If the displacement of a body is proportional to square of time state weather the body is moving with uniform velocity or uniform acceleration?
Answer:
If the displacement of an object is proportional to the square of the time taken then the body is moving with uniformly accelerated motion as it will follow Newton's second equation of motion for a particular initial velocity, which can be given by, s=ut+21at2.
• A 1200-kg car is driven through town with a speed of
15 m/s.
What is the magnitude of the car's
momentum?
1. A body undergoing Uniform motion covered 12.5km with in 2.8 min. Determine:
A. The speed of the body
B. The time to cover 0.5km
C. The distance covered in 12min
A student is creating a model of a concave lens. The diagram shows her incomplete model.
Which action would best complete her model?
A
The student should draw the light moving into the lens and then exiting in converging lines.
B
The student should draw the rays of light moving into the lens and then exiting at right angles.
C
The student should draw the rays of light moving into the lens and then exiting in a straight path.
D
The student should draw the light moving into the lens and then exiting in lines that are spreading out.
Answer:
D
Explanation:
I’m pretty sure it’s correct but I don’t really know. Just trying to pass science
Answer:
The correct answer is D trust me I did the test
When the concave lens moves in it exit by spreading out like water
A uniform beam is balanced at its midpoint. An object is placed on the beam as shown. Which force will rebalance the beam
The image of the uniform beam is missing, so i have attached it.
Answer:
Option D: 90N acting downwards, 20cm to the left of the midpoint
Explanation:
Taking moments about the pivot, for the beam to be balanced, the moments to the left of the pivot must be equal to the moments to the right of the pivot.
Thus, it also means that; anti clockwise moment = clockwise moment.
Now, from the image, the moment of the left force about the pivot is an anti clockwise moment = 60 × 30 = 1800 N.cm
Now, for the beam to be rebalanced, we need a clockwise moment to the right of the pivot that is equal to 1800 N.cm.
Thus, the clockwise moment would have to be gotten from a downward force to the right of the pivot.
From the options given, the only downward force to the right of the pivot that produces a moment equal to 1800 N.cm is;
Option D: 90N acting downwards, 20cm to the left of the midpoint
An airplane is cruising at a speed of 250 m/s. If the airplanes engines provide a forward force of 19,540 N, calculate the force of the air resistance (friction) that is acting on the plane.
A 0.0215 m diameter coin rolls up a 20.0 degree inclined plane. The coin starts with an initial angular speed of 55.2 rad/ s and rolls in a straight line without slipping. How much vertical height does it gain before it stops rolling?
Answer:
The coin will reach a vertical height of 0.027 meters before it stops rolling.
Explanation:
Let suppose that coin-ground system is a conservative system and begins at a height of zero. Since the coin is experimenting a general plane motion, which is a combination of translation and rotation. By Principle of Energy Conservation we have the following model:
[tex]K_{T}+K_{R} = U_{g}[/tex] (1)
Where:
[tex]K_{T}[/tex] - Translational kinetic energy at the bottom of the incline, in joules.
[tex]K_{R}[/tex] - Rotational kinetic energy at the bottom of the incline, in joules.
[tex]U_{g}[/tex] - Gravitational potential energy at the top of the incline, in joules.
By definitions of Kinetic and Gravitational Potential Energy we expand (1):
[tex]\frac{1}{2}\cdot I \cdot \omega ^{2} + \frac{1}{2}\cdot m\cdot R^{2}\cdot \omega^{2} = m\cdot g\cdot h[/tex] (2)
Where:
[tex]I[/tex] - Momentum of inertia of the coin, in kilogram-square meters.
[tex]\omega[/tex] - Angular speed, in radians per second.
[tex]R[/tex] - Radius of the coin, in meters.
[tex]m[/tex] - Mass, in kilograms.
[tex]g[/tex] - Gravitational acceleration, in meters per square second.
[tex]h[/tex] - Height reached by the coin, in meters.
The momentum of inertia of the coin is calculated by:
[tex]I = \frac{1}{2}\cdot m\cdot r^{2}[/tex] (3)
Then, we expand and simplify (2):
[tex]\frac{3}{4}\cdot R^{2}\cdot \omega^{2} = g\cdot h[/tex]
[tex]h = \frac{3\cdot R^{2}\cdot \omega^{2}}{4\cdot g}[/tex]
If we know that [tex]R = 0.0108\,m[/tex], [tex]\omega = 55.2\,\frac{rad}{s}[/tex] and [tex]g = 9.807\,\frac{m}{s^{2}}[/tex], then the height reached by the coin is:
[tex]h = 0.027\,m[/tex]
The coin will reach a vertical height of 0.027 meters before it stops rolling.
Small pieces of sand hitting the side of a mountain and weathering the rock is an example of what type of weathering?
Answer: This is MECHANICAL type of weathering.
Explanation:
Weathering is defined as the process by which rocks breakdown into smaller quantities due to different atmospheric and biological activities.
There are different types of weathering which include:
--> MECHANICAL WEATHERING: This type of weathering is also called physical weathering. Here, rocks are being broken down into smaller pieces but the mineral composition of the rock remains the same. This type of weathering can occur in two ways:
• By Ice wedging: this is one of the easiest ways rocks can be broken into smaller pieces. It occurs at the earth polar regions (climate that regularly cycles above and below the freezing point) and in areas of higher elevations such as the mountains. Ice wedging of rocks occurs when water seeps into cracks, it freezes and expands. This results in wedging (splitting) the rocks apart with repeated freezing.
• By Abrasion: this is another form in which mechanical weathering occurs. Abrasion occurs when strong winds carrying pieces of sand sandblast mountain surfaces. Also moving water, gravity, biological activities can cause abrasion of rock surfaces leading to its weathering.
Therefore, small pieces of sand hitting the side of a mountain and weathering the rock is an example of mechanical weathering by abrasion.
Todos los cuerpos pueden estar sobre la tierra por la fuerza de gravedad .Cuando nos caemos ,saltamos y realizamos otras actividades la fuerza de gravedad influye bastante, por lo tanto, esta fuerza la ejerce: a. El centro de la tierra b. Cada una de laas personas c. Las capas que rodean la tierra d. Todas las anteriores
Answer:
a. El centro de la tierra.
Explanation:
Se considera que la gravedad es una fuerza de atracción universal que actúa entre todos los objetos que tienen masa, energía y ocupan espacio. Por lo tanto, actúa de tal manera que une los objetos.
Además, la gravedad de la tierra hace posible que todos los objetos físicos tengan peso.
La ley de Newton de la gravitación universal establece que la fuerza de atracción (gravedad) que actúa entre la Tierra y todos los objetos físicos es directamente proporcional a la masa de la Tierra, directamente proporcional a la masa del objeto físico e inversamente proporcional al cuadrado de la distancia que separa el centro de la Tierra'y ese objeto físico.
Todos los cuerpos pueden estar sobre la tierra por la fuerza de gravedad .Cuando nos caemos ,saltamos y realizamos otras actividades la fuerza de gravedad influye bastante, por lo tanto, esta fuerza la ejerce el centro de la tierra.
How high (in meters) can a 40 N force move a load, when 395 J of work is done? (round to the nearest 10th)
Answer:
9.9 m
Explanation:
From the question given above, the following data were obtained:
Force (F) = 40 N
Workdone (Wd) = 395 J
Height (h) =?
The height can be obtained as follow:
Potential energy = mgh = Fh
395 = 40 × h
Divide both side by 40
h = 395 / 40
h = 9.9 m
Thus, the height is 9.9 m.
please answer as fast as possible
a monometer containing mercury of density p = 13.6 x 10^3 connected to a gas supply. caluclate the perssure of the gas supply
also sorry for the blury image
Explanation:
the pressure is given by P=hpg
where h is height,p is density, g is 10m/s²
thus P= 0.05m•13.6x10³•10
P=6.8x10³ Hgmm
Which household item uses radiation in a beneficial way? conventional ovens smoke detectors electric air filters computers and TV sets
Answer:
Smoke detectors
Explanation:
This is because the ionization chamber in smoke detectors uses radiation, a form of heat transfer to detect smoke.
.The NRC allows beneficial use of smoke detectors which is a radioactive material because a smoke detector has the ability to save lives . it's ability to save lives outweighs any health risk from the radiation. The smoke detector use a very minimal amounts of radioactive materials.
Answer: The household item which uses radiation in a beneficial way is the SMOKE DETECTORS
Explanation:
Radiation is a type of energy that has the ability to travel through space and penetrate materials. There are various types of radiation which include alpha, beta and gamma rays. Many uses of radiation help to ensure high quality and safety of our daily lives. A typical example is seen in smoke detectors.
Smoke detectors are devices installed in a building which serves the purpose of detecting smoke which usually is associated with fire and sounding off an alarm. The types of smoke detectors available depends on their mode of action and these include:
--> Ionization smoke detectors: These type of detector are generally more sensitive to flamming fires. They have an in built small amount of RADIOACTIVE material between two electrically charged plates, which ionizes the air and causes current to flow between the plates. When smoke enters the chamber, it disrupts the flow of ions, thus reducing the flow of current and activating the alarm. An isotope of americium which emits alpha particles is used in this type of smoke detectors and it's an example of an alpha radiation.
Therefore, the household item which uses radiation in a beneficial way is the SMOKE DETECTORS.
Four satellites are in orbit around the Earth. The heights of their four orbits
are identical. The masses of the four satellites are given in the table. For
which satellite is the gravitational pull of Earth the strongest?
A. Satellite A
B. Satellite B
C. Satellite C
D. Satellite D
The gravitational pull of Earth is stronger in satellite A
Si un ciclista se mueve a una velocidad de 5 m/s y acelera 1 m/s2, a los 10 segundos su velocidad será
Answer:
A los 10 segundos su velocidad será 15 [tex]\frac{m}{s}[/tex]
Explanation:
La aceleración de un objeto es una magnitud que indica cómo cambia la velocidad del objeto en una unidad de tiempo.
En otras palabras, la aceleración relaciona los cambios de la velocidad con el tiempo en el que se producen, es decir que mide cómo de rápidos son los cambios de velocidad:
Una aceleración grande significa que la velocidad cambia rápidamente. Una aceleración pequeña significa que la velocidad cambia lentamente. Una aceleración cero significa que la velocidad no cambia.La aceleración "a" puede ser calculada mediante la expresión:
[tex]a=\frac{vfinal - vinicial}{tiempo}[/tex]
En este caso:
a= 1 [tex]\frac{m}{s^{2} }[/tex]vfinal= ?vinicial= 5 [tex]\frac{m}{s}[/tex]tiempo= 10 sReemplazando:
[tex]1\frac{m}{s^{2} }=\frac{vfinal - 5\frac{m}{s} }{10 s}[/tex]
Resolviendo se obtiene:
1 [tex]\frac{m}{s^{2} }[/tex] *10 s= vfinal - 5 [tex]\frac{m}{s}[/tex]
10 [tex]\frac{m}{s}[/tex] = vfinal - 5 [tex]\frac{m}{s}[/tex]
10 [tex]\frac{m}{s}[/tex] + 5 [tex]\frac{m}{s}[/tex] = vfinal
15 [tex]\frac{m}{s}[/tex] = vfinal
A los 10 segundos su velocidad será 15 [tex]\frac{m}{s}[/tex]
Which statement describes an atomic nucleus? *
1 point
An atomic nucleus is negatively charged.
An atomic nucleus has no electrical charge.
An atomic nucleus consists of mostly empty space.
An atomic nucleus contains most of the atom’s mass
Answer:
An atomic nucleus contains most of the atom’s mass
Explanation:
The first and second answer choices are incorrect because the nucleus has a charge -- but it is positive due to the presence of protons.
The third answer choice is incorrect because the nucleus is extremely dense and packed with all of the protons and neutrons of the atom.
The fourth answer choice is correct because protons and neutrons contain the mass of the atom.
Answer:
An atomic nucleus contains most of the atom’s mass
Explanation:
Hope this helps
our ancestors are our guides?
Answer:
yes
Explanation:
we can clearly say that our ancestor are our guide.
Because of they give us different knowledge about evolution of life and etc.
Please help me fr fr !
Answer:
Explanation:
If you are pushing a box toward your friend with a force of 20 N, and your friend is pushing the box toward you with a force of 30 N, what will happen to the box?
Answer : the box will move backwards with a force 10 N
Explanation :
F1 = 20 N
F2 = 30 N
F = F2 - F1 = 30 - 20 = 10 N
What is the law of inertia? Give an example of inertia in action.
Answer:
The law of inertia is another name for Newton's first law. Newton's first law states that an object will not change its motion or direction unless a force acts on it. An object at rest will stay at rest and an object in motion will stay in motion if there isn't any force acting on them.
Example: When a car uses its brakes to stop, you sometimes feel like you are sliding forward. That is because the inertia keeps you moving forward, even though the car stopped.
Explanation:
Answer:
Law of inertia is sometimes called Newtons First law of motion.
Newtons first law of motion states that"A body will continue to its state of rest or motion unless external force acted upon it.
When a closed loop of wire experiences a changing magnetic field a voltage and therefore current is produced. This is the basis for...
Answer: The answer is an electric generator
Explanation:
I just took the quiz and I thought it was an electric motor but the correct answer was an electric generator.
This concept of closed loop wire experiences a changing magnetic field and flowing of current is related to the Faraday's law of electromagnetic induction.
Why there is a current flow whenever there is a change in magnetic field in a closed loop of wire?When ever there is a bar magnet inside the wire and the magnet moves relative to the wire there will be an EMF generated in the coil and current can be flown.
similarly by reversing the process if the magnet remains stationary and the coil is moved then again the emf and the current generated in the coil which is called as electromagnetic induction.
This is the basic principle of transformers,generators,motors .
Thus when a closed loop of wire experiences a changing magnetic field a voltage and therefore current is produced.
To know more about electromagnetic induction follow
https://brainly.com/question/26334813
answer this plsss
A mobile phone operates at 900 MHz.
What wavelength does it use?
Answer:
The wavelength = 0.3333 meters at 900 MHz, therefore, = /4 = 0.08333 meters.
a reaction occurs in which carbon combines with sulfur to form carbon disulfide is this a chemical reaction or a nuclear reaction and how do you know
Answer:
a chemical reaction where electrons mix.
Explanation:
A nuclear reaction is when atomic nuclei combine, forming a new chemical element
A chemical reaction occurs when electrons from the last layer of atoms mix, forming molecules that have the same chemical elements as the reactants.
According to these definitions
C + 2 S → CS2
in a chemical reaction where electrons mix.
Answer:
This is a chemical reaction, because only the electrons were rearranged.
what is comma please plz me.!!
Answer:
A comma.....
Explanation:
Looks like this (,), and can be used if you have run-on sentences.
I hope this helps :)
hi
what's up
wrud
hmm
hmm
TTC
The TTC subway train in Toronto starts from rest at the Kipling station and accelerates at a
rate of 4.0 m/s for the first 6.0 s. The train then maintains a constant speed for the next
45.0 s.
(a)
(B)
Calculate the train's velocity after 6.0 s have elapsed.
Determine the displacement of the train after 51.0 s of travel.
If continuous spectrum light from a star passes through a cool, low-density gas on its way to your telescope and spectroscope, ____ spectrum on the continuous spectrum results. If continuous spectrum light from a star passes through a cool, low-density gas on its way to your telescope and spectroscope, ____ spectrum on the continuous spectrum results. a bright (emission) line a dark (absorption) line continuous
Answer:
a dark (absorption) line.
Explanation:
A star is a giant astronomical or celestial object that is comprised of a luminous sphere of plasma, binded together by its own gravitational force.
It is typically made up of two (2) main hot gas, Hydrogen (H) and Helium (He).
Light wave can be defined as an electromagnetic wave that do not require a medium of propagation for it to travel through a vacuum of space where no particles exist.
A telescope can be defined as an optical instrument or device which comprises of a curved mirror and lenses used for viewing distant objects i.e objects that are very far away such as stars and other planetary bodies.
If continuous spectrum light from a star passes through a cool, low-density gas on its way to your telescope and spectroscope, a dark (absorption) line spectrum on the continuous spectrum results, which ultimately implies that the color is being absorbed and the absorption of specific frequencies of light by a hot gas.
SCIENCE<3:: will give brainliest! :)
Answer:
Option two
Explanation:
im smort
Answer:
I think it's B. there is a cold air mass pushing warm air mass up and replacing it over San Francisco
An object has a kinetic energy of 50 J and a velocity of 5 m/s, what is the mass of the object?
Answer: 4 kg
Explanation:
Ke=1/2MV^2
plug in the kinectic energy and solve for M
50=1/2(M) (5^2)
M= 4
I have an atomic mass of 108. Who am I?
What role does the sun play in driving the water cycle in Antarctica
Answer:
the inner regions of antarctica gets only about 2 inches of precipitation per year. the winds here blow up snow from the land and put it into the atmosphere, which is part of the water cycle. and the sun helps out, too, causing sublimation to occur, which causes snow to evaporate directly into water vapor gas.
Explanation:
good luck, hope this helps :)
have a nice day !!
Explain, step by step, how an electrical current is generated in the electrocytes.
Answer:
Hello your question is quite Vague hence I will provide you with a general knowledge answer
answer :
Place an electrode in an electrolyte solutionApply a voltage source ( Dc voltage )Movement of ions from the cathode to the anode of the electrode will begin The movement of ions brings about Electrical currentExplanation:
Electricity is generated in electrolytes through the following steps :
Place an electrode in an electrolyte solutionApply a voltage source ( Dc voltage )Movement of ions from the cathode to the anode of the electrode will begin The movement of ions brings about Electrical currentIons are electrically charged atoms that are either positive or negative ( i.e. lost or gained an electron )