Given :
A 1200 kg car initially traveling at 20 m/s increases its speed to 28m/s.
To Find :
How much work did the cars engine have to do to cause this change.
Solution :
We know, work done is given by :
Work Done = Final Kinetic Energy - Initial Kinetic Energy
[tex]Work \ Done = \dfrac{mv_f^2}{2} - \dfrac{mv_i^2}{2}\\\\Work \ Done = \dfrac{1200 \times 28^2}{2} - \dfrac{1200\times 20^2}{2}\\\\Work \ Done = 230400\ J\\\\Work \ Done = 230.4 \ kJ[/tex]
Therefore, work done by car engine is 230.4 kJ.
In the video, light passing through two slits creates a pattern of bright and dark fringes on a screen. The bright fringes result from __________; the dark fringes result from __________. In the video, light passing through two slits creates a pattern of bright and dark fringes on a screen. The bright fringes result from __________; the dark fringes result from __________. Diffraction, constructive interference Diffraction, destructive interference Constructive interference, destructive interference Diffraction, interference
Answer:
Constructive interference: destructive interference
Explanation:
Constructive interference occurs when waves are in phase or sync with one another and will lead to brighter and bolder results while destructive interference occurs when waves are out of phase with one another.
In this scenario, light passing through two slits creates a pattern of bright and dark fringes on a screen. The bright fringes result from constructive interference ; the dark fringes result from destructive interference.
I NEED HELP ASAP!! PLEASE
A skydiver falling towards Earth and is traveling at 19 m/s opens her parachute. She slows to a speed of 3 m/s The whole process takes only 2 seconds . What is her acceleration ? Explain why this acceleration is positive or negative
Answer:
Acceleration = -3m/s²
Explanation:
Given the following data;
Initial velocity = 19m/s
Final velocity = 3m/s
Time = 2secs
To find the acceleration;
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time. Mathematically, acceleration is given by the equation;
[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]
Substituting into the equation, we have;
[tex]a = \frac{3 - 9}{2}[/tex]
[tex]a = \frac{-6}{2}[/tex]
Acceleration = -3m/s²
The value for her acceleration is negative because she is decelerating i.e her final velocity is lower than her initial velocity.
3. The potential energy of an object is determined by: a. the movement of the object b. the position of the object c. the speed of the object d. Objects cannot have potential energy.
Answer:
B. the position of the object
This is a part of the biceps muscle. A.median head B.short head. C.Quadriceps
Answer:
c
Explanation:
A sound wave with speed of 375m/s find the temperature?
Answer:
The temperature of the gas is approximately 349.76980 K
Explanation:
The given parameter for the speed of the sound wave, v is v = 375 m/s
The formula for the speed of sound in a gas given the temperature of the gas, is given as follows;
[tex]v = 331.3 \times \sqrt{ \dfrac{T_K}{273 \ K } }[/tex]
Where;
[tex]T_K[/tex] = The temperature of the gas through which the sound travels
Therefore, for a speed of sound of 375 m/s, we have;
[tex]375 = 331.3 \times \sqrt{ \dfrac{T_K}{273 \ K } }[/tex]
[tex]T_K = 273 \ K \times \left (\dfrac{375}{331.3} \right )^2 \approx 349.76980 \ K[/tex]
[tex]T_K[/tex] ≈ 349.76980 K
The temperature of the gas, [tex]T_K[/tex] ≈ 349.76980 K.
A soap bubble is 77.1 nm thick and illuminated by white light incident perpendicular to its surface. What wavelength (in nm) and color of visible light is most constructively reflected, assuming the same index of refraction as water (nw
Answer:
0.41 μm or 410 nm
Explanation:
Given that
Soap thickness, t = 77.1 nm = 77.1*10^-9 m
Refractive index of water, μ = 1.33
The longest wavelength for constructive wavelength is given by the formula
2μt = (n - 1/2)λ
Making λ the subject of the formula gives
λ = 2μt / (n - 1/2), substituting the values, we have
λ = (2 * 1.33 * 77.1*10^-9) / 1/2
λ = (2.66 * 77.1*10^-9) / 1/2
λ = 2.05*10^-7 / 1/2
λ = 4.10*10*^-7 m
λ = 0.41 μm
The longest wavelength requested therefore is 0.41 μm or 410 nm
Two charged spheres are 389.66m away from each other. If one of the spheres has a charge of
3.371C and the force between the spheres is 479.66, what is the charge of the other sphere?
Remember coulomb's constant is 9 X 10^9.
Answer:
2.4 x 10⁻³C
Explanation:
Given parameters:
Distance = 389.66m
Q₁ = 3.371C
Electrical force = 479.66N
Unknown:
Q₂ = ?
Solution:
To solve this problem, we use the expression below:
F = [tex]\frac{k Q_{1} Q_{2} }{r^{2} }[/tex]
F is the electrical force
k is the coulomb's constant = 9 x 10⁹
Q is the charge
r is the distance
479.66 = [tex]\frac{9 x 10^{9} x 3.371 x Q_{2} }{389.66^{2} }[/tex]
Q₂ = 2.4 x 10⁻³C
what is the mechanical advantage of a pulley system
Answer:
Pulleys accomplish 2 separate operations throughout the computer controlled additional benefit technologies listed elsewhere here.
Explanation:
If indeed the pulley would be connected to that same attachment point, these are named a corrected pendulum or perhaps a change in direction. Its job should be to reverse the trajectory of that same rope pull. Unless the pulley would be connected to that same load, this same pulley seems to be a detachable as well as a mechanical additional benefit.Suppose you walk 21.5 m straight east and then 12.5 m straight north. How far are you from your starting point (in m)
Answer:
24.9 m
Explanation:
A triangle is a polygon with three sides and three angles. There are different types of triangles such as the equilateral triangle, isosceles triangle, scalene triangle, right angled triangle.
You walk 21.5 m straight east and then 12.5 m straight north. This forms a right angled triangle with a horizontal distance of 21.5 m, a vertical distance of 12.5 m and the hypotenuse is the distance between the ending and starting point. Let x represent the distance between the ending and starting point. Therefore using Pythagoras theorem:
x² = 21.5² + 12.5²
x² = 462.25 + 156.25
x² = 618.5
Taking square root of both sides:
√x² = √618.5
x = √618.5
x = 24.9 m = distance between the ending and starting point.
Multiple Choice Question About A Long Walk To Water
1. Where is Salva's father when Salva finds him in Chapter 17?
(a) In New York.
(b) In a church.
(c) In a clinic.
(d) At his home.
2. What does Salva study in college?
(a) Theater.
(b) Business.
(c) History.
(d) Geology.
3. Why does Salva lead the boys walking at night in Chapter 13?
(a) Because they fear the lions.
(b) Because they fear the crocodiles.
(c) Because there is more fighting during the day.
(d) Because the sun is too hot during the day.
4. How far is the nearest school from Nya's home?
(a) A half a day's walk.
(b) Two hours' walk.
(c) A full day's wall.
(d) An hour's walk.
5. From what tribe does Dep say the crew leader is descended in Chapter 18?
(a) Dinka.
(b) Jur-chol.
(c) Nuer.
(d) Shilluk.
6. Whose gentleness does Salva recall in Chapter 13?
(a) His mother's gentleness.
(b) His uncle's gentleness.
(c) His sisters' gentleness.
(d) His father's gentleness.
7. What kind of sports team does Salva join in Rochester?
(a) A volleyball team.
(b) A baseball team.
(c) A cricket team.
(d) A basketball team.
8. What is Nya holding while she waits in line in Chapter 18?
(a) A lollipop.
(b) A plastic bottle.
(c) A gourd.
(d) A book.
9. What do the village women gather for the crew in Chapter 12?
(a) Rocks.
(b) Twigs.
(c) Papyrus leaves.
(d) Squirrel pelts.
10. What is the crew leader leaning against while Nya watches him in Chapter 18?
(a) The pump.
(b) The school building.
(c) A truck.
(d) A tree.
11. For how long did Salva live at the first refugee camp in Kenya?
(a) For one year.
(b) For two years.
(c) For four months.
(d) For five years.
12. What does the crew leader reveal his name to be in Chapter 18?
(a) Ariik.
(b) Dep.
(c) Salva.
(d) Akeer.
13. The narrator says in Chapter 15 that in the part of Africa where Salva grew up, the temperature rarely dropped below what?
(a) 70 degrees.
(b) 80 degrees.
(c) 50 degrees.
(d) 60 degrees.
14. How old are the youngest boys in Salva's group in Chapter 13?
(a) Three.
(b) Five.
(c) Four.
(d) Two.
15. How many letters are there in the English alphabet?
(a) 28.
(b) 26.
(c) 30.
(d) 24.
A tightrope walker carries a longweighted pole. By doing this he creates a
Answer:
Balanced force, you have to have balance to be on a rope and carry a pole. Therefore he created a "balanced force".
Explanation:
Mark me as brainliest, tysm!
Parts of a transverse wave include:
Crest - the ___________ point on the wave
Trough - the _________ point on the wave
Wavelength - the __________ from one crest to the n3ext crest, or one trough to the next trough
Amplitude - the _________ of the wave from the midpoint to the highest point (crest) or the lowest point (trough)
Answer:
Parts of a transverse wave include:
Crest - the highest point on the wave
Trough - the lowest point on the wave
Wavelength - the distance from one crest to the next crest, or one trough to the next trough
Amplitude - the displacement of the wave from the midpoint to the highest point (crest) or the lowest point (trough)
Explanation:
Use the internet Brother
Answer:
Parts of a transverse wave include:
Crest - the highest point on the wave
Trough - the lowest point on the wave
the answer is: WAVELENGTH - the distance from one crest to the next crest, or one trough to the next trough
Amplitude - the displacement of the wave from the midpoint to the highest point (crest) or the lowest point (trough)
Explanation:
A arrow of mass 0.20 kg is shot at 32.2 m/s. It hits an apple (m = 0.77 kg), and goes through the apple, leaving with a velocity of 18.3 m/s.
What is the velocity of the apple after the arrow leaves it?
answer in m/s
Answer:
The apple travels at 3.6 m/s
Explanation:
The Law Of Conservation Of Linear Momentum
The total momentum of a system of bodies is conserved unless an external force is applied to it.
The formula for the momentum of a body with mass m and speed v is:
P = mv
If we have a system of two bodies the total momentum is the sum of the individual momentums:
[tex]P=m_1v_1+m_2v_2[/tex]
If a collision occurs and the velocities change to v', the final momentum is:
[tex]P'=m_1v'_1+m_2v'_2[/tex]
Since the total momentum is conserved, then:
P = P'
Or, equivalently:
[tex]m_1v_1+m_2v_2=m_1v'_1+m_2v'_2[/tex]
Solving for v2':
[tex]\displaystyle v'_2=\frac{m_1v_1+m_2v_2-m_1v'_1}{m_2}[/tex]
The arrow has a mass of m1=0.2 kg and travels at v1=32.2 m/s. It hits an apple (assumed stationary at v2=0) of mass m2=0.77 kg and continues through the apple with a speed of v1'=18.3 m/s. We'll calculate the speed of the apple after the hit.
[tex]\displaystyle v'_2=\frac{0.2*32.2+0.7*0-0.2*18.3}{0.77}[/tex]
[tex]\displaystyle v'_2=\frac{2.78}{0.77}[/tex]
[tex]v'_2=3.6 \ m/s[/tex]
The apple travels at 3.6 m/s
PSYCHOLOGY:
A mnemonic device is a strategy used to improve memory.
True or false.
Answer:
True
Explanation:
A mnemonic device is a method employed to make the memory have the ability to remember things, improve the memory, and generally improve the long term ability of the memory such that the brain develops more ability to store information until when needed and collect the stored information when needed. This is achievable when the information that needed to be remembered are stored using rhymes of songs, abbreviations of words using the initial letters. For example, "MR NIGER D" can be used to store the characteristics of living things like:
M - movement
R - Respiration
N - Nutrition
I - Irritability
G - Growth
E - Excretion
R - Reproduction
D - Death
Answer:
true
Explanation:
edge2020
As a stop light changes from red to green, a car starts to cross through the intersection. An instant before it begins to move, its velocity is zero. Must its acceleration at that time also be zero. Why or why not
Answer:
Yes, the acceleration at that time is also zero because the velocity is zero.
Explanation:
To answer the question given above, we shall determine the acceleration of the car at time 't' when the velocity is zero.
From the question given above, the following data were obtained:
Velocity (v) = 0 m/s
Time (t) = t
Acceleration (a) =?
Acceleration is defined as:
Acceleration (a) = Velocity (v) / time (t)
a = v/t
a = 0/t
a = 0
From the above illustration, we can see that the acceleration is zero irrespective of the time 't'.
Therefore, the acceleration of the car will be zero since the velocity of the car at time 't' is zero.
Match these names with the correct statements. 1. said sun revolved around earth Clyde Tombaugh 2. said earth revolved around sun Tycho Brahe 3. analyzed motions of planets William Herschel 4. first used refracting telescope for astronomy Isaac Newton 5. invented reflecting telescope Albert Einstein 6. discovered the planet Uranus Galileo Galilei 7. discovered the planet Neptune Johann Galle 8. discovered Pluto Ptolemy 9. developed special and general theories of relativity Grote Weber 10. demonstrated that the universe is expanding Nicolaus Copernicus 11. discovered radio waves from center of Milky Way Edwin Hubble 12. amateur astronomer who built the first radio telescope Karl Jansky
Answer:
1. Ptolemy.
2. Nicolaus Copernicus.
3. Tycho Brahe
4. Galileo Galilei
5. Isaac Newton
6. William Herschel
7. Johann Galle
8. Clyde Tombaugh
9. Albert Einstein.
10. Edwin Hubble
11. Karl Jansky.
12. Grote Weber.
Explanation:
1. Ptolemy: said sun revolved around earth.
2. Nicolaus Copernicus: aid earth revolved around sun.
3. Tycho Brahe: analyzed motions of planets.
4. Galileo Galilei: first used refracting telescope for astronomy.
5. Isaac Newton: invented reflecting telescope.
6. William Herschel: discovered the planet Uranus.
7. Johann Galle: discovered the planet Neptune.
8. Clyde Tombaugh: discovered the dwarf planet Pluto.
9. Albert Einstein: developed special and general theories of relativity.
10. Edwin Hubble: demonstrated that universe is expanding.
11. Karl Jansky: discovered radio waves from the center of the Milky Way.
12. Grote Weber: an amateur astronomer who built the first radio telescope.
A lightbulb is rated to how a power output of 80 w, if the lightbulb is running for 600 seconds, how much energy (work) is it using?
Answer:
Light bulbs are rated in watts to indicate how much energy they consume. Does the wattage of a light bulb have anything to do with brightness? ... In general, that works well with traditional incandescent light bulbs. ... It's also worth noting that kW can be synonymous with “demand” if you're talking to a utility ...
Explanation:
Light bulbs are rated in watts to indicate how much energy they consume. Does the wattage of a light bulb have anything to do with brightness? ... In general, that works well with traditional incandescent light bulbs. ... It's also worth noting that kW can be synonymous with “demand” if you're talking to a utility ...
What is an
example of a
"source" of
thermal
energy?
Answer:
4.1 Introduction. Our modern society depends heavily on thermal energy sources derived mostly from coal, petroleum, and natural gas combustion.
Other than nuclear power plants and nuclear weapons, are there any other uses for fission?
Answers
The first power station to produce electricity by using heat from the splitting of uranium atoms began operating in the 1950s. · The applications of nuclear technology
How is energy stored in food?
Answer: There are little tiny batteries that are contained within the molecules of the food. The sun charges these batteries, and when the food is eaten, the energy from the batteries flows through the acids in the stomach, which gives the person or animal energy. In gasoline, the energy is created when the gasoline is set on fire and burned, there is no energy within it already. So they are different forms of energy. Hope this helps!
Answer:
Energy is stored in food as molecular bonds
Explanation:
Energy rich molecules are Glycogen, carbohydrates, triglycerides, and lipids are energy storage molecules,
explain the relationship between
the number of ions and the scale.
Answer:
The pH of a system is dependent on the concentration of hydrogen ions present in that system. The concentration of hydrogen ions in a solution is the amount of hydrogen ions (in the units of mol) present in a liter of solution.
Explanation:
Follow the motion of a single crest how does the crest move
Answer:
In a transverse wave, the motion of the medium (what the wave moves through—in this case, the spring) is perpendicular to the direction of the wave. So, each point of the spring moves up and down as the wave travels from left to right.
Explanation:
this is a very difficult to say
Pam, with a mass of 40.4 kilograms, straps on a rocket pack while wearing her roller blades. The rocket supplies a constant force for 26.7 meters, and Pam acquires a speed of 26.0 meters per second. a. What is Pam's final kinetic energy
Answer:
13.66 kJ
Explanation:
Given that
Mass of Pam, m = 40.4 kg
Distance moved by the force, d = 26.7 m
Speed attained by Pam, v = 26 m/s
The kinetic energy is given by the formula, K.E = 1/2 mv², where
K.E = the needed kinetic energy
m = mass of the object(Pam)
v = velocity of the object(Pam)
Applying the formula, we have
K.E = 1/2 * 40.4 * 26²
K.E = 20.2 * 676
K.E = 13655.2 J
The Kinetic Energy is 13.66 kJ
A car travels for 5.5 h at an average speed
of 75 km/h. How far did it travel?
T TE
Answer:
[tex]\boxed {\boxed {\sf 412.5 \ kilometers }}[/tex]
Explanation:
Distance is the product of speed and time.
[tex]d=s*t[/tex]
The speed of the car is 75 kilometers per hour. It traveled for 5.5 hours.
[tex]s= 75 \ km/hr \\t= 5.5 \ hr[/tex]
Substitute the values into the formula.
[tex]d= 75 \ km/hr * 5.5 \ hr[/tex]
Multiply. Note that the hours will cancel each other out.
[tex]d= 75 km * 5.5 \\d= 412.5 \ km[/tex]
The car travelled 412.5 kilometers.
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In a 2 dimensional Cartesian system, the x-component of a vector is known, and the angle between vector and x-axis is known. Which operation is used to calculate the magnitude of the vector? (taken with respect to the x-component)
The moving part of a speaker goes in and out 400 times per second. The frequency of the sound produced is:
a
4 hertz.
Ob
40 hertz.
400 hertz.
4,000 hertz.
How does the Greenhouse Gas Emissions mitigate climate change? Explain.
Answer:
Climate change mitigation consists of actions to limit the magnitude or rate of global warming and its related effects. An increase in the atmospheric concentrations of greenhouse gases produces a positive climate forcing, or warming effect. From 1990 to 2015, the total warming effect from greenhouse gases added by humans to the Earth's atmosphere increased by 37 percent
A Brain Exercise is where:
The diagram below shows two points of a wave.
How many wavelengths separate point A and point B?
Group of answer choices
1.5
2.0
3.0
2.5
There are two and half wavelengths, separate point A and point B. The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.
What is wavelength ?The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.
The wavelength is calculated as;
[tex]\lambda= 1+1+\frac{1}{2} \\\\ \lambda =2.5[/tex]
There are 2.5 wavelengths, separate point A and point B.
Hence, option D is correct.
To learn more about the wavelength, refer to the link;
brainly.com/question/7143261
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