Assuming that no outside forces are acting on ma or mb, which of the following expression BEST represents the speed, v' of the masses after the collision?
Answers
Answer: B
Explanation:
The conservation of momentum states that the initial momentum of the system must equal the final momentum of the system. Our system in this case is the two colliding objects and ONLY the two colliding objects. Initially, our system had mass 1 moving towards a stationary mass 2. The stationary mass has a velocity of 0m/s and therefore has no momentum. The initial momentum would then be:
[tex]p_i=m_1v_1_i+m_2v_2_i[/tex]
[tex]p_i=m_1v_1_i[/tex]
The final momentum depends on what type of collision occurred. This case is the simplest type of collision, when the objects stick to each other and act as one. Since the objects move together, their velocity must be the exact same. Our final momentum looks like:
[tex]p_f=m_1v_f+m_2v_f[/tex]
[tex]p_f=v_f(m_1+m_2)[/tex]
Setting the initial momentum equal to the final momentum:
[tex]p_i=p_f[/tex]
[tex]m_1v_1_i=v_f(m_1+m_2)[/tex]
Solving the final velocity:
[tex]v_f=m_1v_1_i/(m_1+m_2)[/tex]
Which matches answer B
Related Questions
What is magnetic force??
O A. A force between protons
O B. A force between two poles
O C. A force caused by air particles
O D. A force between objects with mass
Answers
Answer:
I believe it's B.
Explanation:
The force that a magnet exerts on certain materials, including other magnets, is called magnetic force. The force is exerted over a distance and includes forces of attraction and repulsion. North and south poles of two magnets attract each other, while two north poles or two south poles repel each other.
When a plastic spoon is rubbed on a woollen cloth and held above a mixture of salt and pepper, pepper jumps to the spoon. Choose the best reason for this: a) Air pushes the pepper towards the spoon. b) The spoon temporarily gets magnetised. c) The spoon temporarily gets charged with static electricity. d) Gravitational attraction pulls the pepper to the spoon.
Answers
Answer:
c) The spoon temporarily gets charged with static electricity.
Explanation:
Static electricity is the electric charge that arises on the material's surface. This is caused when the two positive and the negative charges come in contact with each other. The electricity generated finds an escape from the object's surface.
Rubbing the spoon makes it negatively charged while the sat and pepper have positive charge.
Between salt and pepper, it is the pepper that jumps to the spoon because it is lighter than salt.
What forces cause the magnetic repulsion and attraction?
Answers
Answer:
The cause of a magnetic force are small electrical currents or moving charges: Tiny circular currents at the atomic level are responsible in a permanent magnet for it to exert a magnetic force.
Explanation:
The section supports an upward internal shear force and a clockwise internal torque. Where does the absolute maximum shear stress occur?.
Answers
The absolute maximum shear stress will occur at : Point A
What is Shear stress ?Shear stress is a force that cause deformation of a material via slippage along planes which are parallel to each other.
From the diagram the shear stress distribution is parabolic in nature therefore the absolute maximum shear stress will occur at points A and C of the diagram.
The shear stress appears maximum at point A due to the shear force and torque
Hence we can conclude that the absolute maximum shear stress will occur at Point A
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Attached below is the missing image related to your question
1. If you move a magnet through a solenoid, an _______
is induced.
Answers
Answer:
electromotive force (emf)
Explanation:
From what height should you drop a ball so that it hits the ground at 40 m/s? How long will it take to hit the ground?
Answers
Explanation:
It is given that,
A ball hits the ground at 40 m/s
Let h is the height from where you drop a ball. It is based on the conservation of energy as :
[tex]mgh=\dfrac{1}{2}mv^2\\\\h=\dfrac{v^2}{2g}\\\\\text{Putting all the values in above formula}\\\\h=\dfrac{40^2}{2\times 9.8}\\\\h=81.63\ m[/tex]
It is dropped from a height of 81.63 m.
Let it take t seconds to hit the ground. When it hits the ground, its final speed, v = 0 and u = 40 m/s. So,
[tex]h=ut+\dfrac{1}{2}gt^2\\\\h=\dfrac{1}{2}gt^2\\\\t=(\dfrac{2h}{g})^{1/2}\\\\t=(\dfrac{2\times 81.63}{9.8})^{1/2}\\\\t=4.08\ s[/tex]
So, it will take 4.08 seconds to hit the ground.
1.When I cook an egg in a microwave oven, the device uses electromagnetic energy to increase the kinetic energy of particles of matter in the egg.
2.Many stoves and ovens have exhaust fans overhead to remove the rising warm air from the kitchen. The thermal energy is added to air and it rises.
3.When I cook an egg in a pan, thermal energy is transferred as the egg touches the hot surface of the pan. The thermal energy is transferred as objects touch.
choose which one are Conduction, Convection or Radiation
Answers
Answer:
1: Radiation 2: Convection 3: Conduction
Explanation:
How do glaciers affect sea level?
Answers
Mabey because they are melting so therefore the ice turns into water which means the sea level rises
What shape do we call the moon when we can only see a small slither or less than a 1/4 of the moon?.
Answers
Answer:
waxing crescent
Explanation:
waxing crescent
Explanation) A waxing crescent is the beginning of the lunar cycle. It is waxing because the right hand side is illuminated and it's growing. It is a crescent shape from a small sliver until it's just less than the 1st quarter.
50 points.
Lab: Newton's Laws of Motion Section III: Analysis and Discussion What do the key results indicate? If you constructed graphs, what trends do they indicate in your data?
Answers
In which beaker was the average kinetic energy of the particles the greatest?
Answers
Answer:
The warmer the temperature the more kinetic energy.
Explanation:
The highest temperature
The typical kinetic energy formula is used to comprehend the kinetic energy of a gas. This formula uses the gas's temperature to calculate the kinetic energy, or KE. This is carried out because a gas's kinetic energy is exactly related to its temperature. Thus option D is correct.
What role of average kinetic energy of the particles?Temperature is a gauge for the typical kinetic energy of a substance's constituent particles. It is a particle's typical kinetic energy.
A gas's temperature directly relates to the average kinetic energy of its particles. The particles must travel more quickly as the gas warms since their mass is constant.
The average kinetic energy of the particles in a sample of matter falls as it is continuously cooled. One would anticipate that eventually the particles will stop moving altogether.
Therefore, beaker D: 18 degree Celsius having average kinetic energy of the particles the greatest.
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an object is thrown upward , what is true about the objects upward velocity and acceleration
Answers
Answer:
option B is correct
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why was the triple beam balance invented
Answers
Answer:
The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. ... The triple beam balance can be used to measure mass directly from the objects, find mass by difference for liquid, and measure out substances.
How are suspensions, solutions, and colloids related?
Answers
Answer:
A solution is always transparent, light passes through with no scattering from solute particles which are molecule in size. ... A colloid is intermediate between a solution and a suspension. While a suspension will separate out a colloid will not. Colloids can be distinguished from solutions using the Tyndall effect.
Explanation:
When a suspension is allowed to stand, the particles separate. A colloid is a substance that exists between a solution and a suspension. A colloid will not separate from a suspension. The Tyndall effect can be used to distinguish colloids from solutions.
What is suspension?In chemistry, a suspension is a heterogeneous mixture of a fluid containing solid particles large enough to settle.
A suspension is a complex blend in which the solute particles do not disintegrate but rather become suspended throughout the bulk of the solvent and float freely in the medium.
A solution is a uniform mixture of one or more dissolved solutes in a solvent.
A solvent is a substance that dissolves a solute to produce a homogeneous mixture. The substance that dissolves in a solvent to form a homogeneous mixture is referred to as a solute.
A colloid is a mixture in which one substance is suspended throughout another, consisting of microscopically dispersed insoluble particles.
Larger particles in a suspension settle out, block or scatter light, and can be filtered out.
A colloid contains particles that are between the sizes of a solution and a colloid; they are not heavy enough to settle or be filtered out, but they still scatter light.
Thus, this way these three are related.
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The two angled ropes are used to support the crate in the picture. The sum of the tension in the ropes can have any value up to 1500 N. When the tension in the ropes exceeds 1500 N the rope will break. What is the largest mass the ropes can support?
Answers
Answer:
The largest mass is 170.7 Kg.
Explanation:
Given that,
Tension = 1500 N
We need to calculate the tension in the rope
Using balance equation
[tex]T_{1}\cos\theta=T_{2}\cos\theta[/tex]
Put the value into the formula
[tex]T_{1}\cos30=T_{2}\cos45[/tex]
[tex]T_{1}\dfrac{\sqrt{3}}{2}=\dfrac{T_{2}}{\sqrt{2}}[/tex]
[tex]T_{1}=\dfrac{\sqrt{2}}{\sqrt{3}}\times T_{2}[/tex]
If [tex]T_{2}=1500\ N[/tex]
[tex]T_{1}=\dfrac{\sqrt{2}}{\sqrt{3}}\times1500[/tex]
[tex]T_{1}=1224.74\ N[/tex]
We need to calculate the largest mass
Using balance equation
[tex]mg=T_{1}\sin30+T_{2}\sin45[/tex]
[tex]mg=1224.74\times\dfrac{1}{2}+1500\times\dfrac{1}{\sqrt{2}}[/tex]
[tex]mg=1673.03\ N[/tex]
[tex]m=\dfrac{1673.03}{9.8}[/tex]
[tex]m=170.7\ Kg[/tex]
Hence, The largest mass is 170.7 Kg.
How does a foam-filled winter coat help keep a person warm?
It slows down the transfer of thermal energy from outside to inside the coat.
It slows down the transfer of thermal energy from inside to outside the coat.
It speeds up the transfer of thermal energy from outside to inside the coat.
It speeds up the transfer of thermal energy from inside to outside the coat.
Answers
Answer: the answer is B. It slows down the transfer of thermal energy from inside to outside the coat
Explanation: I took the test and got this right:) Hope this helped!!
Answer:
B. It slows down the transfer of thermal energy from inside to outside the coat.
if Gabriel kicks the football 50 meters to the west in 3 seconds , what is the velocity of the football?
Answers
Answer:
velocity = 16.67[m/s]
Explanation:
To solve this problem we must use the following expression of speed, where we see the relationship between displacement and time.
velocity = displacement/time [m/s]
displacement = 50 [m]
time = 3 [s]
velocity = 50/3
velocity = 16.67[m/s]
A sports car accelerates at a constant rate from rest to a speed of 27.8 m/s in 8.00 s. What is the distance of
the sports car in this time interval?
Answers
Answer:
The answer is 222.4 mExplanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
distance = velocity × timeFrom the question
velocity = 27.8 m/s
time = 8 s
We have
distance = 27.8 × 8
We have the final answer as
222.4 mHope this helps you
a 9-volt battery is attached to a series circuit consisting of a 10-ohm resistor and 1-farad capacitor and a switch. when the switch closes the circuit, describe the original and final current through the ciricuit.
Answers
The initial and final current are both zero because direct current does not pass thru a capacitor:
Current thru a capacitor is described as:
i = -E/R e^-t / RC
When switch is first closed t = -0 and i - E/R = -9/10 = -.9 amps
Perhaps this is what was meant by "first closed"
As t goes to infinity i, in the circuit goes to zero
Answer:
correct answer is C on usatestprep
Explanation:
A device that converts mechanical energy into electrical energy
A. electromagnet.
B. telephone.
Answers
Answer:
A
Explanation:
Hope this helps. Please if you need more information let me know
Which of the following describe an electric motor?
Answers
Answer:
B. Changes electrical energy to mechanical energy.
Explanation:
We must make it clear that all the answers are correct, but yet answer B condenses the essence of the main objective of an electric motor. Electrical energy is converted into rotary motion of an axis, that rotational motion is considered a mechanical motion.
If a car is traveling 100 km/h west and comes to a stop in 3 min, what is the car's acceleration? Need procedure.
Answers
Answer:
a = 0.154 [m/s^2]
Explanation:
To solve this problem we must use the following formula of kinematics.
[tex]v_{f}= v_{i}-(a*t)\\[/tex]
where:
Vf = final velocity = 0
Vi = initial velocity = 100 [km/h]
t = time = 3 [min] = 180 [s]
Now we need to convert the velocity from [km/h] to [m/s]
[tex]100[\frac{km}{h} ]*1000[\frac{m}{1km} ]*1[\frac{h}{3600s} ]=27.77[\frac{m}{s} ][/tex]
0 = 27.77 - (a*180)
a = 0.154 [m/s^2]
Note: the negative sign of the equation shows, that the car slows down until it stops
Which statement is equivalent to Newton's first law? A. If no net force acts on an object, the motion of the object does not change. B. The force of an object is equal to the mass times its acceleration. C. The unit of force is the newton. D. For every action there is an equal and opposite reaction.
Answers
Answer:
A
Explanation:
Hi:)
If no net force acts on an object, the motion of the object does not change. This statement is equivalent to Newton's first law. Hence, option (A) is correct.
What is force?Physics defines force as the push or pull that modifies the velocity of a massed object. The ability to change a body's resting or moving condition is referred to as an external force.
According to Newton's First Law, a body in uniform motion or at rest will remain in that state up to and unless a net external force acts on it.
The key idea here is that an object will maintain a constant velocity if there is no net force produced by unbalanced forces operating on it.
Hence, if no net force acts on an object, the motion of the object does not change. This statement is equivalent to Newton's first law.
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How many electrons does sodium have?
O 23
O 12
O 13
O 11
Answers
Answer:
11
Explanation:
its 11 because protons and electrons have the same answer
Answer:
11
Explanation:
pls give brainliest
The primary coil of a transformer has 800 turns and the secondary coil has 8 turns. It is connected to a 220 volt a.c. supply. What will be the output voltage??
Don't Spam ^_^
-_+
Answers
Given :-
Primary voltage = 220 voltNo. of turns secondary turns = 8No. of primary turms = 800[tex] \\ \\ [/tex]
To find :-
Secondary voltage.[tex] \\ \\ [/tex]
We know:-
[tex] \boxed{ \rm\dfrac{E_s}{E_p}=\dfrac{N_s}{N_p}}[/tex]
where :-
E_s = Secondary voltageE_p = primary voltageN_s = No. of turns secondary turnsN_p = No. of primary turms[tex] \\ \\ [/tex]
So:-
[tex] \\ [/tex]
[tex] \dashrightarrow\sf\dfrac{E_s}{E_p}=\dfrac{N_s}{N_p}[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow\sf\dfrac{E_s}{220}=\dfrac{8}{800}[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow\sf\dfrac{E_s}{220}=\dfrac{8}{8 \times 100}[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow\sf\dfrac{E_s}{220}=\dfrac{\cancel8}{\cancel8 \times 100}[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow\sf\dfrac{E_s}{220}=\dfrac{1}{100}[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow\sf\dfrac{E_s}{1}=\dfrac{220}{100}[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow\sf{E_s}=\dfrac{220}{100}[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow\sf{E_s}=\dfrac{22\cancel0}{10\cancel0}[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow\sf{E_s}=\dfrac{22}{10}[/tex]
[tex] \\ \\ [/tex]
[tex] \dashrightarrow\bf{E_s}=2.2 \: volt[/tex]
hello humans ~
How can we find the wavelength of a wave?
Answers
Well, it depends on the subject matter:
Physics
[tex]\displaystyle \frac{v}{f} = \lambda[/tex]
The Grecian lettre, known as lambda [tex]\displaystyle [\lambda],[/tex]symbolises the wavelength, and is determined by the division of the frequency [tex]\displaystyle [expressed\:in\:Hz][/tex]and wave velocity [tex]\displaystyle [expressed\:in\:km/s, m/s, km/h, mi/h, etcetera].[/tex]The majourity of calculations are strictly perfourmed in metric units. If the frequency is in kilohertz [tex]\displaystyle [kHz][/tex]or the wave velocity is in kilometres per hour [tex]\displaystyle [km/h],[/tex]you must convert these quantities to Hertz and metres per second [tex]\displaystyle [m/s][/tex]by multiplying by 1000 [tex]\displaystyle [10\:kHz = 10000\:Hz].[/tex]
Mathematics [Calculus (Real-Word situations)]
[tex]\displaystyle F^{-1} = T[/tex]
Now, a prime example of a real-world situation is a Ferris Wheel. At any point you are told to write a cosine and\or sine equation, and you are given the frequency of a wave, [tex]\displaystyle F,[/tex]double it and set [tex]\displaystyle \pi[/tex]up against it because remember, in Physics, the formula for finding the wavelength in lengths of time is written above.
*If you need examples on this, check my past responces to real-world situations to regain that ideya of how to find the wavelength of trigonometric equations.
I am joyous to assist you at any time.
which of the following options best describes a solid object
Answers
Answer:
Which of the following correctly describes a solid? Explanation: A solid is defined as having a definite shape and definite volume. A liquid is defined as having a definite volume, but not a definite shape.
Which of the following units could represent acceleration?
a cm/h
b cm/s
c m/h
d km/h?
Answers
Answer:
To be precise; well, S.I. Unit of acceleration is m/s.
A 4kg ball that is moving straight upward has 20J of kinetic energy and its total mechanical energy is 32J. Find the gravitational potential energy of the ball
Answers
Answer:
h = 0.25 [m]v = 3.26 [m/s]
Explanation: In order to solve this problem, we must remember that mechanical energy is defined as the sum of kinetic energy plus potential energy.
Please help me
Have you ever sat high in the stadium at a baseball game and heard the sound of a ball being hit by a bat? Did you notice that you heard the sound after you saw the ball being hit?
Explain why you think this happened.
Answers
Answer:
Explanation:
The other answer is correct: the act of hitting a ball with a bat creates a sound. You see the act of hitting almost immediately because light travels very fast. The sound on the other hand travels much slower. So if you sit high in the stadium, the sound has to travel for a long distance before reaching you. That is why you hear the sound after you see the ball being hit.