You serve a volleyball with a mass of 2.1kg the ball leaves your hand with a speed of 30 m/s. What is the kinetic energy of the ball?
Answer:
945 joules
Explanation:
the formula for kenetic energy is:
0.5 × m × v^2
where m is in (kg) ane (v) is in meter per second.
so we can just use the formula;
0.5 × 2.1 × 30^2
so the answer is 945 joules
I REALLY NEED HELP!!!!
4. The pressure under the tyres of a tractor is 60 000 Pa. The pressed area is 0.5 m². How much
is the weight of the tractor?
Answer:
weight = 30000 Newton
Given:
pressure: 60,000 Paarea: 0.5 m²========================
[tex]\sf pressure \ (Pa)=\dfrac{force \ (N)}{area \ (m^2)}[/tex]
[tex]\dashrightarrow \sf \ 60 000 = \dfrac{force}{0.5}[/tex]
[tex]\dashrightarrow \sf \ force =60 000 *0.5[/tex]
[tex]\dashrightarrow \sf \ force =30000 \ N[/tex]
========================
Weight is the force due to gravity.
Thus, force = gravity = 30000 N
Which magnet would be best for lifting heavy metal, moving it,and letting go of it
Seat belt laws are a good idea because of which of the following law of motion?
A. Newton’s second law of motion
B. Newton’s first law of motion
C. Newton’s third law of motion
D. Murphy’s law of motion
E. None of the above
Please help
Answer:
B. Newton's first law of motion.
Explanation:
The law of inertia or the first law of motion.
Answer:
Newton's first law
Explanation:
This law states that
Every object remains in at rest or its motion unless any external force is appliedWhen car breaks sudden then we get pulled forwards so seat belt is for safety
If military strategists understand wave behavior, what impact could that have on the armed forces?
Answer:
they may find ways of solving wars without fighting
Explanation:
This is because when the military understand why the other nation is planning a war they can resolve it simply
Proper use of the friction zone makes it easier to:.
Friction is the opposition offered to the movement of a surface on another and depends on the nature of the surfaces in contact.
What is friction?The term friction refers to the opposition that is offered by surfaces in contact when they move over each other. The question is incomplete but I will try to help you the much I can.
Now recall that fricton only depends on the nature of the surfaces in contact. The friction is te reason when heat is provides in the moving parts of machines.
Learn more about friction: https://brainly.com/question/15117038
A girl kicks a soccer ball into the air. Which of these best explains why the soccer ball falls back to Earth?
a.the motion of the ball is changed by extreme forces
b.the acceleration of the ball is unstable
c.the force exerted on the ball is greater than gravity
d.the pressure on the ball changes with altitude
Answer:
a
that extreme force is gravity changing the moshon
Hello people ~
On charging by conduction, mass of a
body may
(a) increase
(b) decreases
(c) increase or decrease
(d) None of these
increase or decrease
body gains mass when gets negative charge/electronsbody losses mass when gets positive charge/losses electrons
Thus the mass may increase and decrease due to conduction || varies
When working with a conservative force, it is generally easier to work with a potential energy function, which is a scalar, than to compute the work along some path from the forces and displacements, which are vectors. the change in the potential energy of an object depends only upon its initial and final position, but it is independent of the path undertaken to move between those positions. some effort is initially required to obtain the potential energy function. consider a block of mass m attached to the end of a horizontal hooke's law spring with spring constant k. the block is free to move along a frictionless horizontal surface, and displacements are measured from the equilibrium position of the spring, taken here as the origin of the coordinate system.
a = fs = - k x iì‚
b = ds = dx iì‚
c = dw = - k x dx
d = dus = k x dx
required:
a. a finite change in the potential energy may be obtained by integrating infinitesimal changes. what integral expressions is correct for this hooke's law spring?
b. perform the integrations, and input an expression for the change in the potential energy of the spring, also known as the elastic potential energy.
a. The integral expression for the change in potential energy of the spring is ΔU = ∫kxdx
b. The change in potential energy of the spring is ΔU = k(x₂² - x₁²)/2
Since we are given the differential elastic potential energy, du, to find the integral expression, we integrate du.
a. The integral expression for the change in potential energy of the springThe integral expression for the change in potential energy of the spring is ΔU = ∫kxdx
Since the infinitesimal elastic potential energy of the spring du = kxdx, integrating both sides of the expression, we have
ΔU = ∫du
ΔU = ∫kxdx
So, the integral expression for the change in potential energy of the spring is ΔU = ∫kxdx
b. The elastic potential energy of the springThe change in potential energy of the spring is ΔU = k(x₂² - x₁²)/2
Performing the integration for the change in potential energy of the spring
ΔU, we have that integrating for change in length from x₁ to x₂
ΔU = ∫kxdx
ΔU = k[x²/2]₁²
ΔU = kx₂²/2 - kx₁²/2
ΔU = k(x₂² - x₁²)/2
So, the change in potential energy of the spring is ΔU = k(x₂² - x₁²)/2
Learn more about elastic potential energy here:
https://brainly.com/question/25996974
Practice Problems
31. Follow-up Suppose the coefficient of kinetic friction is equal to
0.120. What is the acceleration of the salt shaker in this case?
32. A baseball player slides into third base with an initial speed of
40 m/s. If the coefficient of kinetic friction between the player and the
(a) The acceleration of the salt shaker is 1.18 m/s².
(b) The distance traveled by the baseball player before coming to rest is 204.1 m.
Acceleration of the salt shakerThe acceleration of the salt shaker at the given coefficient of kinetic friction is determined as follows;
a = μg
a = 0.12 x 9.8
a = 1.18 m/s²
Acceleration of the baseball player is calculated as follows;
a = μg
a = 0.4 x 9.8
a = 3.92 m/s²
Distance traveled by the baseball playerThe distance traveled by the baseball player before coming to rest is calculated as follows;
v² = u² - 2as
0 = 40² - 2(3.92)s
0 = 1600 - 7.84s
7.84s = 1600
s = 204.1 m
The complete question is below:
A baseball player slides into third base with an initial speed of 40 m/s. If the coefficient of kinetic friction between the player and the ground is 0.40, how far does the player slide before coming to rest?
Learn more about coefficient of friction here: https://brainly.com/question/20241845
If a 2 meter diameter ball representing the Sun were placed in Center Circle in Indianapolis, how far away should the Earth be placed?
By applying the correspondent change of scale, we will see that Earth should be placed 214.8m away from the scale sun.
How far the Earth should be placed?The real radius of the Sun is:
R = 696,340 km
And the radius of the scale Sun is 1m, then we have the relation:
1m = 696,340 km
1 = (1m/696,340 km)
Now, the real distance between the Sun and Earth is:
d = 149,600,000 km
If we apply the change of scale we have above, we will get:
d = 149,600,000 km*(1m/696,340 km) = 214.8m
So the Earth should be placed at 214.8m of the ball that represents the sun.
If you want to learn more about changes of scale, you can read:
https://brainly.com/question/15891755
Compressed air moves through a pipe at a speed of 0.5m/s. If the diameter is 1 cm, what is the flow rate of the air
Answer:
Square the pipe's radius. With a radius, for instance, of 0.05 meters, 0.05 ^ 2 = 0.0025. Multiply this answer by the pressure drop across the pipe, measured in pascals. With a pressure drop, for instance, of 80,000 pascals, 0.0025 x 80,000 = 200.
Explanation:
I hope this helps!
3. How long (means time) must a 400 W electrical engine work in order to produce 300 kJ of work? (p = W/t. T = w/p)
Answer:
7.5 sec
Explanation:
400 • t = 3000
(the 300 kJ was turned into 3000 J)
divide both sides by 400
400t/400 = 3000/400 ——-> 7.5
The answer becomes 7.5 sec
I hope it helps! Have a great day!
Anygays-
please help me out !!
Space exploration costs the taxpayers of united states millions of dollars each year. However, it is the only way we will learn more information about space. Do you think the cost of space exploration is justified or should those tax dollars be spent elsewhere? Explain your answer.
The space exploration program should continue, and should receive continued generous annual funding.
The US space program has NEVER launched a capsule full of money into space. NEVER ! The money spent on the space program is paid to hundreds of thousands of employees and contractors who design, develop, build, and launch the spacecraft and the scientific equipment they carry.
These people who get the money spend it to buy homes, cars, clothes, beer and bread, and send their children to school ... exactly the same things other Americans do with the money they earn on their jobs.
Just because the most visible product of this industry gets shot into space and never comes back does NOT mean that the money to do it is also lost forever. It's taxpayer money that the government pours straight back into the nation's economy, through the hands of the workers and scientists who operate the US space program.
Which of the following is NOT a chemical change/reaction?
Question 3 options:
2 liquids are combined, and a solid precipitate is formed
phase/state change (solid, liquid, gas)
production of gas bubbles
rusting metal
Answer:
rusting metal I think hehe
If two objects collide and stick together, what must increase?
A. the acceleration due to gravity
B. the friction between the two objects
C. the force of gravity between the objects
D. the two objects' momentum
Help pls.
4. If it requires 19,208 J to lift an object in 10s, how much power is needed?
Answer:
1920.8
Explanation:
If the object is lifted straight up at constant speed, then the force needed to lift it is equal to its weight mg. The work done on the mass is then W = Fd = mgh. We define this to be the gravitational potential energy (PEg) put into (or gained by) the object-Earth system
Determino la masa en gramos y kilogramos de 1500 cm3 de alcohol etílico, cuya densidad es aproximadamente 790.0 Kg/m3. Tomar en cuenta que: Densidad (ρ) = masa (m)/volumen(v).
Para calcular el contenido en gramos de una bebida alcohólica basta con multiplicar los grados de la misma por la densidad del alcohol (0,8). El contenido de alcohol de una bebida depende de la concentración de alcohol y del volumen contenido.
The mass in grams and in kilograms of ethyl alcohol respectively is: a) 1185.0 g and b) 1185 kg
What is density?Density is an intensive property of matter. It represents the relationship between the mass and the volume of a body or substance. Its units are in the International System kg/m3, kg/L, g/ml, g/cm3, among others.
The density formula is:Density = m/V
The mass is obtained by clearing this equation
m=Density *Volume
datam= ?
V= 1500 cm3 * 1 * 10⁻⁶ m³ / 1 cm³ = 0.0015 m³ = 1.5 * 10⁻³ m₃
Density= 790.0 kg/m3
m = 790.0 kg/m³ * 1.5 * 10⁻³m³ = 1.185 Kgm = 1.185 kg * 1000 g/ 1 kg = 1185,0 gm= 1185,0 gSee more about this at:https://brainly.com/question/23704878A resistor of 4 ohms is connected isn series to a box speaker of unknown resistance.If a current of 0.6A flows through the speaker when a voltage of 12V is applied across the combination, calculate: 1. the total resistance in the circuit. ii. the resistance of the speaker ili. the voltage applied across the speaker
Answer:
the total resistance: 20 ohms
the resistance of the speaker: 16 ohms
the voltage across the speaker: 9.6V
.................................
Can someone help me, I'll give you brainliest!!! (For Dark Paradox)
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
What Daryl said is correct and the relationship among them is a causation than a correlation, because we know that high pitched sound wave has more frequency than that of low pitched sound wave. and we also know that if the medium is same then velocity of wave is same* so if there is high pitched sound wave, it has shorter wavelength and if there's low pitched sound wave it has longer wavelength. since there's an inverse relationship between wavelength and frequency.
I hope it was easy to understand, let me know if you have doubts ~
. Scientific question: Why does a dog circle its bed before lying down?
Write the steps you would take to explore this question using the scientific method.
Answer:
In the scientific method first of all is you need to identify the problem, the problem to your question is why does the dog circle its bed before lying down. Second is the observation to gather some data, you need to observe the dog if what could be the possibility the the dog may do that action. The third is the per hypothesis, you need to came up with an idea why does the dog do such and action for example the needs to find a correct spot to make itself comfortable and lastly the hypothesis, this should answer to your question or your problem. So my hypothesis is that dogs are one of the animals that are those difficult to find a place to sleep and some of that kind of animals are cat, before they lay on their bed, they have to circle to find a spot that could fit its body to be more comfortable when the dog sleep
Explanation:
Hope that helps you with your question.
26. Suppose you have a circuit with two lightbulbs that have the same resistance
connected in series and you have another circuit with two lightbulbs with the same
resistance connected in parallel. What would happen if you disconnected one bulb in
each circuit?
Answer:
It would break the circuit.
Explanation:
How are solar flares different from solar prominences.
Answer:
What is the difference between a prominence and a solar flare? A prominence is a loop of cool incandescent gas that extends above the photosphere. A solar flare is an explosive release of energy that comes from the sun and causes magnetic ditrubances.
Explanation:
acceleration can occur when a car is moving at a constant speed. what must cause this acceleration?
what is one watt power?
Answer:
1-watt power is defined as the power produced when 1 Joule of work is done for 1 second.
Explanation:
Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!
Answer:
In terms of electromagnetism, one watt is the rate at which electrical work is performed when a current of one ampere (A) flows across an electrical potential difference of one volt (V), meaning the watt is equivalent to the volt-ampere (the latter unit, however, is used for a different quantity from the real power of an electrical circuit).
Explanation:
Hope it helps :)
Pls mark brainleist <3
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Tori
What kind of particles exert electric force?
1. ….. has no definite shape or size
A. Solid
B. Liquid
C. Gas
D. Plasma
2. Distance traveled per unit of time is..
A. Velocity
B. Speed
C. Motion
D. Acceleration
3. The SI unit of pressure is the..
A. Pascal
B. Atmosphere
C. Torr
D. Bar
( please help me)
Answer:
See below ↓↓↓
Explanation:
1. C. Gas
Gases are classified as a state of matter which has no definite shape or sizeLiquids are commonly confused with gases in this manner, but remember liquids take the definite shape of the container if poured in, gases are not so2. B. Speed
As the term "distance" is given, it is definitely speedOn the other hand, if "displacement" was given, then it would be velocity3. A. Pascal
All of the options are units of pressureBut, the SI unit is actually N/m², which otherwise commonly called Pascalg Two point charges -6 C and -8 C charge are 12 cm apart. What is the magnitude of the electric field at a point half-way between the two charges
Explanation:
q1 = -6
q2 = -8
d^2 = (6/100)^2 = 0.0036
k = 1/4*(pi*E) where E js the permittivity of free space
F = (k*q1*q2)/(d^2)
Substitute your values into this equation and solve
Which famous astronomer discovered jupiter’s largest moons?.
Answer:
Galileo Galilei
Explanation:
The famous astronomer Galileo Galilei was the one who discovered Jupiter’s large moons.
I hope it helps! Have a great day!
Muffin ^^
Answer:
Galileo Galilei
Explanation:
The great and famous astronomer Galileo Galilei was the one that discovered Jupiter’s largest moons.
I hope it helps! Have a great day!
Anygays-