Answer:
A mercury-used clinical thermometer has a kink near its bulb because
Explanation:
it helps to slow mercury going back to the bulb and get the accurate temperature.
The coefficient of sliding friction on concrete is 0.30. what weight of steel can be pulled across a concrete floor by a winch with a capacity of 450 lbs?
The weight of steel can be pulled across a concrete floor by a winch with a capacity of 450 lbs to 1500 lb.
Around 7850 kg/m3, or 7.85 g/cm3, or 490 lbs/ft3, or 13231 lbs/yd3, is the unit weight of steel. The primary usage of the steel bars is as reinforcement to increase the tensile strength of concrete constructions. The weight of steel is typically expressed in kilogrammes, tonnes, and pounds.
Calculate the amount of steel in the slab as 1% of the concrete volume (0.01 x 7850 x 3 = 236kg):
Using the Thumb Rule Given that steel has a density of 7850 kg/m3, the amount of steel needed for an RCC slab should be 1% of the entire volume of concrete, or 236 kg.
The unit weight of structural steel is taken to be 7850 kg/m3 or 78.50 kN/m3 or 7.85 g/cm3 or 490 lbs/ft3 or 13,231 lbs/yd3 according to IS code and Indian standard.
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A 9V battery supplies power to a cordless curling iron with a resistance of 18 ohm how much current is flowing through the curling iron
Answer:
V = IR
V = voltage = 9 volts
I = current
R = resistance = 18 ohms
V = IR
9 = I·18
The combination of coke and steam produces a mixture called coal gas, which can be used as a fuel or as a starting material for other reactions. the equation for the production of coal gas is:_______
Coal gas is produced by using the following equation: 2C (s) + 2 H,O (g) CH, (g) + CO.
What is coal gas?Coal gas is a mixture of methane and carbon dioxide that is created when coke and steam are combined. Gas from coal can be burned as fuel or employed as a catalyst in other chemical reactions.
How are coal tar, coal gas, and coke produced?When heating coal without the presence of air. It generates gas known as coal gas. It creates a substance known as coal tar. Additionally, coke, a solid residue, is created.
Coal gas is a fuel composed of hydrogen, oxygen, and carbon.
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When earth catches up to a slower-moving outer planet and passes it in its orbit, in the same way that a faster runner overtakes a slower runner in an outside lane, the outer planet.
When earth catches up to a slower-moving outer planet and passes it in its orbit, in the same way that a faster runner overtakes a slower runner in an outside lane, the outer planet exhibits retrograde motion.
What do you mean by retrograde motion?
Retrograde motion, in astronomy, the actual or apparent motion of a body in the opposite direction to the direction of the (direct) motions of most members of the solar system or other astronomical systems with a preferred direction of motion. Viewed from a position in space north of the Solar System (from some great distance above Earth's north pole), all the major planets revolve around the Sun in a counterclockwise direction, and all but Venus and Uranus rotate counterclockwise about their own axes; these two, therefore, have retrograde rotation. Of the known satellites of the planets, a minority show retrograde revolution. These include the four outermost moons of Jupiter; Phoebe, Saturn's outermost moon; and Triton, the largest of Neptune's moons. The orbital planes of the satellites of Uranus are so strongly inclined that describing the motion of these bodies as retrograde or direct has little meaning. The rotations around the Sun of all known asteroids are direct; of the known periodic comets, only a few, one of which is Halley's Comet, move in a retrograde orbit.To learn more about retrograde motion, refer to:
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What is the symbol, atomic number, # of protons, # of electrons, atomic mass, rounded atomic mass, # of neutrons (show work), and period of: aluminum
The properties of aluminum are as follows:
symbol = Alatomic number = 13number of protons = 13number of electrons = 13atomic mass = 26.981539 urounded atomic mass = 27 amunumber of neutrons = 14period : belongs to period 3What are elements?Elements are pure substances which are composed of the same type of atoms.
Elements are the building block of all forms of matter.
Aluminum one of the known 118 elements.
In the period table, aluminum has the following properties:
symbol = Alatomic number = 13number of protons = 13number of electrons = 13atomic mass = 26.981539 urounded atomic mass = 27 amunumber of neutrons = 14period : belongs to period 3In conclusion, aluminum is an element in the periodic table.
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During a baseball game, a batter hits a high
pop-up.
If the ball remains in the air for 5.86 s, how
high above the point where it hits the bat
does it rise? Assume when it hits the ground
it hits at exactly the level of the bat. The
acceleration of gravity is 9.8 m/s².
Answer in units of m
Answer:
Доброе утро, ответ 5+5="4
Explanation:
A 12-n force is applied at the point x=3m, y=1m. find the torque about the origin if the force points in (a) the x direction, (b) the y direction, and (c) the z direction.
The torque about the origin if the force points in (a) the x direction, (b) the y direction, and (c) the z direction are 12; 36; 37.9 respectively
Torque is a twisting force produced by applying a force at a distance from a point. We would need to choose a distance that is perpendicular to the force's direction. We apply the equation to determine torque,
T=Fd
where F is the force and d is the orthogonal distance to a central point.
i. If the force points in the x-direction, we need to use the y-distance to calculate torque.
T=Fxdy
T=12N *1m
T = 12 N.m
ii. If the force points in the y-direction, we need to use the x-distance to calculate torque.
T=Fxdy
T= 12N * 3m
T = 36 N.m
iii. If the force is directed in the z-direction, the straight-line distance from the origin to the point is orthogonal to the force. The magnitude of the distance will be used as the distance value. This may be determined using the equation.
||d||= √ (X2 + Y2)
where X and Y are the x and y coordinates.
T=Fz||d||
T=(12N) (√ (32 + 12)
T = 37.9 N.m
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A 60.0-cm long string with a mass 8.00 g has a tension 200 n. what is the fundamental frequency of this string?
The fundamental frequency is 102.06 Hz m/s.
We need to know about the fundamental resonant frequency to solve this problem. When the string is vibrating at its lowest resonant frequency, it should follow the rule
λ = 2L
where λ is wavelength and L is the length of string
The transverse waves on a string also can be defined as
v = √(F . l/m)
where v is velocity, F is string tension, l is the length of string and m is mass
From the question above, we know that
l = 60 cm = 0.6 m
m = 8 g = 8 x 10¯³ kg
F = 200 N
By substituting the following equation, we can calculate the wavelength
λ = 2L
λ = 2 . 0.6
λ = 1.2 m
Find the speed of the wave
v = √(F . l/m)
v = √(200 . 0.6/(8 x 10¯³))
v = 122.47 m/s
Find the frequency
v = λ . f
122.47 = 1.2 . f
f = 102.06 Hz
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What is the change in entropy when 2.00 kgof water at is heated to 100 degrees cel form steam at ?
The entropy change when 2.00 kg of water at 100°C is heated to form steam at 100°C is 12.1kJ/K.
Entropy is a metric for a system's unpredictability or disorder. The mass of a system affects the value of entropy. It has units of joules per kelvin and is represented by the letter S. The value of entropy can be either positive or negative.
Total energy change = latent heat of of vapourization × mass
Total energy change = [tex]2.26[/tex] × [tex]10^{6}[/tex] × 2
Total energy change = 4520kJ
Now, entropy change is given as:
Δ[tex]S = \frac{Total energy change}{Temperature}[/tex]
Δ[tex]S = \frac{4520}{273.15+100}[/tex]
Entropy = 12.1kJ/K
Therefore, the entropy change when 2.00 kg of water at 100°C is heated to form steam at 100°C is 12.1kJ/K.
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The coal has 50 J of potential energy and no kinetic energy. It is burned in the power plant to produce electrical energy, but only 20 J of electrical energy is produced.
Which of the following may account for this?
Some of the coal's energy was destroyed by the fire.
Some of the coal's energy was turned into other forms.
The fire was used to create the electrical energy from scratch.
Some of the coal's energy was turned into other forms of energy.
What is conversion of energy?According to the first law of thermodynamics, energy can neither be created nor destroyed but is converted from one form to another. We know that from the first law of thermodynamics, the energy that originally in the coal does not vanish into thin air but undergoes a conversion.
Thus, want to find out what accounts for the energy of the coal. Thus, we could say that some of the coal's energy was turned into other forms as this is in consonance with the first la of thermodynamics.
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A car travelling at 91.0 km/h approaches the turnoff for a restaurant 30.0 m ahead. If the driver slams on the brakes with an acceleration of -6.40 m/s2
2
what will her stopping distance be?
The stopping distance of the car is 49.9 m
Data obatined from the questionThe following data were obtained from the question:
Initial velocity (u) = 91 Km/h = 91 / 3.6 = 25.28 m/sAcceleration (a) = -6.4 m/s²Final velocity (v) = 0 m//s Stopping distance (s) = ?How to determine the stopping distanceThe stopping distance can be obtained as illustrated below:
v² = u² + 2as
0² = 25.28² + (2 × -6.4 × s)
0 = 639.0784 - 12.8s
Collect like terms
-12.8s = 0 - 639.0784
-12.8s = -639.0784
Divide both sides by -12.8
s = -639.0784 / -12.8
s = 49.9 m
Thus, the stopping distance of the car is 49.9 m
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in a slap shot, a hockey player accelerates the puck from a velocity of 11 m/s to 50 m/s in the same direction. if this takes 3.33x10^-2 s, calculate the distance over which the puck accelerates
The distance traveled by the puck is 0.203 m.
What is distance?This can be defined as the length between two points.
To calculate the distance which the puck accelerate, we use the formula below.
Formula:
S = (v+u)t/2.......... Equation 1Where:
S = Distancev = Final velocityu = Initial velocityt = TimeFrom the question,
Given:
v = 50 m/su = 11 m/st = 3.33×10⁻³ sSubstitute these values into equation 1
S = (50+11)3.33×10⁻³ /2S = 0.203 mHence, the distance traveled by the puck is 0.203 m.
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A particle is executing accelerated motion. The acceleration is constant in magnitude but
not in direction. Predict the path followed by the particle. How will you find the speed of the
(2)
particle?
When the magnitude remains came and the direction changes the particle is moving in a circular motion. Speed is equal to the arc length traveled (S) divided by the change in time (Δ),
A particle travels in a uniform circular motion while maintaining a constant speed. The radius R of the circle sweeps out the angle, and the particle's velocity vector v in the illustration has a constant magnitude but changes direction as it advances from location B to position C.
The isosceles triangles OBC and DEF are identical because OB and OC are perpendicular to the velocity vectors, and as a result, the ratio of the chord BC to the radius R is the same as the ratio of the magnitudes of v to v. The chord BC and the arc BC approach one another as approaches zero, and the chord can be replaced by the arc in the ratio.
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J. J. Thomson created an apparatus composed of a sealed glass tube with electrodes of different polarities fixed at each end. By passing a high voltage through gas in the sealed tube, he was able to create a cathode ray. What did thompson call the particles that make up a cathode ray?.
J. J. Thompson created an apparatus composed of a sealed glass tube with electrodes of different polarities fixed at each end. By passing a high voltage through the gas in the sealed tube, he was able to create a cathode ray. J.J. Thompson called the particles that makeup cathode rays as negatively charged particles.
In the experiment, the flow of particles was from the negative terminal (cathode) to the positive terminal (anode). He also placed two plates of opposite charges around the cathode rays. The cathode rays were deflected towards the positive place.
J.J Thompson concluded that the cathode rays were composed of negatively charged particles.
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Sodium vapor lamps, used for public lighting, emit yellow light of a wavelength of 570 nm. How much energy is emitted by an excited sodium atom when it generates a photon?.
The electromagnetic energy emitted by an excited sodium atom is 3.47 x 10¯¹⁹ joules.
We need to know about electromagnetic energy to solve the problem. The electromagnetic energy of radiated photons can be calculated by wavelength. It can be determined as
E = h . c / λ
where E is energy, h is Max Planck's constant (6.6 x 10¯³⁴ Js), c is the speed of light (3 x 10⁸ m/s) and λ is the wavelength.
From the question above, the given parameter is
λ = 570 nm = 570 x 10¯⁹ m
By using the equation, we can calculate the energy generated from an sodium atom
E = h . c / λ
E = 6.6 x 10¯³⁴ . 3 x 10⁸ / 570 x 10¯⁹
E = 3.47 x 10¯¹⁹ joules
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A car is traveling at vx= 20 m/s . the driver apples brakes and the car slows down at ax=-4.0 m/s^2 what is the stopping distance?
The stopping distance for a car traveling at a velocity of 20 m/s and acceleration of -4 m/s^2 is 50 m.
The above situation is a case of motion in one dimension, which is governed by the following equations,
V = u + at ..........(i)
V^2 - u^2 = 2as ..........(ii)
S = ut + 1/2 at^2 .........(iii)
As we are given the initial velocity, the final velocity, and the acceleration, therefore we have to apply the second equation to get the answer
v^2 - u^2 = 2as
Here v is the final velocity = 0 m/s
u is the initial velocity = 20 m/s
a is the acceleration = -4 m/s^2
And s is the distance traveled by car
Putting the given values in the above equation,
(0) ^2 - (20)^2 = 2(-4)s
-400 = -8s
S = 50 m
Hence, The stopping distance for a car traveling at a velocity of 20 m/s and acceleration of -4 m/s^2 is 50 m.
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Can someone help me on number 4
Do the following operations. Give your answer to the correct number of sig. figures.
2 m + 9.35 m + 8.6 m
The addition operation of the given figures is determined as 19.95 m in 4 significant figure.
What is significant figure?A significant figure is a figure or a digit that contributes to how accurately something can be measured.
The given values;
2 m ------> 1 significant figure
9.35 m ---------> 3 significant figure
8.6 m -------------> 2 significant figure
Perform addition operation in the given digitsAddition operator in mathematics is denoted by the symbol "+" and it implies summing the giving digits together.
2 m + 9.35 m + 8.6 m = 19.95 m (4 significant figure).
Thus, the addition operation of the given figures is determined as 19.95 m in 4 significant figure.
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An aqueous solution with a ph of 2.00 is diluted from 1.0 l to 3.0 l. what is the ph of the diluted solution?
The aqueous solution with a ph of 2.00 is diluted from 1.0 l to 3.0 l.The ph of the diluted solution will be 2.48.
The pH serves as a gauge for a solution's acidity or alkalinity, as well as its hydrogen ion concentration. The pH scale typically ranges from 0 to 14. Acidic aqueous solutions at 25 °C are those with a pH below 7, and basic or alkaline solutions are those with a pH above 7.
Anything that is acidic is below 7.0, while everything that is alkaline or basic is above 7.0. A pH scale that lists the pH values of common substances and ranges from 0 (extremely basic/alkaline) to 14 (very basic/alkaline).
A solution's pH is a significant indicator of its chemical composition. The pH can affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.
Aqueous solutions are made up of water and one or more dissolved materials. Solids, gases, or other liquids can all dissolve in an aqueous solution.
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A force of 8 lb8 lb is required to keep a spring compressed to 13 ft13 ft shorter than its equilibrium length. what is its spring constant? =k= lb/ft
By using Hooke's Law, the spring constant is 0.62 lb/ft.
We need to know about Hooke's Law to solve this problem. Hooke's Law describes the force applied to spring (elastic materials) will proportional to spring constant and displacement under the elastic condition. It can be described as
F = k . x
where F is force, k is spring constant and x is displacement.
From the question above, we know that
F = 8 lb
x = 13 ft
By substituting the given parameters, we get
F = k . x
8 = k . 13
k = 8/13
k = 0.62 lb/ft
Hence, the spring constant is 0.62 lb/ft.
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A tennis ball with a speed of 20.6 m/s is
moving perpendicular to a wall. After striking
the wall, the ball rebounds in the opposite
direction with a speed of 11.948 m/s.
If the ball is in contact with the wall for
0.0082 s, what is the average acceleration of
the ball while it is in contact with the wall?
Take "toward the wall" to be the positive
direction.
Answer in units of m/s².
hig
ate
6
wa
W
ve
The average acceleration of the ball, while it is in contact with the wall, is -3969.27 m/s².
Acceleration is the rate of change of velocity per unit of time. Its S.I. unit is m/s². It is equal to the change in velocity divided by the time taken to change the velocity.
Acceleration a = Change in velocity/ Time taken
Given in the question
Initial Velocity = u = + 20.6 m/s ( towards the wall is positive direction )
Final Velocity = v = - 11.948 m/s (away from the wall is negative direction)
Change in Velocity = Final Velocity - Initial Velocity
= (- 11.948) - ( + 20.6)
= -11.948 - 20.6
= -32.548 m/s
So Change in velocity = 32.548 m/s
Time Taken = Time of contact with the wall
= 0.0082 seconds
Put in the Formula: a = Change in velocity/ Time taken
a = -32.548/0.0082
a = -3969.27 m/s²
Therefore the average acceleration of the ball, while it is in contact with the wall, is -3969.27 m/s².
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Why must you calibrate your micropipette with oleic acid solution and not with water?
The reason why the micropipette must be calibrated with oleic acid solution and not with water is that Oleic acid can spread out unlike water. Hence, the drop volume will be different skewing the volume.
Oleic acid does have the characteristic of spreading out across a monolayer with a measurable thickness. Water, on the contrary hand, contains a variety of drop sizes, which skews the volume and thus affects the calibration. Because of this, oleic acid is recommended.
Water repels the non-polar chain (it is hydrophobic), while water attracts the polar end (hydrophilic). A very dilute oleic acid solution in pentane shall be used. The pentane evaporates quickly, leaving behind a thin layer of plain oleic acid.
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What wavelength photons are needed to produce 30.0-kev electrons in compton scattering?
We need photons of wavelength 0.0177 nm
When photons interact with matter, there are four competing processes. Compton scattering is one of them.
A photon can be completely absorbed, and its energy can eject an electron from its host atom at energies of a few eV to a few keV, which correspond to visible light through soft X-rays. This phenomenon is known as the photoelectric effect.
Who made the Compton effect famous?The Compton effect was discovered by Arthur Compton.
What does the Compton effect mean?The Compton effect is the lengthening of electron-scattered X-ray and other electromagnetic wave wavelengths. It is the fundamental process by which matter absorbs radiating energy.
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When burned with just the stoichiometric amount of air, under conditions where no heat is lost, will produce flames at what temperature range? group of answer choices
When burned with just the stoichiometric amount of air, under conditions where no heat is lost, the temperature range in which it will produce flames is around 2100 K to 2300 K.
Stoichiometric combustion, in which all available oxygen is fully used, is burning without excess or lack of air. The general equation of a stoichiometric combustion can be determined by presuming that nitrogen reacts in extremely small amounts and is discovered after combustion in molecule form.
Stoichiometric or theoretical air is the smallest amount of air required for a fuel to burn completely. Stoichiometric combustion theoretically gives the ideal fuel to air ratio, which reduces losses and gets all of the energy from the fuel; but, in practice, stoichiometric combustion is not possible due to a variety of different variables.
Since heat losses are unavoidable, 100% efficiency is not possible.
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Is it correct to say that, if no net impulse is exerted on a system, then no change in the momentum of the system will occur?.
Yes, it is correct to say that if no net impulse is exerted on a system, then no change in the momentum of the system will occur.
Impulse is defined as the instantaneous force applied to the object for a very short duration. It is given by the product of force and time. The expression of the impulse is given by
I = F × t where ,
F is the force
t is the time
The impulse is also defined as the change in the momentum of the object, that is,
[tex]I=Pf-Pi[/tex] where [tex]Pf[/tex] is the final momentum of the object [tex]Pi[/tex] is the initial momentum of the object
Hence, if the net impulse is zero, therefore
0=[tex]Pf[/tex]=[tex]Pi[/tex]
[tex]Pf[/tex]=[tex]Pi[/tex]
hence the momentum of the object will also not change.
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A diode hasiso=10 fa and a built-in voltage of 0.8 v. what isisfor a reverse biasof 10 v?
A diode that has the iso=10 fa and a built-in voltage of 0.8 v, its reverse basis for 10v is 36.7fA
What does a diode do?As rectifiers, signal limiters, voltage regulators, switches, signal modulators, signal mixers, signal demodulators, and oscillators, diodes are a versatile electrical component.
A diode’s propensity to transmit electric current solely in one direction is its fundamental characteristic.
What are diodes and their types?An electrical device with two terminals is a diode. A semiconductor, most frequently silicon but occasionally germanium, is used to create diodes.
There are many different kinds of diodes, but the ones being addressed here include the silicon-controlled rectifier, TRIAC, transient voltage suppressor, Zener, rectifier, and Schottky diodes.
What is the diode’s operating principle?A diode’s most frequent use is to permit an electric current to flow in one direction while blocking it in another. This is known as the diode’s forward direction.
It is provided that
Vr = 10V
ϕj = 0.8 V
Iso = 10fA
The reverse current Is
Is = Iso sqrt [1 + Vr/ϕj] → 1
Substituting all the values provided in question to equation 1, we have
Is = 10fA sqrt (1+10/0.8)
=(10fA) sqrt (13.5)
= 36.7fA
Thus Is = 36.7fA
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A watercraft with an initial velocity of 6.4 m/s [e] undergoes an average acceleration of 2.0 m/s2 [s] for 2.5 s. what is the final velocity of the watercraft?
The watercraft with an initial velocity of 6.4 m/s and an average acceleration of 2.0 m/s2 [s] for 2.5 s will have a final velocity of: 11.4 m/s
The formula for Uniformly varied rectilinear motion (UVRM) and procedure we will use to solve this exercise is:
vf = vi + (a* t)
Where:
vf = final velocityvi = initial velocityt = timea = accelerationInformation about the problem:
vi= 6.4 m/sa= 2.0 m/s²t = 2.5 svf = ?Applying the final velocity formula, we have:
vf = vi + (a* t)
vf = 6.4 m/s + (2.0 m/s²* 2.5 s)
vf = 6.4 m/s + 5 m/s
vf = 11.4 m/s
What is acceleration?It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2
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A cylinder initially contains a liquid-vapor mixture of water. water has a total mass of 10 kg and a quality facor of:________
A cylinder initially contains a liquid-vapor mixture of water. water has a total mass of 10 kg and a quality factor of x1= 0.8.
Numerous variables, including the quantity of salt (or salinity), bacteria levels, dissolved oxygen concentrations, and the number of debris suspended in the water, are used to determine the quality of water (turbidity). The individual index values of some or all of the parameters within the five categories of water quality parameters are averaged to create the WQI. Turbidity (NTU*) of the water and/or Secchi disk depth (in meters or feet); Oxygen that has been dissolved: Oxygen concentration in milliliters. They consist of nutrients, pH, temperature, salinity, and dissolved oxygen (nitrogen and phosphorus). One of the most crucial elements of water management is the assessment and management of water quality. With increasing worries and understanding about the effects on the environment and public health, this has gained substantial worldwide significance throughout time.
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A slice of cheese has a mass of 44 g and a volume of 33 cm3. what is the density of the cheese in units of g/cm3 and g/ml?
The density of cheese is 1.33 g/cm³ or 1.33 g/mL.
We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as
ρ = m / V
where ρ is density, m is mass and V is volume
From the question above, we know that
m = 44 g
V = 33 cm³
As we know that 1 cm³ is equal to 1 ml, hence the answer will be the same.
By substituting the following parameters, we get
ρ = m / V
ρ = 44 / 33
ρ = 4/3
ρ = 1.33 g/cm³
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PLEASE HELP ME WITH THIS!!
starting from one shore you row a boat across a narrow river to the other shore. the river is 30.0 m wide as u row the river current moves your boat down the river a distance of 15.0 m what is the resultant displacement of your boat? express your answer in components, and then determine the magnitude
The magnitude of the resultant displacement of your boat will be 33.5 m
What is Displacement ?Displacement is the distance travelled in a specific direction. It is a vector quantity and it is measured in meter.
If starting from one shore you row a boat across a narrow river to the other shore. the river is 30.0 m wide as u row the river current moves your boat down the river a distance of 15.0 m
The resultant displacement of your boat can be calculated by using Pythagoras theorem.
The horizontal component = 15 m, while the vertical component = 30 m
The magnitude of the resultant displacement D = √(x² + y²)
D = √(15² + 30²)
D = √(225 + 900)
D = √1125
D = 33.5 m
Therefore, the magnitude of the resultant displacement of your boat will be 33.5 m
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