Answer:
Forces have magnitude and direction.
Explanation:
Force is a vector quantity.
Friction is a force caused by the contact of one surface on another.
a. true
b. false
Friction is a force caused by the contact of one surface on another: a. true
The Friction force is the force that opposes the displacement of an object or body on a contact surface. The greater the opposition the contact surface exerts on the displacement of an object, the greater the frictional force.
The general formula for the friction force is:
Fr = μ * N * Uv
Where:
Fr= Frictional forceμ= Friction coefficient. It is a dimensionless value that depends on the nature and treatment of the substances in contact.N= Modulus of the normal force.Uv = Unit vector in the direction and sense of the velocity vector.What is force?It is the physical magnitude that expresses the effort necessary to move the mass of one kilogram with an acceleration of one meter per second squared, this is expressed in units of the international system in Newton.
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Compare collinear points and coplanar points- ar ecollinear points also coplanar?
The collinear points are also known as coplanar but coplanar cannot be collinear all the time.
What is collinear points and coplanar points?The difference between Collinear Points and Coplanar Points is that the former a states that if three or more points lies in a straight line and a line on which the points lie, especially if it is related to a geometric figure such as triangle, is also called an axis while the latter are simply the same as the meaning of the Collinear but lies on the same plane.
Collinear points lie on the same line and Coplanar points also lies in the same plane.
For example, we have a image which has 3 points A, B and C on the plane M. Those points and plane lies on the same line. So, that it can be known as collinear and coplanar.
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A ground state hydrogen atom absorbs a photon of light having a wavelength of 92.27 nm. it then gives off a photon having a wavelength of 383.4 nm. what is the final state of the hydrogen atom?
Absorption or emission lines for hydrogen occur when electrons change energy levels. These correspond to specific wavelengths and can be calculated by using:
1/λ = RH (1/n^2f - 1/n^2)
RH = 1.09737×10^7m^−1 is the Rydberg constant
For the 92.97 absorption, initial=1, solve for final
1/92.92×10^-9=R(1/1^2 - 1/final^2)
(1/92.97×10^-9)*(1/1.096775×10^7)=1/1^2 - 1/final^2
final=8
When 384.3 wavelength is released n=8 will be initial level. Solve for final level.
-1/383.4×10^-9=R(1/8^2 - 1/final^2)
(-1/383.4×10^-9)*(1/1.096775×10^7)=1/8^2 - 1/final^2
final = 2
When n = 2 the electron will land at that level.
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In diving to a depth of 374 m, an elephant seal also moves 311 m due east of his starting point. what is the magnitude of the seal's displacement?
The magnitude of the seal's displacement will be 486.41m
What is the concept of displacement?There are an endless number of paths that can be built between two places. The distance is the name given to any specific length of path. There is a path with the shortest distance out of all of these, and the length of that path is determined by the size of a properly specified vector quantity called the displacement.
Given that an elephant seal goes 311 m to the east of his starting location when diving to a depth of 374 m.
Allow the seal to begin at point A and dive deep to reach position B. In the illustration below, his displacement is highlighted in red:
The hypotenuse of the right triangle ABC can be located to determine the displacement's magnitude.
We discover:
displacement of the seal = [tex]\sqrt374^{2} +311^{2} = 486.41m[/tex]
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Measuring human impact and comparing it with the biophysical world's carrying capacity is known as:________-
Measuring human impact and comparing it with the biophysical world's carrying capacity is known as Ecological footprint.
What is Ecological footprint?
The Global Footprint Network promotes the ecological footprint as a way to assess how much nature is needed to sustain a certain number of people or an economy. Through an ecological accounting system, it monitors this demand. The accounts compare the biologically productive areas used by people for consumption to the biologically productive areas available in a region or throughout the world (biocapacity, the productive area that can regenerate what people demand from nature). It measures the effects of humans on the environment, to put it briefly.
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A test rocket at ground level is fired straight up from rest with a net upward acceleration of 20 m/s2. After 4.0 s, the motor turns off, but the rocket continues to coast upward with insignificant air resistance. What maximum elevation does the rocket reach?
The maximum elevation the rocket will reach is 160 m.
Maximum height attained by the rocketThe maximum height reached by the rocket is calculated as follows;
h = vt + ¹/₂at²
where;
v is the initial velocity of the rocket = 0t is the time of motiona is the acceleration of the rocketsubstitute the given parameters and solve for maximum height.
h = 0 + ¹/₂(20)(4)²
h = 160 m
Thus, the maximum elevation the rocket will reach is 160 m.
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The force experienced by a unit test charge is a measure of the strength of an electric:
-zone
-field
-sphere
-sector
Answer:
the answer should be field.
Due to radiation and absorption, what is the maximum flame temperature in a fire?
The maximum flame temperature in a fire is 1500-1600K due to radiation and absorption.
What do you mean by radiation and absorption?In physics, matter (usually electrons bound in atoms) absorbs electromagnetic radiation in order to convert the energy of a photon into the internal energy of the absorber (for example, thermal energy). Attenuation, or the steady decrease in light wave intensity as it travels through a medium, is a prominent effect. In some circumstances (optics), the medium's transparency changes by a factor that varies as a function of wave intensity, leading to saturable absorption (or nonlinear absorption), even though the absorption of waves typically does not depend on their intensity (linear absorption).
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Materials whose constituent particles are bound by which type of bond are generally expected to have the lowest melting temperatures?
Materials whose constituent particles are bound by Vander waal's type of bond are generally expected to have the lowest melting temperatures
What is Vander waal's interaction ?When two atoms are close enough to each other that their outer electron clouds just barely contact, van der Waals interactions take place. This causes charge oscillations that produce a unidirectional, nonspecific attraction.
Hydrogen bonding, dispersion forces, and dipole-dipole interactions are examples of van der Waals forces.Van der Waals forces come in three different flavours: dispersion (weak), dipole-dipole (medium), and hydrogen (strong). Polar molecules and ions join together to produce ion-dipole bonds, which connect ionic species to covalent molecules. Usually, these chemicals form medium- to strong-bonding structures.Learn more about Van der Waals forces here:
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A glass tube (open at both ends) of length l is positioned near an audio speaker of frequency f 5 680 hz. for what values of l will the tube resonate with the speaker?
The lowest possible value of the length
L1 = 0.25m
- Second lowest possible value
L2 = 0.45m
- Third lowest possible value
L3 = 0.75
CalculationBefore calculating the length of the resonance tube, we have to first know the wavelength produced by the wave.
Using the expression
v = Foλ
V is the velocity of wave
Fo is the resonance frequency
λ is the wavelength
From the formula,
λ = v/Fo
λ = 343/680
λ = 0.50m
For an open pipe, the first resonant length L1 = λ/2
Second resonant length L2= λ
Third resonant length L3 = 3λ/2
The lowest possible value of the length L1 = 0.50/2
L1 = 0.25m
Second lowest possible value
L2 = 0.50m
Third lowest possible value
L3 = 3(0.50)/2
L3 = 0.75m
Hence, for values of 0.25,0.50 and 0.75, the tube resonates with the speaker.
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Determine the tension developed in the cable ab required to support the traffic light, which has a mass of 25 kg . take h = 3.5 m.
The tension developed in the cable is 245.25 N.
What is tension Force?In physics, tension is defined as the pulling force transmitted axially by a string, cable, chain, or other similar object, or by either end of a rod, truss member, or other comparable three-dimensional object.
Tension can also be thought of as the action-reaction pair of forces acting at each end of the aforementioned elements. The polar opposite of compression might be tension.
CalculationOnly two forces act on the traffic light: the tension T of the cable (upward) and the weight of the traffic light (downward).
The weight is mg = 25 x 9.81 = 245.25 N
If the traffic light is at equilibrium, the resultant of the two forces must be equal to zero (Newton's second law):
T - mg = 0
Therefore, the tension of the cable is.
T = mg = 245.25 N
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A copper wire has a diameter of 1.572 mm. what magnitude current flows when the drift velocity is 2.29 mm/s? take the density of copper to be 8.92 103 kg/m3.
By using the drift velocity of the electron, the current flow is 6.02 ampere.
We need to know about drift velocity of electrons to solve this problem. The drift velocity can be determined as
v = I / (n . A . q)
where v is drift velocity, I is current, n is atom number density, A is surface area and q is the charge.
From the question above, we know that
d = 1.572 mm
r = (0.001572 / 2) m
v = 2.29 mm/s = 0.00229 m/s
ρ = 8.92 x 10³ kg/m³
q = e = 1.6 x 10¯¹⁹C
Find the atom density
n = Na x ρ / Mr
where Na is Avogadro's number (6.022 x 10²³), Mr is the atomic weight of copper (63.5 g/mol = 0.635 kg/mol).
n = 6.022 x 10²³ x 8.92 x 10³ / 0.635
n = 8.46 x 10²⁷ /m³
Find the current flows
v = I / (n . A . q)
0.00229 = I / (8.46 x 10²⁷ . πr² . 1.6 x 10¯¹⁹)
0.00229 = I / (8.46 x 10²⁷ . π(0.001572 / 2)² . 1.6 x 10¯¹⁹)
I = 6.02 ampere
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What do you think will be the pressure result of the current experimental conditions?
Pressure above the left beaker the pressure outcome of the current experimental circumstances.
What do u mean by pressure?Either the action of pressing or the state of pressing. A strain or force exerted against resistance in any direction. Force per unit of area is a measure of force exerted uniformly over a surface.
Pressure is the ratio of the force applied perpendicularly to an object's surface to its area. Its abbreviation is "p" or "P."
The force applied by one region of a gas, liquid, or solid to another, expressed as a function of area. A substance is said to have negative pressure if another substance exerts greater force per unit area on it than it does on it. Pressure is commonly measured in Pascal units, atmospheres, or pounds per square inch. Its value is just the opposite of the pressure the other substance is exerting.
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A battery is discharging. electric current exits the battery through the ______ terminal, at a ______ potential than when it entered
When a battery discharges the current exits through the positive terminal at a higher potential than it entered.
When a battery discharges the current exits the battery through the positive terminal as a circuit connected to that should conduct current from positive to a negative potential.Accordingly, the current enters the battery at its negative terminal.In practicality, batteries contain some internal resistance that restricts the current flow during current flow.That is why there is a potential difference between the 2 terminals.To drive the current through the external circuit connected to the battery, it keeps a higher potential at its positive terminal while the negative terminal is kept at a lower potential in contrast.#SPJ4
What are some of the limitations of this two-dimensional model of electric fields?
Some limitation of this two-dimensional model of electric fields are
Vectors can only be shown from one particle to another, but we don't see that in this model. We cannot see the object in the "z" direction as we could if it were a three-dimensional model.The direction of the field is taken to be the direction of the force it would exert on a positive test charge.The electric field is radially outward from a positive charge and radially inwards in a negative point charge i.e. not restricted to only two directions.Electric field is the electrical property associated with each point in space when charge in any form is present.
Three dimensional model must be used to find electric field of a particle as it is easy to understand and also provides clear visualization.
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The mass of an apple was 84.0 g.
The volume of the apple was 120 cm³.
Calculate the density of the apple.
Give your answer in g/cm³.
CS
A bicyclist steadily speeds up from rest to 9.00m/s in 3.10s.
How far did she travel during this time?
unit
Three identical capacitors are connected in parallel to a potential source (battery). if a charge of q flows into this combination, how much charge does each capacitor carry?
Each capacitor carries a charge of 1/3q as they are identical.
These capacitors are identical and the combination is connected in parallel to each other.So each should receive an equal portion of the total charge when received from the power source.If the combination is connected in series to each other, then each one would receive the same amount of charge, not a portion of the total charge (in such a case the total charge would be 3q).To know this more precisely, consider the simple formula used for a capacitor: [tex]Q = CV[/tex].In a parallel arrangement, the potential is the same for each one and since the capacitance is equal, the charge one would carry is the same as well.Then the total charge [tex]q[/tex] is the sum of each capacitor's charge which yields [tex]q = 3Q\,\,\to\,\,Q = \frac{q}{3}[/tex] .#SPJ4
An object is pulled northward with a force of 10 n and southward with a force of 15 n. the magnitude of the net force on the object is:________
a. 0 n.
b. 5 n.
c. 10 n.
d. 15 n.
The correct option is (b) 5n
As a result, there is a net downward force of 5N operating on the object.
The resultant force is the force that results from adding the vector sums of all the forces operating on an item. The combined action of all the acting forces on the object produces the same effect as the resulting force. When determining the resulting force, the direction of the forces must be taken into account.
Given;
The northward force is Fn = 10N
The southward force is Fs = 15N
Required;
The net force on the mobile phone is Fnet = ?N
The object's weight exerts downward pressure, and upward resistance exerts upward pressure. The vector sum of these two forces will be the net force.
Fnet = Fs - Fn (Considering the direction downward as positive)
Fnet= 15N - 10N
Fnet = 5N
As a result, there is a net downward force of 5 N operating on the object.
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Suppose you add two vectors a and b. what angle between them produces the result with the greatest magnitude?
The angle to find the magnitude of the resultant force of two vectors 90 DEG.
What is magnitude?Greatness by and large alludes to the amount or distance. According to the development, we can associate extent with the size and speed of the article while voyaging. The size of the item or the sum is its greatness. Like in the event of speed, a vehicle is voyaging quicker than a motorbike. Size alludes to the evaluating of the splendor of stars, the first being the most brilliant. It has been moved to different issues since basically the seventeenth century. Magnitude for the most part alludes to the amount or distance. Corresponding to the development, we can connect greatness with the size and speed of the item while voyaging. The size of the item or the sum is its greatness. Like in the event of speed, a vehicle is voyaging quicker than a motorbike.
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True or false kinetic energy is the energy associated with its position or composistion
Kinetic energy is not the energy associated with its position or composition.
Energy is the crucial for sustenance of every being. The potential energy is present in every object and cannot be given to another object. Explosives contain the chemical potential energy that is released as kinetic energy and heat after ignition.
What is the kinetic energy?Kinetic energy is not energy associated with the position or composition. It is the energy related with the motion.
The total energy of the universe is a constant as energy can be changed from one form to another but cannot be created nor destroyed. Systems changes in order to lower their potential energy. Energy can be changed from one type to the another. Energy is capacity to do work.
Kinetic energy, form of the energy that an object or a particle has by reason of its motion. If the work, which transfers energy, is done on an object by applying net force, the object speeds up and thereby gains kinetic energy. The kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass.
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An electron travels 3.31 m in 5.83 x 10 to the -8 s. How fast is it traveling?
Speed of electron with which it is traveling is
0.56 x 10^8 m/s
It is given that
distance travelled by electron is 3.31 m
time taken to travel = 5.83 x 10^-8 s
We have to find Speed of electron with which it is traveling
Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value.
Speed = distance/time = 3.31/5.83 x 10^-8
Speed = 0.56 x 10^8 m/s
Hence, Speed of electron with which it is traveling is 0.56 x 10^8 m/s
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A solution is prepared by adding 1.43 mol of kcl to 889 g of water. the concentration of kcl is ________ molal.
A solution is prepared by adding 1.43 mol of KCL to 889 g of water. The concentration of KCL is 1.61 molal.
What is molality?Molar concentration, also known as molarity, quantity concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of its volume.
The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution’s concentration is referred to as one molar or 1 M.
Mol of Kcl (potassium chloride) = 1.43
water = 889 g = 0.889kg
Molality = Moles of solute/kilograms of solvent
So, it comes as m = 1.43/0.889 = 1.61 molal
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The amount of voltage induced into a conductor moving in a magnetic field depends on the ______.
A measure of how quickly a conductor moves across a field. The voltage induced increased as the conductor moved through the field more quickly. The induced voltage and speed are directly inversely proportional.
When a conductor is moved in a magnetic field, a voltage will be induced on the conductor.?Current can only flow when a circuit is closed or complete, hence, unless the circuit is completed current will not flow
What is Electro-Magnetic Induction?
This a phenomenon whereby a wound wire or a soft core of conductor made to cut across magnetic line of force and an E.M.F is generated, this E.M.F forces current to flow if the circuit is completed.
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If two insulated wires were to melt together where the copper conductors touched each other, the type of failure would be called a(n) ________.
A short to voltage failure would occur if the copper conductors of two insulated wires came into contact and melted together.
Describe voltage:The difference in electric potential between two points, also known as voltage, electric potential difference, electric pressure, or electric tension, is measured as the amount of work required to move a test charge per unit of energy between the two sites.
What is voltage formula?The formula reads voltage = current x resistance, or V = A x, or volts = amps x ohms.
What different voltages are there?Electrical services are categorized:
Low Voltage: 1000 volts or less.Medium Voltage is defined as much over 1000 volts and under 100 kV.High Voltage is defined as voltages of at least 100 kV but not more than 230 kV.Ultra-High Voltage is defined as 1000 kV or more.To know more about Voltage visit:
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A shopping cart given an initial velocity of 2.0 m/s north undergoes a constant acceleration of 3.0 m/s2 north. what is the distance the cart moved after the first 4.0 s of its motion?
Following the initial 4.0 seconds of travel, the cart moved 32m.
What is an equation of motion?Physicists use equations of motion to describe how a physical system behaves in terms of how its motion changes over time.
The behavior of a physical system is described by the equations of motion in more detail as a collection of mathematical functions expressed in terms of dynamic variables. These variables typically comprise time and spatial coordinates, but they could also have momentum components. The most flexible option is generalized coordinates, which can be any useful variable that is a component of the physical system. In classical mechanics, the functions are defined in a Euclidean space, while curved spaces are used in relativity instead. The equations are the answers to the differential equations describing the motion of the dynamics of the dynamics of a system are known. The amount of motion changes according to the strength of the force and does so in the direction of the force's applied straight line.
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WILL MARK BRAINLIEST 5) A car slams on its breaks and comes to a complete stop over a
distance of 100m. If the car's rate of acceleration was -3.7 m/s², what
is the car's initial speed?
Answer:
27 m/s
Explanation:
Vf = Vo + a t
0 = vo + (-3.7)t
vo = 3.7t use this value in the next equation
Displacement = vo t + 1/2 a t^2
100 = 3.7t^2 + 1/2 (-3.7)(t^2 )
100 = 1.85 t^2 t = 7.352 s
vo= 3.7 t = 3.7 * 7.352 = 27. m/s
A basketball weighs 20. ounces and has a volume of 456 in3. what is the average density of the basketball in g/cm3?
The basketball that 20 ounces and has a volume of 456 in3 has a density of 0.076 g/cm3
The density formula and the procedure we will use is:
ρ = m/v
Where:
v= volumeρ= densitym= massInformation about the problem:
m = 20 oz
v = 456 in3
ρ= ?
By converting the mass from ounces to grams, we get:
20 oz * (28.3495 g / 1 oz) = 566.99 g
By converting the volume from in3 to cm3, we get:
456 in3 * (16.3871 cm3 / 1 in3) = 7472.52 cm3
Applying the density formula, we get:
ρ = m/v
ρ = 566.99 g/ 7472.52 cm3
ρ = 0.076 g/cm3
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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A laser emits light with a frequency of 5.69 x 1014 s-1. the energy of one photon of the radiation from this laser is:_________
A laser emits light with a frequency of 5.69 x 10^14 s-1 then the energy of one photon of the radiation from this laser is 3.7 x 10^(-19).
What is radiation?The energy emission in the form of electromagnetic waves or in the form of moving subatomic particles which are especially high-energy particles which cause ionization is called as the phenomenon of radiation.
Any kind of energy that emanates from a source and moves through space at the speed of light is referred to as radiation. This energy has wave-like qualities and is accompanied by an electric field and a magnetic field.
Here ∨ = 5.69 x 10^(14) s-1
we know E=h∨
where h = 6.626 x 10^(-34) js
putting the value in the formula, we have,
6.626 x 10^(-34) x 5.69 x 10^(-34)
=3.7 x 10^(-19)
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a stick is dropped off a cliff what is the sticks intial velocity? Show work