could any of you please help i really need it
Answer: B is insulating and A is conducting
Explanation:
I really hope that's right. If not, I am so sorry.
A current of O.S.A flows in a circuit with resistance 60 calculate the potential difference of the circuit
Therefore, the potential difference of the circuit is 30 volts.
What in electricity is a potential difference?The external effort required to move a charge from one position to another in an electric field is known as an electric potential difference, or voltage. A test charge that has an electric potential differential of +1 will experience a shift in potential energy.
To calculate the potential difference (V) of the circuit, we can use Ohm's Law, which states that V = IR, where I is the current flowing through the circuit and R is the resistance of the circuit.
In this case, the current (I) is given as 0.5 A and the resistance (R) is given as 60 Ω. Therefore, we can substitute these values into Ohm's Law to find the potential difference:
V = IR
V = 0.5 A × 60 Ω
V = 30 volts
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Compare the empirical equation from y=9.8x to V= gT + V0 to determine g and V0
Answer:
Explanation:
The empirical equation y = 9.8x represents the relationship between the displacement y of an object and the time x it has been falling under the influence of gravity.
On the other hand, the equation V = gT + V0 represents the relationship between the velocity V of an object, the time T, the initial velocity V0, and the acceleration due to gravity g.
To compare the two equations, we can equate the displacement y in the first equation with the expression for displacement in terms of velocity and time, which is y = (1/2)gt^2 + V0t, where t is the time.
Substituting this into the empirical equation, we get:
9.8x = (1/2)gt^2 + V0t
We can see that this equation has three variables: g, V0, and t. We can't determine all three variables from this equation alone.
However, if we know the time it takes for an object to fall a certain distance, we can use this equation to solve for g and V0. For example, if we know that an object falls 1 meter in 0.45 seconds, we can substitute x=1 and t=0.45 into the equation:
9.8(1) = (1/2)g(0.45)^2 + V0(0.45)
Simplifying this equation, we get:
g = 19.62 m/s^2
V0 = 0.45(9.8) = 4.41 m/s
So the acceleration due to gravity is 19.62 m/s^2 and the initial velocity is 4.41 m/s. Note that these values may not be exactly equal to the true values, as the empirical equation y=9.8x is only an approximation and there may be other factors affecting the motion of the object.
You leave Fort worth ,Texas,at 2:41 p.m. and arrive in Dallas at 3:23 p.m. , covering a distance of 58km. what is your average speed in metres per second ?
Answer:
Explanation:
The time taken to travel from Fort Worth to Dallas is:
t = 3:23 pm - 2:41 pm = 42 minutes = 0.7 hours
The distance covered is:
d = 58 km
The average speed is:
v = d/t = 58 km / 0.7 hours = 82.86 km/h
To convert km/h to m/s, we can use the conversion factor:
1 km/h = 0.2778 m/s
Therefore, the average speed in m/s is:
v = 82.86 km/h × 0.2778 m/s/km = 23.06 m/s (rounded to two decimal places)
So the average speed is 23.06 m/s.
HELP
Complete the ray diagram below:
The image characteristics are ____. (2 points)
A concave mirror is shown with curvature positioned at 8 on a ruler that goes from 0 to 14 centimeters. The object is located at 5, and the focal point is located at 6.5.
upright, virtual, and smaller
upright, real, and same size
inverted, virtual, and smaller
inverted, real, and same size
Real, inverted, and same size are the features of the image. when A concave mirror with a curvature of 8 is displayed on a ruler with a range of 0 to 14 cm.
The mirror formula may be used to calculate the image distance for an item located 4 cm from a 1.5 cm focal length mirror.
1/f = 1/u+1/v
f is the focal length
u is the object distance
v is the image distance
Keep in mind that the concave mirror's image distance and focal length are both positive.
Given:
u = 4cm
f = 1.5cm
1/v = 1/1.5-1/4
1/v = 0.67-0.25
1/v = 0.42
v = 1/0.42
v = 2.38cm
The picture is Genuine and INVERTED since the image distance value is positive.
We shall find its magnification and see if it is magnified or lessened. It is amplified if the magnification is larger than 1, and it is decreased if it is less.
Magnification = v/u
Magnification = 2.38/4
Magnification = 0.595 or. 0.6
The picture is reduced in size since the magnification is less than one (SMALLER).
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What was the angle of application of the force of 35 if on a distance of 15 the work of 350 was done?
Find the density of seawater at a depth where
I the pressure atm
at the
the
surface is 1050 kg/m³. Seawater has a bulk
modulus of 2.3 x 10° N/m². Bulk modulus is
defined to be
B =
Po AP
Ap
Answer:
To find the density of seawater at a certain depth, we need to use the following equation:
P = P0 + ρgh
where:
P0 = pressure at the surface (given as 1 atm = 101325 Pa)
ρ = density of seawater at the depth we're interested in
g = acceleration due to gravity (9.81 m/s^2)
h = depth below the surface
We also need to use the bulk modulus equation to find the change in pressure with depth:
B = (ρ/ρ0)(P-P0)/P
where:
ρ0 = density of seawater at the surface (given as 1050 kg/m^3)
P = pressure at the depth we're interested in
Combining these two equations, we get:
B = (ρ/ρ0)((P0 + ρgh) - P0)/P
B = ρgh/P
ρ = (BP)/(gh)
Substituting the given values, we get:
ρ = (2.3 x 10^9 N/m^2)(101325 Pa)/(9.81 m/s^2)(1050 kg/m^3)(1 atm)
ρ ≈ 1031.4 kg/m^3
Therefore, the density of seawater at a depth where the pressure is 1 atm and the density at the surface is 1050 kg/m^3 is approximately 1031.4 kg/m^3.
I need help with this question
The Large Hadron Collider is a product of and is used for
A. scientific investigations, technological development.What is Large Hadron ColliderThe Large Hadron Collider (LHC) was designed and built for scientific investigations in the field of particle physics. Its primary purpose is to collide particles at very high energies and observe the resulting interactions to gain insights into the fundamental nature of matter and the universe.
However, the construction and operation of the LHC have also contributed to technological development in fields such as superconductivity, cryogenics, and data processing.
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QUESTION 7
Which of the following statements best summarizes the energy conversion taking place in the every day item shown below? (a flashlight)
a. Chemical energy from the battery is converted to electrical energy in the flashlight.
b. Nuclear energy from the battery is converted to thermal energy that heats up the light.
c. Thermal energy from the battery is converted to electrical energy in the flashlight.
d. Electrical energy from the battery is converted to potential energy.
Answer:
a. Chemical energy from the battery is converted to electrical energy in the flashlight.
Who discovered energy quanta and earned a Nobel Prize in Physics?
Answer: Max Planck
He won the Nobel Prize for Physics in 1918.
Work Energy Theorem QUESTION: A 1200kg automobile is moving at 25m/s along level ground. What is the initial KE of the automobile? What is the final KE of the automobile? What is the change in KE of the automobile?What is the work done?
(a) The initial kinetic energy (KE) of the automobile is 375,000 J
(b) The final KE will also be 375,000 J.
(c) The work done on the automobile is zero
What is the initial kinetic energy?The initial kinetic energy (KE) of the automobile can be found using the formula:
KE = 1/2mv²
where;
m is the mass of the automobile and v is its velocity.KE = 1/2 x 1200 kg x (25 m/s)²
KE = 375,000 J
The final KE of the automobile will be the same as the initial KE if the velocity remains constant. However, if there is a change in velocity, the final KE can be found using the same formula as above.
The change in KE can be found by subtracting the initial KE from the final KE, or by using the work-energy theorem:
ΔKE = W
where;
ΔKE is the change in kinetic energy and W is the work done.Assuming there is no external work done on the automobile, the change in KE will be zero.
Therefore, the final KE will also be 375,000 J.
The work done on the automobile can be found using the work-energy theorem:
W = ΔKE = 0 J (since there is no change in KE)
Therefore, the work done on the automobile is zero.
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2. A point charge of +2 µC is located at the center of a spherical shell of radius 0.20 m that has a charge –2 µC uniformly distributed on its surface. Find the electric field
a) 0.1 m from the center.
b) 0.5 m from the center.
Answer:
Explanation:
Since the spherical shell has a net charge of -2 µC, it will create an electric field outside the shell. Within the shell, the electric field is zero due to symmetry.
a) To find the electric field 0.1 m from the center, we can use Gauss's law and consider a Gaussian surface in the shape of a sphere with a radius of 0.1 m centered at the center of the spherical shell. The electric field at a distance r from the center of the spherical shell is given by:
E = kq / r^2
where k is Coulomb's constant (9.0 x 10^9 N*m^2/C^2) and q is the charge enclosed by the Gaussian surface.
In this case, the charge enclosed by the Gaussian surface is the point charge of +2 µC at the center of the spherical shell. Therefore, we have:
E = kq / r^2 = (9.0 x 10^9 N*m^2/C^2) * (2 x 10^-6 C) / (0.1 m)^2 = 1.8 x 10^6 N/C
So the electric field 0.1 m from the center is 1.8 x 10^6 N/C.
b) To find the electric field 0.5 m from the center, we can again use Gauss's law and consider a Gaussian surface in the shape of a sphere with a radius of 0.5 m centered at the center of the spherical shell. The charge enclosed by this Gaussian surface is the sum of the point charge of +2 µC at the center and the charge of -2 µC on the spherical shell. Therefore, we have:
q_enclosed = q_center + q_shell = 2 x 10^-6 C - 2 x 10^-6 C = 0 C
Since there is no charge enclosed by the Gaussian surface, the electric field at a distance of 0.5 m from the center is zero.
So the electric field 0.5 m from the center is 0 N/C.
A block of mass m1=3.0kg rests on a frictionless horizontal surface. A second block of m2=2.0kg hangs from an ideal cord of negligible mass that runs over an ideal pulley and then is connected to the first block . the blocks are released from rest . determine the displacement of the velocityA block of mass m1=3.0kg rests on a frictionless horizontal surface. A second block of m2=2.0kg hangs from an ideal cord of negligible mass that runs over an ideal pulley and then is connected to the first block . the blocks are released from rest . Determine how far has block 1 moved during the 1.2-s interval?
A) 13.4 m
B) 2.1 m
C) 28.2m
D) 7.6m
The answer is:
D. 7.6m
In deep space, there is very little friction. Once they launch a probe into deep space, where there are no external forces acting on it, scientists shut the probe’s engines off because the scientists want the probe to
stop immediately.
speed up.
slow down.
move at constant velocity.
HELP!!! Which simple machines represent variations of an inclined plane? Select all that apply.
screw
lever
wedge
pulley
wheel and axle
How much heat is necessary to change 10 g of ice at -20°C into water at 10°C?
Answer:
Explanation:
The process can be broken down into two steps:
Heat required to raise the temperature of ice from -20°C to 0°C.
Heat required to melt ice at 0°C and raise the temperature of water from 0°C to 10°C.
Step 1:
The heat required to raise the temperature of ice can be calculated using the specific heat capacity of ice, which is 2.09 J/g°C.
Heat required = mass × specific heat capacity × change in temperature
Heat required = 10 g × 2.09 J/g°C × (0°C - (-20°C))
Heat required = 418 J
Step 2:
The heat required to melt ice and raise the temperature of water can be calculated using the heat of fusion of ice and the specific heat capacity of water.
Heat required to melt ice = mass × heat of fusion of ice
Heat required to melt ice = 10 g × 334 J/g
Heat required to melt ice = 3340 J
Heat required to raise the temperature of water can be calculated using the specific heat capacity of water, which is 4.18 J/g°C.
Heat required = mass × specific heat capacity × change in temperature
Heat required = 10 g × 4.18 J/g°C × (10°C - 0°C)
Heat required = 418 J
Total heat required = Heat required in Step 1 + Heat required to melt ice + Heat required in Step 2
Total heat required = 418 J + 3340 J + 418 J
Total heat required = 4176 J
Therefore, 4176 J of heat is required to change 10 g of ice at -20°C into water at 10°C.
The cross-sectional area of vessel A is 50 cm² and it contains water to a height 30 cm. The vessel B has an area of cross-section of 25 cm². The two vessels are connected with a thin tube as shown in the figure, When the tap is slowly opened, and the water attained an equilibrium in both vessels. The reduction in the potential energy of the water is (Density of water is 1000 kgm-³)
1) 7.5 J
2) 22.5 J
3) 0.75 J
4) 8.5 J
5) 75 J
Please show the working along with a brief explanation.
The reduction in the potential energy of the water is approximately 7.5 J.
option 1
What is the reduction in potential energy?We can use the principle of conservation of energy to determine the reduction in potential energy of the water.
Initially, the water in vessel A has a certain amount of potential energy due to its height above the bottom of the vessel. When the water flows through the tube and reaches vessel B, its height above the bottom of vessel B is lower than that of vessel A, which means that its potential energy has decreased.
The potential energy of the water in vessel A is given by:
PE_A = mgh_A
The mass of the water in vessel A is given by:
m = density x volume
volume = A x h_A
Substituting for m and simplifying, we get:
PE_A = density x A x h_A x g
Similarly, the potential energy of the water in vessel B is:
PE_B = density x A_B x h_B x g
At equilibrium, the height of the water in the two vessels will be the same, so we can set h_A = h_B = h.
Also, since the water is in equilibrium, the pressure at the bottom of both vessels must be the same. This means that the pressure difference between the top and bottom of the water column in vessel A (due to the weight of the water) must be balanced by the pressure difference between the top and bottom of the water column in vessel B.
The pressure difference in vessel A is:
P_A = density x g x h_A
and the pressure difference in vessel B is:
P_B = density x g x h_B
Since the pressure difference must be balanced, we have:
P_A - P_B = density x g x h_A - density x g x h_B = 0
which simplifies to:
h_A = h_B x A_B / A
Substituting for h_A and h_B in the expressions for PE_A and PE_B, we get:
PE_A = density x A x h x g
PE_B = density x A_B x h x g x A / A_B
The reduction in potential energy of the water is:
ΔPE = PE_A - PE_B = density x g x h x (A - A_B x A / A_B)
which simplifies to:
ΔPE = density x g x h x (A - A_B)
Substituting the given values, we get:
ΔPE = 1000 kg/m³ x 9.8 m/s² x 0.3 m x (50 cm² - 25 cm²)
Converting the area units to m², we get:
ΔPE = 1000 kg/m³ x 9.8 m/s² x 0.3 m x (0.005 m² - 0.0025 m²)
Simplifying, we get:
ΔPE = 7.4 J
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What is the maximum allowable conductor temperature insulation rating of an NMWU conductor?
O a. 110°C
O b. 90°C
O c. 60°C
O d. 30°C
A. 90°C, NMWU (Nylon-coated Metal Clad) is a type of electrical wire commonly used in residential and commercial wiring applications.
What is Nylon-coated Metal Clad?It is composed of a metal conductor, such as aluminum or copper, wrapped in a protective layer of nylon. The advantage of this type of wire is that it is easier to work with than other types of wire, is highly resistant to corrosion, and can withstand temperatures up to 90°C.
The insulation rating of a wire is a measure of its ability to withstand heat or cold without being damaged. This rating is determined by the maximum temperature that the insulation can withstand before it begins to degrade or break down. For NMWU wire, the maximum allowable conductor temperature insulation rating is 90°C. Other types of wire may have lower or higher ratings.
The insulation rating of the wire must be taken into account when selecting a wire for an application. If a wire is subjected to temperatures greater than its rated insulation temperature, the insulation can be damaged and the wire may become unsafe.
Therefore, it is important to ensure that the insulation rating of the wire is appropriate for the application. For NMWU wire, the maximum allowable conductor temperature insulation rating is 90°C, so it should only be used in applications.
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At 5220J, a temperature increase occurs from 10 degrees Celsius to 60 degrees Celsius. What is the mass of the water?
The mass of water that undergoes a change in temperature from 10 degrees celsius to 60 degrees celsius is 24.9 g.
What is mass?Mass is the quantity of matter a body contained.
To calculate the mass of the water, we use the formula below
Formula:
m = Q/cΔt................... Equation 1Where:
m = Mass of waterQ = Amount of heatc = Specific heat capacity of waterΔt = Change in temperatureFrom the question,
Given:
Q = 5220 Jc = 4200 J/kg.KΔt = 60-10 = 50 degree celsiusSubstitute these values into equation 1
Q = 5220/(4200×50)Q = 0.0249 kgQ = 24.9 gHence, the mass of water is 24.9 g.
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A student uses 800 W microwave for three seconds how much energy does a student use
Answer:
The student use 2400 Joules
Explanation:
From the formula E = pt
p = 800W
t = 3 seconds
=> E = 800*3 = 2400J
if an 80 kg person is 5 m away from a 100 kg person, what is the force of gravity between them?
The force of gravity between the 80 kg person and the 100 kg person, who are 5 meters apart, is approximately 1.07269 × 10^-6 Newtons.
To find the force of gravity between them?The force of gravity between two objects is given by the formula:
F = G(m1*m2)/r^2
Where
F is the force of gravity G is the gravitational constant (6.67430 × 10^-11 N·(m/kg)^2) m1 and m2 are the masses of the two objectsr is the distance between themPlugging in the given values, we get:
F = 6.67430 × 10^-11 N·(m/kg)^2 * (80 kg) * (100 kg) / (5 m)^2
Simplifying this expression, we get:
F = 1.07269 × 10^-6 N
Therefore, the force of gravity between the 80 kg person and the 100 kg person, who are 5 meters apart, is approximately 1.07269 × 10^-6 Newtons.
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Two spheres of masses 200kg and 100kg respectively have the centres seperated by a distance of 0.5m. Calculade the magnitude of force of attraction between them. G = 6·7x 10" N m² kg - ²
Sound travels through air at a speed of 342m/s
342
m
/
s
at room temperature. What is the frequency of a sound wave with a wavelength of 1.8m
1.8
m
Answer:
Explanation:
The formula relating the speed of sound, frequency, and wavelength is:
speed = frequency x wavelength
Rearranging this formula to solve for frequency:
frequency = speed / wavelength
Substituting the given values:
frequency = 342 m/s / 1.8 m
frequency = 190 Hz
Therefore, the frequency of the sound wave is 190 Hz.
The epicenter of an Earthquake was located 1800 kilometers away. If the S-wave arrived at the seismic station at 10:06:40 am, at what time did the P-wave arrive?
Answer:
The P-wave travels faster than the S-wave and arrives at the seismic station before the S-wave. The time difference between the arrivals of the P-wave and S-wave can be used to determine the distance between the seismic station and the earthquake epicenter.
Explanation:
A Car accelerate Cuniformly from) 13 ms -1 to 31ms-1 while entering the motor way Covering the distance 220m
Answer:
3.84 m/s^2.
Explanation:
To solve this problem, we can use the following kinematic equation:
v^2 = u^2 + 2as
where:
v is the final velocity (31 m/s)
u is the initial velocity (13 m/s)
a is the acceleration (which is assumed to be constant)
s is the distance traveled (220 m)
We want to solve for the acceleration, so we can rearrange the equation as follows:
a = (v^2 - u^2) / 2s
Substituting the given values:
a = (31^2 - 13^2) / (2 x 220)
a = 3.84 m/s^2
Therefore, the acceleration of the car is 3.84 m/s^2.
please rate
A missile weighing 400N on the earth surface is shot into the atmosphere to an altitude of 6.4 x 106 m. Taking the earth as a sphere of radius 6.4 x 10-6 m and assuming the inverse-square law of universal gravitation, what would be the weight of the missile at that altitude?
Answer:
Explanation:
We can use the inverse-square law of universal gravitation to determine the weight of the missile at an altitude of 6.4 x 10^6 m. The law states that the force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Let M be the mass of the Earth and m be the mass of the missile. At the Earth's surface, the weight of the missile is:
F1 = mg
where g is the acceleration due to gravity on the Earth's surface, which we assume to be 9.81 m/s^2.
At an altitude of 6.4 x 10^6 m, the distance between the center of the Earth and the missile is:
r = R + h
where R is the radius of the Earth (6.4 x 10^6 m) and h is the altitude of the missile (6.4 x 10^6 m).
The weight of the missile at this altitude can be calculated using the inverse-square law of universal gravitation:
F2 = G * M * m / r^2
where G is the gravitational constant (6.6743 x 10^-11 N * m^2 / kg^2).
Substituting the given values, we get:
F2 = (6.6743 x 10^-11 N * m^2 / kg^2) * (5.97 x 10^24 kg) * (400 N) / (6.4 x 10^6 m + 6.4 x 10^6 m)^2
F2 = 39.61 N
Therefore, the weight of the missile at an altitude of 6.4 x 10^6 m is approximately 39.61 N.
Which correctly describes a different evolutionary stage of a star like the sun
A) it’s forms from a cold, dusty molecular cloud
B) During a yellow giant stage, it burns carbon in its core and helium in the shell surrounding the core.
C) After leaving the main sequence, its core is stable due to electron degeneracy
D) It becomes a white dwarf after exploding as a supernova
E)During a red giant stage, its core contracts and cools
The statement that correctly defines an evolutionary stage of a star like the sun is that after leaving the main sequence, its core is stable due to electron degeneracy. That is option C.
What are the stage of life cycle of a star?The stages of the life cycle of a star include the following:
Giant Gas CloudProtostarT-Tauri PhaseMain SequenceRed GiantThe Fusion of Heavier ElementsSupernovae and Planetary NebulaeThe evolutionary stage is also called the main sequence stage of the life cycle of the star.
In this stage, the core temperature reaches the point for the fusion to occur whereby the protons of hydrogen are converted into atoms of helium. This leads to the stability of the core of the newly formed start due to electron degeneracy.
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Work Energy Theorem Question:: A 0.0025 kg bullet traveling straight horizontally at 350 m/s hits a tree and slows uniformly to a stop while penetrating a distance of 0.12 m into the tree’s trunk. What is the initial KE of the bullet? What is the final KE of the bullet? What the the change in KE of the bullet? What is the force exerted?
What is Albert Einstein theory?
Albert Einstein was a German-born theoretical physicist who developed the theory of general relativity, effecting a revolution in physics.
Where is the contradiction between quantum physics and Einstein’s gravity?Rμν−12gμνR=8πGT^μν.
This is Einstein’s field equation. Essentially, this equation is general relativity. The left-hand side represents the geometry of spacetime. The right-hand side, the energy, momentum, and stresses of matter.
What this equation describes, in the words of Wheeler, is this: Spacetime tells matter how to move; matter tells spacetime how to curve.
But look closely. That T
on the right-hand side. It has a hat.
It has a hat because it is a quantum-mechanical operator. Because we know that matter consists of quantum fields. So it is described by operator-valued quantities (Dirac called them q-numbers). They are unlike ordinary numbers. For instance, when you multiply them, the order in which they appear matters. That is, when you have two operators p^
and q^
, p^q^≠q^p^
most of the time. So they are definitely not like numbers.
When Einstein wrote down his field equation over 100 years ago, the T
did not have a hat. But that’s because they didn’t know about operator-valued quantities at the time. Now we do. So I have to put the hat there.
But there are no hats on the left-hand side. And because of that, my equation might as well say something like, some apples = some oranges. It makes no sense. The stuff on the left-hand side (which consists of numbers) can never equal the stuff on the right-hand side (which definitely does not consist of numbers.)
I can make it work, though. I can replace that operator with its so-called expectation value:
Rμν−12gμνR=8πG⟨Tμν⟩.
This is called semiclassical gravity. And it works well, very well indeed. A little too well, as a matter of fact. Gravity is so weak, quantum effects are so irrelevant, this equation accurately describes Nature everywhere we can look. But we still don’t like it, because using that expectation value trick is a cheat, a cop-out.
Now you might wonder, why don’t I put hats on top of the things on the left-hand side? I would… if I knew how to quantize spacetime. That is, how to turn the numbers that describe gravity into quantum-mechanical operators.
But I do not. And nobody does. The standard methods all fail, leading to equations that make no sense at all.
So we are kind of stuck… we don’t know how to quantize gravity, and our observations don’t help us, don’t offer any hints as to how to get beyond semiclassical gravity. Theorists keep trying to come up with new ideas (or recycle old ones) but basically, we’ve been pretty much just spinning our wheels for decades.
The bigger the spring constant, the more__________the spring is.
The bigger the spring constant, the more stiff or rigid the spring is.
What does it signify when a spring's spring constant is higher?The exact amount of force needed to bend a spring depends on the spring constant. Although pounds/inch is a common measurement in North America, the standard international (SI) unit for spring constants is Newtons/meter. A stiffer spring has a greater spring constant, and vice versa.
What does it signify when the spring constant is higher?The exact amount of force needed to bend a spring depends on the spring constant. Although pounds/inch is a common measurement in North America, the standard international (SI) unit for spring constants is Newtons/meter. A stiffer spring has a greater spring constant, and vice versa.
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