Answers
Answer:
True
Explanation:
When there is no external force acting on a body there isn't change in the linear momentum. In the same way, when there is no torque acting on a body, there isn't a change in the angular momentum. Therefore, the answer is True.
When there is no torque acting on a body, its angular momentum is constant.
Related Questions
A light ray travelling from diamond into air has an angle of refraction of 56. A piece of glass is then placed right next to the diamond. Explain how the angle of refraction will change now that the light is moving from diamond into glass instead of air
Answers
The angle of refraction of a light ray travelling from diamond into air has an angle of refraction of 56 will decrease now that the light is moving from diamond into glass instead of air.
When a light ray travels from rarer medium to a denser medium, the refracted ray tends to move towards the normal. So angle of refraction < angle of incidence. When a light ray travels from denser medium to a rarer medium, the refracted ray tends to move away from the normal. So angle of refraction > angle of incidence.
Glass is denser than air. So the angle of refraction will be higher for air than the angle of refraction of glass. So, when the medium is changed from air to glass, the angle of refraction will decrease.
Therefore, the angle of refraction of a light ray travelling from diamond into air has an angle of refraction of 56 will decrease now that the light is moving from diamond into glass instead of air.
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A 3.00 kg mass is traveling at an initial speed of 25.0 m/s. What is the magnitude of the force required to bring the mass to rest in a distance of 62.5 m?
Answers
Answer:
Answer is 7.50 N
Explanation:
A race car accelerates from rest to a velocity of +90 m/s over a distance of 423m. Determine the acceleration of the race car.
Answers
Answer:
9.57m/s²
Explanation:
Given parameters:
Initial velocity = 0m/s
Final velocity = 90m/s
Distance = 423m
Unknown:
Acceleration of the race car = ?
Solution:
To solve this problem, we should apply one of the appropriate motion equations;
V² = U² + 2as
Where V is the final velocity
U is the initial velocity
a is the acceleration
s is the distance
90² = 0² + 2 x a x 423
8100 = 846a
a = 9.57m/s²
Look at the picture below and identify the atmospheric pressure found within the valley:
please help it is due in 10 min
Answers
9. When air or water is cools it...
A.) Sinks
B.) Becomes less dense
Answers
Answer:
when air or water cools it sinks
Electric resistance in copper wire changes with the temperature of the wire. If C(t) is the electric resistance at temperature t, in degrees Fahrenheit, then the resistance ratio C(t)/C(0) can be measured. Temperature t c (t) ? ratio in degrees C(0) 0 10 1.0393 20 1.0798 30 1.1215 40 1.1644 (a) Use regression to find a quadratic formula for the ratio C(t)/C(O) as a function of temperature t. Do not round the regression parameters. c(t) - CO) (b) At what temperature is the electric resistance double that at o degrees? (Round your answer to two decimal places.) t= (c) Suppose that you have designed a household appliance to be used at room temperature (71 degrees) and you need to have the wire resistance inside the appliance accurate to plus or minus 10% of the predicted resistance at 71 degrees. (i) What resistance ratio do you predict at 71 degrees? (Use four decimal places.)
Previous question
Answers
The quadratic equation for the resistance ratio is 6E-06 t^2 + 0.00341t +1.
The temperature at which electric resistance would be double is 293.25 Fahrenheit.
Resistance predicted at 71 degrees is 1.2724.
What is resistance ratio?
The resistance ratio is the difference between the thermometer's resistance at the ice point and its resistance at a given temperature (t) (t0).
Temp t
in
degrees
(x) c(t) / c(0) (y) (x)2 (x)3 (x)4 xy x2 y
0 1 0 0 0 0 0
10 1.0393 100 1000 10000 10.393 103.93
20 1.0798 400 8000 16000 21.596 431.92
30 1.1215 900 27000 81000 33.645 1009.35
40 1.1644 1600 64000 2560000 46.576 1863.04
sum =100 5.405 3000 100000 2667000 112.21 3408.24
a. To calculate equation in the form of y = ax^2 + bx +c
Substituting the values calculated above in the formula
= 112.21 - (100*5.405) /5 =4.11
= 100000 - (3000*100)/5 =40000
= 2667000 -1800000 = 867000
a = { [ Σ x2 y * Σ xx ] - [Σ xy * Σ xx2 ] } / { [ Σ xx * Σ x2x 2] - [Σ xx2 ]2 }
= 6E-06
b = { [ Σ xy * Σ x2x2 ] - [Σ x2y * Σ xx2 ] } / { [ Σ xx * Σ x2x 2] - [Σ xx2 ]2 }
= 0.00341
c = [ Σ y / n ] - { b * [ Σ x / n ] } - { a * [ Σ x 2 / n ] } = 1.012
So the equation is c(t)/c(0) = 6E-06 t^2 + 0.00341t +1
b). c(t)/c(0) =2
Putting in the quadratic equation found above-
2 = 6E-06 t^2 + 0.00341t +1
1 = 0.00341t (neglecting the square term)
t = 293.25 fahrenheit
c). at 71 degrees
c(t)/c(0) = 0.030246+0.24211+1.012
= 1.27235
Resistance predicted at 71 degrees = 1.2724
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According to the psychoanalytic perspective a personality personality is based on
Answers
The psychoanalytic perspective states that a personality is based on the childhood experiences as well as unconscious mind.
What do you mean by psychoanalytic perspective?
In English, the terms psychoanalytic and psychoanalytical are employed. The latter phrase, which is older, originally just meant "related to the investigation of the human psyche." However, both titles evolved to refer to that as psychoanalysis became recognized as a separate therapeutic discipline. Even while both are still in use, psychoanalysis is the more common descriptor nowadays. Humans are defined as having sexual and violent urges from the perspective of a psychoanalytic lens.
Psychoanalytic theory of personality: a psychoanalytic approach that focuses on each person's unconscious thoughts, beliefs, and memories. It says that these traits affect our personalities and behaviors.
The three level of consciousness are:
Consciousness
According to Freud, every human has a conscious mind that stores all of the information they are aware of about their surroundings. Any ideas, emotions, or even easily recalled memories are all included in the conscious mind. It's all we already know and are conscious of.
Preconsciousness
The level immediately beneath aware is known as preconscious. Everything that is not in the conscious mind but may very simply be recalled and become conscious is included in the preconscious mind.
Unconsciousness
The unconscious mind is the third and last degree of consciousness. Anything that is suppressed, seems to have been forgotten, or any emotion or thought that is not conscious is what is known as the unconscious mind. This could include mistreatment or bullying of children toward their parents.
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Describe the principle, construction and working of Hydraulic brakes.
Answers
Answer:
E= mc^2
Explanation:
I don't know.Err.. why don't you ask another person
What is defined as a set of coordinates on a map grid? > ω
Answers
A set of coordinates on a map grid are called coordinate grid or grid squares.
The quadrants in which ordered pairings, or coordinates, are established typically have two or more intersecting lines. Coordinates are also used in maps.
Eastings and Northings, two types of grid lines, are what make up the grid squares you see on maps. Both Easting and Northing grid lines are numbered from west to east and from south to north, respectively. The vertical lines that separate the map's west and east halves are known as eastings.
GPS coordinates, which are frequently stated in alphanumeric characters, can be used to uniquely identify a specific geographic place on the planet. In this context, coordinates refer to the points where a grid system intersects. Typically, GPS coordinates are written as a combination of latitude and longitude.
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the distance a wave travels in a given amount of time is called wave
Answers
The wavelength of a wave is the distance it travels in the direction of propagation over a period of periodic time.
How far does a wave move in a given amount of time?The distance covered by a point on the wave pattern in one unit of time is referred to as wave speed. It specifies the speed at which the wave is travelling through the medium and is frequently measured in figures like meters/second. The distance an object goes in a certain amount of time determines its speed, whether it be an object or a wave.
What is the wave called?A wave is what? A wave is an energetic disturbance in a medium that doesn't include any net particle motion. Elastic deformation, a change in pressure, an electric or magnetic intensity, an electric potential, or a change in temperature are a few examples.
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1. An 95 N force has been applied to a block and move it 25 m along the direction of
the force. How much work has been done to the block?
Answers
Answer:
2375 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 95 × 25
We have the final answer as
2375 JHope this helps you
A grandfather clock pendulum reaches a maximum height of 18
cm each swing. If the mass of the pendulum bob is .85 kg,
what is the maximum potential energy for the pendulum bob?
J
Answers
The maximum potential energy for the pendulum bob is approximately 1.3817 J.
What is Potential Energy ?
Potential energy is a form of energy that an object possesses by virtue of its position, shape, or configuration. It is the energy that an object has due to the work done on it, or that it can do due to its position or state. The potential energy of an object is often associated with the force that acts on it.
The maximum potential energy for the pendulum bob can be calculated using the formula:
Potential energy = mgh
where m is the mass of the pendulum bob, g is the acceleration due to gravity, and h is the maximum height reached by the pendulum.
In this case, the mass of the pendulum bob is 0.85 kg, the maximum height reached by the pendulum is 18 cm or 0.18 m, and the acceleration due to gravity is 9.81 m/s^2. Substituting these values into the formula, we get:
Potential energy = 0.85 kg x 9.81 m/s^2 x 0.18 m
Potential energy = 1.3817 J (rounded to four decimal places)
Therefore, the maximum potential energy for the pendulum bob is approximately 1.3817 J.
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a car decelerates at a rate of 2.0 m/s^2 and comes to a complete stop after traveling 25 m. What was the speed of the car right before declaration?
Answers
Answer:
\( {v}^{2} = {u}^{2} + 2as \\ {0}^{2} = {u}^{2} + 2 (- 2)(25) \\ {u}^{2} = 100 \\ \therefore \: u = 10 \: m .{s}^{ - 1} \)
3. When a magnetic sector instrument was operated with an accelerating voltage of 4.50*103 V, a field of 0.251 T was required to focus the CH4 on the detector. a) What range of field strengths would be required to scan the mass range between 12.5 and 2.50*102 , for singly charged ion, if the accelerating voltage is held constant
Answers
Answer:
The answer is "\(4,500 - 225 \ V\)".
Explanation:
Using formula for calculating the Voltage:
\(M_1=12.5\\\\M_2=250\\\\V_1=4,500 \\\\\bold{\text{Formula: }}\\\\\to \bold{\frac{m_1}{m_2}=\frac{V_2}{V_1}}\\\\\to \frac{12.5}{250}=\frac{V_2}{4,500}\\\\\to 0.05=\frac{v_2}{4,500}\\\\\to 0.05\times 4,500= V_2\\\\\to V_2=225\\\\\)
Hence the range of accelerating in voltage is \(4,500 - 225 \ V\)
To measure the vast distance in space ,scientists use a unit called a ______, which is how far travels in one year.
The closest star to Earth is ______.
(Look at the picture)
Answers
Answer:
"light year" - about 6 million million miles
The nearest star is alpha Centauri - about 24 million million miles away
What was the average speed in km/h of a car that travels 788 km in 7.1 h?
Answers
Answer:
Well the answer is 111 (rounded) km/h
Explanation:
788/7.1 is 110.9... so if you round it it would equal 111.
Can you help me please here is the picture DUE NOW PLEASE.
Answers
they are formed when hot
it's dependent on the rate of cooling of the melt, slow cooling allows large crystals to form, fast cooling yields small crystals. They cool too quickly to form crystals.
Hope this helps! <3 :3
The energy an object possesses due to its motion
Answers
Amount:
Mechanical energy is the energy possessed by an object due to its motion or its stored energy of position. Mechanical energy can be either kinetic (energy of motion) or potential (energy of position). An object that possesses mechanical energy is able to do work.
When a pencil 10 cm long is placed vertically 100 cm from a lens of focal length +50 cm, image is
Answers
Answer:
Explanation:
When a pencil 10 cm long is placed vertically 100 cm from a lens of focal length +50 cm, image is formed at a distance of 50 cm from the lens. The image is inverted and is 50 cm tall.
Find the slope of each of the following lines.
5. Two points on the line are (1,1) and (5,9)
6. Two points on the line are (0,0) and (-3,6)
help asap..
Answers
Answer: 2, -2
Explanation:
5th answer: Slop= (9-1)÷(5-1) = 2
6th answer: Slop= (6-0)÷(-3-0) = -2
lorem lorem lorem lore
Answers
Answer:
what-
Explanation:
a healthy person has a body temperature of 37 degree celsius. if they jump into an ice bath after sports training their temperature only decreases slowly. how can you explain this when a lump of metal at 37 celsius degree placed in the same ice bath cools down to 0 celsius degree in only a couple of minutes
Answers
1. Heat Capacity: The heat capacity of the human body is much higher than that of a small lump of metal. The human body has a large mass and contains a significant amount of water, which has a high heat capacity. This means that it requires more energy to change the temperature of the body compared to a small metal object. As a result, the body cools down more slowly in the ice bath.
2. Insulation: The human body is well-insulated with layers of skin, fat, and clothing. These layers act as thermal barriers and slow down the transfer of heat between the body and the surroundings. On the other hand, a small metal object does not have any significant insulation, allowing heat to transfer more rapidly to the colder environment.
3. Biological Regulation: The human body has mechanisms to regulate its temperature, such as vasoconstriction (narrowing of blood vessels) and shivering, which help generate heat and maintain core temperature. These regulatory processes help to slow down the cooling process and preserve the body's temperature within a narrow range.
4. Surface Area-to-Volume Ratio: The surface area-to-volume ratio is higher for a small lump of metal compared to a human body. A higher surface area facilitates faster heat transfer. Since the metal object has a relatively larger surface area compared to its volume, it cools down more quickly in the ice bath.
Overall, the combination of the human body's higher heat capacity, insulation, biological regulation, and lower surface area-to-volume ratio compared to a small metal object contributes to the slower cooling rate when immersed in an ice bath.
how we interact to a human person or people in a good way
Answers
Answer:
We show concern and show support
In a DC generator, the generated emf is directly proportional to the
Answers
In a DC generator, the generated electromotive force (emf) is directly proportional to the rotational speed of the generator's armature and the strength of the magnetic field within the generator.
This relationship is described by the equation for the generated emf in a DC generator:
Emf = Φ * N * A * Z / 60
Where:
Emf is the generated electromotive force (in volts),
Φ is the magnetic flux density (in Weber/meter^2\(meter^2\) or Tesla),
N is the number of turns in the armature winding,
A is the effective area of the armature coil (in square meters),
Z is the total number of armature conductors, and
60 is a constant representing the conversion from seconds to minutes.
From this equation, we can see that the generated emf is directly proportional to the magnetic flux density (Φ) and the product of the number of turns (N), effective area (A), and the total number of armature conductors (Z). This means that increasing any of these factors will result in a higher generated emf.
The magnetic flux density (Φ) can be increased by using stronger permanent magnets or increasing the strength of the field windings in the generator.
The number of turns (N) and the effective area (A) are design parameters and can be optimized for a specific generator. Increasing the number of turns or the effective area will result in a higher generated emf.
Similarly, the total number of armature conductors (Z) can be increased to enhance the generated emf.
By controlling and optimizing these factors, the generated emf in a DC generator can be increased, resulting in higher electrical output. However, it is important to note that there are practical limits to these factors based on the design and construction of the generator.
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Which description tells two processes scientists think move Earth's lithospheric plates?
Responses
friction between the plate and the asthenosphere and pressure of magma on the edge of the plate
friction between the plate and the asthenosphere and pressure of magma on the edge of the plate
gravity acting on the edges of plates and convection in the mantle
gravity acting on the edges of plates and convection in the mantle
gravity acting on the edges of plates and friction between the plate and the asthenosphere
gravity acting on the edges of plates and friction between the plate and the asthenosphere
convection in the mantle and pressure of magma on the edge of the plate
Answers
The description that tells two processes that scientists think move Earth's lithospheric plates is convection in the mantle and pressure of magma on the edge of the plate.
What is the Earth's lithosphere?The Earth's lithosphere is the rocky outer part of Earth which is made up of the brittle crust and the top part of the upper mantle.
The Earth's lithosphere deflects the convections and as the convections churn clockwise of anticlockwise, they drag the lithosphere with it via friction an this is what is stipulated to cause tectonic plate movements.
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Answer: convection in the mantle and pressure of magma on the edge of the plate
Explanation: I took the unit test
Pls quickly brainliest to the first to anwser
Answers
Answer:
8m/s^2
Explanation:
hope it helps........
Explanation:
you're supposed to know the formula of acceleration which is velocity of a time then you can solve the question
which diagram is correct?
Answers
The correct diagram would be W.
What is Coloumb 's Law ?Coloumb's law is the magnitude of electrostatic force of attraction or repulsion is directly proportional of two charges and inversly proportional to the square of the radius.
F=kq1q2/r²
Where k is coulomb constant the value is 9×10⁹
q 1 and q2 are two point charges.
r is radius and F is electrostatic force .
The example of Coulmb's law are comb and bitof papers . Charges get deposit on the teeth of a comb when it is rubbed against hair.
W is right because when two like charges are in close vicinity then they repel each other and if there is unlike charge then it will attract each other .
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Which are uses of convex mirrors? Check all that apply.
magnifying mirrors for putting on makeup
side-view mirrors on vehicles
hallway safety mirrors
focusing automobile headlights
lenses in sunglasses
Answers
Answer:
B. Side-view mirrors on vehicles
C. Hallway safety mirrors
E. Lenses in sunglasses
Explanation:
Trust Me, Look At Attachment.
Answer:
2, 3, and 5 on Edge, 2022.
Explanation:
I had this question on Edge.
(See the attachment below.)
The rest of the answers are:
O Slide 8 - Sample Response: The image seems to be behind the mirror, but nothing is really there.
O Slide 9 - Concave
O Slide 10 - Same size
what is this.
best answer gets brainiest
Answers
Answer:
the Thanksgiving turkey
1. List five examples of pseudoscience found on the Internet. These could be websites, blogs, or online newspaper and magazine articles.
Answers
The five examples of pseudoscience found on the Internet include the following:
Ancient Astronauts and Crop CirclesMoon Landing Conspiracy or the Flat EarthAstrologyPolygraphs and HypnosisConversion TherapyWhat are Pseudosciences?Pseudosciences is defined as the science that is regarded as false science because it deals with something that has no connection to proper scientific methodology and cannot be proven realistically.
The different types of Pseudosciences include the following:
Ancient Astronauts and Crop Circles: This believes that a point in time, that aliens must have visited the earth to influence civilization.Moon Landing Conspiracy or the Flat Earth: This believed that original moon landing by astronauts didn't occur and that the earth is flat in shape.Astrology: This believes that celestial bodies have some effect on the behavior or future of a person's life.Polygraphs and Hypnosis.Conversion Therapy.Learn more about earth shape here:
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