The key to solve this problem is the conservation of momentum. The momentum of an object is defined as the product between the mass and the velocity, and it's usually labelled with the letter [tex]p[/tex]:
[tex]p=mv[/tex]
The total momentum is the sum of the momentums. The initial situation is the following:
[tex]m_A=15,\quad v_A=3,\quad m_B=5,\quad v_B=0[/tex]
(it's not written explicitly, but I assume that the 5-kg object is still at the beginning).
So, at the beginning, the total momentum is
[tex]p=m_Av_A+m_Bv_B=15\cdot 3+5\cdot 0=45[/tex]
At the end, we have
[tex]m_A=15,\quad v_A=1,\quad m_B=5,\quad v_B=x[/tex]
(the mass obviously don't change, the new velocity of the 15-kg object is 1, and the velocity of the 5-kg object is unkown)
After the impact, the total momentum is
[tex]p=m_Av_A+m_Bv_B=15\cdot 1+5\cdot x=15+5x[/tex]
Since the momentum is preserved, the initial and final momentum must be the same. Set an equation between the initial and final momentum and solve it for [tex]x[/tex], and you'll have the final velocity of the 5-kg object.
A hammer head of mass 600g, produces force
of 360N when it strikes the head of a nail Explain how it's possible for the hammer to
drive the nail into a piece of wood, yet a weight of360N resting on the head of
Nail would not??
Answer:
Explanation:
When a hammer is swung in the air, it accumulates the energy in the form of kinetic energy and this energy is imparted to the nail in an instant produces a
a large amount of force to drive the nail into the wood.
The amount depends upon how large your swing and the size of the hammerhead as more energy will be accumulated if the above process occurs to a greater extent.
A bird is flying with through the air with a speed of 18.0 m/s. As it flies, it holds in its claws a 2 kg fish that it
just caught moments ago. Suddenly, the fish wiggles a bit the bird loses its grip, and the fish falls 5.4 m, landing
in the lake below. What speed does the fish have right before safely splashing back into the lake?
Material A has a higher thermal conductivity than Material B. Which material will transfer energy by conduction faster?
Answer: a
Explanation:
If a magnetic field is to exert a force on a current-carrying wire, the field must have some vector component:
A.) parallel with the current
B.) tangential to the current
C.) concentric with the current
D.) perpendicular to the current
Answer:
D.) perpendicular to the current
i am 100% sure :)
HELP I'll Mark as brainliest!
Answer: Gus sues Russell for stealing postage stamps
Explanation:
Please please please please PLEASE help!!!
Brainliest for whoever gets this right!
Describe how an earth wire and a fuse can protect an iPad with a metal casing
- 5 clear simple points
Answer: an earth wire and a fuse can protect an ipad with a metal casing because an earth wire is strong and a fuse is basically a force and if you put them together the work like really good
Explanation:
idk i was just guessing sorry
does anyone know any of these?
Answer:
The last question is one Liter (sorry that is the only question I know for now).
Explanation:
Mainly because 1000cm is the same volume and area for an answer from this equation which is the block of wood.
Sorry that that was the only answer I knew :(
I'll see what else I can find and I'll edit this question later and write the rest of the answers-or any of them that I will know later on :)
I hope this answer helps :)
-EarthGirl
Which of the following observations demonstrates the differences between speed of light and speed of sound? (Note, they are all true, but which one
represents the difference in the speed?))
A. In space you can see an explosion, but are unable to hear it.
B. A light bulb "pops" when it bums out.
C. You see lightning and then hear the thunder.
D. You are able to hear a sound coming from the apartment next to you, but you cannot see a light coming from a lamp in the apartment
Answer:
Definitely C.
1. Which Law? When you are standing up in a subway train, and the train suddenly stops, your body continues to go forward.
A. Law 1
B. Law 2
C. Law 3
2. Which Law? A swimmer pushes water back with her arms, but her body moves forward.
A. Law 1
B. Law 2
C. Law 3
3. Which Law? After you start your motorcycle, as you give it more gas, it goes faster.
A. Law 1
B. Law 2
C. Law 3
1. Law 1, since there is no other force acting on your body as you stand there, so you will continue to go forward.
2. Law 3, since the swimmer is using opposite forces to propel herself through the water. She generates a force by pushing the water which helps to push her forward.
3. Law 2, since you are giving the motorcycle more energy as a result of the gas being transformed into the energy that helps to accelerate the motorcycle's speed.
Which sentences describe the cyclone device?
A cyclone device accumulates fine particulates from the air by making a dirty air stream flow in a spiral path inside a
cylindrical chamber. It consists of several long and narrow fabric filter bags suspended upside-down in a large
enclosure. When dirty alr enters the chamber, the larger particulates strike the chamber wall and fall into a conical dust
hopper at the bottom. Fans blow dirt-filled air upward from the bottom of the enclosure, trapping dirt particles inside the
filter bags and releasing clean air from the top. The top of the chamber has an outlet that lets out cleaned air.
Answer: Option A
Explanation:
A cyclone device is an instrument which measures the cyclone. In this case the device collects the particulates mixed in air which makes the air dirty.
It revolves inside the cylindrical chamber in a forming a spiral path. This is what a cyclone is.
In real, the cyclone is also the same but is so huge that it carries away the things coming in its path. These things can be homes, trees and other materials.
This is very destructive and cause loss of life and loss of assets.
Whenever energy changes form, people sometimes say that some energy is "lost." What is meant by this?
A. The energy is not truly lost; it transforms into forms that are not easily put to use.
B. The process of changing form reduces the total amount of energy in the universe.
C. Whenever energy changes form in one location, a corresponding change in the opposite direction must take place somewhere else.
D. Sometimes a "mistake" or an inefficiency in the transformation causes energy to be destroyed.
Answer:
A. The energy is not truly lost: it transforms into forms that are not easily put to use.
Explanation:
This is due to the fact that when we use energy, it seems to have disappear, but it really hasn't. In fact, when we use energy, it is changing into another form that has to be converted in order for energy to be present once again.
Answer:
A
Explanation:
Which piece of evidence from the article explains WHY the sun has a larger force of gravity
than the Earth?
(A)
Isaac Newton, an English scientist, discovered a law, or truth, about
gravity in the late 1600s.
(B)
The greater the mass of an object, the greater is its force of gravity.
(C)
Even a speck of dust has a force of gravity
(D)
The smaller the distance, the greater is the force of gravity between them.
Answer:
(B)
The greater the mass of an object, the greater is its force of gravity.
Please please please please PLEASE help!!!
Brainliest for whoever gets this right!
Describe how an earth wire and a fuse can protect an iPad with a metal casing
- 5 clear simple points
Answer:
Because the electricity flows through and creates static bonds around the metal case which creates a bond with other fields that protects it.
Explanation:
The appearance of an element is a
Answer:
The correct answer to the following question will be "Element appearance".
Explanation:
Individual elements could even establish a global look that supersedes all components' default configuration as well as appears to apply to something like the factor indicates whereas it makes it appear in illustrations.The appearance of such an element can sometimes be modified around at the individual levels graph or chart.So that the above is the right answer.
Find the velocity of a wave of period 2 s and wavelength 0.5m. *
Answer:
The velocity of wave is 0.25m/s
Explanation:
First, you have to find the fequency using the formula, F = 1/Time :
[tex]f = \frac{1}{t} [/tex]
Let t = 2s,
[tex]f = \frac{1}{2} [/tex]
[tex]f = 0.5Hz[/tex]
Next, you have to use speed formula, V = f×λ :
Let f = 0.5Hz,
Let λ = 0.5m,
[tex]v = 0.5 \times 0.5[/tex]
[tex]v = 0.25[/tex]
Which statement is correct? (2 points)
Group of answer choices
(A) When a positively charged atom loses an electron to a positively charged atom, two neutral atoms are created.
(B) When a neutral atom loses an electron to another neutral atom, two charged atoms are created.
( C ) When a neutral atom loses an electron to a positively charged atom, both atoms become neutral.
(D) When charged atoms lose electrons they will become positively charged atoms.
Answer:
When a neutral atom looses an electron to another neutral atom, two charged atoms are created.
Explanation:
On the off chance that one of the two unbiased particle looses an electron, it turns out to be emphatically (charge: +1), in light of the fact that the electron conveys a charge of - 1. Thus, the other atom which acknowledges the electron turns out to be adversely charged (charge: - 1). And in the end, we will have two charged atoms.
Answer:
C
Explanation:
Remember This, energy cannot be created or destroyed only transfered
etc.
what is an electric current
What pattern is shown in the graph between fossil fuels and carbon emissions?
Over the years, ( increased / decreased) burning of fossil fuels has caused global carbon emissions to ( increase / decrease / remain the same ).
Hello there!
Over the years, increased burning of fossil fuels has caused global carbon emissions to increase.
Select all that apply.
The following diagram shows the path of a planet around the Sun. Kepler discovered that _____.
A)area A = area B
B)the distance from P2 to P3 is half the distance from P5 to P6
C)the speed in the interval from P1 to P2 is twice the speed in the interval from P6 to P1
D)the speed in the interval from P1 to P2 is less than the speed in the interval from P3 to P4
Answer:
The right answer is area =Area C
Explanation:
We can solve the problem by using kepler's law of planetry motion.
Kepler discovered that area B = area C because of its similar distance of orbit from the sun.
What Kepler discovered?A certain planet sweeps out an area B from the point P3 to P4 in a time t while on the other hand, for the same interval of time t, the planet sweeps out an area C from point P4 to P5, that is equal to the previous area according to second Kepler's law.
So we can conclude that Kepler discovered that area B = area C because of its similar distance of orbit from the sun.
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2. An ammeter registers 2.5 A of current in a wire that is connected to a 9.0 V
battery. What is the wire's resistance?
Answer:
3.6 Ω
Explanation:
Resistance: This is defined as the opposition to the flow of current in an electric circuit. The S.I unit of Resistance is Ohm's (Ω).
From the question above,
Applying Ohm's law
V = IR...................... Equation 1
Where V = Voltage, I = current registered by the ammeter, R = Resistance.
make R the subject of the equation
R = V/I............... Equation 2
Given: V = 9 V, I = 2.5 A
Substitute into equation 2
R = 9/2.5
R = 3.6 Ω
Hence the resistance of the wire = 3.6 Ω
When did they start using the word "Scrubbed" for launches?
Answer:
Many speculation exists for why the term 'scrubbed' is used in relation to launches. One of these is that during world war II, when the Air force planned bombing raids. These Air force missions had their briefings done with illustration of the details of the launch and and flight drawn on chalkboards. When some of mission flight takeoffs were canceled (due to bad weather or a malfunction or other reasons) the details were then scrubbed off of the chalkboard. This idea of the mission being scrubbed meaning that it is no longer to be followed through with, proceeded to this modern day rocket and aviation launches.
A book with a mass of 3.3 kg sits on a bookshelf. If it has a gravitational
potential energy of 57 J, how high is the shelf? The acceleration of gravity is
9.8 m/s2
Given that,
Mass of the Book (M) = 3.3 Kg Gravitational Potential Energy (P) = 57 J Acceleration Due to Gravity (g) = 9.8 m/s²We have to find the height of the shelf
We know that,
[tex]\tt P = MgH [/tex]
Putting the values,
[tex] \sf \: 57 = 3.3 \times 9.8 \times h \\ \\ \implies \: \sf \: 57 = 32.34 \times h \\ \\ \implies \: \sf \: h = 1.76 \: m \: (approx)[/tex]
The height of the shelf is 1.76 mThe height of the shelf is 1.76 m
What is the meaning of mass in the church?
The definition of mass is the Liturgy of the Eucharist or a body of matter or a large number of people or things. An example of mass is a Roman Catholic church service. An example of mass is a pile of clay. An example of a mass is a gathering of thousands of people.
Given that,
Mass of the Book (M) = 3.3 Kg
Gravitational Potential Energy (P) = 57 J
Acceleration Due to Gravity (g) = 9.8 m/s²
We have to find the height of the shelf
We know that,
p = MgH
Putting the values,
57 = 3.3 × 9.8 × h
→ 57 = 33.34 × h
→ h = 1.76 approx
The height of the shelf is 1.76 m
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Which two conditions would result in the weakest electric force between objects?
Objects are conductors with unbalanced charges
Objects are insulators with balanced charges
Objects are far apart
Objects are close together
The weakest electric force between objects is seen when objects are far apart.
The electric force is the force that exists between two electrically charged bodies. The force could be attractive or repulsive. The electrical force between two bodies is given by Coulomb's law.
The weakest electric force between objects is seen when objects are far apart in obedience to Coulomb's law.
Learn more about electric force: https://brainly.com/question/1076352
Answer:
objects are far apart and Objects are insulators with balanced charges
Explanation:
believe me or not, it's right either way
Ernesto is an engineer who is trying to develop a lighter, stronger carbon wire. He looks to nanotechnology, because he wants a wire with high resistance so it can give off heat. Where is Ernesto’s error? Carbon wires are heavy. Carbon wires have low resistance. Carbon wires are weak. Carbon wires are not a form of nanotechnology.
Answer:
B. Carbon wires have low resistance.
Explanation:
Nanotechnology is a technology that deals with the study and applications of matter on a very minute scale, [tex]10^{-9}[/tex]. This technology has a lot of applications in various fields of study and has been used in the fabrication of carbon nanotubes.
Carbon nanotubes are ultra thin carbon wires which can be used majorly in electronics. This wire has remarkable properties (it behaves as a metal or semiconductor) that make it suitable for electronic applications.
Ernesto made an error by planning to use carbon wire to generate heat. Carbon nanotubes has a low resistance, thus low thermal dissipation.
Answer:
B
Explanation:
edge
What is the path that an electric current follows called
Commercials for a toy bouncy ball advertise that it will bounce to a height that is greater than the
height from which it was dropped. Why is this impossible?
Answer:
because energy will be lost due to friction, sound, and heat (arguably similar to friction) and ENERGY MUST STAY THE SAME so it is IMPOSSIBLE for the ball to bounce higher than when dropped!
EXPLAIN Why does passing electricity through a metal filament cause it to
become so hot that it will emit heat and visible light?
Answer:
Why does the material emit light when you pass electrical current through it? When you pass current through a filament material, the resistance creates heat. Atoms in the material absorb energy. Electrons around the atoms are excited and temporarily reach an orbital which is further from the nucleus.
Explanation:
hope this helps u stay safe
Monochromatic light is incident on two slits separated by 0,2 mm. An interference pattern is observed on a screen 3,7 m away. The distance between the 3rd dark fringe and the central antinode is 0,048 What is the wavelength of the light? Write your answer in sicentific notation or in decimal form
Answer:
λ = 864 nm
Explanation:
To find the wavelength of the light you use the following formula, which determines the position of the m-th fringe in an interference pattern:
[tex]y_m=\frac{m\lambda D}{d}[/tex] (1)
ym: position of a bright fringe
D: distance from the slits to the screen = 3,7 m
d: distance between slits = 0,2mm = 0,2 *10^-3 m
m: order of the fringe
λ: wavelength of the light
You have the distance from the central peak to the third fringe (0,048m). Then, you can use the equation (1) with m=3 and solve for the wavelength:
[tex]y_3=\frac{3\lambda D}{d}\\\\\lambda=\frac{dy_3}{3D}=\frac{(0,2*10^{-3}m)(0,048m)}{3(3,7m)}=8,64*10^{-7}m\\\\\lambda=864*10^{-9}m=864nm[/tex]
henc, the wavelength of the light is 864nm
HI! I NEED HELP ASAP!!
Why are electromagnets used in metal scrap yards?
A.They are temporary magnets, so they can be turned on and off.
B. They are very powerful permanent magnets.
C. They are weak permanent magnets.
D. They are temporary magnets, so eventually the metal just falls off.
Answer:
The answer is A. They are temporary magnets, so they can be turned on or off.
Explanation:
An Electromagnet consist of a soft ion core in a current carrying solenoid that is wound in opposite direction round the two arms of a bar.
They are temporary magnets and they loose their magnetic property the moment they are turned off.
Answer:
A. They are temporary magnets, so they can be turned on or off.
Explanation:
All incident and reflected rays obey which law?
Answer:
law of reflection
Explanation: