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Actually Welcome to the concept of Efficiency.
Here we can see that, the Input work is given as 2.2 x 10^7 J and the efficiency is given as 22%
The efficiency is => 22% => 22/100.
so we get as,
E = W(output) /W(input)
hence, W(output) = E x W(input)
so we get as,
W(output) = (22/100) x 2.2 x 10^7
=> W(output) = 0.22 x 2.2 x 10^7 => 0.484 x 10^7
hence, W(output) = 4.84 x 10^6 J
The useful work done on the mass is 4.84 x 10^6 J
A bicycle and a tennis ball are both at the top of a hill storing potential energy. If they both start rolling down the hill at the same time, which one will have the most
kinetic energy?
Answer:
a bicycle has more kinetic energy cuz kinetic energy depends on mass and velocity.bicycle has more mass than a tennis ball.
A 3000-kg spaceship is moving away from a space station at a constant speed of 3 m/s. The astronaut in the spaceship decides to return to the space station by switching on engines that expel fuel so that the sum of the forces exerted on the spaceship by the expelled fuel points toward the space station. What is the magnitude of the minimum force needed to bring the spaceship back to the space station
Answer:
P = m (v2 - v1) change in momentum
P = - m v1 if v2 is to be zero
F = P / t change in momentum equals applied force
F = m a = - m v1 / t
a = -v1 / t or a * t = -v1`
Any combination of a and t that is greater than v1 will bring the space station to a halt
If a is small then t must be large
Any applied force will eventually bring the ship to a halt and then begin the acceleration towards the starting point
In the district soccer championship finals, Elizabeth kicks a 6 N soccer ball with a force of 80.0 N to the right.
There is friction between the ball and the ground (mu=0.20) as well as 23 N of air resistance.
(i) Draw the FBD for the ball; include both types of forces and magnitudes.
(ii) What is the net force acting on the ball? Show work
(iii) What is the acceleration of the ball? Show work
Sue and Jenny kick a soccer ball at exactly the same time. Sue’s foot exerts a force of 68.9 N to the north. Jenny’s foot exerts a force of 85.4 N to the east.
a) What is the magnitude of the resultant force on the ball?
Answer in units of N.
Explanation:
the magnitude of the resultant force =
√(68.9² + 85.4²)
=√(4,747.21 + 7,293.16)
=√12,040.37
= 109.7 N
»Sue's style feet (north) = 68.9N
»Jenny style feet (East) = 85.4N
So, the resultant force on the ball is
= √(68.9² + 85.4²)
= √(4,747.21 + 7,293.16)
= √(12,040.37)
≈ 109.72N✅
~Physics#2
A high school bus travels 240 km west in 6.0 h. What is its average velocity for the trip?
Answer:
240÷6.0 =40
Explanation:
so that is the answer
What is the density of a block of wood, that weigh 18 grams, and volume is 56ml
Answer:
0.3214 grams per millimetre
Explanation:
Answer: 32
Explanation:
D = m/v
D = 18/56
D = ?
Please help will be marked most brainlist !!!
Which of the following is not a true statement?
Answer:
d
Explanation:
all of the rest are true
Un perro de rescate parte del campamento en búsqueda de una persona extraviada. Se desplaza 3 km al Este, 2.5 km al Norte, 3.5 km al Suroeste y 2 km al Sur, siguiendo la ruta del caminante. ¿A qué distancia y en cuál dirección a partir del campamento se encontraba la persona perdida?
Answer:
2.9 ok ezzzzzzzzzzzzzzzzzzzzzzz
Which of the following statements about using knives is FALSE?
Carry knives point down.
When cutting, the knife blade should be parallel to your nails on your guiding hand.
When cutting, lay thumb and forefinger flat on the food your are cutting to hold it firmly in place.
Always cut away from the body.
Answer:
When cutting, lay the thumb and forefinger flat on the food you are cutting to hold it firmly in position
Explanation:
Because it may cut you so avoid it
11 12 13 14 15 16 17 18 19 20
TIME REMAINING
01:40:56
Who described atoms as small spheres that could not be divided into anything smaller?
Bohr
Dalton
Rutherford
Thomson
Answer:
jhon Dalton described it
Explanation:
hope it works out for you
if please mark brainiest
John Dalton described atoms as small spheres that could not be divided into anything smaller.
Who was John Dalton?John Dalton is the scientist who described atoms as small spheres that could not be divided into anything smaller. He proposed his atomic theory in 1803, which included the postulate that all matter is composed of tiny, indivisible particles called atoms. D
Dalton's theory also stated that atoms of different elements are unique in their mass and chemical properties and combine in simple whole-number ratios to form compounds. Dalton's model of the atom was a solid, indivisible sphere that was the smallest possible unit of an element.
While this model has been refined and updated with new discoveries, Dalton's contributions laid the foundation for the modern understanding of atomic structure and chemical reactions.
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what is electrostatic induction
Answer:
See Below
Explanation:
It is a change in the distribution of electric charge on one object because of the influence a nearby object that has an electric charge. So if an object with a negative charge is brought near to a neutral object, the neutral object will alter itself so that one side becomes more positive and the other side becomes more negative.
Electrostatic induction occurs whenever any object is placed in an electric field.
help i dont know vfvvfvf
Answer:
20 steps is his displacement
Choose the correct definitions of speed, velocity, and acceleration. Check all that apply. Acceleration tells us in which direction the object is going. Speed is the rate of change of velocity in time. Acceleration is the rate of change of velocity in time. Velocity is used to describe changes in the movement direction of the object. Acceleration tells us how far the object will go in a certain amount of time. Velocity is used to describe how fast the object is moving and tells us in which direction it is going. Speed is used to describe how fast the object is moving. Velocity is the rate of change of speed in time. Speed is used to describe how fast the object is moving and tells us in which direction it is going.
We have thatThe options that define Speed, Velocity,Acceleration.
Speed is used to describe how fast the object is moving.Acceleration is the rate of change of velocity in time.Velocity is used to describe how fast the object is moving and tells us in which direction it is going.Options
B,D,E
From the question we are told
Choose the correct definitions of speed, velocity, and acceleration. Check all that apply.
Acceleration tells us in which direction the object is going. Speed is the rate of change of velocity in time. Acceleration is the rate of change of velocity in time. Velocity is used to describe changes in the movement direction of the object. Acceleration tells us how far the object will go in a certain amount of time. Velocity is used to describe how fast the object is moving and tells us in which direction it is going. Speed is used to describe how fast the object is moving. Velocity is the rate of change of speed in time.Speed is used to describe how fast the object is moving and tells us in which direction it is going.
Generally
Acceleration is the rate of change of velocity in time.Velocity is used to describe how fast the object is moving and tells us in which direction it is going.Speed is used to describe how fast the object is moving without its direction in considerationHence
The options that define Speed, Velocity,Acceleration.
Speed is used to describe how fast the object is moving.Acceleration is the rate of change of velocity in time.Velocity is used to describe how fast the object is moving and tells us in which direction it is going.Options
B,D,E
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to digitize sound, a process called _____ is used to measure the amplitude of a sound wave thousands of times per second.
Answer: Sound recording and production
Explanation: Digital audio is also the name for the entire technology of sound recording and reproduction using audio signals that have been encoded in digital form.
which transition will lead to the emission of light with longer wavelength?
Answer:
(C)
Explanation:
its C ok
The transition that will lead to the emission of light with longer wavelengths is n = 3 to n = 2. The correct option is c.
What is the emission of light?The largest energy change, and hence the shortest wavelength, x nm, would occur during the transition from the highest to the lowest energy levels. When an electron moves from the n = 5 to the n = 1 level, an atom emits yellow light.
The Bohr model of the atom is named for Niels Bohr, who created a model of the electron in which electrons were arranged into energy levels using observations of atomic spectra.
Because electrons can only exist in the energy levels and not in the intermediate states, they must absorb or emit a certain amount of energy to change energy levels.
Therefore, the correct option is c. n = 3 to n = 2.
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The question is incomplete. Your most probably complete question is given below:
a. n = 1 to n = 3
b. n = 4 to n = 3
c. n = 3 to n = 2
d. n = 3 to n = 1
e. n = 2 to n = 3
what is the first invention that humans created to look at the stars?
Answer:
telescope
Explanation:
| AMNH. Before telescopes were invented, people gazed at the night sky with amazement and dreamed of a closer look. The invention of the telescope in 1608 gave humans their chance to explore the vastness of the Universe.
Answer:
The invention of the telescope
PLS MARK BRAINLIEST
hi guys can yall answer this this one is very easy
Answer:
1:physical fitness
2:cardiovascular endurance
3:self testing exercise
4:zipper test
5:fitness level
Explanation:
hope this helps
Question 14
1 pts
Time
Attem
26M
In an experiment, a student adds weights to a spring and then measures the length the
spring is pulled. The length the spring is pulled is called the
O Dependent Variable
O Controlled Variable
Independent Variable
O Random Variable
< Previous
Next >
Answer:
The answer is Dependent Variable
6. A surface receiving sound is moved from its original position to a position three times fa
received sound thus becomes
O A. three times lower
O B. nine times lower.
O C. three times higher.
O D. nine times higher.
Answer: Answer is D
Explanation:
A surface receiving sound is moved from its original position to a position three times farther away from the source of the sound. The intensity of the received sound thus becomes nine times as low.
A surface receiving sound is moved from its original position to a position three times farther away from the source of the sound. The intensity of the received sound thus becomes nine times lower . Option(B) is correct.
What is intensity of sound?The power of sound per unit area is used to define sound intensity. The measurement of sound intensity in the air is the typical context. The surface of the sound source also plays a role. The kinetic energy of the mass of air is produced by the source's and the vibrating surface's increasing amplitudes.
With the air's mass vibrating and with its average speed, this kinetic energy rises. The distance from the sound source affects how strongly the ear perceives a sound. The characteristics of the elastic medium between a sound source and the ear also affect intensity. The sounds are weakened by non-elastic materials like wool, felt, etc.
Mathematically: sound intensity = acoustic pressure/normal area to the direction of propagation.
So, when a surface receiving sound is moved from its original position to a position three times farther away from the source of the sound, its normal area becomes 9 times larger and intensity of the received sound thus becomes nine times lower .
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What is the kinetic energy of your car if it has a mass of 100kg and is driving
at a speed of 12m/s?
[tex]▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ { \huge \mathfrak{Answer}}▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ [/tex]
As we know,
[tex]\boxed{ \boxed{kinetic \: \: energy = \frac{1}{2} mv {}^{2} }}[/tex]
where,
m = mass = 100 kgv = velocity = 12 m/slet's solve for kinetic energy of car :
[tex] \dfrac{1}{2} \times 100 \times 12 \times 12[/tex][tex]100 \times 12 \times 6[/tex][tex]7200 \: \: joules[/tex]What happens to the density of a fluid as it temperature increases/decreases?
why do solar eclipses happen only during a new moon?
Answer:
For a solar eclipse to occur the moon must be between the earth and the sun (the light of the sun is blocked)'
By definition this is a new moon (which occurs when the moon cannot be seen because it is located between the sun and the earth).
will an object have the same weight on moon as it does ?
Answer:
The mass of an object is the same everywhere either on earth or moon.
The weight of an object depends on a gravitational acceleration and it's different from one on earth and that on moon.
therefore the weight changes but the mass is the same.
Explanation:
Hope this helps
In which of the following cases of motions, the distance moved and the magnitude of the displacement are equal?
If the car is moving on a straight road
If the car is moving in circular path
The pendulum is moving to and fro
The earth is moving around the sun
Answer:
answer is number (a) If the car is moving on a straight road....
Explanation:
The distance moved and magnitude of displacement are equal only in the case of motion along a straight line. Because displacement is the shortest path between initial and find path. So, for car moving on straight road, distance moved and magnitude of displacement are equal.
the kinesis of objects and figures within the frame and of the frame itself are both aspects of ________.
Which of the following is true statement about speed?
a) Speed has no magnitude and direction
b) Speed has magnitude but no direction
c) Speed has both magnitude and direction
D) speed has magnitude but no direction
B and D are both the same statement.
It's the correct one.
Henry ran a 100 m race. Use the graph to answer the following:
a. How long did it take for Henry to run 100 m?
b. What is Henry's average speed over the race?
Using the graph, which describes how Henry ran the 100m race;
a) It takes Henry 20seconds to run 100m
b) Henry's average speed over the race is; 5m/s.
According to the linear graph which describes the distance ran by Henry during the 100m race as a function of time.
a) Since the distance from start ran by Henry is plotted on the vertical axis, and the time is plotted on the horizontal axis;
To determine how long it took Henry to run 100m; The point corresponding to 100m is traced downward from the line of the graph and we find out that;
It takes Henry 20seconds to run 100m
b) Henry's average speed over the race is simply;
The slope of the distance-time graph.
Therefore,
Average speed = (100-0)/(20-0)Average speed = 100/20Average speed = 5m/s.Therefore, Henry's average speed over the race is; 5m/s.
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light waves are first transmitted through the ________ at the front of the eye and enter an opening called the ________ before shining onto the retina.
The transmission of light waves is usually done through cornea of the eyes, then move through another opening which is regarded as pupil before it will get to the retina.
Light waves can be regarded as moving energy which contains microscopic particles known as photons. The vision of the eye can be completed through the light wave passing through the components of the eyes and this process goes thus;Light will move through the (cornea) which is situated at the front area of the eyes into lens. Then both the cornea and the lens give room for the focusing of the light rays to the retina which is situated at the back of the eye .Then through the help of the cells in the retina, the light will be absorbed and then be converted to electrochemical impulses and then transfer it to the brain as well as optic nerve.Therefore, light wave are form of tiny microscopic particles.
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Chuyển đổng đều là gì
Answer:
I don't know what your asking
A ball is rolling across the floor at a constant speed. What will happen to the ball if it is exposed to an unbalanced force in the same direction that it is moving?
A. It will immediately stop.
B. Its speed will increase.
C. Its speed will decrease.
D. Its motion will be unchanged.
Answer:
B. it's speed will increase