Answer:
[tex]5.12\:\text{m/s}[/tex]
Explanation:
From the conservation of momentum, the total momentum of the system before and after the collision must be the same. Therefore, let the momentum of Homeboy Joe be [tex]p_b[/tex] and let the mass of Homegirl Jill be [tex]p_j[/tex]. We can write the following equation:
[tex]p_{bi}+p_{ji}=p_{bf}+p_{jf}[/tex], where subscripts [tex]i[/tex] and [tex]f[/tex] represent initial and final momentum respectively.
The momentum of an object is given by [tex]p=mv[/tex].
Therefore, we have:
[tex]m_{b}v_{bi}+m_{j}v_{ji}=m_{b}v_{bf}+m_{b}v_{jf}[/tex] (some messy subscripts but refer to the values being plugged in you're confused what corresponds with what).
Plugging in values, we have:
[tex]99.5\cdot 6.65 + 68.8\cdot (-1.10)=99.5\cdot 2.35+ 68.8\cdot v_{jf}[/tex].
Solving, we get:
[tex]v_{jf}=\frac{99.5\cdot 6.65+68.8\cdot (-1.10)-99.5\cdot2.35}{68.8},\\v_{jf}=5.11875,\\v_{jf}\approx \boxed{5.12\:\text{m/s}}[/tex].
It's important to note that velocity is vector quantity, so the negative velocity assigned to Jill simply implies she is moving at [tex]1.10\:\text{m/s}[/tex] in the opposite of Joe's direction. After the collision, she is now moving [tex]5.12\:\text{m/s}[/tex] in the same direction that Joe was initially moving, due to Joe's relatively large mass and initial velocity.
The brakes of a 2000 kg car apply a force of 250 N to slow down a car as it comes off of an exit ramp. What is the acceleration of the car?
Question 4 (1 point)
How far does a sound wave travel in 3 seconds if the air temperature is 30 degrees
Celsius?
a) 114.33 m
b) 1047 m
c) 1029 m
d) 116.33 m
Answer:
B
Explanation:
v=349m/s
d=vt
d=349*3
d=1047m
WHY 349??
Because, velocity of sound increases about 0.6 m/s for every 1 degree celsius rise in temp.
Velocity of sound is about 343 m/s at 20 degrees C, so 0.6*10=6 more m/s, or 349 m/s. Kinda cool how temperature alters the speed of sound!
Are acceleration and force proportional or inversely proportional values?
Answer:
Yes, acceleration and force are directly proportional to each other.
Explanation:
The force acting on an object is given by :
F = ma
Where
m is mass
a is acceleration
It can be clear from the above formula that the acceleration and the force are directly proportional to each other.
A sharpening wheel is traveling at 5 rad/s, it slows down to rest in 30 seconds while sharpening an axe. What is its angular acceleration?
Answer:
Angular acceleration [tex]= 0.167[/tex] rad/s^2
Explanation:
Given
Initial Angular velocity (w1) [tex]= 5[/tex] rad/s
Final Angular velocity (w2) [tex]= 0[/tex] rad/s
Time taken to change velocity from w1 to w2 [tex]= 30[/tex] seconds
Angular acceleration is equal to the change in angular velocity to the time taken for making thing change
Hence, Angular acceleration
[tex]\frac{w_2 -w_1}{t} \\\frac{5-0}{30}\\0.167[/tex]rad/s^2
How do the temperature curves in your graph show the range of temperature?
Answer:
Step-by-step Explanation:
The kinetic energy of a body moving at a speed of 10 m / s is equal to 1000 J. What is the body mass
Answer:
m = 20 kg
Explanation:
Given that,
The speed of a body, v = 10 m/s
Kinetic energy of the body, K = 1000 J
We need to find the mass of the body. The formula for the kinetic energy of a body is given by :
[tex]K=\dfrac{1}{2}mv^2\\\\m=\dfrac{2K}{v^2}\\\\m=\dfrac{2\times 1000}{(10)^2}\\\\m=20\ kg[/tex]
So, the mass of the body is equal to 20 kg.
PLEASE HELP! WILL MARK BRAINLIEST!
Two kids are roller skating. Amy, with a mass of 55 kg, is traveling forward at 3 m/s. Jenny, who has a mass of 40 kg, is traveling in the opposite direction at 5 m/s. They crash into each other and hold onto each other so that they move as one mass. How fast are they traveling? How would you find your answer?
Answer:
They traveling at along the direction of 55 kg kid.
Step-by-step explanation:
Conservation of momentum-
Momentum of a system is constant if there are no external forces acting on the system.
As they crash into each other and hold onto each other so that they move as one mass and no other force is acting on them, so conservation of momentum can be applied here.
The final direction of velocity will be opposite to the assumed direction of the mass of 40 kg.
This is a conservation of momentum problem. The equation relevant here is
[tex]\[m_1v_1+m_2v_2=\left ( m_1+m_2 \right )v_f\][/tex]
where m is the mass and v is the velocity. Because Amy and Jenny move as one mass after crashing (or colliding) with each other, this is an inelastic collision. What we to find is the final velocity, [tex]v_f[/tex], of both Amy and Jenny as a single body.
[tex]v_f=\frac{m_1v_1+m_2v_2}{\left ( m_1+m_2 \right )} = \frac{(55)(3)+(40)(5)}{(55+40)} = \text{3.84 m/s}.[/tex]
URGENT PLEASE HELP!!!! GIVING BRAINLIEST!! If you answer this correctly ill answer some of your questions you have posted! (30pts)
Answer:
5
Explanation:
From the attachement,
M.A = Load(L)/Effort(E)
M.A = L/E...................... Equation 1
Where M.A = .Mechanical Advantage, L = Load, E = Effort.
Given: L = 500 N, E = 100 N
Substitute these values into equation 1
M.A = 500/100
M.A = 5.
Hence the actual mechanical advantage of the pulley is 5
please help!
A proton moves perpendicularly to a magnetic field that has a magnitude of 4.20 x 10-2 T. What is the speed of the particle if the magnitude of the magnetic force on it is 2.40 x 10-14 N?
Answer:
V=3.57 × 10^6 m/s
hope it is helpful..
The speed of the proton in the magnetic field is 3.57×10⁶ m/s.
To determine the speed of the proton, we need to know about the magnetic force experienced by a charged particle in a magnetic field.
What is the magnetic force on a charge particle in a magnetic field?From lorentz law, the magnetic force on a charge particle is given asF=q×v×B
where, q= charge of the particle
v= speed of the particle
B= magnetic field
What will be the speed of the charge particle, proton, if the magnetic field and force are given?Magnetic force(F)= q×v×Bv=F/(q×B)
Here, B= 4.20×10⁻²TF=2.40×10⁻¹⁴N
q= 1.6×10⁻¹⁹C
Then, v= 2.40×10⁻¹⁴/ ( 4.20×10⁻²× 1.6×10⁻¹⁹)
= 3.57×10⁶ m/s.
Thus, we can conclude that the speed of the proton in the magnetic field is 3.57×10⁶ m/s.
Learn more about the magnetic force here:
https://brainly.com/question/25932320
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How much potential energy does a 4 kg object have that is 5 meters off the ground?
math pls help
Which is the correct definition for sea floor spreading
Do all force interactions cause a noticeable change in motion? Explain your thinking?
!THANK YOU!
Answer:
No. If you apply a force in a chair, for example, you only will be able to move the chair if you beat the static frictional force. So, with that example, we can see that is not any type of force that can produce movement. The only force that produces movement is a result force which is non-zero.
someone help please !!
Answer:
c.
is the answer please brainliest
HELP PLZ
What would it mean if an object had no potential energy?
A battery sends a current through a metal wire.
The current in a wire is 3.7 A.
Calculate the charge that flows into the wire in 13 s
Answer:
I hope this a little bit.
What are the three forms of water discussed in the passage?
Answer:
The three forms of water are gas, liquid, and ice, I'm not sure if these were mentioned in the passage since you did not attach a picture.
Please mark this the Brainliest.
I got stuck on this question
Answer it 2n
Explanation:
With this pandemic, have you gained a new appreciation for your education
Answer
YESSS. my education went down hill since the pandemic :(
Explanation:
Does the earth have mass
Answer:
yes it does
Explanation:
it's not like Balloon it is a solid so it the earth does have a mass
A car weighs 11000 N on Earth. What is its mass?
A) 300 kg
B) 1122 kg
C) 0 kg
D) 107,800 kg
what is acceleration
Answer: acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.
Explanation:
Which two statements describe what happens in both nuclear fusion and
nuclear fission reactions?
A. Each nucleus formed has fewer protons than the original nucleus
had.
B. Nuclei with small masses combine to form nuclei with larger
masses.
C. Radiation is released from the nuclei that undergo a reaction.
D. A small amount of the mass in each nucleus that undergoes a
reaction is converted to energy.
Answer:
C. Radiation is released from the nuclei that undergo a reaction.
D. A small amount of the mass in each nucleus that undergoes a
reaction is converted to energy.
Two statements, that describe what happens in both nuclear fusion and nuclear fission reactions, are:
Radiation is released from the nuclei that undergo a reaction.A small amount of the mass in each nucleus that undergoes a reaction is converted to energy.Hence, option (C) and (D) are correct.
What is nuclear reaction?A nuclear reaction is a process in nuclear physics and nuclear chemistry where two nuclei or a nucleus and an outside subatomic particle meet to create one or more new nuclides. Consequently, at least one nuclide must change throughout a nuclear reaction.
Instead of being referred to as a nuclear reaction, the process is simply referred to as a sort of nuclear scattering if a nucleus interacts with another nucleus or particle and they subsequently separate without altering the nature of any nuclide.
Learn more about nuclear reaction here:
https://brainly.com/question/16526663
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URGENT PLEASE HELP!!!! GIVING BRAINLIEST!! If you answer this correctly ill answer some of your questions you have posted! (29pts)
Chemical=B
Mechanical=C
Nuclear=A
Electromagnetic=D
Thermal=E
I think these are right but if not I’m sorry
Hope I helped :]
As a cold air mass advances on a warm air mass, what usually comes before it?
Answer: A cold front occurs when a cold air mass advances into a region occupied by a warm air mass. If the boundary between the cold and warm air masses doesn't move, it is called a stationary front.
Explanation: Two types of occluded front exist: the warm-type and the cold-type. They’re distinguished by the relative temperatures of the air mass ahead of the occlusion – in other words, the air mass ahead of the original warm front – and the air mass behind the cold front. If the air behind the cold front is colder than the air ahead of the occlusion, it shoves beneath that air (because it’s denser) to form a cold-type occluded front. If the air behind the cold front is warmer than the air ahead, it rides over it to form a warm-type occluded front – which appears to be the more common case. In either situation, the lighter warm air representing the air mass originally between the warm and cold fronts sits above the boundary between the two cooler air masses.
Hope this helps!!
If you have chance to rearrange the periodical table, what is the style of it?
if i had chance to rearrange thw periodical table i would arrange like this because it's not fair to change it it's a fact
A hair dryer is rated at 1.2kW. When it is plugged into a standard outlet and turned on, what is the current in the hair dryer?
Answer:
1200 watts at a standard 120v draws 10 amps
Narcotics are highly addictive and affect the driver's
Oa) decision making
Ob) vision
Oc) motor skills
Od) all of the above
Answer:
D
that's should be the answer
How would a weaker jet stream help to cause extreme flooding?(1 point)
Answer:
It would allow storm systems to stall in an area.
Answer: A weaker jet stream would allow storm systems to stall in one area.
How do vaccines provide immunity
Answer:
Vaccines contain weakened or inactive parts of a particular organism (antigen) that triggers an immune response within the body. Newer vaccines contain the blueprint for producing antigens rather than the antigen itself.
Answer: They give you a portion of the thing its fighting so it gets your cells use to it so they can fight it off easily
Explanation:
The current in the wires of a circuit is 180.0 milliAmps. If the
voltage impressed across the ends of the circuit was doubled
and the resistance was one-third the original value, then its
new current would be _____milliAmps.
Explanation:
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