The mercury thermometer operates on the principle of dilation.
What is the working principle of a mercury thermometer?Like all liquids, mercury expands as it is heated, so it moves along the thermometer tube, determining the temperature. Its expansion rate is calibrated on the glass scale, expansion is linear and can be accurately calibrated.
Mercury allows it to be used in a thermometer by its liquid expansion fast enough to measure something so that it still maintains an accurate measurement.
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what is contact and non-contact force ?
define frictional force ,normal reaction force, tension force as applied through string,force exerted by spring, force exerted by during collision, gravitational force , electrostatic force ,magnetic force.
Explanation:
Hello !
Contact force:-A contact force is any force that requires contact to occur. examples Applied force,
Normal force,
Frictional force,
Tension force,
Air resistance force,
Spring force.
Non-contact force:-is a force which acts on an object without coming physically in contact with it. types of non-contact forces are gravitational force, magnetic force, electrostatic and nuclear force.
frictional force:-is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
Normal reaction force:-A force acting perpendicular to two surfaces in contact with each other.
The tension force is defined as the force that is transmitted through a rope, string or wire when pulled by forces acting from opposite sides.
The force exerted by a spring on objects attached to its ends is proportional to the spring's change in length away from its equilibrium length and is always directed towards its equilibrium position. F = -kx. The proportional constant k is called the spring constant.
During the collision, each body exerts a force on the other. This force is called an impulsive force.
The gravitational force :-is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart.
The electrostatic force is also known as the Coulomb force or Coulomb interaction. It's the attractive or repulsive force between two electrically charged objects.
magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion.
Which bronchus is about 5cm long and slightly narrower and more horizontal than the one on the opposite side
The bronchus of 5cm long, slightly narrower and more horizontal than the one on the opposite side is the left main bronchus.
What is a bronchus?A bronchus is a tubular structure that links the trachea with the lungs in the respiratory airways.
The main function of the bronchus is to transport oxygen during gas exchange, which is required in cellular respiration.
In conclusion, the bronchus of 5cm long, slightly narrower and more horizontal than the one on the opposite side is the left main bronchus.
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What is bioluminescence?
A. It is when living creatures absorb light.
B. It is when living creatures reflect light.
C. It is when living creatures produce light.
D. It is when living creatures destroy light.
Answer:
C.
Explanation:
Bioluminescence is the fascinating natural phenomenon by which living creatures produce light.
how does the temperature of water change when it is heated on a stove top and then begins to boil?
Answer:
C
Explanation:
First the water heats up to the boiling point ( temp increases)
then, as it boils it remains at constant temp ( boiling point)
The temperature of water changes when it is heated as it increases first and then remains constant. So, option C is correct.
What is boiling?When a liquid is heated to its boiling point, the temperature at which the vapor pressure of the liquid equals the pressure that the surrounding environment exerts on the liquid, boiling is the fast vaporization of the liquid that takes place.
Boiling can be divided into two primary categories: nucleate boiling, in which tiny bubbles of vapor develop at specific locations, and critical heat flux boiling, in which the boiling surface is heated above a critical temperature and a film of vapor forms on the surface. Transition boiling is an unstable, transitional kind of boiling that contains both sorts of components. Due to the decreased air pressure found at higher elevations, water's boiling point, which is 100 °C or 212 °F, is lower.
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A copper block rests 30.0 cm from the center of a steel turntable. The coefficient of static friction between the block and the surface is 0.53. The turntable starts from rest and rotates with a constant angular acceleration of 0.50 rad/s2. After what time interval will the block start to slip on the turntable?
pls explain the question briefly
Answer:
refer to the above attachment
A brass measuring tape is correct at 20°C. The value obtained when the length of a field is measured with the rule at 50°C appears to be 70.5 m. What is the true length of the field? Linear expansivity of brass = 1.8 x 10-5 K-1,
Answer:
A 2kg block is moved a long a level floor by a horizontal force of 20N if the coefficient of sliding friction is 0.4
what is the acceleration of the blove
What do we generally avoid in a many-to-many junction table?
It is important to avoid an autoincrement primary key column in a many-to-many junction table.
What is a many-to-many junction table?A many-to-many junction table is a junction table which links multiple data in one table to multiple data in another table.
Generally in a many-to-many junction table, it is important to avoid an autoincrement primary key column.
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Which part of the curve shows:
a. acceleration
b. zero acceleration
c. deceleration
d. zero velocity
Answer / Explanation:
acceleration is essentially increasing in velocity. [acceleration is literally velocity over time]
So, we can see acceleration on this velocity/time graph (the y-axis is representative of velocity).
Meaning that...
When we increase in velocity, that is acceleration. [A]
When we stay at the same velocity, that is zero acceleration. [B]
> (we are not increasing {acceleration} or decreasing {deceleration} in velocity/ acceleration over time)
When we decrease in velocity, that is deceleration. [C]
When we have no velocity (velocity = 0), that is zero velocity. [D]
So, this curve is already in order of A-B-C-D.
(origin/0 to A = acceleration)
(A to B = zero acceleration)
(B to C = deceleration)
(C to S = zero velocity)
hope this helps!!
Answer:
O - A : acceleration
A - B : zero acceleration
B - C : deceleration
C - S : zero velocity
Explanation:
acceleration is velocity over time, meaning that the slope of the graph is showing acceleration
5. A weightlifter lifts a barbell of mass 50 kg to a height of 2m in 3s. (Take g = 9.8 m/s².) a) What is the weight of the barbell? 5. A weightlifter lifts a barbell of mass 50 kg to a height of 2m in 3s . ( Take g = 9.8 m / s² . ) a ) What is the weight of the barbell ?
Answer:
490N
Explanation:
W=m×g
W=50×9.8=490N
Which best describes the difference between internal and thermal energy?
A. Internal energy is the total potential energy in a substance, and thermal energy is the total kinetic energy in a substance.
B. Thermal energy is the total potential energy in a substance, and internal energy is the total kinetic energy in a substance.
C.Internal energy is the total potential and kinetic energies in a substance, and thermal energy is the part of internal energy that can be transferred to another substance.
D. Thermal energy is the total potential and kinetic energies in a substance, and internal energy is the part of internal energy that can be transferred to another substance.
ITS C!!!!!!!!!!!!!!!
.Internal energy is the total potential and kinetic energies in a substance, and thermal energy is the part of internal energy that can be transferred to another substance. Thus, option "C" is correct.
What is the thermal energy Meaning?Thermal energy, is internal energy present in a system in a form of thermodynamic equilibrium probity by its temperature.
Thermal energy cannot be transformed to useful work as easily as the energy of systems that are not in conditions of thermodynamic equilibrium.
Thus, option "C" is correct
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which process produces the energy that powers a solar calculater
Nuclear fusion is the process which produces the energy that powers a solar calculator.
What is Nuclear fusion?
This process involves the fusion of hydrogen atoms to form helium with accompanying release of heat energy.
The heat energy is what powers the solar calculator thereby making it the most appropriate choice.
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(a) that the acceleration (A) will have no components that are identically zero. (B) may have some components that are identically zero. (C) will have only a z component that is identically zero. (D) will have an identically zero z component, and maybe an identically zero component in the x or y directio
Answer:
D.
Explanation:
acceleration in the z component = velocity in z component / time. The question states velocity in z component is zero. Therefore, acceleration in z component = 0/time = 0.
Now the question does not specify whether the other velocity vectors (x or y) is zero or not. So its D.
1. our entire solar system orbits around the center of the about once every 230 million years. 2. the milky way and andromeda galaxies are among a few dozen galaxies that make up our . 3. the sun appears to rise and set in our sky because earth once each day. 4. you are one year older each time earth about the sun. 5. on average, galaxies are getting farther apart with time, which is why we say our is expanding. 6. our is moving toward the star vega at about 70,000 km/hr.
(1) Our entire solar system orbits around the center of the Milky Way Galaxy about once every 230 million years.
(2) The milky way and andromeda galaxies are among a few dozen galaxies that make up our Local Group.
(3) The sun appears to rise and set in our sky because earth rotates once each day.
(4) You are one year older each time earth orbits about the sun.
(5) On average, galaxies are getting farther apart with time, which is why we say our universe is expanding.
(6) Our solar system is moving toward the star vega at about 70,000 km/hr.
1.0 Revolution of the solar systemOur entire solar system orbits around the center of the Milky Way Galaxy about once every 230 million years.
2.0 Milky Way and Andromeda galaxiesThe milky way and andromeda galaxies are among a few dozen galaxies that make up our Local Group.
3.0 Rotation of the Earth
The sun appears to rise and set in our sky because earth rotates once each day.
4.0 Revolution of the EarthYou are one year older each time earth orbits about the sun.
5.0 Expansion of the universeOn average, galaxies are getting farther apart with time, which is why we say our universe is expanding.
6.0 Motion of the solar systemOur solar system is moving toward the star vega at about 70,000 km/hr.
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You pushes a 25kg box with 40 N of force, but the friction on the crate is 15 N. What is the net
force?
Answer:
25 N in the direction of your push
Explanation:
The friction force acts against your pushing force....it reduces the net amount of force you are exerting
Net force = 40 - 15 = 25 N
the efficiency of a canot engine is more when the temperature of the sink is increased by 50%
The efficiency of a carnot engine is more when the temperature of the sink is increased by 50% is 33.33%
What is Efficiency?The efficiency is defined as the work done by the engine divided by the heat supplied.
Work done is the difference between the heat supplied and heat rejected.
So, efficiency η = 1 - T₁/T₂
Where T₁ is the lower temperature and T₂ is the higher temperature.
The temperature of the sink is increased by 50%. If the lower temperature is T₁, then the higher temperature will be 1.50T₁
Substitute the value into the expression , we get
η = 1 - T₁ / 1.5T₁ x 100 %
η = 33.33 %
Thus, the efficiency of the carnot engine is 33.33 %
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Which list places the three types of radiation in order from least penetrating to most penetrating?
a. gamma, alpha, beta
b. gamma, beta, alpha
c. alpha, beta, gamma
d. alpha, gamma, bet
alpha < beta < gamma.
What are the properties of Alpha , Beta , Gamma Rays?
Gamma rays are parts of electromagnetic spectrum.
1. Gamma rays travel with the speed of light with maximum velocity.
2. Gamma rays do not have mass have maximum penetrating power.
Beta rays are negatively charged and have negligible mass.
1. Neutron is divided into proton and electron on emission of beta particles.
2 .Beta particles have less mass and very high velocity, so their penetrating power is more than alpha particles.
Alpha rays are positively charged it contain high energy Helium nucleus with 2 proton and 2 neutron.
1. Mass of Alpha rays are 4u
2. Alpha rays are heavier and maximum charged than beta and gamma particles.
3.Alpha particles have least penetration power it can't travel more than 10-18 cm.
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If we rub two neutral objects
Answer:
electrons can be knocked loose from one object and picked up by the other. The object that gains electrons becomes negatively charged, while the object that loses electrons becomes positively charged.
Question 10 of 25
Which of these is an advantage of hydroelectric energy?
OA. Is expensive to build or maintain
OB. Harms aquatic organisms
OC. Is a renewable energy source
OD. Is available in limited areas
SU
The main advantage of hydroelectric energy is the fact that it is a renewable energy source (Option C).
What is hydroelectric energy?Hydroelectric energy refers to the energy from water bodies that can be used to generate electricity.
Hydroelectric energy is stored as potential energy and then converted to kinetic motion energy to be converted into electricity.
Hydroelectric energy is renewable because it is indefinitely generated by water bodies in nature.
In conclusion, the main advantage of hydroelectric energy is the fact that it is a renewable energy source (Option C).
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What happens during nuclear fission?
Answer:
During nuclear fission, a neutron collides with a uranium atom and splits it, releasing a large amount of energy in the form of heat and radiation. More neutrons are also released when a uranium atom splits. These neutrons continue to collide with other uranium atoms, and the process repeats itself over and over again.
Explanation:
In nuclear fission the nucleus of an atom breaks up into two lighter nuclei. The process may take place spontaneously in some cases or may be induced by the excitation of the nucleus with a variety of particles (e.g., neutrons, protons, deuterons, or alpha particles) or with electromagnetic radiation in the form of gamma rays. In the fission process, a large quantity of energy is released, radioactive products are formed, and several neutrons are emitted. These neutrons can induce fission in a nearby nucleus of fissionable material and release more neutrons that can repeat the sequence, causing a chain reaction in which a large number of nuclei undergo fission and an enormous amount of energy is released. If controlled in a nuclear reactor, such a chain reaction can provide power for society’s benefit. If uncontrolled, as in the case of the so-called atomic bomb, it can lead to an explosion of awesome destructive force.
Answer:
In nuclear fission, atoms are split apart, which releases energy. All nuclear power plants use nuclear fission, and most nuclear power plants use uranium atoms. During nuclear fission, a neutron collides with a uranium atom and splits it, releasing a large amount of energy in the form of heat and radiation.
Answer the following questions clearly and thoughtfully.
1. If you were governor of your state...
A. What are two things you would do to protect wetlands? (2 points)
B. What are three important things wetlands can do that make them worth
protecting? (3 points)
I need help
A) Formulate policies to protect wetlands and ensure that the policies are enforced.
B) Wetlands hold important biodiversity. They are a source of foods, medicines, and raw materials. They help with stabilizing the climate.
WetlandsAs a governor of my state, the two most important steps to protect wetlands include:
Formulate relevant policies through consultation with different stakeholdersEnsure that the policies are enforced. Wetlands are homes to many important plant, animal, and microbe species. Some of these species serve as foods, raw materials, and medicines for humans and their livestock.Wetlands help sequestrate carbon dioxide and as such, help with the regulation of climate.More on wetlands can be found here: https://brainly.com/question/11438518
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To protect the wetlands, I will ensure a strict enforcement of all existing state laws on the conservation of wetlands.
What are wetlands?The wetlands are those areas that consists of marshes and swamps. They are of great important to the ecosystem and biodiversity.
a) The two things that I will do to protect wetlands are;
I will ensure that the areas that drain into the wetlands are kept clean from contaminants such as pesticides and other chemicals.I will ensure a strict enforcement of all existing state laws on the conservation of wetlands.b) Wetlands are very important because;
They are very important in erosion controlThey help to preserve biodiversityThey are important components of the biogeochemical cycles of water, nitrogen and sulfur.Learn more about wetlands:https://brainly.com/question/11438518
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Suppose a creature from another planet has eyes that are sensitive to infrared radiation. Describe what the alien would see if it looked around your library. In particular, what would appear bright and what would appear dim
The incandescent lamp will glow quite brightly in the eyes of the creature because emits less visible light and more infrared light.
What is infrared light?The infrared light is a part of the electromagnetic spectrum that is emitted by a hot object.
As such, the incandescent lamp will glow quite brightly in the eyes of the creature because emits less visible light and more infrared light. The florescent light which does not produce inferred rays will not be visible at all.
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What is the kinetic energy of a 12 kg ball moving at a speed of 15 m/s?
Answer:
1350 N
Explanation:
KE = ½mv²
KE = ½(12)(15²)
KE = 1350 N
Which law of motion explains what happens during a ride on the bumper cars ?
Answer:
Newtows first law of motion
What are Quartz-crystal Clocks??
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_
_
_
Don't spam.
Answer:
It is a piezoelectric material. It produces and accumulates electric charge when subjected to mechanical stress
forces if magnitude 2,5 and 4 units lie in the direction 45°,90° and 135° respectively. Find: A. the magnitude. B. the direction of their resultant
A. The magnitude is 9.47N
B. The direction of the resultant force is 90°
We use vectors in answering this question.
F₁ = 2N 45°
F₂ = 5N 90°
F₃ = 4N. 135°
For the magnitude, we use vector addition twice
Consider forces F₁ and F₃
Notice that F₁ and F₃ are at right angles to each otherUsing vector summation, the net forces of F₁ and F₃ say F₀ is the square root of the summation of the squares of F₁ and F₃F₀ = 4.47N
Since F₁ and F₃ are at 45° and 135° respectively, their net force F₀ is at 90°, along the line of F₂
Fnet = F₀ + F₂ = 4.47 + 5 = 9.47N
A. The magnitude is 9.47N
B. The direction of the resultant force is 90°
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Which lens combination is used to treat presbyopia ~
Answer:
People with presbyopia require a convex lens for reading glasses; specialized preparations of convex lenses usually require the services of an optometrist
What type of reaction is being shown in this energy diagram?
A. Endothermic, because the reactants are higher in energy
B. Exothermic, because the products are higher in energy
C. Endothermic, because the products are higher in energy
D. Exothermic, because the reactants are higher in energy
[tex]\quad \huge \quad \quad \boxed{ \tt \:Answer }[/tex]
[tex]\qquad \tt \rightarrow \:Exothermic \:\;Reaction[/tex]
[ because reactants higher in energy ]
____________________________________
[tex] \large \tt Explanation \: : [/tex]
By the given graph, conclusion can be made that reactants have higher energy than products, hence for the reaction to take place, reactants must loose energy to form products. And once the energy is released, that reaction is called Exothermic.
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If a sound increases 5 db, the sound becomes _______ times louder.
a. five
b. ten
c. three
d. fifteen
Answer:
If a sound increases 5 db, the sound becomes three times louder.
Explanation:
A projectile is launched at an angle of 29 degrees above the horizontal with an initial velocity of 36.6 at an unknown height.
The magnitude of the vertical velocity upon returning to its original, unknown height is _____ m/s.
The magnitude of the unknown height of the projectile is determined as 16.1 m.
Magnitude of the height
The magnitude of the height of the projectile is calculated as follows;
H = u²sin²θ/2g
H = (36.6² x (sin 29)²)/(2 x 9.8)
H = 16.1 m
Thus, the magnitude of the unknown height of the projectile is determined as 16.1 m.
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Gold-198 has a half-life of 2.7 days. Complete the table for an initial sample size of 200 grams
25.1 grams are still present after 8.1 days. When the Gold-198 has a half-life of 2.7 days.
What is radioactivity?The act of producing radiation spontaneously is known as radioactivity. This is accomplished by an unstable atomic nucleus that wants to give up some energy in order to move to a more stable form.
The half-life of the gold =2.7 days
Sample size = 200 grams
N is the left amount after the given time =?
Constant of rate = 0.26
The rate constant is found as;
[tex]\rm \lambda = \frac{0.693}{t^{\frac{1}{2}}} \\\\ \lambda = 0.256 \ days^{-1}[/tex]
The amount after the given time;
[tex]\rm N=N_0 \times e^{-\lambda t} \\\\\ N = 200 \times e^{-0.256 \times 8.1 \ days} \\\\N=25.1 \ gm[/tex]
Hence,25.1 grams are still present after 8.1 days.
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