The thing that happens to a vector when it is multiplied by a negative number that is not equal to negative one is A. only the magnitude changes
What happens if you multiply a vector by a negative number?except that the vector's arrow will point in the other direction when multiplied by a negative integer. A vector, for instance, will become half as long in the same direction when multiplied by 1/2, whereas it will become twice as long but directed when multiplied by 2.
A vector's direction is reversed but the magnitude is left unchanged when multiplied by a negative one. The direction and magnitude of the vector are reversed when multiplied by any other negative quantity.
Therefore, option A is correct.
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When did modern chemistry start
A Method for Calculating the Spring Constant of Atomic Force Microscopy Cantilevers with a Nonrectangular Cross Section
a. true
b. False
False. A Method for Calculating the Spring Constant of Atomic Force Microscopy Cantilevers with a Nonrectangular Cross Section is not a valid statement.
This is because the spring constant is not affected by the shape of the cantilever, but is instead determined by the material used in its construction, the number of coils in its spring, the wire diameter of its spring, and the amount of tension placed on the spring. Therefore, the statement is incorrect and cannot be used to calculate the spring constant of atomic force microscopy cantilevers with a nonrectangular cross section.
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Why dose earth have a liquid water supply and the moon dose not
Answer:
Because that is how God created things
Explanation:
Several motorboats with the same mass are used in an experiment. the forces of the different motors versus their accelerations are graphed. what is the y-intercept of this graph?
The y-intercept of a graph is the point at which the graph crosses the y-axis. In this case, the y-intercept of the graph showing the relationship between the motor's force and the boat's acceleration would represent the force required to produce zero acceleration.
In this scenario of the boats being used in an experiment, if the boats have the same mass and the motors are producing force, and the forces are graphed against the acceleration, this will give us a straight line, and the y-intercept of this graph will be the force required to keep the boat at a zero acceleration, this force is known as "friction force" which includes the friction force of the water and the friction force of the bearings in the motor and other mechanical parts in the boats and motor.
It's worth noting that, in practice, getting the y-intercept in this experiment might be very hard as it's very rare to get zero acceleration. Still, one can aim for the lowest possible acceleration, and the force measured can be considered as an approximation for the friction force.
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Whose findings have the most in common with Roy Kerr’s discovery of how a noncharged, rotating massive object (like a supermassive black hole) affects its gravitational field?
Schwarzschild’s understanding of the ratio of mass to compression size before an object becomes a black hole
Einstein’s theory of relativity that posits that objects can curve the fabric of space
John Michell’s idea that there was an object with an escape velocity greater than the speed of light
Pierre-Simon de LaPlace’s conclusion that light could never escape a body big enough to have a gravitational force greater than the speed of light
The individual whose findings have the most in common with Roy Kerr’s discovery of how a noncharged, rotating massive object (like a supermassive black hole) affects its gravitational field is Einstein’s theory of relativity which posits that objects can curve the fabric of space.
Who was Roy Kerr and what was his discovery?The Kerr geometry, a precise response to the Einstein field equation of general relativity, was discovered by New Zealander mathematician Roy Patrick Kerr. His method simulates the gravitational environment around a huge, rotating, uncharged object, such as a rotating black hole. Before spinning black holes were discovered, his solution to Einstein's equations anticipated their existence.
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Immersion rods for heating liquids are made up of metallic substances.
Metals are good conductors of both heat and electricity, immersion rods are constructed of metallic materials. In order to heat the liquid, electricity is transferred through the immersion rod, which also needs to be a good conductor of electricity.
What is Metallic?The set of chemical characteristics connected to the elements included in the periodic table's metals category is referred to as having a metallic character. An element's capacity to lose its outer valence electrons determines whether or not it has metallic properties. Thermal and electrical conductivity, metallic brilliance, hardness, ductility, and malleability are a few examples of characteristics that are associated with the metallic character. Francium is the most "metallic" element, followed by cesium. Generally speaking, the metallic character grows as you move toward the periodic table's lower right corner.
What is Electricity?Electricity is a phenomenon involving electrical charges, either moving or fixed. A fundamental characteristic of matter, electric charge is carried by elementary particles. The electron, a particle involved in electricity, has a charge that is typically referred to as negative. The accumulation or motion of numerous electrons is what causes electricity's different manifestations.
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A satellite of mass M is in a circular orbit of radius R about the centre of the earth. A meteorite of the same mass falling toward the earth, collides with the satellite completely elastically. The speed of the satellite and the meteorite just before collision are the same The subsequent motion of the combined body will be
a) in circular orbit of different radius
b) in a circular orbit of radius R
c) in an elliptical orbit
d) such that it escapes to infinity
According to the previous statement, the subsequent motion of the combined body will be in an elliptical orbit. Correct answer: letter C.
When two objects of the same mass collide in a completely elastic manner, their combined motion will be a combination of their original motions. In this case, the satellite and the meteorite had the same velocity just before the collision, so the combined motion will be an elliptical orbit.
The law of conservation of momentum states that the total momentum of a system remains constant. This means that in a collision, the total momentum of the system after the collision will be equal to the total momentum of the system before the collision, or:
Momentum Before Collision = Momentum After CollisionIn the case of two objects of the same mass colliding completely elastically, the momentum of an object before the collision is equal to the mass of the object multiplied by its velocity. Therefore, the total momentum before the collision is equal to twice the momentum of one object before the collision.
After the collision, the total momentum of the combined body will be equal to the total momentum of the system before the collision, which is equal to twice the momentum of one object before the collision. This means that the combined body will move in an elliptical orbit with the same speed and direction as the original objects before the collision.
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If M^aL^bT^c is the dimensional formula of force, find 2a - b-c.
Answer:no
Explanation:
no
There exist two parallel 1 m x 1 m x ~0 m (infinitesimally thin) conducting plates sitting
parallel to each other and the xz-plane. The positively charged plate is at y = 0, and the negatively
charged plate is at y = 0.01 m. An electron is released from rest in between the charged plates. Explain
why the electron moves in the proper direction in terms of the forces acting on the electron.
An electric field is a region in which electric charges sustain electrical conduction. An electric field describes the electrical environment around an electron.
What is meant by electric force?The electric force is the force between two charged bodies due to electric charges. The electric field at a point indicates the force experienced by a positive unit test charge at that point.
In this case, electrons move to higher potentials. Since the electric field is directed from the positive plate to the negative plate, electron acceleration occurs towards the negative plate and the negative plate is deflected towards the positive plate.
In this case, the electrostatic force is F = E q,
Here the electric field E = V/d is constant and the charge on the electron is constant, so the force on the electron is constant. Hence, the electron moves in the proper direction in terms of the forces acting on the electron.
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Find the magnitude of the sum of these two vectors.
Answer:
sol:
tanβ=[tex]\frac{101*sin(60)}{85+101*cos(60)}[/tex]
β=[tex]tan^{-1}[/tex](0.64552)
β=32.84
therefore, the direction is 32.84
Two runners race each other around a circular track. The track is 500 meters long and 159 m across (the diameter of the circle). Runner A trips at the half- way mark and doesn't get up Runner B finishes the race. Is there a difference? Explain with a diagram: Which runner has the greater displacement? Which ran the greatest distance?is there a difference?explain with a diagram
The higher displacement [highest increase in bare ground from the start position] is caused by Runner A. Runner B traveled the furthest, covering the entire track.
Simply put, what is displacement?The verb "to displace" refers to the movement or removal of anything. The location of an object is changed, which is the definition of displacement.
What is a displacement example?Change in quite an object's location in relation to an image plane is known as displacement. For instance, a billiards ball travels from one spot to another because a player strikes it. It is alleged to have moved. A vector quantity with both speed and phase is displacement.
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Air flows through this tube at a rate of 1100cm³ / s. Assume that air is an ideal fluid.
(Figure 1)
What is the height h of mercury in the right side of the U-tube?
Express your answer with the appropriate units.
h = ____ ____
The height of the mercury on the right side of the tube is 3.69 cm.
What is the height of the mercury on the right side of the tube?The height of the mercury on the right side of the tube is determined as follows:
Using Bernoulli's equation;
p₁ + ¹/₂ρv₁² = p₂ + ¹/₂ρv₂²
p₁ - p₂ = ¹/₂ρ(v₁² - v₂²)
From the continuity equation;
A₁v₁ = A₂v₂
v₁ = A₂v₂ / A₁
v₁ = A₂v₂ / π(r₁/2)²
The rate of airflow in the tube (A₁v₁ = A₂v₂) is 1100 cm³/s
Substitute the values in the equation above;
v₁ = 1100/π(/2)²
v₁ = 350.14 cm/s or-3.50 m/s
Also, v₂ = A₁v₁/A₂
v₂ = 1100/ π(0.4/2)²
v₂ = 8753.5 cm/s or 87.5 m/s
The pressure difference in the U-shaped tube is
p₁ - p₂ = ρ'gh
where;
ρ' is the density of mercury = 3.6 * 10³ kg/m³
Solving for h in the equation above;
h = p₁ - p₂ / ρ'g
Note that p₁ - p₂ = ¹/₂ρ(v₁² - v₂²)
Therefore, h = ¹/₂ρ(v₁² - v₂²) / ρ'g
Substituting the values in the equation;
h = ¹/₂(1.29 )((87.5) - (3.50)) / (13.6 * 10³)(9.8)
h = 0.0369 m or 3.69 cm
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Calculate the energy used when is ship's anchor which 4, 000N is lifted up from the sea bed which is 50m below the ship
Explanation:
Work done = force × distance
= 4,000 × 50
= 200,000 joules
A wire X of Resistance 200, is replaced by wire Y of Resistance 35 A. Both wires are made of the same material, Wire Y is double the area of wire X Wire Y has a length of 2.5m.
Find the length of wire X
Length
- If wire X is connected to a battery of emf-12V. Calculate the current in the wire.
Current
-Calculate the charge passing through the wire in 5 minutes
Charge.
iv-Calculate the Energy consumed by the wire in half an hour.
(a) The length of wire X is 7.14 m.
(b) The current in the wire is 0.06 A.
(c) The charge passing through the wire in 5 minutes is 18 C.
(d) The Energy consumed by the wire in half an hour is 1,296 J.
What is the length of wire X?
The length of wire X is calculated by applying the following formula as shown below;
ρ = RA / L
where;
R is the resistance of the wireA is the area of the wireL is the length of the wireSince the wires are made of the same material, resistivity of wire X = resistivity of wire Y
let wire X = 1
let wire Y = 2
R₁A₁ / L₁ = R₂A₂ / L₂
L₁ = ( R₁A₁L₂ ) / ( R₂A₂ )
L₁ = ( 200Ω x A₁ x 2.5 m ) / ( 35Ω x 2A₁ )
L₁ = 7.14 m
The current flowing in wire X is calculated as follows;
V = IR
I = V / R
where;
V is the voltageR is the resistanceI = ( 12 V ) / ( 200Ω )
I = 0.06 A
The charge passing through the wire in 5 minutes is calculated as follows;
Q = It
Q = 0.06 A x ( 5 x 60 s )
Q = 18 C
The Energy consumed by the wire in half an hour is calculated as;
E = Pt
where;
P is powert is timeE = (IV) x ( t )
E = ( 0.06 A x 12 V ) x ( 30 mins x 60 s )
E = 1,296 J
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If α=40°, β=60°, and M=4.0 kg, determine the tension in string 1 shown.
The magnitude of the tension in string 1 is 20 N.
option D is the correct answer.
What is the tension in string 1?The magnitude of the tension in string 1 is calculated by applying the following kinematic equation.
T₁ cosα + T₂ cosβ = W cos90 ---- ( 1 )
T₁ sinα + T₂ sinβ = W sin90 ----- ( 2 )
Substitute the given values for β and α, to determine the value of Tension T₁ and Tension T₂.
-T₁ cos(40) + T₂ cos(60) = W cos90
-0.766T₁ + 0.5T₂ = 0
0.5T₂ = 0.766T₁
T₂ = ( 0.766T₁ ) / 0.5
T₂ = 1.53 T₁ ----- (3)
T₁ sinα + T₂ sinβ = W sin90
T₁ sin(40) + T₂ sin(60) = (4 x 9.8) sin90
0.64T₁ + 0.886T₂ = 39.2
Substitute the value of T₂ into the above equation as shown below.
The tension in string 1 is calculated as follows;
0.64T₁ + 0.886(1.53 T₁) = 39.2
0.64T₁ + 1.33T₁ = 39.2
1.97T₁ = 39.2
T₁ = 39.2 / 1.97
T₁ = 19.99 N ≈ 20 N
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The amount of energy released in the cellular respiration is similar to the amount released when methane reacts with oxygen. Why does our body not burn?
Each step of the energy released during cellular respiration is accompanied by the synthesis of ATP. Only a tiny fraction of energy is converted to heat that's why our body doesn't burn.
In a nutshell, what is cellular respiration?The process through which organisms use oxygen to break down food molecules in order to get chemical energy for cellular processes is known as cellular respiration. The cells of animals, plants, and fungi, as well as those of algae and other protists, all engage in cellular respiration.
What is the location of cellular respiration?Cells produce energy through a process called cellular respiration. Prokaryotic and eukaryotic cells both have mitochondria and cytoplasm where cellular respiration takes place.
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a 0.40 kg object is moving on a frictionless surface with a speed of 30 m/s. A force of 2.0N is applied continually until the velocity of the object has been reversed. How long was the force applied?
The time the force was applied to the obeject of mass 0.4 kg is 12 seconds
What is impulse?
Impulse is the product of force and time.
To calculate how long the force was applied, we use the formula of impulse.
Formula:
Ft = m(v-u).................. Equation 1Where:
F = Forcet = Timem = Massv = Final velocityu = Initial velocityFrom the question,
Given:
m = 0.4 kgv = -30 m/s (reversed)u = 30 m/sF = -2.0 N (Acting against the direction of motion)Substitute these values into equation 1 and solve for t
-2.0t = 0.4(-30-30)-2.0t = -24t = -24/-2t = 12 secondsHence, the time is 12 seconds
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The immediate source of the intercellular fluid surrounding
all human body cells is
A) blood plasma
B) enzymatic secretions
C) glomerular filtrations
D) lymphatic tissue
Answer: lymphatic tissue
Explanation:
1-kg of carbon dioxide is compressed from 1 MPa and 200C to 3 MPa in a piston-cylinder
device arranged to execute a polytropic process for which PV1.2 = constant. Determine the final
temperature treating the carbon dioxide as (a) an ideal gas and (b) a van der Waals gas
The temperature of the ideal gas is 264.5°C while the temperature of the van der Waals gas is 260.1°C
What is Adiabatic ProcessAn adiabatic process is a thermodynamic process in which no heat is transferred to or from the working fluid. This process occurs when the change in the internal energy of the system is equal to the work done. Examples of adiabatic processes include the compression and expansion of gases, the compression of liquids, and the cooling and heating of a gas.
(a) Final temperature (T2) of the ideal gas =
T2 = T1(P2/P1)^((γ-1)/γ)
T2 = 200(3/1)^((1.4-1)/1.4)
T2 = 264.5°C
(b) Final temperature (T2) of the van der Waals gas =
T2 = T1(P2/P1)^((γ-1)/γ) - (a/V2)(P2 + b)
Where, a = 3.567 kJ/molK and b = 0.0427 L/mol
T2 = 200(3/1)^((1.4-1)/1.4) - (3.567/1)(3 + 0.0427)
T2 = 260.1°C
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while pushing a crate with a constant force is the crate traveling at a constant speed, increasing speed, or decreasing speed?
Due to the friction's opposing force, the crate travels at a constant speed; otherwise, its speed would increase.
When the individual stops pushing, what happens to the crate's speed?The crate continues to move when the worker stops pushing, albeit more slowly. However, since the floor and the bottom of the container are still moving past one another, a friction force (frict) directed against the motion of the crate will still exist.
What drives the crate's acceleration beside the truck?A flatbed truck's bed has a large, hefty crate on it. The crate accelerates as well because it is connected to the truck and continues to move forward as it does. The crate's acceleration is due to what force.
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What's one major difference between the earth's greenhouse effect and an actual greenhouse?
Select one:
a.
Heat escapes from a greenhouse more easily than it does from Earth's atmosphere
b.
The glass in a greenhouse traps heat, while greenhouse gases in the atmosphere absorb and recycle heat
c.
There is no significant difference; both work pretty much the same way
d.
Actual greenhouses are cold in winter, while the greenhouse effect has led to warm winters across the earth
The difference between the earth's greenhouse effect and an actual greenhouse is that the glass in a greenhouse traps heat, while greenhouse gases in the atmosphere absorb and recycle heat. That is option B.
What is a green house gas?The greenhouse gas is the type of gas that is found in the earth's atmosphere that has the ability to absorb heat from the earth's environment.
Examples of greenhouse gases include the following:
carbon dioxide, methane, nitrous oxide, and water vapor.An ordinary greenhouse is used to grow crops such as tomatoes and tropical flowers. Heat is bring trapped inside these houses as the sun shines during the day time.
Therefore, it can be concluded that the major difference between the earth's greenhouse effect and an actual greenhouse is that the glass in a greenhouse traps heat, while greenhouse gases in the atmosphere absorb and recycle heat.
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a car moving at 20m/s applies breaks and slides to stop in 5 second. find the coefficient of friction?
The friction is the stopping force. and the coefficient of friction is 0.4
What is Friction ?Friction is a force that opposes motion. It is a vector quantity and it is measured in Newton.
Given that a car of mass 1200 kg is moving at 20m/s applies breaks and slides to stop in 5 second.
The acceleration of the car can be found by
v = u - at
Where
v = 0u = 20 m/st = 5 sa = ?Substitute all the parameters
0 = 20 - 5a
5a = 20
a = 20/5
a = 4 m/s²
Frictional force F = ma
F = 1200 × 4
F = 4800N
Also, F = μN
Where μ = the coefficient of friction
N = normal reaction = mg
N = 1200 × 9.8
N = 11,760 N
Substitute N and F into the formula
4800 = 11760μ
μ = 4800/11760
μ = 0.4
Therefore, the coefficient of friction is 0.4
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Metal panels that are designed to act as stressed-skin panels are attached directly to the structural frame of the building with
a. bags
b. straps
c. clips
d, mats
Metal panels that are designed to act as stressed-skin panels are typically attached directly to the structural frame of the building using straps, clips, or mats.
Straps are typically used to connect the panel to a supporting member, while clips are used to secure the panel to a non-supporting member. Mats are used to provide additional support for the panel and to distribute the load evenly across the panel.
This is beneficial for the structural integrity of the building since it ensures that the panel will not be subjected to too much stress in one specific area. Additionally, it allows for better load distribution, which can help to reduce the overall weight of the building, as well as reduce stress on the individual panels.
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You are driving a 1200.0-kg car at a constant speed of 14 m/s along a straight, level road. As you approach an intersection, the traffic light turns red. you slam in the brakes, the car’s wheels lock, the tires begin skidding, and the car slides to a halt in a distance of 25.0 m. What is the coefficient of kinetic friction between your tires and the road?
The coefficient of kinetic friction between your tires and the road is determined as 0.4.
What is the acceleration of the car?The acceleration of the car is determined by applying the following kinematic equation as shown below;
v² = u² - 2as
where;
v is the final velocity of the caru is the initial velocity of the cara is the acceleration of the cars is the distance travelled by the car before stoppingwhen the car stops, the final velocity of the car = 0
0 = u² - 2as
2as = u²
a = u² / 2s
a = ( 14² ) / ( 2 x 25 )
a = 3.92 m/s²
The coefficient of kinetic friction is calculated by applying the following equations;
μ = Ff / W
where;
Ff is the force of frictionW is the weight of the carAt a constant speed, applied force = force of friction
μ = Ff / W
μ = ( ma ) / ( mg )
μ = a / g
where;
g is acceleration due to gravityμ = 3.92 / 9.8
μ = 0.4
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A piece of a neutral dielectric is put near a very positively charged metal sphere of a Van de Graaff generator.
[The dielectric is put near the generator by being placed in the palm of a insulating
glove and put ~10 cm from the sphere.] What happens to the dielectric? Explain. [An ideal dielectric is
an insulating medium in which the electrons and nucleus are influenced subtly by external influences.]
The following is the explanation for the given question:
What are Dielectrics?
Dielectrics can generally be described as materials with very low electrical conductivity. It act as an insulator which has no free electrons. When an electric field is applied dielectrics can be easily polarized.
Explanation:
By induction, the negative charges in the neutral dielectric are nearer to the positive sphere, which means by induction negative and positive charges are separated in the dielectric. Negative charges are nearer to the positive metal sphere and positive charges are further from the metal sphere as shown in the below diagram.
Hence, the negative charges are nearer to the positive metal sphere and positive charges are further from the metal sphere.
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Because the neutral dielectric negative charges are closer to the positive sphere through induction, the dielectric negative and positive charges are separated.
Negative charges are closer to the positive metal sphere than positive charges are to it. As a result, positive charges are further away from the positive metal sphere, while negative charges are closer to the positive metal sphere.
How do dielectrics work?Materials with a very low electrical conductivity are known as dielectrics. It serves as an insulator because it lacks free electrons. Dielectrics can easily become polarized when an electric field is applied.
When a dielectric is placed in an external electric field, what happens?A dielectric becomes polarized when placed in an electric field. A polarized material has a smaller electric field than the applied field.
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A proton follows the path shown in (Figure 1) . Its initial speed is v0 = 2.8×106 m/s.
What is the proton's speed as it passes through point P?
Express your answer to two significant figures and include the appropriate units.
The proton's speed as it passes through point P is Vp = 1.72 × 10^6 m/s
What is a proton?A proton is described as a stable subatomic particle, symbol p , H⁺, or ¹H⁺ with a positive electric charge of +1 e elementary charge.
From the question have the following parameters
A fixed charge, Q = -10 nC
Initial position of charge particle, proton (q), ro = 3mm
Final position of charge particle, proton (q),
rp = 4mm
Initial velocity of charged particle,
vo =2.8 x 10^6 m/s
Let
vp be the final speed of proton
We then Apply conservation of Energy:
Initial (Potential + kinetic) Energy = Final (Potential + kinetic) Energy
kQq ro + 1/2mVo² = kQq rp + 1/2mVp²
m = 1.67 x 10^-27
Substituting the values and converting from mm to meters, we have that)
Vp = 1.72 × 10^6 m/s
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Determine an expression for the time from when the block collides with the spring to when the spring reaches maximum compression
Answer:
1/2 m v^2 = 1/2 k x^2 energy of block will be transferred to spring
1/2 m (x/t)^2 = 1/2 k x^2 x/t max speed of block
t^2 = m / k
t = (m/k)^1/2 = 1 / ω since ω = (k / m)^1/2 for SHM
ω = 2 π f = 2 π / T where T is period
T = 2 π * (m / k)^1/2
t = T / 4 = π / 2 * (m / k)^1/2 1/4 period needed for 1/4 oscillation
Which diagram shows the correct setup for an electromagnet?
O A.
O
O
B.
Battery.
Battery.
- Battery
Ammeter
A
Ammeter
A
Ammeter
A
个
Battery
✓
SUBMIT
Answer:
B
Explanation:
You want the diagram that shows the correct setup for an electromagnet.
ElectromagnetAn electromagnet is defined as a soft metal core that becomes a magnet when current is passed through a coil around it. Only diagram B shows a coil around a metal object. That coil is arranged in a circuit with a battery so that current will flow through the coil.
Diagram B shows the correct setup for an electromagnet.
A runner begins a race from rest and reaches a final speed of 22mph. It takes 3.45s. If the runner's mass is 76.4 kg and 1 mile = 1,609.34m. A) What is the runner's acceleration?
B) What is the magnitude of the downward force acting on the runner?
Acceleration:
a = (22 mph - 0 mph) / (3.45s) = 6.37 mph/s
Magnitude of the Downward Force:
F = m*a = 76.4 kg * 6.37 mph/s = 484.53 N
How do we sip water from glass using straw?can we sip water with straw on moon?
