Kinetic energy = (1/2) (mass) (speed)²
The coaster's original kinetic energy was
KE = (1/2) (2,000 kg) (10 m/s)²
KE = (1,000 kg) (100 m²/s²)
KE = 100,000 kg-m²/s²
old KE = 100,000 joules
After something slowed it down, its new kinetic energy is
KE = (1/2) (2,000 kg) (6 m/s)²
KE = (1,000 kg) (36 m²/s²)
KE = 36,000 kg-m²/s²
new KE = 36,000 joules
The coaster lost (100,000 - 36,000) = 64,000 joules of KE.
Energy is conserved. It can't evaporate, disappear, or be destroyed.
That 64,000 joules had to go somewhere.
Someone or something had to do 64,000 joules of work on it in order to slow it down.
The work done by the external force on the roller coaster is 64000 J.
How do you calculate the work done on the roller coaster?Given that the mass of The roller coaster is 2000 kg and its velocity is 10 m/s. The kinetic energy of the roller coaster is given below.
[tex]KE = \dfrac {1}{2}mv^2[/tex]
[tex]KE = \dfrac {1}{2}\times 2000\times (10)^2[/tex]
[tex]KE = 100000 \;\rm J[/tex]
Since the roller coaster has a force of unknown magnitude which decreases its speed to 6 m/s. For this decreased speed, the kinetic energy is given as below.
[tex]KE'= \dfrac {1}{2}mv'^2[/tex]
[tex]KE'= \dfrac {1}{2}\times 2000\times 6^2[/tex]
[tex]KE' = 36000\;\rm J[/tex]
The work done on the roller coaster is calculated by the change in the kinetic energy for both speeds.
Work Done = KE - KE'
Work = 100000 - 36000
Work = 64000 J
Hence we can conclude that the work done by the external force on the roller coaster is 64000 J.
To know more about the work, follow the link given below.
https://brainly.com/question/3902440.
The shape of a mineral has to do with
A.
its smell.
B.
its color.
C.
the way its crystals are formed.
D.
how easy it is to scratch.
Answer:
C is the correct answer
Which sentence best explains the difference between potential energy and
kinetic energy?
A. Potential energy is related to an object's position, and kinetic
energy is related to its motion.
B. Potential energy is related to an object's motion, and kinetic
energy is related to its position.
C. Potential energy is related to an object's position, and kinetic
energy is related to the arrangement of its particles.
O D. Potential energy is related to an object's shape, and kinetic energy
is related to its position.
Answer:
C. Potential energy is related to an object's position, and kinetic
Explanation:
The energy contained in the small motions of the object's molecules can be broken up into a combination of microscopic kinetic energy and potential energy.
Answer:
c. potential energy is related to an object's position, and kinetic energy is related to its motion
Explanation:
A solid weight 277.5g in air and 212.5g when totally immersed in the liquid of density 0.9 g/cm³.Calculate the density of solid.
help me Asap!!
Explanation:
Here is the answer,
Lets be BF
The density of solid is 3.842 g/cm³.
What is Density ?
Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume.
Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.
Weight in air = 277.5Weight in water = 212.5Displaced Weight = 277.5 - 212.5
= 65 gm
Density = 0.9 g/cm³
Mass = 65 gm
Volume = Mass / Density
= 65 / 0.9
= 72.22 cm³
Now,
Density of Solid = 277.5 / 72.22
= 3.842 g/cm³.
Hence , The density of solid is 3.842 g/cm³.
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When the velocity of a liquid flowing steadily in a tube increases what happens to the pressure
Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases. The Bernoulli's Principle explains the behavior of an ideal fluid passing through a pipe or enclosed passageway such a pump.
lonic compounds form because ______ attract.
Plz help I need this now! :)
Answer:
I believe it is either Metals or Nonmetals
Explanation:
Hope this helped, Have a Wonderful Day/Night!!
A driver travels 225 miles in 4 hours and 30 minutes. What was his average speed in mph?
Answer:
195 is it current pls tell
At the first Democratic Party convention of 1860, fifty Southern delegates refused to vote and left the convention. voted to secede from the Union. nominated their own candidate. decided to become Republicans.
Answer:
A) refused to vote and left the convention.
Explanation:
At the first Democratic Party convention of 1860, fifty Southern delegates refused to vote and left the convention
Answer:
The answer is A
Explanation:
got it right edge 2021
Im so bad at physics pls help I am so close to failing.
Answer:
the canon would be blasted .4/6 miles bc it s half of 9.8 which shows its signifigant expretion on the decimal point weather its a posative or negative
Explanation:
Hopefully this helped, if not HMU and I will try my best to get u a better answer!
Have a great day! :)
And if ur failing and u need help I can help u, no points needed :)
In many situations, energy is lost to the work done by friction. But the law of conservation of energy says energy cannot be created or destroyed. So where does the "lost" energy go?
Answer:
Heat energy
Explanation:
The seemingly lost energy due to the work done by friction is lost to heat energy.
When we account for heat energy of the system, it is clearly seen that it is not lost as we perceive it.
The law of conservation of energy also suggests that energy is transformed and neither lost nor created. The work done by friction is transformed into heat energy of the system.3. When two liquids are mixed and a solid
forms as a reaction, the solid is called a
A. precipitate
B participant
C. percipitate
D. polypeptide
And why ?
Answer: A; Precipitate
Explanation:
Red: Distance = 3 x Time
Blue: Distance = 2 x Time
A student is asked to predict the time it would take for the blue marble to travel 4 meters. What is the time?
A hiker leaves her camp and walks 3.5 km in a direction of 55° south of west to the lake. After a short rest at the lake, she hikes 2.7 km in a direction of 16° east of south to the scenic overlook.
What is the magnitude of the hiker’s resultant displacement? Round your answer to the nearest tenth.
km
What is the direction of the hiker’s resultant displacement? Round your answer to nearest whole degree.
° south of west
Answer:
The magnitude of the hiker’s resultant displacement is 5.6 km
The direction of the hiker’s resultant displacement is 77 degrees south west! Hope this helps!!!
Energy Calculation 4. What is the gravitational potential energy of an object that has a mass of 100kg it is 10m off of the ground? The gravity on Earth is measured at 9.8N/kg
The radio waves that travel through the air to our car/truck/home radios are just another type of light. Let's say that your favorite radio station is 87.9 on the FM dial. That means that those radio waves have a frequency of 87.9 MHz. (a) What are the wavelength and energy of those radio waves? (b) How fast would these radio waves travel through water?
Answer:
Explanation:
(a) Electromagnetic waves travels at the speed of light = 3.0 x [tex]10^{8}[/tex] m/s.
v = fλ
where v is the velocity of the wave, f is the frequency, and λ wavelength.
So that;
λ = [tex]\frac{v}{f}[/tex]
= [tex]\frac{3.0*10^{8} }{87.9*10^{6} }[/tex]
= 3.413 m
ii. Enegy of the wave can be determined by;
E = hf
where h is the Planck's constant and f the frequency of the wave.
E = 6.626 x [tex]10^{-34}[/tex] x 87.9 x [tex]10^{6}[/tex]
= 5.82 x [tex]10^{-26}[/tex] J
(b) Refractive index of water = [tex]\frac{velocity of light in air}{velocity of light in water}[/tex]
velocity of light in water = 1.33 x 3.0 x [tex]10^{8}[/tex]
= 3.99 x [tex]10^{8}[/tex] m/s
Are three coefficients of expansion alpha bita and gamma universal constant?
Answer:
As the temperature increases, the volume of the material also increases. This is known as thermal expansion. It can also be explained as the fractional change in the length or volume per unit change in the temperature.
The relation between alpha, beta, and gamma is given in the form of a ratio and the ratio is 1:2:3 and can be expressed as:
alpha=fracbeta2=fracgamma3
Following is the relation between the three:
L = L (1 + α.ΔT)
Where, α is the coefficient of linear expansion
A = A (1 + β.ΔT)
Where, β is the coefficient of aerial expansion
V = V (1 + γ.ΔT)
Where, γ is the coefficient of cubical expansion
V = V + γV.ΔT
V = V (1 + γ.ΔT)
L3 = L3 (1 + α.ΔT)3
L3 = L3 (1 + 3α.ΔT + 3α2.ΔT2 + α3.ΔT3)
L3 = L3 (1 + 3α.ΔT)
Alpha, beta, and gamma are related to one another in the form of a ratio, and that ratio is 1:2:3, and yes they are universal constants.
What is expansion?A substance's volume expands while its mass stays constant. Heating is typically the cause of expansion. When a substance is heated, the molecular bonds separating its particles weaken, the particles move more quickly, and the substance expands as a result.
Determine the relation as shown below,
L = L (1 + α × Δ T)
here, α is the coefficient of linear expansion
A = A (1 + β × Δ T)
here, β is the coefficient of aerial expansion
V = V (1 + γ × Δ T)
here, γ is the coefficient of cubical expansion
V = V + γ × V × Δ T
V = V (1 + γ × ΔT)
L3 = L3 (1 + α × Δ T)3
L3 = L3 (1 + 3α × ΔT + 3α2 × ΔT2 + α3 × ΔT3)
L3 = L3 (1 + 3α × Δ T)
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Sa ma ajute cineva va rog mult Ce cantitate de apă poate fi încălzită de la temperatura t 1 = 10 0 C la temperatura finală T 2 = 293, 15 K, dacă i se furnizează căldura de 41850 J ? Se dă căldura specifică a apei : c apă = 4185
Răspuns:
1000 kg
Explicaţie:
Date date
t1 = 10 ° C
t2 = 293,15K = până la grad = 293,15-273 = 20,15 ° C
= 20 ° C aproximativ
Q = 418kJ = 418000J
c = 4180J / kg ° C
m =? Kg
Necesar:
Masa m în kg
Pasul doi:
Formulă:
Q = c * m * Δt
Q = c * m * (t2 -t1)
m = Q / c * (t2-t1)
Calculati:
m = 418000/4180 * (20-10)
m = 100 * 10 kg
m = 1000 kg
Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box. In this experiment, the time of an hour is a(n) _____.
A. Dependent Variable
B. Constant
C. Independent Variable
D. Control
In this experiment, the time of an hour is an independent variable, therefore the correct answer is option C
What is thermal energy?Thermal energy sometimes referred to as heat energy, may be described as the type of energy in which heat is transmitted from one body to another body as a result of their molecular motions.
As given in the problem Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box.
As stated, all three boxes were put on the window for the same amount of time—an hour—so since the time duration for the experiment was the same, it may be considered an independent variable.
Thus, In this experiment, the time of an hour is an independent variable, therefore the correct answer is option C.
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Witch one goes to witch
gas giants and ice giants
asteroids and terrestrial planets
comets and ice giants
meteoroids and asteroids
Bodies composed primarily of frozen gases
Planets composed of lighter elements compounds
bodies composed primarily of metal and rock
Rocky and metallic bodies smaller than planets
hope it helps!
when is the cats average accelerstion from 12 to 24 seconds
FIRST ONE TO GET IT RIGHT WILL GET 25 POINTS
Answer:
8
Explanation:
im gonna say 8 because the peak of the line would be at 8 not to sure 0-0
An escalator and an elevator can transport a person from one floor to the next. the escalator does it in 15 s and the elevator takes 10 s. Which does more work on the person? Which has the greater power output?
Answer:
The escalator does more work and the elevator has a greater power output.
Explanation:
The escalator does more work on the person because it is carrying them up. It also gives the person a chance to walk up the escalator making it a little more challenging than using just an elevator. The elevator has a greater power output because it can transport a person from one floor to another in just 10 seconds where as the escalator can do it in 15.
Hope this helps!
Two wires of diameter 0.25 cm, one made of steel and the other made of brass are loaded as shown in Fig. The unloaded length of steel wire is 1.5 m and that of brass wire is 1.0 m. Compute the elongations of the steel and the brass wires. Given youngs modulus of steel = 2×10 ^−11 Pa and that of brass is 0.9×10 ^−11
Pa.
Explanation:
hope this will help u
Answer:
I'll take this one also
The diagram shows a sealed container, which
represents a closed system.
How would the system change if the container were
placed on a hot plate?
O Some kinetic energy would be produced.
O Some kinetic energy would be destroyed.
O The kinetic energy of the molecules would increase.
O The kinetic energy of the molecules would decrease.
Molecules
Answer:
The kinetic energy of the molecules would increase.
Explanation:
Answer:
C. The kinetic energy of the molecules would increase.
Explanation:
On Edge 2021
A block of mass 3 kg slides along a horizontal surface that has negligible friction except for one section, as shown above. The block arrives at the rough section with a speed of 5 m/s and leaves it 0.5 s later with a speed of 3 m/s.
Complete Question
The complete question is shown on the first uploaded image
Answer:
The value is [tex]F_f = 3 * -4[/tex]
Explanation:
From the question we are told that
The mass of the block is [tex]m = 3 \ kg[/tex]
The initial speed of the block before entering the rough section is [tex]u = 5 \ m/s[/tex]
The time taken is t = 0.5 s
The speed with which the block leaves the rough section is [tex]v = 3 \ m/s[/tex]
Generally from kinematic equation
[tex]v = u + at[/tex]
=> [tex]a = \frac{v - u }{t}[/tex]
=> [tex]a = \frac{3 - 5 }{0.5}[/tex]
=> [tex]a = - 4[/tex]
Generally the magnitude of the average frictional force is mathematically represented as
[tex]F_f = m * a[/tex]
=> [tex]F_f = 3 * -4[/tex]
=> [tex]F_f = -12 \ N[/tex]
The negative sign show that the force is acting in the opposite direction to the direction of motion of the block
The frictional force between the block and the horizontal surface is 12.1 N.
The given parameters;
mass of the block, m = 3 kginitial speed of block, u = 5 m/stime of motion, t = 0.5 sfinal speed, v = 3 m/sThe acceleration of the block is calculated as follows;
[tex]a = \frac{\Delta v}{t} \\\\a = \frac{5- 3}{0.5} \\\\a = 4 \ m/s^2[/tex]
The coefficient of friction between the block and the horizontal surface is calculated as;
[tex]\mu_k = \frac{a}{g} \\\\\mu_k = \frac{4}{9.8} \\\\\mu_k = 0.41[/tex]
The frictional force between the block and the horizontal surface is calculated as follows;
[tex]F_f = \mu_k F_n\\\\F_f = \mu_k mg\\\\F_f = 0.41 \times 3 \times 9.8\\\\F_f = 12 .1 \ N[/tex]
Thus, the frictional force between the block and the horizontal surface is 12.1 N.
"Your question is not complete, it seems to be missing the following information;"
A block of mass 3 kg slides along a horizontal surface that has negligible friction except for one section, as shown above. The block arrives at the rough section with a speed of 5 m/s and leaves it 0.5 s later with a speed of 3 m/s. What is the magnitude of the average frictional force exerted on the block by the rough section of the surface?
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Earth's ________ is the pattern of slow changes in rocks from one kind to another.
a
rock cycle
b
rock
c
mineral
d
weat
Answer:
A. Rock cycle
Explanation:
Because it really is the change of a rock from another, like ingenuous, sedimentary rock..
A student is cooking macaroni and cheese for dinner. The student places a pot on the stove, boils water in the pot, places noodles in the boiling water, and watches the noodles float and sink in the pot. Explain the types of heat transfer that are occurring as the student cooks the noodles.
Answer:
Conduction.
Convection.
Radiation.
A man pushes a box along a flat, frictionless surface using a force of 500 N. The box was moved a distance of 2.5 m. The actual work done by the worker was _____
Answer:
Workdone = 1250Nm
Explanation:
Given the following data;
Force, F = 500N
Distance, d = 2.5m
Workdone is given by the formula;
[tex] Workdone = force * distance[/tex]
Substituting into the equation, we have
[tex] Workdone = 500 * 2.5 [/tex]
Workdone = 1250Nm
Therefore, the actual work done by the worker is 1250 Newton-meter.
The actual work done by the worker is 1250 J.
Work can be defined as the product of force and distance. The s.i unit of work is Joules
The formula of work is
W = Fd....................... Equation 1
Where W = work done by the worker, F = Force, d = distance.
From the question,
Given: F = 500 N, d = 2.5 m
Substitute these values into equation 1
W = 500×2.5
W = 1250 J
Hence, the actual work done by the worker is 1250 J
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Un automóvil deportivo se mueve a rapidez constante viaja 110m en 5.0s si entonces frena y llega a detenerse en 4.0s ¿Cuál es su aceleración en m/s²?
Answer:
La aceleración del automovil antes de deternerse es -5.5 m/s².
Explanation:
Podemos encontar la aceleración del auto usando la siguiente ecuación:
[tex] v_{f} = v_{0} + at [/tex]
En donde:
[tex]v_{f}[/tex]: es la velocidad final = 0 (se detiene)
[tex]v_{f}[/tex]: es la velocidad inicial
a: es la aceleración=?
t: es el tiempo = 4.0 s
Primero debemos encontrar la velocidad inicial, para ellos usaremos la siguiente ecuación de moviemiento rectilíneo uniforme:
[tex] v_{0} = \frac{x}{t} = \frac{110 m}{5.0 s} = 22 m/s [/tex]
Ahora, la aceleración es:
[tex] a = \frac{v_{f} - v_{0}}{t} = \frac{0 - 22 m/s}{4.0 s} = -5.5 m/s^{2} [/tex]
El signo negativo se debe a que el auto está desacelerando.
Entonces, la aceleración del automovil antes de deternerse es -5.5 m/s².
Espero que te sea de utilidad!
A sumo wrestler is 330 pounds. How much force does the earth exert in him? Define Mass Define Weight
Answer:
a large matters of body with no shape is mass
wavelength of the wave if its frequency is 12.0 hertz and its speed is 1.2 meters per second?
Answer:
0.1m
Explanation:
Given parameters:
Frequency = 12hz
Speed = 1.2m/s
Unknown:
Wavelength of the wave = ?
Solution:
The wavelength of the wave can be derived using the expression below;
V = f∧
V is the speed of the wave
f is the frequency of the wave
∧ is the wavelength
So;
∧ = [tex]\frac{Velocity}{frequency}[/tex]
Now, insert the parameters and solve;
∧ = [tex]\frac{1.2}{12}[/tex] = 0.1m
what is force?what are the type of force?
Answer:
There are 2 types of forces, contact forces and act at a distance force. Forces. Every day you are using forces. Force is basically push and pull. When you push and pull you are applying a force to an object.The Four Fundamental Forces of Nature
Gravity.
The weak force.
Electromagnetism.
The strong force.