Answer:
12 g
Explanation:
No of moles = [tex]\frac{mass}{mass.in.1.mole}[/tex]
But we have to find the mass, not the number of moles. So,
Mass = No. of moles × mass in 1 mole
Mass of helium = 4
Mass = 3 × 4
= 12 grams
A wave is traveling at the speed of light. If it has a frequency of 4 x 10^15 Hz, what is its wavelength?
Answer:
7.5x10-^8m
Explanation:
the formulae is v=fh ,where f is frequency
h is wavelength
hence wavelength=v/f
since the speed of light is 3x10^8
then the wavelength =3 x 10^8/4 x 10^15
=7.5x10^-8m
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.
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:
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.
Kennedy and Lilly are in science class. They are asked to prove that some forces are non-contact
forces. The girls list five examples of objects exerting a force on each other without touching. Do you
agree with their list? Tell why or why not?
1. Two like magnetic poles repel each other.
2. Putting on a wool sweater can make your hair get static electricity when it rubs against the
sweater.
3. When you bring two negatively charged balloons near each other they push each other away.
4. Magnets stick to a refrigerator.
Number 1 and 3 demonstrate non-contact forces because the magnets or electrically charged objects exert
forces on each other without touching.
3 is the only example of non-contact forces since like charges repel each other.
Number 1 and 4 are non-contact forces since they both use magnets.
All four are good examples of non-contact forces since they all use either magnets or electric charge which are
non-contact forces.
Answer:1,3 and 5
Explanation:
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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The resistance of a 24 W, 12 V filament lamp depends on the current flowing through the lamp. For currents up to 0.8 A, the resistance has a constant value of 2.5 Ω.
Calculate the potential difference across the lamp when a current of 0.8 A flows through the lamp.
Answer:
V=IR
V=0.8×2.5
V=2V
where V=potential difference
I=Current
R=Resistance
.........
What happens when you cut a magnet
in half?
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:
A child pulls on wagon with force of 20 N if the wagon models a total of 10 M in four seconds what is the average power generated by the child in watts
Answer:
[tex]power = \frac{(force \times distance)}{(time)} \\ power = \frac{(20 \times 10)}{4} \\ power = \frac{200}{4} \\ power = 50 \: watts[/tex]
What type of friction is it when two students are pushing a box that is at rest
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
Yub87654d HELP there is this person trying to kid,.,nap,./, kids so if you see an account called Hernyana report there questions and there account
copy my question and post it
76ryvubiuoj78
Answer:
what???
Explanation:
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
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:
If the rocket launches with a force of 10N, what is the force on the launch pad?
Answer:
10N
Explanation:
Action and Reaction forces state that the force will be equal
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:
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!
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 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:
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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Radio waves travel at the speed of light. How long would it take the Russians
to send a message to a spacecraft orbiting Mars at a distance of 7.8 x 10^10 m
from Earth?
Answer: you can call you when you can get me a call and I have to go back your mom I don’t have a lot to say about that because you don’t want me a little more because you have a lot to me because I have to do it I have a lot to say about it I have a good day and you don’t have a good day and you have a lot of fun with your family I don’t want you have a good night I love your day you ty me you don’t want me a good night to me a little about me you don’t have a good day I love your day I don’t
Explanation: the app crashes every time I have a good night and a good night out and it is good yuyu Hi hi mom I have to go back and pick you a little little more you have to go back
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.
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
Which force is sometimes attractive and has an infinite range?
A.strong nuclear
B.weak nuclear
C.gravitational
D.electromagnetic
Answer:
C. gravitational
Explanation:
Answer:
c
Explanation:
edge
how does an a.c generator work?
1. A car interior is heated to 48 C by the sun What type of energy transfer?
A car has a weight of 10 000 N. A man takes 10 seconds to push the car 5 m using a force of 1000 N. calculate the work done