Answer:
0.011 m
Explanation:
From the question,
The speed of a moving wave is related as
c = λf.................... Equation 1
Where c = speed of the wave, λ = wave length, f = frequency.
make λ the subject of equation in equation 1 above
λ = c/f................ Equation 2
Given: c = 3.0×10⁸ m/s, f = 2.75×10¹⁰ Hz
Substitute theses values into equation 2
λ = 3.0×10⁸/(2.75×10¹⁰)
λ =
Answer:
1.09 * 10^-2
Explanation:
I got it right when I did it. This is the right answer. I tried the other answer and was wrong that the other guy posted.
4. Find the density of 2750 g of a substance that occupies 250 mL.
In the universe there are more small stars than large stars. Do you think there are more white dwarfs or black holes? Explain your answer.
Answer: black holes
Explanation:
What is the relationship between increase speed of a car and energy in a
collision?
Hello,
QUESTION)✔We have : Ek = 1/2m x v²In other words, when the speed doubles the collision energy of the car, or simply the kinetic energy, is multiplied by two.
A student measures the time it takes for two reactions to be completed.
Reaction A is completed in 39 seconds, and reaction B is completed in 50
seconds. What can the student conclude about the rates of these reactions?
A. The rate of reaction A is higher.
B. The rates of reactions A and B are equal.
C. The rate of reaction B is higher.
Answer:
The rate of reaction A is higher.
answer is AAAAA !
Explanation:
Answer: A. The rate of reaction A is higher
Explanation:
A boy is looking into a plane mirror .His nose is 30 cm in front of the mirror .How far is his nose from where its image appears to be ?
Answer:
60cm
Explanation:
30+30=60
Hold your index finger and middle fingers close to each other, leaving a small slit between them about 1 mm in width. Look through the slit into a source of light such as the window or lamp (NOT THE SUN). You will need to look with one eye up close to the slit. Why do the vertical black lines show up when your fingers are close together but not when they are far apart? Explain.
Answer:
I would say tunnel vision cause your only using one eye and if your looking through a tiny space your vision gets blury
Explanation:
Which of the following would I use to measure the distance across a GALAXY?
A) Astronomical Unit (AU)
C) Kilometer (Km)
B) Light Year (LY)
D) Miles (mi)
Answer:
B - Light Year (LY)
It takes 29.53 days for the Moon to rotate around Earth. What would happen if the Moon does not rotate or rotates faster than it does now?
Answer:
Explanation:
If the Moon rotated as fast as the Earth would we only see one side of the Moon? ... The Moon, on the other hand, rotates once around its own axis every 28 days, and once around the Earth in that same 28 days. The end result of this combination is that the same side of the Moon is always facing the Earth.
Answer:
If the Moon rotated as fast as the Earth would we only see one side of the Moon? ... The Moon, on the other hand, rotates once around its own axis every 28 days, and once around the Earth in that same 28 days. The end result of this combination is that the same side of the Moon is always facing the Earth.
Explanation:
1. A car interior is heated to 48 C by the sun What type of energy transfer?
A person walks 40. m east, then 20. m west. He then
continues 30. m south and finally 20.m west. What is
the total distance and displacement traveled?
Answer:
ok
Explanation:
HELPWhat is the intensity of an electric field at a point where a 0.50 C
charge experiences a force of 20. N?
Remember to identity all of your data, write the equation, and show
your work. (5 points)
Answer:intensity of an electric field (E)
charge (q)
Force (F)
E=F/q
E=20N/.5C
E=40N/C
Explanation:
The Electric field intensity will be 40 N/C
What is an Electric field intensity ?The electric field intensity at a point is the force experienced by a unit positive charge placed at that point.
Electric field intensity(E) = force (F)/ charge(q)
given
charge = 0.50 C
Force = 20 N
Electric field intensity = ?
E = 20 N / 0.50 C
E = 40 N/C
The Electric field intensity will be 40 N/C
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A 13.0-V battery is connected in series with a switch, resistor and coil. If the circuit's time constant is 1.20 ´ 10-4 s and the final steady current after the switch is closed becomes 2.50 A
Answer:
R = 5.20 Ω, L = 6.24 10⁻⁴ H
Explanation:
The current in an RL circuit is
I = [tex]\frac{E}{R} \ (1- e^{- t/ \tau } )[/tex]
τ = L / R
In the problem they indicate the value of the voltage, the current and the time constant, for which the resistance must be found
The stable current is when enough time has passed (t »τ) after closing the circuit, therefore the exponential term is very small and we can neglect it.
I = E / R
R = E / I
let's calculate
R = 13.0 / 2.50
R = 5.20 Ω
now with this value we can find the inductance of the coil
τ = L / R
L = τ R
L = 1.20 10⁻⁴ 5.2
L = 6.24 10⁻⁴ H
what force is required to accelerate to 10 kg object to 5.9 m/s/s?
Force required to accelerate 10 kg object to 5.9 m/s/s ?
Mass = 10 kg
Acceleration = 5.9 m/s^2
Force = Mass * Acceleration
Force = 10 kg * 5.9 m/s^2
Force = 59 kg m /s^2 = 59 N
Let’s say hypothetically I was living the same day over and over agian, and I couldn’t fix it, would other people be able to still go to the next day?
Answer:
no because it will also affect other people
how to calculate time in uniform electric field using acceleration and distance only
the formula
Answer:
[tex]t = \sqrt{\frac{s}{a} }[/tex]
Explanation:
In order to find the time in a uniform magnetic field in terms of acceleration and time we will use the general formula of acceleration, which is given as follows:
[tex]a = \frac{v}{t} \\\\where,\\\\a = acceleration\\v = velcoity = \frac{s}{t} \\\\t = time\ taken\\s = distance\ covered\ in\ the\ field\\\\therefore,\\\\a = \frac{s}{t^2}\\\\t^2 = \frac{s}{a}\\\\t = \sqrt{\frac{s}{a} }[/tex]
This formula can be used to measure time in a uniform electric field in terms of distance and time only.
What is the speed of light in a medium if the index of refraction is 1.57?
Answer:
1.91 × 10⁸ m/s
Explanation:
[tex]n = \frac{c}{v} \\ 1.57 = \frac{3.0 \times {10}^{8} }{v} \\ v = 1.91 \times {10}^{8} \: ms {}^{ - 1} [/tex]
The speed of light in a medium if the index of refraction is 1.57 is 1.91 * 10⁸ m/s
The refractive index of a material is the ratio of speed of light in air to speed of light in the medium. It is given by:
Refractive index(n) = speed of light in air(c) / speed of light in material(v)
Given that n = 1.57, c = 3 * 10⁸ m/s, hence:
n = c/v
1.57 = 3 * 10⁸ / v
v = 1.91 * 10⁸ m/s
The speed of light in a medium if the index of refraction is 1.57 is 1.91 * 10⁸ m/s
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how much force is needed to accelerate at 66 kg skier 4m/s^2 ?
Does earths gravitational field affect objects in space? State your claim. Summarize seven is to support your claim. Explain your reasoning.
Answer:
Earth's gravity pulls objects downward towards the surface gravity pulls on the space station too as a result they fall around the planet the moon stays in orbit around the Earth for this same reason
Which sport requires the least amount of agility? HELLLLPPP
1.volley ball
2.golf
3.football
4.basketball
Answer:
golf
Explanation:
it's less physical strength in more of you hitting the ball with whatever the stick is called
Nolan tests how distance from a magnet affects the strength of the magnetic field. He tapes a
magnet and a wooden ruler to the table so the ruler's end touches the magnet. Next, he places paper
clips at different distances from the magnet and records his observations. What does he observe?
The closer the paper clips are to the magnet, the less they are attracted to it.
The closer the paper clips are to the magnet, the more they are attracted to it.
The magnet attracts the same number of paper clips at all distances.
O The magnet does not attract any paper clips at all at any distance.
The observations made by Nolan on variation of magnetic force with distance is that the closer the paper clips are to the magnet, the more they are attracted to it.
What are magnets?Magnets are the objects usually made of iron or nickel or cobalt which has the property of attracting other iron objects and property of attraction and repulsion with other magnets.
What is Magnetic force?It is the force of attraction or repulsion produced by a magnet . When a magnet is kept near other magnet, the unlike poles attract each other and like poles repel each other. when a magnet is kept near an iron object it attracts the iron object towards it with a magnetic force
The magnetic force varies with distance, it is more stronger near the magnet and less as we go away from it.
So the paper clips which are made of iron when kept near to the magnet are attracted more as compared to the paper clips which are away from the magnet.
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When current passes through a wire, a magnetic field is created around the wire only if the:
□ if the wire is absolutely straight
□ if the wire is curved in a loop
□if the current makes a complete loop
□if the current comes from a battery always around the wire
Answer:
when current passes through a wire amagnetic field is created.
Whenever the current passes through a wire then the magnetic fields in the form of a circular loop form around the wire.
What is a magnetic field?The magnetic field is generally a force that is generated due to the flow of electrons in the wire.
The magnetic field generated is always in the circular loop around the wire.
The magnetic field only remains around the wire as far there is the flow of the current in the wire.
if the flow of the current terminated then the force of the magnetic field also vanished.
Thus Whenever the current passes through a wire then the magnetic fields in the form of a circular loop form around the wire.
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what force on a 936kg elevator that is falling freely at 9.8 m/s^2
Answer:
9172.8 N
Explanation:
F = ma
F = (936 kg)(9.8 m/s^2)
F = 9172.8 N
Some help please :)
At which stage in the life cycle of a star is helium combined to form elements lithium through iron? Explain.
Answer:
Explanation:
During the formation of the universe some 14 billion years ago in the so-called ‘Big Bang’, only the lightest elements were formed – hydrogen and helium along with trace amounts of lithium and beryllium. As the cloud of cosmic dust and gases from the Big Bang cooled, stars formed, and these then grouped together to form galaxies.
What will happen to the sun when fusion from hydrogen into helium slows down?
Answer:
The Sun is a main-sequence star, and, as such, generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen and makes 616 million metric tons of helium each second.
what is a Non-Example of Newton's 1st law?
Answer:
Say a 14 year old girl was at a construction site and she was asked to move something like a 10,000 pound brick( one brick). She would be acting on it as the unbalanced force but they would still not change their position.
so to say the girl would be doing everything she could to move that brick but the brick would still be in that same spot so the unbalanced force (the girl) would be acting on the thing that was at rest but it wouldn't move.
so the unbalanced force would not really be acting on the thing at rest; even though the unbalanced force was doing something to the brick.
( just think about it and you will eventually get it...just imagine in your head...)
Explanation:
Describe the mirror forula for a concave mirror
Answer:
1 =1 +1
f. v u
Explanation:
f is the focal length
v is the image distance
u is the object distance
1/f = 1/v + 1/u
The above formula gives us the relation between 'f' 'v' & 'u', Where :
f = focal length
v = image distance
u = object distance
This formula not only used for concave mirror, but also for convex mirror.
Can someone tell me everything they know about mechanical waves and ASAP, please!?!?!?
Answer:
A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far fro
Explanation:
PLEASE HELP ME SOLVE ASAP
Answer:
a) The distance after 1 minute will be x = 600 m.
b) The distance of vertical drop from A to B is [tex]\Delta y=17658\: m[/tex].
Explanation:
Let's use the parabolic motion equations. Here we have a horizontal initial velocity, and knowing that the horizontal velocity is a constant we have:
a)
[tex]v_{x}=\frac{\Delta x}{\Delta t}[/tex] (1)
Where:
v(x) is the horizontal velocity (v(x) = 36 km/h = 10 m/s)Δx is the displacement Δt is the time (Δt = 1 min = 60 s)Usinf (1) we find Δx:
[tex]\Delta x=v_{x}\Delta t[/tex]
[tex]\Delta x=10*60=600 m[/tex]
Therefore, the distance after 1 minute will be x = 600 m
b)
Here we need to find Δy = y(A)-y(B), this is the distance of vertical drop from A to B.
Using the following equation we will get it:
[tex]y_{B}=y_{A}+v_{iy}t-\frac{1}{2}gt^{2}[/tex]
Let's recall that the initial velocity in the y-direction is 0.
[tex]y_{A}-y_{B}=0t+\frac{1}{2}gt^{2}[/tex]
[tex]\Delta y=\frac{1}{2}gt^{2}[/tex]
[tex]\Delta y=\frac{1}{2}(9.81)(60)^{2}[/tex]
[tex]\Delta y=17658\: m[/tex]
Therefore, the distance of vertical drop from A to B is [tex]\Delta y=17658\: m[/tex].
I hope it helps you!
Electric kettle with the resistance of 20-02.is used-to-heat:4 kg of water. If
the initial temperature of the water is 20°C, how much time-later will the water boil?
C-water=-4200 J/kg°C. The kettle uses:220 V voltage.
Picture=Example
3-the-lamps are connected in series. The first-lamp-has-a-current-of2-A and
a resistance of 4 Ohms. The second-lamp has a voltage of 10V. The third-lamp has a
voltage of 6V. Find in this diagram the total voltage, the current for all the lamps, the
total-resistance.