. Calculate the kinetic energy of a 0.25-kg toy car traveling at a
constant velocity of 2 m/s.
Answers
The kinetic energy of the toy car is 0.50 Joules.
Given the following data:
Mass of toy car = 0.25 kg Velocity = 2 m/s.
To find the kinetic energy of the toy car:
Kinetic energy is an energy that is possessed by a physical object or body due to its motion.
Mathematically, kinetic energy is calculated by using the formula;
[tex]K.E = \frac{1}{2} MV^2[/tex]
Where:
K.E is the kinetic energy. M is the mass of an object. V is the velocity of an object.Substituting the given parameters into the formula, we have;
[tex]K.E = \frac{1}{2} \times 0.25 \times 2^2\\\\K.E = \frac{1}{2} \times 0.25 \times 4\\\\K.E =0.25 \times 2[/tex]
K.E = 0.50 Joules
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Related Questions
A wheel with radius r rotates freely about its axle with initial angular speed ωi. A point on the wheel's rim moves at linear speed v.
Suddenly, the wheel accelerates so the point moves at linear speed 3v. The final angular speed is ωf.
How does the angular speed of the wheel change?
Answers
Answer:
[tex]\dfrac{2\omega_i}{t}[/tex]
Explanation:
r = Radius of wheel
v = Initial linear speed
3v = Final linear speed
Initial angular speed is given by
[tex]\omega_i=\dfrac{v}{r}[/tex]
Final angular speed after time [tex]t[/tex] is given by
[tex]\omega_f=\dfrac{3v}{r}\\\Rightarrow \omega_f=3\dfrac{v}{r}=3\omega_i[/tex]
The angular acceleration of the wheel will give us how the angular speed of the wheel changes.
From the equations of rotational motion we have
[tex]\omega_f=\omega_i+\alpha t\\\Rightarrow 3\omega_i=\omega_i+\alpha t\\\Rightarrow \alpha=\dfrac{3\omega_i-\omega_i}{t}\\\Rightarrow \alpha=\dfrac{2\omega_i}{t}[/tex]
The acceleration wheel is [tex]\dfrac{2\omega_i}{t}[/tex].
Answer:increases by a factor of 3
Explanation: just trust me bro
In which situation is no work being done?
Answers
Answer:
procrastinating
Explanation:
procrastinating is when someone dose not want to do work
Explanation:
if force is applied but object do not move then
it is situation for no work done
Which of the following would double the resistance in a wire?
a. Double the mass of the wire
b. Double the length of the wire
c. Half the mass of the wire
d. Half the length of the wire
Answers
Answer:
b. Double the length of the wire
Explanation:
I just took the test.
When we Double the length of the wire would double the resistance in a wire would double. The correct option is B.
What is resistance?Resistance is the obstruction of electrons in an electrically conducting material.
The mathematical relation for variation in resistance with length is given by
R = ρ*L/A
where r is resistance
ρ is the resistivity constant for
L is the length of the wire
A is an area of the cross-section for the wire
As evident from the above relation that resistance is directly proportional to the length of the wire keeping other parameters constant
Thus, by Doubling the length of the wire the resistance of the wire will be doubled, therefore the correct answer is B.
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A rock is dropped from a height of 3.4 m. How much time does it take to hit
the ground?
O .83 s
O 1.17 s
O 0.59 s
O 33.32 s
Answers
Explanation: gravity =9.8m/s2 which means that 3.4mx9.8m/s2=33.32s
I hope this helped ! Sorry if it’s wrong :)
A car travels for 10 seconds at 5 m/s. How much distance does it travel?
Answers
the compound sodium sulfide consists of a ratio of two sodium ions (Na^+) to one sulfide ion (s^2-). Wrote a chemical formula for this compound.
Answers
Answer:Na2S
Explanation:
Doing assignment
Between which two atoms of water are hydrogen bonds are formed?
A. between the hydrogen atom of one water molecule and the oxygen atom of another
B. between the hydrogen atoms of two water molecules
C. between the oxygen atoms of two water molecules
Answers
A skater increases her velocity from 2.0 m/sec to 10.0 m/sec in 3.0 sec. what is the acceleration of the skater
Answers
Final speed 10.0 rn/s Change in time = 3 seconds The acceleration of the skater is 2.7 meters per second Relationship per second. 3.
this is my physical science homework on chemical equations please if you can answer them in order thank you!
Answers
what are some of the uses of ultra-sound
Answers
Answer:
Ultrasound has been used in a variety of clinical settings, including obstetrics and gynecology, cardiology and cancer detection. The main advantage of ultrasound is that certain structures can be observed without using radiation. Ultrasound can also be done much faster than X-rays or other radiographic techniques
Answer:
Ultrasound can be used for various purposes like diagnosing conditions, including those in the heart, blood vessels, liver and more. Yet most commonly to monitor growth and development of a fetus. A echocardiogram is a ultrasound of the heart.
Explanation:
The United States has a_____ economy
A command
B. pure market
C. mixed market
D. central planned
Please select the best answer from the choices provided
Answers
Answer:
C
Explanation:
The United States has a mixed economy it works according to economic system that features characteristics in both capitalism and socialism it makes economy system protects some private properties and allows a level of economic freedom in the use of capital
Answer:
C. is Levi's fav letter
Explanation:
i thought that ray was ugly but NAH
Brian and Emily are testing different paper airplane designs to see which will allow a plane to travel the farthest distance. Emily folds her plane and attaches a paperclip to the front of it. After she throws the plane, it travels about fifty feet and then falls to the ground. Why does the plane eventually fall to the ground?
Halp meh pleaase
Answers
Answer:
The answer is "The gravity force is stronger than for the powers in the air".
Explanation:
Gravity is the fundamental attraction force which acts among all material. On Earth, each organ does have a weight, and decreasing force of gravity, it relative towards its weight imposed by the earth's mass. Force is measured mostly by acceleration it gives to artifacts that can drop, that's why the plane eventually falls to the ground.
The energy that is stored in
chemical composition of matter is....
a. Potential Energy
b. Elastic Enersy
c. Chemical Energy
d Mechaneal Energy
Answers
Answer:
C
Explanation:
Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place.
1. The same amount of work can be done when applying a small force over a long distance or applying a large force over a short distance, since work equals blank times blank
Answers
Answer:
work done = force × displacement
Pretty cool, the atoms that exist in your body are some of the same atoms that have existed since the beginning of the universe. You are made of star stuff. What scientist made this observation?
1) Neil Degrasse Tyson
2) Albert Einstein
3) Carl Sagan
Answers
Answer:
Your answer is option 3
Explanation:
The statement is that the atoms that exist in our body are the same number of atoms that existed at the beginning of the universe. This statement is said by Carl Sagan. Hence, option (3) is correct.
What is an atom?The atom is the smallest form of matter that can be separated without releasing particles with electrical charge. It is also the smallest material with chemical element-like properties. As a reason, the atom is the basic unit of chemistry.
The most of an atom is made up of space. The remainder consists of a cloud of electrons with negative charge orbiting a positive electrode nucleus composed of protons and neutrons. The nucleus is small and dense in comparison to electrons, the lowest charged particles in nature. Electric forces, which connect electrons to the nucleus of atoms, pull electrons to any positive charge.
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Which of the following materials is a mixture? A. water B. table salt C. seawater D.iron filings
Answers
Answer:
eu acho que ê a B
uma bela noite abençoada
Answer:
The answer is "B" table salt
Good look
Explanation:
For which optical devices does d¡ always have a negative value?
A. A and B
B. A and D
C. Band D
D. B and C
Answers
Answer:
Explanation:
A i think
Weight and mass are different because,
Answers
Answer:
Explanation:
The answer is [C]
what equation demonstrates the law of conservation of mass
Answers
Answer:sorry i am only in 6 grade but this is a explanation
Explanation:Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
Determine the gravitational energy of your 2 kg physics binder if it is sitting on the ground (height= 0
meters)
Answers
Answer:
0J
Explanation:
The gravitational potential energy of the body is 0J because the height is at 0m.
Gravitational potential energy is a form of energy which is highly dependent on the position of a body. The relative position of a body in space accounts for the amount of gravitational potential energy they posses.
A body at height 0m has no gravitational potential energy:Gravitational potential energy = mgh
m is the mass of the body
g is the acceleration due to gravity
h is the height
So, if h = 0, Gravitational potential energy will become 0.
Why does the comet have tails
Answers
Answer:
Comets leave long beautiful tails when they come close to the sun. ... But when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and microparticles (electrons and ions). These materials form a tail whose flow is affected by the sun's radiation pressure.
Explanation: I just searched it up on the internet lol.
Answer:
when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and micro particles
Explanation:
:)
What is a force ?????
Answers
Answer:
A force is a push or pull upon an object resulting from the objects interaction with another object
Which of the following is NOT a type of electromagnetic wave?
Answers
Answer:
Sound waves
Explanation:
You should let someone else answer too though because I'm not 100% sure that's the correct answer.
If the velocity of a moving object decreases from 60 m/s to 30 m/s, what happens to its momentum? (2 points) Group of answer choices It is reduced by half It doubles It stays the same It quadruples
Answers
Answer:
it is decreased by 1/2
Explanation:
The velocity of the moving object is reduced by half decreasing speed is also decreasing the momentum of a certain object.
Answer:
-1/2
Explanation:
50 POINT PHYSICS QUESTION! PLEASE HELP!
A girl, standing on a bridge, throws a stone vertically downward with an initial velocity of 12.0 m/s, into the river below. If the stone hits the water 2.50 seconds later, what is the height of the bridge above the water?
Remember to identify all your data, write the equation, and show your work.
Answers
Answer: I solved it and got 30.65 meters.
Explanation: Pic Attached. Hope this helps.
Answer:
30.65
Explanation:
becuase i read the othe part
Matching vocabulary terms
Answers
Answer:
.
Explanation:
26 = Terminal Velocity
27 = Force
34 = Momentum
33 = Laws of Conversation of Momentum (I think)
Sugar is a compound. Its formula is represented below. Use the periodic table to determine which elements are in sugar. Write the elements down.
Answers
Which arrow is the action and which arrow is the reaction?
Answers
A soccer ball was kicked off the roof of a building going
20m/s. It took 5 s for the soccer ball to hit the ground?
Find the vertical final velocity, the distance the ball
traveled horizontally, and the height the ball fell.
Answers
Answer:
Final vertical velocity = -29m/s
Horizontal distance = 100m
Height = 20.41m
Explanation:
1. The vertical final velocity can be calculated thus: vy = vyo - gt
Where;
vy = vertical velocity (m/s)
vyo = vertical initial velocity (20m/s)
g = acceleration due to gravity (9.8m/s²)
t = time (5s)
Hence, vy = vyo - gt
vy = 20 - (9.8 × 5)
vy = 20 - 49
vy = -29m/s
2. x = V0 x t
Where;
x = horizontal distance (m)
Vo = initial velocity
t = time (s)
x = 20 × 5
x = 100m
3. Maximum height = (voy)²/2g
= 20²/ 2 × 9.8
= 400/19.6
= 20.41m
whos still awake???
Answers
Meeeeeeeeeeeeeeeeeeeeeeeere
Answer:
definitely not me
Explanation:
why would I?