Answer:
A. Conduction
Explanation:
Heat is transferred from one object to another but does not involve the movement of particles between the two objects. The only condition for this to happen is for the objects to be in contact. Contact ensures that adjacent particles transmit energy between them. It is measured in watts per meter per kelvin W/mK
Insulation prevents transfer of heat.
Thermal expansion is one effect of transfer of heat.
Conduction is one of the three ways to transfer heat, and one of the two ways to do it without transferring matter. (A)
Earth’s orbital speed is approximately _____. 1600 kilometers per hour 110 kilometers per hour 43,000 kilometers per hour 107,000 kilometers per hour
Answer:
107,000 kilometers per hour.
Explanation:
1. How much heat is needed to melt 10.0 kg of lead at its melting point?
Answer:
230 kJ
Explanation:
The amount of heat needed to melt a substance at its melting point is:
[tex]Q=m\lambda_f[/tex]
where
m is the mass of the substance
[tex]\lambda_f[/tex] is the latent heat of fusion of the substance
In this problem,
m = 10.0 kg is the mass of the lead sample
[tex]\lambda_f = 23 kJ/kg[/tex] is the latent heat of fusion of lead
Substituting,
[tex]Q=(10.0 kg)(23 kJ/kg)=230 kJ[/tex]
Answer:
Q = 230 kJ
Explanation:
Heat required to melt a given matter at its melting point is given by latent heat of fusion
It will remain constant for a given metal
for lead the latent heat of fusion is given as
[tex]L = 23 kJ/kg[/tex]
now we know that
[tex]Q = mL[/tex]
here m = 10 kg
so heat required to melt 10 kg of lead is given as
[tex]Q = 10 \times 23[/tex]
[tex]Q = 230 kJ[/tex]
- Po
2. Which phenomenon can be explained by both the
particle and wave models of light?
(1) photoelectric effect
(2) diffraction
(3) reflection
(4) interference
Interference is the phenomenon that can be explained by both the particle and wave models of light. It occurs when waves or particles overlap and interact.
Explanation:The phenomenon that can be explained by both the particle and wave models of light is Interference (4). In the case of wave model, interference happens when two or more waves overlap together and the resulting electric field at that location is the vector sum of the fields due to the individual waves. In the case of particle model, when light acts as a particle, the individual light particles called photons interfere or interact with each other causing the Interference phenomenon.
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Both diffraction and interference can be explained by both the particle and wave models of light.
Explanation:
Particle and Wave Models of Light:
The phenomenon that can be explained by both the particle and wave models of light is diffraction. Diffraction occurs when light waves encounter obstacles or openings that are about the same size as the wavelength of the light. It causes the light to spread out and bend around the edges of the obstacle or opening.
Interference is another phenomenon that can be explained by both the particle and wave models of light. It occurs when two or more light waves combine and their amplitudes either reinforce or cancel each other out, resulting in areas of increased or decreased brightness.
The photoelectric effect can be explained by the particle model of light, where light is treated as a stream of particles called photons. The photoelectric effect occurs when light shines on a metal surface, causing the ejection of electrons from the atoms of the metal.
Reflection can also be explained by the wave model of light. When light waves encounter a boundary between two different media, some of the light is reflected back.
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When can a theory be modified if a new type of technology allows for new observations that raise new questions?
A-immediately, while the questions about the theory are being asked
B-after new hypotheses related to the theory are tested in experiments
C-only after the new observations disprove all parts of the theory
D-while scientists begin to think about how the theory could improve
Answer:
id say B, but not sure
Explanation:
Answer: B-After new hypotheses related to the theory are tested in experiments.
Explanation:
A scientific theory can be define as a proposed explanation for a natural event or phenomena that is obtain after repeated experimental procedures. A scientific theory can be changed or amendments can be done in it's content with new discoveries and related evidences.
The implementation of the new technology can reduce the time to conduct the experiments and will also improve the accuracy. Therefore, a new hypothesis can be generated on the basis of the pre-proposed theory by utilizing the new technology.
____________are necessary to explain research findings.
A.Variables
B.Research models
C.Theories
D.Symbols
Answer:
C. Theories
Explanation:
Theories basically explain why of research findings. By definition, theories help us understand, explain, and predict the occurrence of a phenomena. In research, theories support research findings by explaining how the variables involved influence each other not merely based on observation during this one experiment. It also helps validate the findings by relating it to theories of previous work.
What is the equivalent resistance of the circuit
Answer:
18
Explanation:
Position vs Time
Calculate the slope of the line on the graph using the
formula
The slope of the line is____m/s
That was pretty clever, how you neatly and cleanly cut off the part of the photo that shows the formula we're supposed to use.
At time=0, the position is zero, and at time=5 sec, the position is 20 m.
Slope = (change in position)/(change in time)
Slope = (20m - 0m) / (5s - 0s)
Slope = (20m) / (5s)
Slope = 4 m/s
Answer:
4
Explanation:
Which statement is true ?
Answer:
it depends only on the forces acting along the y axis I think
Answer:
option B
Explanation:
The correct answer is option B.
Assuming the motion of the object will be in the x-direction.
To move the object we need to apply the force on the body.
the line of action of the force should be in the x-direction to overcome the resistance to move the object.
An unmanned spacecraft travels to Mars. Mars has a lower strength of gravity than Earth. Where in the image is the spacecraft’s weight the greatest?
The spacecraft's weight would be the greatest on Earth, where the strength of gravity is the highest.
The weight of an object is the force of gravity acting on it. Because Mars has less gravity than Earth, an object's weight on Mars would be less than its weight on Earth. As a result, the spacecraft's weight would be greatest on Earth, where gravity is strongest.
An item carried to Mars would weigh around 38% of its weight on Earth, according to. As a result, if the spacecraft weighs 1000 kg on Earth, it will only weigh 380 kg on Mars.
Thus, the weight of the spaceship would be greatest on Earth, where gravity is strongest.
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What efficiency of a car's engine when heat input is 200,000 joules and waste heat is 150,000 joules?
A. 75%
B. 35%
C. 25%
D. 85%
The answer is 25% because 50,000 is 25% of 200,000
The efficiency of a car's engine when given the heat input and waste heat is 50%.
Explanation:The efficiency of a car's engine can be calculated using the formula:
Efficiency = (Useful Output Energy / Input Energy) x 100%
In this case, the heat input is 200,000 joules and the waste heat is 150,000 joules. Therefore, the efficiency can be calculated as:
Efficiency = (200,000 - 150,000) / 200,000 x 100% = 50%
So, the correct answer is not provided in the options. The efficiency of the car's engine is 50%.
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Who is considered the father of atomic theory?
Rutherford
Thomson
Dalton
Democritus
Answer:
The answer is: John Dalton
John Dalton considered the father of atomic theory
Hope this helped :) <3
Explanation:
An object of mass 5 kilograms is moving across a surface in a straight line with a speed of 3.5 meters/second. What amount of force would be
required to keep the object in motion if you ignore the surface friction?
A.O newtons
B.17.5 newtons
C.3.5 newtons
D.5 newtons
Answer:
0 newtons
Explanation:
F =MA
because constant motion means 0 acceleration.no changein velocity
F = 5 x 0m/s²
F = 0
HOPE THIS HELPS THX
Answer: The amount of force that is required to keep the object in motion is 0 N
Explanation:
Force is defined as the push or pull on an object with some mass that causes change in its velocity.
It is also defined as the mass multiplied by the acceleration of the object.
Mathematically,
[tex]F=ma[/tex]
where,
F = force exerted on the object
m = mass of the object = 5 kg
a = acceleration of the object = [tex]0m/s^2[/tex] (Speed is constant)
Putting values in above equation, we get:
[tex]F=5kg\times 0m/s^2\\\\F=0N[/tex]
Hence, the amount of force that is required to keep the object in motion is 0 N
the motion of water in a dam serves human beings by generating electricity as it is a controlled motion. give one example for an uncontrolled motion. what effects could it cause
Answer:
Heat
It can burn things
Answer:
When the water flows in the dam or reservoir is not restricted or is impossible to restrict due to flood, earth quake or some other natural calamity, life is endangered both to human beings and animals as the water may pass through the forests and may even enter the cities and residential area when the limit is reached and the dam overflows.
Dam plays an vital roles on drinking water supply, flood control, electricity generation, fishing, tourism, etc. The creation of storage and head allow dams to generate electricity. Another situation is when the construction of the dam collapses due to structural failure or leaks.
which of the statements about waves is true?
A. in longitudinal waves, particles move perpendicular to the direction the wave is traveling.
B. Both transverse and longitudinal waves can travel through water
C. Electromagnetic waves are a type of longitudinal waves.
D. In a transverse wave, particles move parallel to the direction the wave is traveling.
The true statement about waves is that both transverse and longitudinal waves can travel through water. Transverse waves oscillate perpendicularly to the wave direction, while longitudinal waves oscillate parallel to the wave direction.
The question pertains to the characteristics of different types of waves. A true statement about waves needs to accurately describe the motion of particles relative to the direction of the wave's travel.
Statement B: 'Both transverse and longitudinal waves can travel through water'. This is a true statement. Water waves are actually a combination of transverse and longitudinal waves, where the particles in water move in circular paths.
Transverse waves involve oscillations that are perpendicular to the direction the wave travels. Longitudinal waves, on the other hand, involve oscillations that are parallel to the direction of wave propagation.
A beam of electrons moves at right angles to a magnetic field of 4.5 × 10-2 tesla. If the electrons have a velocity of 6.5 × 106 meters/second, what is the force acting on the electrons? The value of q = -1.6 × 10-19 coulombs.
To calculate the force acting on electrons moving at right angles to a magnetic field, we use the formula F = qvB, considering the given values for the charge of the electron, velocity, and magnetic field strength. The calculated force is -4.68 × 10^-15 Newtons.
Explanation:The question asks for the force acting on electrons moving at right angles to a magnetic field. To find the force, we use the formula F = qvBsin(θ), where F is the force on the charge, q is the charge of the electron (-1.6 × 10-19 coulombs), v is the velocity of the electron (6.5 × 106 meters/second), B is the magnetic field strength (4.5 × 10-2 tesla), and θ is the angle between the velocity and the magnetic field (90 degrees since they are at right angles). Since sin(90°) = 1, the equation simplifies to F = qvB. Plugging in the values, we get F = -1.6 × 10-19 × 6.5 × 106 × 4.5 × 10-2, which calculates to -4.68 × 10-15 Newtons.
A 2.0-ohm resistor is connected in a series with a 20.0 -V battery and a three-branch parallel network with branches whose resistance are 8.0 ohms each. Ignoring the battery’s internal resistance, what is the current in the battery? Show your work.
4.3A.
The easiest way to solve this problem is find the equivalent resistance for parallel resistor 1/Req = 1/R1 + 1/R2 + 1/R3 in the three-branch parallel network with branches whose resistance are 8Ω.
1/Req = 1/8 Ω + 1/8 Ω + 1/8 Ω
1/Req = 3/8 Ω
Req = 8/3 Ω = 2.667Ω
Req = 2.7Ω
So, the equivalent circuit will be the 20.0V battery in series with a resistor 2.0Ω and the equivalent resistor 2.7Ω.
Using Ohm's Law to find the current provide by the 20.0V voltage source:
V = I*R ------> I = V/R
I = 20.0V/(2.0Ω + 2.7Ω)
I = 20.0V/4.7Ω
I = 4.3A
Your environmental science class has collected information on the trash your school throws away. To reduce the amount of trash your school produces what should you recommend to your principal
Which type of bond is found between the atoms of a molecule?
A. Metallic
B. Delocalized Electron
C. Covalent
D. Ionic
Hello There!
The type of bond that is found between the atoms of a molecule is called "COVALENT" bond.
A covalent bond is where two atoms share a pair of electrons.
The bond between the atoms of molecule is Covalent bond.
Answer: Option C
Explanation:
Covalent bond due to its phenomenal activity is also known as molecular bond. The electron pairs are shared between the atoms, these shared electron pairs are known as "shared pairs or bonding pairs".
This type of covalent bonding establishes balance between the atoms against attractive and repulsive forces. Covalent bonds are more common than ionic bonds.
a scientist plants two rows of corn for experimentation.She put fertilizer on row 1 but does not put fertilizer on row 2 both rows receive the same amount of water and light intensity she checks the growth of the corn over 5 months what is the constant in this experiment
Answer:
The Constant is the amount of water and the light intensity.
Explanation:
Answer: The constant of her experiment is water and sunlight which are necessary for photosynthesis, both factor are common to both plants
Explanation:
If two ends A and B are connected through a metallic wire. If electrons flows from point B to point A. What can you say about the potential A and B.
Answer:
Point A is at higher potential than point B
Explanation:
Electrons are negatively charged - this means that they are attracted by positive charges and repelled by negative charges.
This also means that they tend to move in a direction opposite to the electric field lines (because electric field lines point away from a positive charge and toward a negative charge). So, they also tend to move from a point at lower potential to a point at higher potential.
In this problem, the electrons flow from point B to point A: therefore, point A must have higher potential than point B.
What is the apparent change in frequency of waves due to the motion of a source? Photoelectric effect Prismatic change Doppler effect Wavelength variability
Answer: Doppler effect
Explanation:
The Doppler effect refers to the change in a wave perceived frequency when the emitter of the waves, and the receiver (or observer in the case of light) move relative to each other.
In other words, it is the variation of the frequency of a wave due to the relative movement of the source of the wave with respect to its receiver.
Another important aspect is that the effect occurs in all waves (including light and sound). However, it is more noticeable to humans with sound waves.
The Doppler effect is the apparent change in frequency of waves due to the motion of a source.
A child pulls a wagon at a constant velocity along a level sidewalk. The child does this by applying a 22 newton force to the wagon handle, which is inclined at 35° to the sidewalk as shown below. What is the magnitude of the fore of friction on the wagon?
Answer:
The answer is 18 N.
Explanation:
A force can be divided into components x and y components. The component along the x-axis is called the horizontal component and along the y-axis is called the vertical component. In this case, as the force is in a horizontal direction and is also known as x-component of force. The x- component of force is
Fx = Fcosθ
Fx = 22(cos 35°)
Fx = 22 x 0.819
Fx = 18 N
Child's horizontal pull forces are equal to that of frictional resistance force on the wagon.
The force of friction on the wagon is 18 newtons, balanced by the child's horizontal force component.
To determine the magnitude of the force of friction on the wagon, we need to analyze the forces acting on the system. Because the wagon moves at a constant velocity, the net force acting on it must be zero according to Newton's First Law.
The child applies a net force of 22 newtons at an angle of 35 degrees to the horizontal. We can break this force into horizontal and vertical components:
Horizontal Component (F_horizontal): F_horizontal = 22 N * cos(35°)Vertical Component (F_vertical): F_vertical = 22 N * sin(35°)Calculating the components, we get:
F_horizontal ≈ 22 N * 0.819 = 18 NF_vertical ≈ 22 N * 0.574 = 12.6 NSince the wagon is moving at a constant velocity, the horizontal force exerted by the child (F_horizontal) must be balanced by the force of friction (f_friction).
Therefore, the magnitude of the force of friction on the wagon is 18 newtons.
Which circuit has exactly two resistors connected in parallel
Answer: D
Explanation:
Option(D) is the two resistors connected in parallel.
ResistorA circuit exists simply a closed loop through which charges can continuously move. To establish that charges exist not only moving through the light bulb filament but also through the wires connecting the battery pack and the light bulb, a variation on the above activity exists completed.
A resistor exists as an electrical component that limits or restrains the flow of electrical current in an electronic circuit. Resistors can even be utilized to furnish a specific voltage for an active device such as a transistor.
A resistor exists as a passive two-terminal electrical element that implements electrical resistance as a circuit element. In electronic circuits, resistors exist used to reduce current flow, adjust signal levels, separate voltages, bias active elements, and terminate transmission lines, among other uses.
Resistors exist in parallel if their terminals are connected to identical two nodes. The equivalent overall resistance exists smaller than the smallest parallel resistor.
Here from the given options Option(D) is the two resistors connected in parallel.
It is shown below (option d).
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A car travelled a distance of 348 km in 6.0 hours. What was it’s speed in (a) km/h and (b) m/sec?
Answer:
[(a=58)(b=16)] is the homogeneous mixture
The speed of a car is 58 km/h and 16.11 m/s.
What is speed?Speed is distance travelled by time.Speed = distance / time S = D/THow to calculate car's speed in km/h?Speed S = D / T
∴ S = 348/6
∴ S = 58 km/h
How to calculate cars speed in m/s?To calculate car's speed in m/s we need to covert km/h in m/s.To covert it we have to multiply 348/6 with 5/18.So , speed S =( 348 x 5 ) / ( 6 x 18 )
∴ S = 16.11 m/s.
Thus, The speed of a car is 58 km/h and 16.11 m/s.
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A motor with an operating resistance of 2.21 ohms is connected to a voltage source. The current in the circuit is 3.8 A and the power of the system is 32 watts. What is the voltage of the source?
The answer is:
The voltage of the source is 8.40 Volts.
Why?To solve the problem, we need to use the Ohm's Law equation base formula.
We have that we can calculate the voltage using the following equation:
[tex]Voltage(Volts)=Current(Amps)*Resistance(Ohm)[/tex]
So, from the statement we know that:
[tex]Resistance=2.21\Omega\\Power=32W\\Current=3.8A[/tex]
Now, substituting and calculating we have:
[tex]Voltage(Volts)=Current(Amps)*Resistance(Ohm)[/tex]
[tex]Voltage(Volts)=3.8A*2.21\Omega=8.40V[/tex]
Hence, we have that the voltage of the source is 8.40 Volts.
Have a nice day!
The pressure is....... proportional to the area
A- inversely b- directly c- increase D-decrease
We know that pressure is equal to the relation between force applied perpendicular to a certain area.
[tex]p=\dfrac{F}{A}[/tex]
If we express area we get:
[tex]A=\dfrac{F}{p}[/tex]
The pressure is decrease proportional to the area.
Hope this helps.
r3t40
cold syrup flows sluggishly because of??
Answer:
Water is very different from honey, syrup, glycerine, or oil. It pours easily and is not thick and sticky like the others. The property that determines how easily a liquid pours is called VISCOSITY. Water has a low viscosity; syrup has a high viscosity. Liquids with a high viscosity are said to be viscous.
The cold syrup flows sluggishly because syrup has a high viscosity.
Why cold syrup flows sluggishly?Viscosity is a scientific term that describes the resistance to the flow of a fluid. This is often described as the thickness of the fluid which in general is the case although this is not technically the correct term.Water is very different from honey, syrup, glycerin, or oil. It pours easily and is not thick and sticky like the others. Water has a low viscosity, and syrup has a high viscosity.Liquids with high viscosity are said to be vicious.viscosity = shear stress / shear rate.Hence, cold syrup flows sluggishly because of its high viscosity.
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The loudness of sound is the wave's ____.
Answer:amplitude
Explanation:
which of the following objects is in equilibrium?
a- a car moving at a constant velocity
b- a bicicle sitting on the ground
c- an apple falling form a tree
d- a motorcycle speeding up
b- a bicycle sitting on the ground
a- a car moving at a constant velocity
An object is in equilibrium when the forces acting on the object are opposite of one another and equal. In this case, the force of the ground and the force of gravity are both acting on the object, but since the object either isn't moving or has constant velocity, the forces are therefore equal and in opposite directions.
A bicycle sitting on the ground is the statement that suits best to describe the objects in the equilibrium.
Answer: Option B
Explanation:
Equilibrium refers to the static state when there is no movement or displacement. In other words it also means that the forces acting on the object are equal and opposite in direction and the net force will be zero as they are in opposite direction and hence the object doesn't move and remains in the static position. The options A,C,D are related to movement of the object.
Radio waves heading upward from Earth often bounce off the
A. troposphere B. mesosphere
C. stratosphere
D. thermosphere
Answer:
Radio waves heading upward from Earth often bounce off the thermosphere-D.
With height in the thermosphere, temperature increases quickly. This layer includes the ionosphere. This layer aids in radio transmission and is really responsible for the earth's own reflection of radio waves. Thus, option D is correct.
What Radio waves heading upward from Earth?A large percentage of the free electrons in the ionosphere affect radio propagation. High-frequency (HF) radio waves induce oscillations in the free electrons of the ionosphere, which result in energy radiation back down at the same frequency. The radio wave is essentially returned to Earth in this way.
Some of the radio waves that travel from space to Earth's atmosphere are absorbed by the electrons in the ionosphere, but other waves pass through and can be seen by observers on the ground.
Therefore, radio waves heading upward from Earth often bounce off the thermosphere.
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