Answer:
i. rubbing the material against a magnet
ii. placing the material in a magnetic field of opposite polarity
iii. placing the material near a strong magnet
Explanation:
Ferromagnetic materials are majorly metals which can be easily attracted by a magnet. ferromagnetic materials are made up of domains, behaves as minute pieces of magnet. They can be rearranged to align when under the influence of an external magnetic field.
The alignment of the domains in a ferromagnetic material can be caused by either of the following: rubbing the material against a magnet, placing the material in a magnetic field of opposite polarity, placing the material near a strong magnet.
Answer:
B, D, E
Explanation:
edg2020
if the relative density of a liquid is 0.34 what is the density of the liquid
Answer:
340 kg/m³
Explanation:
[tex]Relative density \: = \frac{density \: ofsubstance}{density \: of \: equal \: volume \: ofwater} [/tex]
density of water = 1000 kg/m³
density of the liquid = 0.34 × 1000
= 340 kg/m³
a disc starts from rest with an angular acceleration completes 10 revolutions in 2 seconds. the time taken by it to complete 10 more revolution from that instant is
Starting from rest, the disc completes [tex]\theta[/tex] revolutions after [tex]t[/tex] seconds according to
[tex]\theta=\dfrac\alpha2t^2[/tex]
with angular acceleration [tex]\alpha[/tex]. It completes 10 rev in 2 s, which means
[tex]10\,\mathrm{rev}=\dfrac\alpha2(2\,\mathrm s)^2\implies\alpha=5\dfrac{\rm rev}{\mathrm s^2}[/tex]
Find the time it takes to complete 20 rev with this acceleration:
[tex]20\,\mathrm{rev}=\dfrac12\left(5\dfrac{\rm rev}{\mathrm s^2}\right)t^2\implies t=\sqrt8\,\mathrm s\approx2.83\,\mathrm s[/tex]
so it takes approximately 0.83 s to complete 10 more rev.
A wind blows at 100 km / h from the east. An aircraft points due north and sets off. In still air its speed is 150 km / h. What will the aircraft's actual velocity be?
Answer:
180.28 km/h
Explanation:
Let north and south represent the positive and negative y axis and east and west represent the positive and negative x axis.
Given;
Velocity of wind vx= 100 km/s
Velocity of aircraft in still air vy = 150 km/s
The resultant velocity Vr is;
Vr = √(vx^2 + vy^2)
Vr = √(100^2 + 150^2)
Vr = 180.2775637731 km/h
Vr = 180.28 km/h
Un automovil circula a 126km/h por una autopista. Su conductor observa que a 150 m delante de el, se encuentra un árbol caído que ocupa toda la calzada. Inmediatamente presiona los frenos con una aceleración de -3,5 m/s². Determinar si logra evitar el choque.
Answer:
El conductor no puede evitar el choque.
Explanation:
Primero, convierta la velocidad del conductor a m / s:
1 km/h = 0.277778 m/s
126 km/h = 126 * 0.277778 = 35 m/s
La velocidad del automóvil es de 35 m / s.
El conductor presiona los frenos con una aceleración de -3.5 m / s² para evitar un choque a 150 m por delante.
Veamos qué distancia se moverá el automóvil después de que comience a desacelerar.
Utilizaremos una de las ecuaciones de movimiento lineal de Newton:
[tex]v^2 = u^2 + 2as[/tex]
donde v = velocidad final = 0 m / s (el automóvil debe detenerse)
u = velocidad inicial = 35 m / s
a = aceleración = -3.5 m / s².
s = distancia recorrida
Por lo tanto:
[tex]0 = 35^2 + (2 * -3.5 * s)\\\\=> 1225 = 7.0s\\\\s = 1225 / 7 = 175 m[/tex]
Esto significa que el automóvil se detendrá a 175 m.
Por lo tanto, a esa velocidad y aceleración, el conductor chocará contra el árbol caído porque el automóvil no podrá detenerse antes de alcanzar la posición del árbol.
Is Einstein's equation E=mc^2 is applicable on our earth if it is not why?is it applicable in space can a body moves through speed of light
◦•●◉✿hello friend ur answer✿◉●•◦
◦•●◉✿What does E mc2 actually mean?
E = mc2. It's the world's most famous equation, but what does it really mean? "Energy equals mass times the speed of light squared." On the most basic level, the equation says that energy and mass (matter) are interchangeable; they are different forms of the same thing.✿◉●•◦
What is mean by physical quantity?
Answer:
Anything that can be measured is called a physical quantity. It is described with the help of magnitude and the unit. There are two types
1) Base quantity
2) Derived Quantity
Answer:
A physical quantity is the quantity that can be measured directly or indirectly and consists of a magnitude and a unit. Mass, length, time, density, temperature etc are some examples of physical quantities. Happiness, sadness etc cannot be measured. So, they are not physical quantities. We cannot find the exact value of any physical quantity without measurement.
There are two types of physical quantity. They are:
Fundamental quantityDerived QuantityHope this helps...
Good luck on your assignment...
A 22.8 kg rocking chair begins to slide across the carpet when the push reaches 57.0 N. What is the coefficient of static friction?
Answer:
0.255
Explanation:
The following data were obtained from the question:
Force (F) = 57 N
Mass (m) = 22.8 Kg
Coefficient of static friction (µ) =...?
Next, we shall determine the normal reaction (R). This is illustrated below:
Mass (m) = 22.8 Kg
Acceleration due to gravity (g) = 9.8 m/s²
Normal reaction (R) =?
R = mg
R = 22.8 x 9.8
R = 223.44 N
Finally, we can obtain the coefficient of static friction (µ) as follow:
Force (F) = 57 N
Normal reaction (R) = 223.44 N
Coefficient of static friction (µ) =...?
F = µR
57 = µ x 223.44
Divide both side by 223.44
µ = 57/223.44
µ = 0.255
Therefore, the coefficient of static friction (µ) is 0.255.
Answer:
.255
Explanation:
I'm also on acellus and it's the right answer
8. what force will exert apressure of
50000 PA
0.5 meter
Square ?
Answer:
25000 N
Explanation:
[tex]force \: = pressure \times area \\ = 50000 \times 0.5 \\ = 5000 \times 5 \\ = 25000 \: N[/tex]
why why scientists uses atomic watches?
Answer:
Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
The springs in a car’s suspension have a spring constant of 50 000 N/m. The elastic potential energy store is 0.025 J. Calculate the extension of the springs.
Answer:
1 mm
Explanation:
E = ½ kx²
0.025 J = ½ (50,000 N/m) x²
x = 0.001 m
x = 1 mm
Samuel applies a horizontal force of 35.0 N to a sleigh over a distance of 1.50 m along a level surface. Calculate the work done on the sleigh by samuel. show your work.
Answer:
52.5 J
Explanation:
Work done (W) is the product of the force (F) applied on a body and the distance (s) moved in the direction of the force.
i.e W = F × s
It is a scalar quantity and measured in Joules (J).
Given that: F = 35.0 N and s = 1.50 m, then;
W = F × s
W = 35.0 × 1.5
= 52.5 J
Therefore, the work done on the sleigh by Samuel is 52.5 J.
How do you calculate the speed of a 3.1eV photon and a 3.1eV electron?
Explanation:
We need to find the speed of a 3.1eV proton and a 3.1eV electron.
For proton, using conservation of energy such that,
[tex]\dfrac{1}{2}m_pv_p^2=eV\\\\v_p^2=\dfrac{2eV}{m_p}\\\\v_p=\sqrt{\dfrac{2eV}{m_p}}[/tex]
[tex]m_p[/tex] is mass of proton
[tex]v_p=\sqrt{\dfrac{2\times 3.1\times 1.6\times 10^{-19}\ J}{1.67\times 10^{-27}\ kg}}\\\\v_p=2.43\times 10^5\ m/s[/tex]
For electron,
[tex]\dfrac{1}{2}m_ev_e^2=eV\\\\v_e^2=\dfrac{2eV}{m_e}\\\\v_e=\sqrt{\dfrac{2eV}{m_e}}[/tex]
[tex]m_e[/tex] is mass of proton
[tex]v_e=\sqrt{\dfrac{2\times 3.1\times 1.6\times 10^{-19}\ J}{9.1\times 10^{-31}\ kg}}\\\\v_e=1.44\times 10^6\ m/s[/tex]
Hence, this is the required solution.
A drop
of
oil volume 10 m
Spreads out on water to make a
Circular fils of diameter 10
What is that thickness?
Answer:
[tex]27.5\ m[/tex]
Explanation:
As we know that volume of cylinder is
[tex]v=\pi r^{2} *h[/tex]
Where v=volume , h= height or thickness and r= radius
Here,
[tex]v= 10 m ,\ diameter= 10, \ r=\frac{diameter}{2} \ r=\frac{10}{2}\\ r=5[/tex]
Putting these values in the previous equation , we get
[tex]10\ = \frac{22}{7} *5 *5*h\\ 14\ =\ 110*h\\h=\frac{110}{14} \\h=\frac{55}{2} \\\\h=27.5\ m[/tex]
Therefore thickness is 27.5 m
Why would it be difficult to experimentally calculate the speed of sound in the classroom with a stopwatch and meter stick?
Answer:
Sound travels quite fast and sound wave must pass through a medium, such as air.
To measure a sound in classroom you will require to measure the time it takes a sound to travel a measured distance using stopwatch and meter stick but it would be difficult because walls of classroom will create echos echos.
Echos are reflections of sounds which causes timing errors and make difficult to meausre the speed of sound.
Arace car starts from rest and accelerates uniformly to a speed of 40 m/s in 8.
seconds. How far will the car travel during the 8 seconds?
meters
Type the correct answer, then press Enter.
Answer:
160 m
Explanation:
For computing the distance first we have to determine the acceleration which is shown below:
v = u + at
where,
v = 0 = initial velocity
u = 40 = uniformly to a speed
t = 8 = time
So, the a is
= 40 ÷ 8
= 5 m/s
Now we have to use the distance formula i.e
d = ut + 1 ÷ 2 at^2
= 1 ÷2 × 5 × 8^2
= 160 m
Basically we have to applied the above formulas so that the distance could come
The earth attracts an apple with a force of 15 Newton. taking this as an action force, how much is reaction force? who accepts the reaction force? on which body does a reaction force act?
Answer:
action = reaction
land accepts
reaction force acts on the apple
Answer:
15 Newton
Explanation:
According to Newton's third law of motion, "Every action has a reaction which is equal in magnitude but opposite in direction" (Right now, we're not talking about direction, so we'll ignore it)
So,
Action Force = Reaction Force
Reaction Force = 15 N
The action force is by the Earth on the Apple, So the reaction force will be by the Apple on the Earth.
output work is always less than input work,why
Answer:
Output work is always less than input work due to effect of friction. Machines are frictionless in practice, the efficiency of a machine can never be 100%.
Hope this helps..
Good luck on your assignment..
Answer:
Friction
Explanation:
a skier traveling 11m/s goes up a 19 degree inclined plane, and glides up 15m before coming to rest. what is the average coefficient of friction?
Answer:
do you mind telling me what is it your asking so i can help ?
Explanation:
the handles of tin-snips (metal cutter) are made long ,why
Answer:
because lwhen they are made longer than the turning effect of force is more and its easy to work it out.
As the distance between a satellite in a circular orbit and the central object increases, the period of the satellite .
Answer:
As the distance between a satellite in a circular orbit and the central object increases, the period of the satellite increases .
Explanation:
Answer:
Increases
Explanation:
A lizard leaps 2.1\,\text m2.1m2, point, 1, start text, m, end text to the left in 0.52\,\text s0.52s0, point, 52, start text, s, end text. What was its average speed in \dfrac{\text m}{\text s} s m start fraction, start text, m, end text, divided by, start text, s, end text, end fraction
Answer:
v = 4.03 m/s
Explanation:
It is given that,
Distance covered by a lizard, d = 2.1 m
Time taken by lizard, t = 0.52 s
We need to find the average speed of the lizard. The distance covered divided by time taken is called the average speed of lizard. So,
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{2.1\ m}{0.52\ s}\\\\v=4.03\ m/s[/tex]
So, the average speed of the lizard is 4.03 m/s.
Answer: 4.02 not 4.03
Explanation: I did on khan academy
A 1250 kg car is stopped at a traffic light. A 3550 kg truck moving at 8.33 m/s hits the car from behind. If bumpers lock, how fast will the two vehicles move?
Answer:
the two vehicles will be moving at a speed of 6.16 m/s
Explanation:
This is a case of completely inelastic collision, therefore, the conservation of momentum can be written as:
[tex]m_1\,v_1+m_2\,v_2=(m_1+m_2)\,v_f[/tex]
which given the information provided results into:
[tex]m_1\,v_1+m_2\,v_2=(m_1+m_2)\,v_f\\(1250)\,(0)+(3550)\,(8.33)=(1250+3550)\,v_f\\29571.5=4800\,v_f\\v_f=6.16\,\,m/s[/tex]
which glass is used in astrology?
Answer:
The answer is either looking glass or stained glass.
Explanation:
The popular glass used in astrology is stained glass which is popular in symbolization of huge astrology figures. As for looking glass, it's more popular in astrological souvenirs or objects.
Answer:
i think answer is pisces horoscope
Okay please help me all my assignments are due tomorrow! I need to know 5 examples of all 6 simple machines that can be found in a house! Please specify the machine for the items! Thank you!
EXAMPLE
BIKE/STROLLER - WHEEL AND AXLE
SCISSORS/HEDGE CUTTER - LEVER
STAIRS - INCLINED PLANED
SCREW DRIVER/SCREW/NAILS- SCREW
AXE - WEDGE
WELL - PULLEY
Its not much but hope this help you
Planets revolve around the sun why
Why is it advisable not to look directly at the Sun? Please Give scientific reason for your answer
Answer:
your eyes would get seriously damaged
Explanation:
when you look directly at the sun, the sun shines it's rays directly to your eyes , which damage them. that's why you should always wear sunglasses in that type of weather, and never point directly at the sun. if you find this answer helpful, mark it as brainliest.
If the two blocks are moving to the right at constant velocity, A. the horizontal force that B exerts on A points to the left. B. the horizontal force that B exerts on A points to the right. C. B exerts no horizontal force on A. D. not enough information given to decide
Answer:
D. not enough information to decide
Explanation:
i dont understand >.<
Will mark brainliest for the first person who answered correctly Which of the following is an example of non-renewable energy? Hydroelectric Gas Solar Wind
Answer:
gas is non-renewable resource
Explanation:
Answer:
Gas
Explanation:
There are two types of energy sources, renewable and non-renewable.
Solar energy, wind energy, and hydroelectric are an example of renewable energy.
Fossil fuels like gas, coal, and petroleum are an example of non-renewable energy.
A suitcase of mass 20 kg moves along a conveyer belt at 0.5 m/s. Calculate its kinetic energy.
Answer:
K.E.=2.5Nm
Explanation:
m=20kg
v=0.5m/s
K.E.=?
K.E.=1/2mv²
K.E.=1/2×20kg×(0.5m/s)²
K.E.=10kg×0.25m²/s²
K.E.=2.5Nm
i hope this will help you :)
Select the arrangement of electromagnetic radiation which starts with the lowest wavelength and increases greatest wavelength. Multiple Choice radio, ultraviolet, infrared, gamma rays gamma rays, ultraviolet, infrared, radio radio, infrared, ultraviolet, gamma rays gamma rays, infrared, radio, ultraviolet gamma rays, radio, ultraviolet, infrared
Answer:
gamma rays, ultraviolet, infrared, radio
Explanation:
Because on the Electromagnetic spectrum wavelength increases from the gamma end to radio end and frequency decrease in that order
Answer:
radio → infrared → ultraviolet → gamma
Explanation: yeaaahhh its c