Answer:
-150 kg m/s
Explanation:
The change of momentum is calculated as ;
Δp= m*Δv where
where
Δp= change in momentum
Δv = vf-vi
m= mass of the object
Change in momentum is also calculated when using the formula;
Δp = F * Δt when F is the net force applied and Δt is the time of action.
In this case;
m= 15 kg
vf= -10 m/s
vi= 0 m/s
Taking rightward direction to be positive, then leftward will be negative.
Applying the formula as;
Δp = m*Δv
Δp = 15 * { -10 -0} = 15*-10 = -150 kg m/s
Which part of the electromagnetic spectrum has a lower frequency than visible light? x-rays ultraviolet infrared gamma rays
The answer is infrared.
A skydiver, with a mass of 60 kg is falling at a velocity of 30 m/s. Calculate his kinetic energy.
Answer:
27000 J
Explanation:
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Answer:
i hate thissssssss schoooool
Explanation:
Two loudspeakers emit sound waves of the same frequency along the x-axis. The amplitude of each wave is a. The sound intensity is minimum when speaker 2 is 10 cm behind speaker 1. The intensity increases as speaker 2 is moved forward and first reaches maximum, with amplitude 2a, when it is 30 cm in front of speaker 1. What is What isThe amplitude of the sound (as a multiple of a) if the speakers are placed side by side?
Answer:
Explanation:
To find the amplitude of the sound, we must first determine the wavelength and the phase difference between the two speakers.
For the wavelength;
Recall that, the separation between two successive max. and min. intensity points are [tex]\dfrac{\lambda}{2}[/tex]
Thus; for both speakers; the wavelength of the sound is:
[tex]\dfrac{\lambda}{2} = (10+30) cm[/tex]
[tex]\dfrac{\lambda}{2} = (40) cm[/tex]
λ = 80 cm
The relation between the path difference(Δx) and the phase difference(Δ∅) is:
[tex]\Delta \phi = \dfrac{2 \pi}{\lambda}\Delta x + \Delta \phi_o[/tex]
where;
Δx = 10 cm
λ = 80 cm
Δ∅ = π rad
∴
[tex]\Delta \phi = \dfrac{2 \pi}{\lambda}\Delta x + \Delta \phi_o[/tex]
[tex]\pi \ rad = \dfrac{2 \pi}{80 \ cm}(10 \ cm) + \Delta \phi_o[/tex]
[tex]\pi \ rad = \dfrac{2 \pi}{8}+ \Delta \phi_o[/tex]
[tex]\pi \ rad = \dfrac{ \pi}{4}+ \Delta \phi_o[/tex]
[tex]\Delta \phi_o = \pi -\dfrac{ \pi}{4}[/tex]
[tex]\Delta \phi_o = \dfrac{ 4\pi - \pi}{4}[/tex]
[tex]\Delta \phi_o = \dfrac{ 3\pi}{4} \ rad[/tex]
Suppose both speakers are placed side-by-side, then the path difference between the two speakers is: Δx = 0 cm
Thus, we have:
[tex]\Delta \phi = \dfrac{2 \pi}{\lambda}\Delta x + \Delta \phi_o[/tex]
[tex]\Delta \phi = \dfrac{2 \pi}{\lambda}(0 \ cm ) + \dfrac{3 \pi}{4} \ rad[/tex]
[tex]\Delta \phi = \dfrac{3 \pi}{4} \ rad[/tex]
∴
The amplitude of the sound wave if the two speakers are placed side-by-side is:
[tex]A = 2a \ cos \bigg (\dfrac{\Delta \phi }{2} \bigg)[/tex]
[tex]A = 2a \ cos \bigg (\dfrac{\dfrac{3 \pi}{4} }{2} \bigg)[/tex]
[tex]A = 2a \ cos \bigg ({\dfrac{3 \pi}{8} } \bigg)[/tex]
A = 0.765a
The expressions for sound interference allows to find the amplitude for the wave when the two speakers are together is:
The amplitud is: A = 0.765a
Given parameters
Minimum interference speaker 2 behind speaker 1 is: Δr₁ = 10 cm Maximum interference haughty 2 in front of speaker 1 Δr₂ = 30 cmTo find
The amplitude if the speakers are side by side.
The interference phenomenon occurs when two coherent waves have paths of different lengths to reach a point, we have two extreme cases:
Constructive. When the waves arrive in phase, the expression is:Δr = [tex]2n \ \frac{\lambda}{2}[/tex]
Destructive. When the waves arrive with a phase difference of 180º, the expression isΔr = [tex](2n+1) \ \frac{\lambda}{2}[/tex]
Where Δr₁ and Δr₂ are the path difference, λ is the wavelength and n is an integer.
Let's start by looking for the wavelength that the speakers emit, see attached.
Destructive Interference Δr₂ = (2n + 1) la / 2
Constructive interference Δr₁ = 2n lam / s
Let's solve the system.
Δr₂ - Δr₁ = [tex]\frac{\lambda}{2}[/tex]
Let's calculate
30 - (-10) = [tex]\frac{\lambda}{2}[/tex]
λ = 80 cm
Now we can use the general relation for the path change and the phase.
[tex]\frac{\delta r}{\lambda } = \frac{\phi - \phi_o}{2\pi }[/tex]
[tex]\phi = \frac{\Delta r \ 2\pi }{\lambda } + \phi_o[/tex]fi = Dr 2pi / lam + fio
Where [tex]\phi[/tex] is the possible initial phase difference between the speakers.
Let's find the initial phase difference emitted by the two speakers, let's use destructive interference, for which the phase difference is:
[tex]\phi = \pi \ rad[/tex]
Let's calculate
[tex]\pi = \frac{2\pi }{80} \ 10 + \phi_o \\\phi_o = \pi - \frac{\pi}{4}[/tex]
[tex]\phi_o[/tex] = ¾ [tex]\pi[/tex] rad
This value is kept constant, let's find the phase angle for when the speakers are together, so the path difference is zero Δr = 0
[tex]0= \frac{\phi - \phi_o}{2\pi }\\\phi = \phi_o[/tex]
[tex]\phi[/tex] = ¾ pi
The amplitude of the sound wave is
A = 2a cos [tex]\frac{\phi}{2}[/tex]
A = 2a cos ⅜ π
A = 0.765 a
In conclusion using the expression for sound interference we can find the amplitude for the wave when the two speakers are together is:
A = 0.765a
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Can someone please help
Answer:
k nishant
Explanation:
the answer is option B
Mushroom rocks are:
Group of answer choices
A formed by grains of sand blown across the rocks' surfaces.
B rocks with many mushrooms growing around them.
C formed by wind and water erosion.
D All of the above.
You stand on a merry-go-round which is spinning at f = 0:25 revolutions per second. You are R = 200 cm from the center. (a) Find the angular speed ! At which it is spinning. (b) Find the centripetal acceleration, ac with which it is spinning. (c) What is the minimum coefficient of static friction is between your shoes and the floor that will keep you from slipping off?
Answer:
(a) ω = 1.57 rad/s
(b) ac = 4.92 m/s²
(c) μs = 0.5
Explanation:
(a)
The angular speed of the merry go-round can be found as follows:
ω = 2πf
where,
ω = angular speed = ?
f = frequency = 0.25 rev/s
Therefore,
ω = (2π)(0.25 rev/s)
ω = 1.57 rad/s
(b)
The centripetal acceleration can be found as:
ac = v²/R
but,
v = Rω
Therefore,
ac = (Rω)²/R
ac = Rω²
therefore,
ac = (2 m)(1.57 rad/s)²
ac = 4.92 m/s²
(c)
In order to avoid slipping the centripetal force must not exceed the frictional force between shoes and floor:
Centripetal Force = Frictional Force
m*ac = μs*R = μs*W
m*ac = μs*mg
ac = μs*g
μs = ac/g
μs = (4.92 m/s²)/(9.8 m/s²)
μs = 0.5
What is the difference between abiotic and biotic factors?
Answer:
Abiotic referfers to non-living and biotic factors are living or once living
Explanation:
Which piece of evidence from the article MOST appeals to the reader's sense of logic? A The app has funding from private foundations, the federal government and regional Indigenous governments. It now has more than 6,000 users. B One elder who makes a regular appearance on SIKU is 73-year-old Jimmy Iqaluq, who is an expert at "reading" sea ice. C Iqaluq's observation belies a wider phenomenon. In summer 2020, due to intense summer heat, sea ice in the Arctic melted to its second-lowest extent on record. D "[SIKU is] empowering people with tools that help document the data that's always been behind Inuit knowledge.
Answer:
C Iqaluq's observation belies a wider phenomenon. In summer 2020, due to intense summer heat, sea ice in the Arctic melted to its second-lowest extent on record.
Explanation:
Logic refers to the use of evidence to support one's argument. Statistics, facts, and data are used to back up the writer's argument. In the third option, the writer uses facts and figures to support his argument. He cited data on the Arctic melting in the summer of 2020.
The importance of logical reasoning is that the reader can reach a conclusion through the premises cited by the author. It is even more beneficial if the premises are data that can be verified.
A car travels at 10 m/s for 10 seconds. What distance does the car travel in this time?
Answer:
100 m
Explanation:
if the car travels at 10 m/s for 10 seconds it would travel 100 m during that time.
10*10 = 100
7. Complete the following table, comparing forces within atoms.
Electromagnetic force
Strong Nuclear Force
Weak force
Gravity
Electromagnetic powers versus Molecules:
Electrons are kept in the circle around the core by the electromagnetic power, in light of the fact that the core in the focal point of the particle is decidedly charged and pulls in the contrarily charged electrons.
Solid Nuclear power versus Molecules:
The solid atomic power holds most standard issue together on the grounds that it limits quarks into hadron particles, for example, the proton and neutron.
Feeble power versus Molecules:
In atomic material science and molecule physical science, the frail cooperation, which is additionally frequently called the powerless power or feeble atomic power, is the instrument of communication between subatomic particles that is liable for the radioactive rot of iotas.
Gravity Vs. Particles:
Gravity influences molecules a similar way it influences all other issue. Each iota makes its own gravitational field which draws in all other issue known to man.
A car moving at a speed of 20m/s has a kinetic energy of 300,000 J what’s the cars mass
Answer:
1500 kgExplanation:
The mass of the car can be found by using the formula
[tex]m = \frac{2k}{ {v}^{2} } \\ [/tex]
From the question we have
[tex]m = \frac{2 \times 300000}{ {20}^{2} } = \frac{600000}{400} = \frac{6000}{4} \\ [/tex]
We have the final answer as
1500 kgHope this helps you
What is a bond between a positive and a negative ion charge?
Answer:
Ionic Bond
Explanation:
Answer:
An ionic bond
help I’ll cash app you $5 if you get it right!
Answer: B and E
Explanation:
If an area has limited types of wildlife, this means that it has __________. A. animals that are about to go extinct B. animals that have adapted well to their environments C. a wide variety of animals D. very few varieties of animals Please select the best answer from the choices provided A B C D
Answer:
It is d
Explanation:
Answer:
D !!!!!
Explanation:
A toyota prius can go from 0 m/s to 30 m/s in 15 s. What is
its acceleration?
Select one:
2 m/s2
15 m/s2
30 m/s2
450 m/s2
Answer:
2m/s2
Explanation:
using v=u+at
a=(v-u)/t
=(30-0)/15
=2
PLEASE PLEASE PLEASE HELP FAST!!!!!!!!!!!!!!!
Answer:
I have examined the different parts of blub and I assume the answer is (D)T and U
Hope this helps you
Which formation moves sediment and erodes rock?
A.
volcanoes
B.
mountains
C.
glaciers
D.
cliffs
Answer:
C
Explanation:
Answer:
A
because volcano can produce sediment and
erodus rock
What is the kinetic energy of a 150 gram object moving at a velocity of 100 m/s?
Answer:
750 J
Explanation:
lets convert mass into kg first , 150 /1000 = 0.15 kg
kinetic energy = [tex]\frac{mv^{2} }{2}[/tex] = [tex]\frac{0.15*100^{2} }{2} = 750 J[/tex]
The kinetic energy will be 750 J for an object mass of 150 grams and the object moving at a velocity of 100 m/s.
What is Kinetic Energy?A moving item or particle might have power of a certain type called kinetic energy. When work, which entails the transfer of energy, is done on an object by applying a net force, that object acquires kinetic energy. The kinetic energy of a moving object or particle is a function of its mass and velocity of motion. Vibration, rotation around an axis, translation (or moving along a path from one place to another), or any combination of these might be considered motion.
According to the question, the given values are :
Mass, m = 150 gram or,
m = 150 /1000 = 0.15 kg and,
Velocity, v = 100 m/s.
As we know that the kinetic Energy = 1/2 mv²
K.E = 1/2 (0.15)(100)²
K.E = 1/2 (1500)
K.E = 750 J.
Hence, the kinetic energy will be 750 J.
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An object is dropped into a beaker containing liquid the object drops to the bottom of the beaker therefore
An object is dropped into a beaker containing liquid the object drops to the bottom of the beaker therefore the density of the object is greater than that of liquid inside the beaker.
What is density?The density of a substance indicates how dense it is in a given area. Mass per unit volume is the definition of a material's density. In essence, density is a measurement of how closely stuff is packed. It is a particular physical characteristic of a specific thing.
The Greek scientist Archimedes made the discovery of the density principle. The letter D can also be used to signify density instead of the symbol ρ .
According to Archimedes principle, if an object is dropped into a beaker containing liquid the object drops to the bottom of the beaker, the density of the object is greater than that of the liquid inside the beaker.
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How much work does a 25-newton force do to lift a potted plant from the floor to a shelf 1.5 meters high?
Answer:
37.5 N*m
Explanation:
w=fd
w=?
f=25 N
d=1.5 m
w=25N*1.5m=37.5 N*m
Can someone please check my answer
Answer:The answer is circular orbits I hope this helps
Explanation:
An object accelerates 12.0 m/s² when a force of 6.0 newtons is applied to it.
What is the mass of the object
Answer:
0.5 kgExplanation:
The mass of the object can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{6}{12} = \frac{1}{2} \\ [/tex]
We have the final answer as
0.5 kgHope this helps you
m = f/a
6 / 12 = 0.5
answer - 0.5
9.Two people are pushing a broken down car. One pushes 2 m/s east, the other a
1.5 m/s east. Do they have the same or different velocity? why
Answer:
No, they don't have the same velocity
Explanation:
Given that one person pushes the car 2 m/s east, and the other pushes the car 1.5 m/s east.
As velocity is a vector quantity, so, to have equal velocity, both magnitude as well as the direction must be equal.
For the first person:
Magnitute of the velocity = 2 m/s.
The direction of the velocity: Towards east.
For the second person:
Magnitute of the velocity = 1.5 m/s.
The direction of the velocity: Towards east.
As both the person have the same direction but the different magnitude of the velocity, so, they don't have the same velocity.
answer them all, please!!
Answer:
1 white blood cells
2 thyroid
3 bones
4 smooth, cardiac, skelatal
A 100N effort force is applied to a machine and lifts a 400N object. What is the MA of the machine?
Answer: dum dum
Explanat
A sound signal traveling underwater has a frequency of 230 hertz. The speed of sound underwater is 1.45 × 103 meters/second. What is the wavelength of the sound signal?
Wavelength = (wave speed) / (frequency)
= (1,450 m/s) / (230 / sec)
= 6.30 meters (rounded)
Hope this helped friend! :)
Answer the wave length is 263
Explanation
When liquid water gets into cracks of rock and freezes, it _____ and ______.
A contracts, splits apart the rock
B contracts, washes aways pieces of rock
C expands, splits apart the rock
D expands, washes away pieces of rock
Answer: it eventually cracks the rock and breaks pieces of the rock off
Explanation:
The force F⃗ pulling the string is constant; therefore the magnitude of the angular acceleration α of the wheel is constant for this configuration. Find the magnitude of the angular velocity ω of the wheel when the string has been pulled a distance d. Note that there are two ways to find an expression for ω; these expressions look very different but are equivalent.
Answer:
The answer is "[tex]\boxed{\boxed{\omega = \sqrt{\frac{2fd}{kmr^2}}}}[/tex]"
Explanation:
[tex]\to d= r \theta \\\\ \to \theta =\frac{d}{r}\\\\\to \omega^{r} - \omega_{0}^{r} = 2 \alpha \theta\\\\\to \omega^{r} = 2 \alpha \theta - \omega_{0}^{r} \\\\\to \omega^{r} = 2 (\frac{F}{Kmr}) \frac{d}{r}\\\\\to \omega = \sqrt{\frac{2fd}{kmr^2}}[/tex]
The angular velocity of the wheel is [tex]\omega=\sqrt{\frac{Fd}{mkr^2} }[/tex]
Angular Velocity :Given that the force applied is F, and the displacement of the string is d.
If the radius of the wheel is r and the wheel has an angular displacement of θ, then:
d = rθ
θ = d/r
now, the angular acceleration is given by:
α = F/mkr
The initial angular velocity will be zero and let the final angular velocity is ω.
According to the third equation of motion:
ω² = 0 + 2αθ
ω² = 2(F/mkr)(d/r)
[tex]\omega=\sqrt{\frac{Fd}{mkr^2} }[/tex]
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Suman climb a 5 metre high ladder in 10 second calculate his power the mass of his body is 50 kg
Answer:
245W
Explanation:
Given parameters:
Mass of his body = 50kg
Height of climb = 5m
Time = 10s
Unknown:
Power = ?
Solution:
Power is defined as the rate at which work is done;
Mathematically,
Power = [tex]\frac{work done}{time}[/tex]
Work done = mgh
m is the mass
g is the acceleration due to gravity
h is the height
Work done = 50 x 9.8 x 5 = 2450J
Power = [tex]\frac{2450}{10}[/tex] = 245W