Answer:
Axe and a knife
A roller coaster of mass 2000 kg is rolling down a track with an
instantaneous speed of 10 m/s. The roller coaster has a force of
unknown magnitude act on it, so now it is traveling at only 6
m/s. What was the work done on it?
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.
You are skateboarding in your friend's driveway. You hit a rock and your
skateboard stops, but you go flying forward and hit the ground because of
Answer:
the rock hit the board you go flying because you board stops but you have energy still going so there for you go flying
Explanation:
Answer: You are correct the reasoning is inertia.
Explain: Inertia is the ability to resist change in movement. But that is irrelevant to this question. Newtons first law, “An object in motion stayes in motion unless stopped by an outside force. This case, the outside force is the ground.
WILL MARK BRAINLIEST not like anyone answers these.. but i need the RIGHTT ANSWERR people say its A or its D idkk???? u guys confuse me but hereee
The microwave oven was invented in 1945 when some experiments with radar equipment failed and melted some nearby chocolate instead. The scientists realized there were other applications for this energy source. What is this an example of?
A) Creative thinking
B) Scientific method
C) Scientific law
D) Artistic ability
Answer:
B)
Explanation:
Scientific method- a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.
in this, the scientist had to test their theories to find a solution to their problem.
A crate is being pushed at a constant velocity. What force are being used?
Answer:
Constant Speed
Explanation:
Answer:
Friction, inertia and constant speed
Explanation:
The friction and inertia create an equilibrium
What is the difference between zone coverage and man coverage, and how can the offense team read those coverages?
Answer:
zone coverage is about sensing what the offense is attempting to accomplish against the defense. Each defensive player reacts when the ball is in the air, whereas in man-to-man coverage, he simply plays the receiver.
Explanation:
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will mark brainliest
What similarities and differences can you observe about the motion of the Earth and the motion of the Moon?
Answer:
Both the earth and the moon go through rotation.
Explanation:
The earth rotates when going around the sun and the moon rotates when circling the earth
The suns in the binary star system would be very far away, how does this
impact the size they would be in the sky?
How are a concave lens and a convex lens alike? How are they different?
ANSWER
A convex lens acts a lot like a concave mirror. ... A concave lens acts a lot like a convex mirror. Both diverge parallel rays away from a focal point, have negative focal lengths, and form only virtual, smaller images.
PLEASE HELP ME!!
If the refractive index of water is 1.33, then its critical angle is...
1) what is viscosity?
Which formula equation shows a reversible reaction?
Answer:
If this is your question... the answer is C.
Explanation:
For edge:)
Answer:
C on edge2021
PLEASE HELP!!!!
One cereal bar has a mass of 37g. what is the mass of 6 cereal bars? is that more than or less than 1kg. explain your answer
Answer:
6 cereal bars = 222g, which is much less than 1kg
Explanation:
How does the period affects the centripetal force?
what is the dimension of permeance
Answer:
metric dimensions, i think
Explanation:
What is the kinetic energy of a 72.2kg cheetah moving at a velocity of 25.9m/s?
Answer:
K = 24222.94 J
Explanation:
Given that,
Mass of a cheetah, m = 72.2 kg
Velocity of cheetah, v = 25.9 m/s
We need to find the kinetic energy of the cheetah. Due to the motion of an object, it will have kinetic energy which is given by :
[tex]K=\dfrac{1}{2}mv^2\\\\=\dfrac{1}{2}\times 72.22\times (25.9)^2\\\\=24222.94\ J[/tex]
So, the kinetic energy of the cheetah is 24222.94 J.
3 A ball is thrown haizonatally
oft a 7m building at omis
A man wants to catch the
ball in a basket 1sm of the
ground How ker away from the
building should he stand with
the basket
?
Answer:
Explanation:
very far look this up in the search the answer is there
A politician running for office tells a crowd at a rally that the only way to keep the food chain safe is to stop allowing the growth of genetically-modified crops, or GMOs. Should the politician's statement be considered a scientific fact?
A.
Yes. Public speakers are known to be experts in every subject.
B.
No. He presented no scientific data to support his claim.
C.
No. Only scientists can talk about scientific facts.
D.
Yes. He is probably friends with scientists who work with GMOs.
Answer:
B. No. He presented no scientific data to support his claim.
Which of the following is a force or motion that
is involved in the Moon orbiting Earth?
A. a force pulling the Moon toward the
center
B. a speed at right angles to the line from
the mass of the Moon to the center of
Earth
C. acceleration toward the center of Earth
D. all of the above
Answer: this answer is D. That's what I think it is
Explanation:
What is the focal length of a lens
Answer:
The focal length of a lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters.
this is refering to a camera lens, not glasses and what not, glasses do not have a focus length, only equipment that has the ability to focus
Explanation:
May I have brainliest please? :)
Help me which one dose it go ?:)
Answer:
3. sportsmanship
4. neither A nor B
The speed of a car will increase if the car’s
Answer:
moving at a fast pace
Explanation:
hi im learning about zodiac sign can u share urs and what are some things u like to do im a aquarius i play vollyball and sing tysm≅
Answer:
Im a capricorn ! UwU
Explanation:
And well I like to watch my shows
draw / do art
Listen to music
spend time with people I care about
And secretly sing ;>
Hope I could help . :3
Hope u have a amazing rest of your day / night ! <3
Sleepy~
If a golf ball is dropped from the thirteenth floor of a building, ignoring air resistance, after falling for 7.00 seconds the speed of the ball will be?
Explanation:
We know that
V = U + at
Here, u is 0 and a is 9.8 which is acceleration due to gravity.
Thus,
V = 9.8 *7
V = 68.6 m/s
Match the term with each description:
1. Acid
2. Alkaline
3. pH
4. Ion
Answer choices:
A.) An atom or molecule that has a positive or negative charge
B.) A value from 0 to 14 that is used to specify how acidic or basic a compound is when it is
C.) A compound that increases the hydroxide ions (OH-) when it is dissolved in a solution
D.) A compound that increases hydrogen ions (H+) when it is dissolved in a solution
Answer:
An acid is a compound that increases hydrogen ions (H+) when it is dissolved in a solution.
all I got
when carbon and oxygen combine chemically, what is true about the mass of the product
Answer: Equal to the mass of the carbon plus the mass of the oxygen
Explanation:
What is the distance that an airplane traveling at 600 mph, moves during the time it takes to scan the instruments?, (Time is about 0.5 seconds, 5,280 ft/mi)
Answer:
d = 134.11 m
Explanation:
Speed of an airplane, = 600 mph
We need to find the distance moved in 0.5 s (to scan the instruments).
1 mph = 0.44704 m/s
It means,
600 mph = 268.22 m/s
Speed = distance/time
Distance, d = v t
d = 268.22 m/s × 0.5 s
d = 134.11 m
So, the distance moved by airplane is 134.11 m.
A 120-kg roller coaster cart is being tested on a new track, and a crash-test dummy is loaded into it. The roller coaster starts from rest at point A which is 25 m above point B. In your own words, what physics ideas would you be able to use to predict how fast the cart is moving at point B? What calculations would you use, what things would you be measuring, and what physics principles or laws would you use to make this calculation
Answer:
vb = 22.13 m/s
So, the only thing that was measured here was the height of point A relative to point B. And the Law of Conservation of Energy was used.
Explanation:
In order to find the speed of roller coaster at Point B, we will use the law of conservation of Energy. In this situation, the law of conservation of energy states that:
K.E at A + P.E at A = K.E at B + P.E at B
(1/2)mvₐ² + mghₐ = (1/2)m(vb)² + mg(hb)
(1/2)vₙ² + ghₐ = (1/2)(vb)² + g(hb)
where,
vₙ = velocity of roller coaster at point a = 0 m/s
hₙ = height of roller coaster at point a = 25 m
g = 9.8 m/s²
vb = velocity of roller coaster at point B = ?
hb = Height of Point B = 0 m (since, point is the reference point)
Therefore,
(1/2)(0 m/s)² + (9.8 m/s²)(25 m) = (1/2)(vb)² + (9.8 m/s²)(0 m)
245 m²/s² * 2 = vb²
vb = √(490 m²/s²)
vb = 22.13 m/s
So, the only thing that was measured here was the height of point A relative to point B. And the Law of Conservation of Energy was used.
answerb this please asap
the second one
Explanation:
it isn't really a product tho its a byproduct
When learning a new exercise what is the first thing you should focus on?
A
how much weight you can lift
B
if your form is correct
Dc
how many sets you can complete
D
if you can get done first
Answer:
If your form is correct (b)
Answer:
The answer is B if your form is correct
Object X travels across a horizontal surface and collides with object Y. The velocity as a function of time for object X and object Y before, during, and after the
collision is shown in the graph. Both objects have a mass of 2 kg. Which of the following correctly describes the momentum p of the system and the kinetic
energy K of the system?
Answer:
The correct option is;
(B) [tex]\underset{P}{\rightarrow}[/tex] is conserved, K Not conserved
Explanation:
From the diagram related to the question and from the question, we have;
m₁ = m₂ = 2 kg
v₁ = 4 m/s, v₂ = -2 m/s, v₃ = 1 m/s, therefore, we have;
The total initial momentum of the system = m₁ × v₁ + m₂ × v₂
m₁ (v₁ + v₂) = 2×(4 - 2) = 4 kg·m/s
The total final momentum of the system = m₁ × v₃ + m₂ × v₃ = 2 ×1 +2 ×1 = 4 kg·m/s
Given that the total initial momentum = The total final momentum, we have that the momentum, p, is conserved
The kinetic energy of the system before collision = 1/2×m₁×v₁² + 1/2×m₂×v₂²
∴ The kinetic energy of the system before collision = 1/2*2*(4)² + 1/2*2*(-2)² = 20 J
∴ The kinetic energy of the system after collision = 1/2×m₁×v₃² + 1/2×m₂×v₃²
1/2*2*(1)² + 1/2*2*(1)² = 2 J
The kinetic energy of the system before collision ≠ The kinetic energy of the system after collision
Therefore, the kinetic energy of the system is not conserved.
If the velocities of object X and object Y after collision is the same (inelastic collision), then only momentum is conserved but if the velocities of both objects after collision are different (elastic collision), then both momentum and kinetic energy are conserved.
According to principle of conservation of linear momentum, the total momentum before and after collision is conserved.
For inelastic collision, only momentum is conserved while kinetic energy is not conserved.
[tex]m_1u_1 \ + \ m_2u_2 = v(m_1 + m_2)[/tex]
[tex]\frac{1}{2} m_1u_1^2 \ + \frac{1}{2} m_2u_2^2 = \frac{1}{2}v^2(m_1+m_2)[/tex]
For elastic collision, both momentum and kinetic energy are conserved;
[tex]m_1u_1 \ + \ m_2u_2 =m_1v_1 \ + \ m_2v_2[/tex]
[tex]\frac{1}{2} m_1u_1^2 \ + \frac{1}{2} m_2u_2^2 = \frac{1}{2}m_1v_1^2 \ +\ \frac{1}{2}m_2v_2^2[/tex]
Thus, we can conclude that, if the velocities of object X and object Y after collision is the same (inelastic collision), then only momentum is conserved but if the velocities of both objects after collision are different (elastic collision), then both momentum and kinetic energy are conserved.
Learn more here:https://brainly.com/question/24424291