change
Answer:
description
Explanation:
Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point.
This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.
Mathematically, the motion of an object is described in terms of acceleration, time, distance, speed, velocity, displacement, position, etc.
A reference point refers to a location or physical object from which the motion (movement) of another physical object or body can be determined.
For example, a point on a map is considered to be a reference point because it represents the starting point of an object or person in motion.
If the reference point changes, the description of position changes, but the actual position does not change.
Answer:
description
Explanation:
Hope this helps
What is the abbreviation for the SI unit for electric potential?
V
J
C
U
The abbreviation for the SI unit for electric potential is V.
What is Electric potential?This is defined as the amount of work energy needed to move a unit of electric charge from one point to another in an electric field.
Electric potential = Energy/ Charge
The unit of electric potential is either Joules per coulomb or Volts(V) which makes option A the most appropriate choice.
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Answer:
V
Explanation:
a bee whispered me the answer
HELP ASAP!
1) Under what conditions would you expect to see a full moon?
2) Under what conditions would you expect to see a new moon?
Answer:
The full cycle of Moon phases takes on average 29 nine days and 12 hours for 8 phases when i name the “minimal moon” as a distinct phase (it vary a bit over and under that because Earths orbit is elliptical).
That gives us 2 half cycles of 4 phases each:
Minimal Moon. The moon show hardly any crescent and the bit of crescent it do show is nearly horizontal. Earth, Moon and Sun is near conjunction (on the same line, there may be a solar eclipse in mid phase).
New Moon (aka Waxing Crescent). The crescent grows and becomes more vertical.
Half moon (aka First Quarter) . The crescent is now halfway to full moon.
Waxing Gibbous. We see the moon as convex on both sides, and growing.
Full moon. We see the moon as circular ( again near a conjunction, there may be a lunar eclipse in mid phase)
Waning Gibbous. We see the Moon shrinking again.
Third quarter (the ‘other’ half moon, but now it is the other half of the Moon we can see).
Waning Crescent (shrinking crescent)
‘Waxing’ means growing and ‘Waning’ means shrinking. ‘Gibbous’ means fat, and now the cycle start over with:
Minimal Moon. again
Each phase takes 29.5/8 days. that is 3 days and 16.5 hours
So to answer your question: New Moon to Full Moon is 3 phases. 9 days + 49.5 hours = 11 days and 1.5 hours
The naming of the moon phases is based on human eyesight estimates. That is why I felt a need to introduce the ‘Minimal Moon’ phase to make it Mathematically consistent.
PLEASE MARK THE BRAINILEST, THANK YOU
An inclined plane creates a mechanical advantage of 5. What would the input force need to be to create an output force of 20 N?
A. 15 N
B. 100 N
C. 4 N
explain electrostatic force
Answer:
Electrostatics is a branch of physics that studies electric charges at rest. Since classical physics, it has been known that some materials, such as amber, attract lightweight particles after rubbing. The Greek word for amber, or electron, was thus the source of the word 'electricity'.
What is the kinetic energy of a
54 kg person, diving into a pool
at a speed of 30 m/s?
Answer:
Explanation:
Formula
KE = 1/2 m v^3
Givens
m = 54 kg
v = 30 m/s
Solution
KE = 1/2 54 * 30^2
KE = 1/2 54 * 900
KE = 27 * 900
KE = 24300 Joules
How do you increase the potential energy between two south magnetic
poles?
Answer:
A south pole of one magnet can approach the north pole of another. The magnetic fields are aligned. This makes an attractive force between the two magnets. The farther apart they are, the higher their potential energy.
11. What is the wavelength in nanometers of the most energetic violet light?
Answer:
410 nanometers
Violet light is electromagnetic radiation with wavelengths of 410 nanometers and red light has a wavelength of 680 nanometers. The nanometer is a unit of distance in the metric scale and is abbreviated as nm. One nanometer (nm) equals one thousand millionths of a meter (m) or 1 nm = 10-9 m.
Explanation:
Hope it helps! Correct me if I am wrong :>
Answer:
Using my searching skills, I have came to the conclusion that the most energetic violet light wavelength is 380nm.
which hand is negatively charged?
What is the equivalent resistance between terminals A and B, measured in ohms?
Answer:
c. 0.80
Explanation:
they will choose the path that has not resistance
A wave has a wavelength of 4.9 m and a velocity of 9.8 m/s. The medium through which this wave is traveling is then heated so that the velocity is doubled. If the frequency remains constant, what is the wavelength of the heated wave? 2.5 m 9.8 m 14.7 m 19.6 m
Answer:
the wavelength is 9.8 meters
Explanation:
We can use the relationship:
Velocity = wavelenght*frequency.
Initially we have:
wavelenght = 4.9m
velocity = 9.8m/s
then:
9.8m/s = 4.9m*f
f = 9.8m/s/4.9m = 2*1/s
now, if the velocity is doubled and the frequency remains the same, we have:
2*9.8m/s = wavelenght*2*1/s
wavelenght = (2*9.8m/s)*(1/2)s = 9.8 m
Answer:
9.8
Explanation: