Answer:
Revise energy transfers and use sankey diagrams to calculate the efficiency of these conversions with BBC ... Efficiency is a measure of how much useful energy is converted. Part of ... This is the Sankey diagram for a typical filament lamp: 100 joules of electrical energy is converted to 10 joules of light energy and 90 joules.
Explanation:
Which component of a loudspeaker produces sound waves? a solenoid coil a thin membrane a permanent magnet
Answer: A thin membrane.
Explanation:
When a sound signal is allowed to pass through the voice coil suspended between permanent magnet, magnetic field will be induced which will cause vibration in the diaphragm - a thin membrane causing disturbance of air in the surrounding of membranes which eventually produce sound waves.
Therefore, we can conclude that a thin membrane of the loud speaker produces sound waves
Answer:A thin membrane.
Explanation:
What is the net displacement of the particle between 0 seconds and 80 seconds?
Velocity (m/s)
chhi NSON WAO
20
40
80
280
100
Кузорил
Time (s)
OA.
160 meters
OB.
80 meters
OC.
40 meters
OD.
20 meters
OE.
0 meters
Answer: 80
Explanation:
The question is incomplete, There is no specific time for the specific velocity, which is not provided in this question instead of giving the total time interval from 0sec to 80 sec. According to my assumption, I think the net displacement will be 20 m. The correct answer will be option D.
What is net displacement?Net displacement is the total change in the position of an object, taking into account both the magnitude and direction of its motion. It is a vector quantity and is expressed in terms of distance and direction.
In other words, it is the final position of an object relative to its initial position, irrespective of the path taken. It is calculated by finding the vector difference between the final and initial positions of the object.
For example, if an object moves 10 meters to the east and then 5 meters to the north of its starting position, then its net displacement would be the vector sum of these two displacements, which is the diagonal distance between its starting and final positions.
Here in the Question,
To calculate the net displacement of the particle between 0 seconds and 80 seconds based on the given options, we can use the fact that the net displacement is the same as the final position minus the initial position.
Let's assume that the initial position is zero.
Option A. If the net displacement is 160 meters, the final position would be 160 meters. However, looking at the velocities given, we can see that the particle goes back and forth, so it does not make sense for the net displacement to be larger than the maximum displacement in one direction.
Option B. If the net displacement is 80 meters, the final position would be 80 meters. This option could be possible if the particle moves in one direction for a while and then moves back to its initial position. This is incorrect.
Option C. If the net displacement is 40 meters, the final position would be 40 meters. This option is also possible if the particle moves in one direction for a shorter period of time. This is not relevant to the question.
Option D. If the net displacement is 20 meters, the final position would be 20 meters. This option could be possible if the particle moves in one direction for a very short period of time. This is most relevant to the Question.
Option E. If the net displacement is 0 meters, the final position would be the same as the initial position, which is zero. This option could be possible if the particle moves back and forth such that the positive displacements cancel out the negative displacements.
Therefore, based on the given options, the correct answer for the net displacement of the particle between 0 seconds and 80 seconds is option D: 20 meters.
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When light passes from a slower medium into a faster medium, which of the following explains what will occur?
A. Light will not be refracted.
B. Light will be refracted toward a line drawn perpendicular to the point of refraction.
C. Light will be refracted away from a line drawn perpendicular to the point of refraction.
Answer:
C
Explanation:
Answer:
anser is c i just took test
Explanation:
What happens to a magnetic field if the current carrying wire A has three times as many loops but the same current as the current carrying wire B? A. Wire A will have a lower magnetic field than wire B. B. Wire A will have a magnetic field one–half as strong as wire B. C. Wire A will have a magnetic field that's greater than wire B. D. Wire A and wire B will both have the same magnetic field.
Answer: C.
Wire A will have a magnetic field that's greater than wire B.
Explanation: A current carrying wire conductor produces magnetic field around the wire as the wire turns and makes a loop.
if the current carrying wire A has three times as many loops as the current carrying wire B as they both carry the same current, then, Wire A will have a magnetic field that's greater than wire B.
Why are objects that fall near Earth's surface rarely in free fall?
O Gravity does not act on objects near Earth's surface.
Air exerts forces on falling objects near Earth's surface.
The objects do not reach terminal velocity
O The objects can be pushed upward by gravity.
Answer: Air exerts forces on falling objects near Earth's surface.
Explanation: Objects falling near the earth surface are rarely in free fall due to the force exerted by air on falling object near the earth( air resistance).
The acceleration of free fall tend to pull the body towards the earth surface while air resistance (drag) tends to act in the opposite direction.
Given that the weight of the body is always constant.
The drag acts in the upward direction, thereby negating the downward weight of the object.
From Newton's Second law:
Force = mass × acceleration due to gravity
Acceleration = force / mass
The net force acting on the object becomes :
(Downward weight - upward drag)
This hampers the free fall of the object due to gravity.
You are standing outside during the daytime. How can you see a blade of grass?
A. Light is produced by your eyes and travels out to the grass.
B. Light is produced by the grass and travels straight to your eyes.
C. Light travels from the Sun to the grass and is then reflected to your eyes.
D. Light travels from the Sun to the grass and then bounces off the sky to your eyes.
Answer:
C: Light travels from the Sun to the grass and is then reflected to your eyes.
Explanation:
Our eyes don't produce light but detect light (so answer A is not correct)
The grass doesn't produce light unless it is burning (discard answer B)
Answer C is the correct one.
The light we detect from the grass is not light bounced off the sky, it comes directly from the grass to your eyes (you are not looking at the sky when you see the grass) Discard answer D
The woman was standing on a cliff 30 meters above where she landed. There was a safety fence 4 meters from the cliff edge that would have prevented her from taking a long distance to run and leap off the cliff. She landed 12 meters away from the base of the cliff. Her launch speed was calculated to be 4.86 m/s, meaning that to travel those 12 meters, she had to be traveling at 10.87 miles per hour (or moving faster than a runner at a 5.5 minute mile pace) as she left the cliff. Put all this information together. Why did forensic scientists determine that the woman’s body was thrown instead of concluding that she jumped off the cliff?
Answer:
Forensic scientists determined that the woman’s body was thrown off the cliff because after considering the velocity and angle of the projectile needed in relationship to the cliff she could not have reached those speeds and cleared the safety fence 4m away from the cliff’s edge. She would have been going faster than a 5.5 minute mile pace and she was not an athletic person.
** Just make sure to change the format and/or wording. Hope I was helpful :-)
The woman’s body was thrown instead of concluding that she jumped off the cliff as there has more initial speed than regular which is provided during throw.
What is projectile motion?When a particle is hurled obliquely near the surface of the earth, it travels along a curved path while accelerating continuously in the direction of the planet's center (we assume the particle stays close to the surface of the globe). Such a particle's motion is known as projectile motion, and its route is referred to as a projectile.
Given: She landed 12 meters from the cliff's base.
And when she jumped off the cliff, her estimated launch speed was 10.87 miles per hour. She could have avoided having to go a considerable distance in order to jump over the cliff by using the safety barrier that was 4 meters away.
Hence, Instead of drawing the conclusion that the woman leaped from the cliff, the body of the woman was flung since throwing provides more initial speed than usual.
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A boat moves 60 kilometers east from point A to point B. There, it reverses direction and travels another 45 kilometers toward point A. What are
the total distance and total displacement of the boat?
OA. The total distance is 105 kilometers and the total displacement is 45 kilometers east.
OB. The total distance is 60 kilometers and the total displacement is 60 kilometers east.
OC. The total distance is 105 kilometers and the total displacement is 15 kilometers east.
OD. The total distance is 60 kilometers and the total displacement is 45 kilometers east.
Answer:1) the total distance is the sum of the two distances
60 km + 45 km = 105 km
2) The displacement is the net movement, or the difference between the initial position and the final position
Call x the initial position, then the final position is x + [60km - 45km]
And the displacement is x + (60km - 45km) - x =60km -45 km = 15 km
Explanation:
the planet express is in a circular orbit around the earth and has a total mechanical energy of -4.6 x 10^10 j. how much work must be provided by the planet expresss rockets in order to completley escape earth
Answer: total mechanical energy of -4.6 x 10^10 j.
Explanation: the planet express is in a circular orbit around the earth and has a total mechanical energy of -4.6 x 10^10 j.
The total mechanical energy is the sum of potential energy and the kinetic energy.
For the rocket to experience the escape from earth, the total work done will be equal to maximum kinetic energy.
According to conservative of energy, maximum kinetic energy is equal to the total mechanical energy.
The work must be provided by the planet expresss rockets in order to completley escape earth will be equal to total mechanical energy of -4.6 x 10^10 j.
A hover craft also known as a air cushion vehicle glides on a cushion of air allowing it to travel with equal is land or water. The first commercial hovercraft to cross the English channel the V. A-3 had a average speed of 26.7 M/S. Its momentum at the speed was 4.8×10^4 KGM/S. What was the mass of the V. A-3?
Answer: M = 1797.75 kg
Explanation:
given parameters are;
speed V = 26.7 M/S.
momentum P = 4.8×10^4 KGM/S.
What was the mass of the V. A-3?
Momentum P is the product of mass and velocity. That is, P = MV
Substitute V and P into the formula
4.8×10^4 = 26.7 × M
Make M the subject of formula
M = 4.8×10^4/ 26.7
M = 1797.75 kg
Therefore, the mass of the V. A-3 was 1797.75 kg
A disease common among hat makers in the seventeenth century was caused by their direct contact with
When a forklift raises an object, is it doing positive or negative work on the object? Which type of work is the force of gravity doing on the object? a)The forklift is doing negative work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing positive work on the object because it is acting opposite to the direction of motion. b)The forklift is doing positive work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing negative work on the object because it is acting opposite to the direction of motion. c)The forklift is doing positive work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing positive work on the object because it is acting opposite to the direction of motion. d)The forklift is doing negative work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing negative work on the object because it is acting opposite to the direction of motion.
Answer: B
The forklift is doing positive work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing negative work on the object because it is acting opposite to the direction of motion.
Explanation: The work done in lifting an object up is positive when the direction of the displacement and the force applied are in the same direction.
The work will be negative if force and direction of the motion are opposite to each other.
Also, force of gravity is considered positive when an object is moving toward the gravity. That is coming downward. Otherwise, it's negative when it's moving in the opposite direction.
When a forklift raises an object, the forklift is doing positive work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing negative work on the object because it is acting opposite to the direction of motion.
The forklift is doing positive work on the object because the direction of
force and the direction of motion are the same. The force of gravity is
doing negative work on the object because it is acting opposite to the
direction of motion.
When a forklift is used to raise an object , it exerts a force which acts in the
same direction with its motion which signifies that it is doing a positive
work.
The force of gravity on the other hand is doing a negative work as it acts
opposite to the direction of the force and motion.
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The shape of a lens affects the _____. A. direction light is bent B. color of light moving through it C. medium in which the light travels D. speed of light traveling through it
Answer:
A.The direction in which light is bent
Explanation:
That why I the topic thin lenses we learn how to draw Ray's of light
Answer:
a
Explanation:
Measure the width of a sheet of a standard-sized (8.5in x 11.0in) loose-leaf notebook paper. Make the measurement in centimeters and Express the answer with the correct number of significant figures.
Answer: width = 27.94 cm
Explanation:
Given a sheet of a standard-sized (8.5in x 11.0in) loose-leaf notebook paper.
From the value given, the width is 11.0 inches
To make the measurement in centimeters, we will convert inches into centimeters.
1 inche = 2.54 centimeters
That is, 11 × 2.54 centimeters = 27.94 cm.
Therefore, the width is 27.94 cm.
i have four questions.
: Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls to the ground. Think about the amounts of potential and kinetic energy the bowling ball has:
• as it sits on top of a building that is 40 meters tall.
• as it is half way through a fall off a building that is 40 meters tall and travelling 19.8 meters per second.
• as it is just about to hit the ground from a fall off a building that is 40 meters tall and travelling 28 meters per second.
Number 1. What is the potential energy of the bowling ball as it sits on top of the building?
Number 2. What is the potential energy of the bowling ball half way through the fall?
Number 3. What is the kinetic energy of the ball half way through the fall?
Number 4. What is the kinetic energy of the ball just before it hits the ground?
Answer:
The potential energy of the ball is 784 joules. And the kinetic energy of it is 392 while falling halfway down.
Explanation:
PE = mass (2kg) * Gravitational acceleration (9.8 m/s^2)* height (40 meters)
KE = 1/2 mass (1 kg) * velocity^2 (19.8)
Answer:
784 Jules, 392 Jules, 784 Jules
Explanation:
The energy a wave carries is measured by its ____. Question 15 options: wavelength frequency amplitude speed
Answer: frequency is the answer to this question
Answer:
frequency
Explanation:
c a n v a s / a p e x :))
PLS HELP!
Raymond Cattell created the 16PF self-inventory assessment by first taking 4,504 personality traits and removing all of the __________.
A. nouns
B.homonyms
C.synonyms
D.antonyms
Raymond Cattell created the 16PF self-inventory assessment by taking 4,504 personality traits and removing all of the synonyms.
What is Synonym?This is defined as a word or phrase which has a close or near meaning to the other.
Raymond Cattell created the 16PF self-inventory assessment by removing the synonyms from the personality traits.
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which of the following are good conductors under normal conditions? A. Penny B.copper wire C. a dime D.plastic E.aluminum foil F.water
Answer:
see explanation
Explanation:
A,B,C,E
B.
Because its copper
Unlike mechanical waves, electromagnetic waves can travel through a .....such as you would in space
Answer: vacuum without a material medium for its propagation
Explanation:
Unlike mechanical waves, electromagnetic waves can travel through a vacuum without a material medium for its propagation such as you would in space
Mechanical waves need a medium for its propagation when travelling through a vacuum while electromagnetic wave does not need a material medium for its propagation when travelling through a vacuum.
An object moving with uniform acceleration has a velocity of 11.5 cm/s in the positive x-direction when its x-coordinate is 3.11 cm. If its x-coordinate 1.90 s later is −5.00 cm, what is its acceleration
Answer 4005
Explanation:
32. For each of the listed parts of a power plant, make a selection to indicate in what
type(s) of power station the part is found. Place your answer in in the blank space!
I. part of a coal-fired power plant
II. part of a nuclear power plant
III. part of a coal-fired power plant and part of a nuclear power plant
a. boiler. ( insert answer)
b. combustion chamber(
c. condenser(
d. control rod(
generator(
f. turbine(
From a to f choice which of the following from I, II, III is appropriate from a to F
Answer: a. boiler - I. part of a coal-fired power plant.
b. combustion chamber - I. part of a coal-fired power plant.
c. condenser - III. part of a coal-fired power plant and part of a nuclear power plant.
d. control rod - I. part of a coal-fired power plant.
e. generator- III. part of a coal-fired power plant and part of a nuclear power plant.
f. turbine - III. part of a coal-fired power plant and part of a nuclear power plant.
Explanation:
a. Boiler: It is used in the coal power plant to heat the water used for producing electricity. The boiler keeps the temperature of water or steam at a desired level.
b. Combustion chamber: It is used for combustion of coal and using thermal energy for electricity generation.
c. Condenser; It is used in both nuclear and coal power plants. It condense and receive from the turbine.
d. Control rod: It is used in the nuclear power plant for controlling the nuclear fission and fusion reactions of heavy metals.
e. Generator: It converts the thermal energy into electrical energy.
f. Turbine: The turbine blades move with the effect of steam or any form of energy and the energy so produce is used for generating electricity in generator.
In a weak acid solution, _____.
A.) all ions in the acid compound form water
B.) many ions in the acid compound form a base
C.) no ions separate from the acid compound
D.) few ions separate from the acid compound
Answer:
A)
Explanation:
I WILL CHOOSE YOU AS BRAINLIEST , PLEASEE HELP ME IT URGENT!!!!!!!!!!!!
Relate acceleration qualitatively to a change in speed and/or direction as a result of a net force
Answer:
Over Here
Explanation:
Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
A lemming running 3.22 m/s runs off a horizontal cliff. It lands in the water 7.54 m from the base of the cliff. How much time was it in the air? (Unit = s)
Answer: 2.34s
Explanation:
Given the following :
Horizontal Velocity(V) = 3.22m/s
Horizontal Distance = 7.54m
Therefore, the time spent in the air can be calculated thus:
Using the relation:
Speed = distance / time
3.22m/s = 7.54m / time
Time = 7.54m / 3.22m/s
Time = 2.34s
If wavelength is kept constant, which increases as the speed of a wave increases? Question 13 options: period frequency amplitude phase
Answer: frequency is the answer to this question
Reduce contrast
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Key Stage 3 Science - Physics
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Question 37 of 45
A wave has a wavelength of 10 m and a speed of 65 m/s. What is the frequency of this wave in Hz?
Hz
Enter your answer as a number
CA
9
O
Answer: frequency = 6.5 Hz
Explanation:
Given that the
Speed V = 65 m/s
Wavelength (λ) = 10m
Wave speed is the product of frequency and wavelength. That is,
V = fλ
Substitute V and (λ) into the formula to get frequency f
65 = 10f
Make f the subject of formula
f = 65/10
f = 6.5 Hz
Therefore, the frequency of this wave is 6.5 Hz?
How much momentum will a dumbbell of mass 10kg transfer to the floor if it falls from a height of 80cm (assume that the dumbbell stops after hitting the ground) ? Take g=10m/s^2
(Point stealers will be reported so better dont do it)
Answer: momentum = 40kgm/s
Explanation:
Given that the
Mass M = 10kg
Height H = 80 cm = 0.8m
g = 10m/s^2
The velocity of the dumbbell as it fall can be calculated by using the formula;
V^2 = U^2 + 2gH
Since the dumbbell fell from rest, initial velocity U = 0
Substitute g and H to get final velocity V
V^2 = 0 + 2 × 10 × 0.8
V^2 = 16
V = sqrt(16)
V = 4 m/s
Momentum is the product of mass and velocity. That is,
Momentum = MV
Substitute mass M and V into the formula
Momentum = 10 × 4 = 40kgm/s
Therefore, 40 kgm/s momentum will be transferred as the dumbbell fall to the floor.
frictional force acting on a 0.5 kg object and a floor is 3 N. What is the coefficient of friction between the object and the floor?
Answer:
μ = 0.6
Explanation:
F = μN
N = mg
F = μmg
3 N = μ*0.5 kg * 9.8 m/s²
μ = 3/(0.5*9.8) = 0.6
A 14 kilogram beam is hinged at one end. A 6.0-kilogram triangular object and a 7.5-kilogram capital I-shaped object are placed as shown in the figure. The dots indicate the individual centers of gravity of the beam and objects. The center of mass of the entire system must be:
Answer: 1.3 m
Explanation:
From the figure attached, 3 materials are involved. A 14 kilogram beam hinged at one end, a 6.0-kilogram triangular object and a 7.5-kilogram capital I-shaped object.
Let take the moment at the hinge axis.
The moment for the beam will be
14 × ( 0.36 + 0.53 ) = 12.6
The moment of the triangle object will be 6 × 0.36 = 2.16
The moment of capital I shape will be
7.5 × ( 0.36 + 0.53 + 1.92 ) = 21.075
The total moment = 12.6 + 2.16 + 21.075
The total moment = 35.835
The total mass = 14 + 6 + 7.5 = 27.5
The center of mass of the entire system must be:
X = total moment ÷ total mass
Substitute both in the formula
X = 35.835/27.5
X = 1.3 m.
Therefore, The center of mass of the entire system must be 1.3m
Write down four reasons why plastic is put around electrical wires?
Plz help me
Answer:
1) is to prevent accidental contact with other conductors of electricity
2) to prevent getting shocked
3) Plastic helps dissipate the heat as well as prevent the wire from getting too hot and causing fire.
4) Without plastic, hot and neutral wires cannot be run in the same conductor or same wire
Explanation:
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ANSWER:
Reasons of using plastic around electrical wires are:
•To protect people from electric shock.
•To prevent the accidental contact of metallic partof wire with other conductor of electricity.
•To prevent the wire from getting too hot and causing fire.
•To conduct the electric flow of current properly .