Answer:
true
Explanation:
Answer: true
Explanation:
3. The velocity of waves on a rope under a tension of 40 N is 10 m/s. If the tension is reduced
to 10 N, what will be the new speed of the wave?
HAI
Answer:
5 m/s
Explanation:
The speed of a wave in a string is related to the tension in the string by the equation
[tex]v=\sqrt{\frac{T}{\mu}}[/tex]
where
v is the speed of the wave
T is the tension in the string
[tex]\mu[/tex] is the linear density of the string
We can rewrite the equation as
[tex]\frac{\sqrt{T}}{v}=\sqrt{\mu}[/tex]
In this problem, the tension in the string is changed; however, its linear mass density remains constant. So we can write:
[tex]\frac{\sqrt{T_1}}{v_1}=\frac{\sqrt{T_2}}{v_2}[/tex]
where:
T1 = 40 N is the initial tension in the string
v1 = 10 m/s is the initial speed of the wave
T2 = 10 N is the final tension in the string
Solving for v2, we find the final speed of the wave:
[tex]v_2=v_1 \sqrt{\frac{T_2}{T_1}}=(10)\sqrt{\frac{10}{40}}=5 m/s[/tex]
Which of the following are created by an arrangement of electric charges or a
current (the flow of electric charges)?
A. A gravitational field
B. A magnetic field
c. A quantum field
O
D. An electric field
GHIDMAT
Final answer:
An arrangement of electric charges or a current creates both an electric field and a magnetic field. Mass generates a gravitational field, not related to charges or currents, and a quantum field is more broadly conceptual and not directly created by charges or currents. So the correct options are B and D.
Explanation:
The arrangement of electric charges or a current, which is the flow of electric charges, creates both an electric field and a magnetic field. Mass produces a gravitational field but is unrelated to electric charges or current. While a quantum field is a more comprehensive concept that includes various types of fields at the quantum level, it is not directly created by just the arrangement of electric charges or current alone.
Electric fields are created around objects that have a net electric charge, and these fields exert forces on other charged objects. On the other hand, magnetic fields are specifically generated by moving charges (current) or changing electric fields as per Ampere's Law and Maxwell's equations. This phenomenon underlies many technologies, including electric motors and magnetic imaging, by utilizing the interaction between current and the magnetic field it produces.
At sea level, liquid water changes into water vapor ata temperature of 100°C. However, at high altitudes, it changes at a
temperature of 95°C. This shows that phase changes of matter are affected not only by temperature but also by...
Precipitation
Coastal winds
Rocky terrain
Pressure
Answer:
Pressure
Explanation:
This is because Air Pressure decreases as we move upwards from the Surface of the Earth. It is as the Number of Air Molecules get reduced at Higher Altitude which in turn reduces Atmospheric Pressure.
Hope This Helps !
Answer: Pressure
Explanation:
In a longitudinal wave, the places where particles of matter are closer together called
Final answer:
In a longitudinal wave, areas where particles are closer together are called compressions. The distance between two compressions or two rarefactions is the wavelength of the longitudinal wave, which characterizes sound waves among others.
Explanation:
In a longitudinal wave, the places where particles of matter are closer together are called compressions. Longitudinal waves consist of alternating areas of compressions and rarefactions. Compressions are regions of higher pressure, whereas rarefactions are areas of lower pressure. The wavelength of a longitudinal wave is the distance between two consecutive compressions or two consecutive rarefactions. Sound waves are a common example of longitudinal waves, where the vibration and movement of particles occur in the same direction as the propagation of the wave.
It's important to note that in a transverse wave, the oscillation of particles occurs perpendicular to the direction of the wave's travel. However, in longitudinal waves, such as sound waves, the particles move back and forth parallel to the direction of the wave, creating the compressions and rarefactions that characterize this type of wave.
What kind of organisms are able to convert sunlight into usable energy?
Answer:
Photosynthetic organisms
Explanation:
The electromagnetic energy of sunlight is converted to chemical energy in the chlorophyll-containing cells of photosynthetic organisms. In eukaryotic cells these reactions occur in the organelle known as the chloroplast
Hope this helps! :)
Answer:
The producers
Explanation:
what is the role of gravity when it comes to changing the velocity of objects?
Gravity is the attraction of every body to every other body due to the masses of each body. The larger the mass, the greater the force. It also depends on the distances: the closer the bodies, the greater the force. Gravity is directed toward the center of a body, and the distance is measured from the center.
When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity causes an object to fall toward the ground at a faster and faster velocity the longer the object falls.
What is the speed of an arrow that takes 1.25 seconds to hit a target 75
meters away?
Answer:
60m/s
Explanation:
v=s÷t
75m÷1.25s=60m/s
Answer
60
Explanation:
This is because if the question gives you the distance and the time, you have to find the speed.
Help ASAP!!
What scientist worked with the laws of motion prior to newton
A) Kepler and Einstein
B) Galileo and Kepler
C) Galileo and Einstein
D) Aristotle and Socrates
Answer:
B)
Explanation:
Aside from his numerous inventions, Galileo also laid down the first accurate laws of motion for masses. Galileo measured that all bodies accelerate at the same rate regardless of their size or mass.
Answer:
Galileo and kepler
Explanation:
Aside from his numerous inventions, Galileo also laid down the first accurate laws of motion for masses. Galileo measured that all bodies accelerate at the same rate regardless of their size or mass.
What were the advantages of the Wechsler Intelligence Test compared to earlier tests?
A. Group of answer choices
B. The scores on subtests could help identify a learning problem that needed attention
C. Performance scores were less likely to be affect by cultural barriers
D. All three were advantages
Performance scores were less likely to be affected by language barriers
A charged particle (q = 8.0 mC), which moves in a region where the only force acting on the particle is an electric force, is released from rest at point A. At point B the kinetic energy of the particle is equal to 4.8 J. What is the electric potential difference VB VA?
The potential difference will be 600 V.
Explanation:
Here the charged particle is said to exhibit a charge of -8 mC. So when it moves from point A to point B, it gains a kinetic energy of 4.8 J. Also, the charged particle is said to exhibit an electrostatic potential energy at points A and B.
The particle will obey conservation of energy. So the sum of energy exhibited by the particle at point B will be equal to the sum of energy exhibited by the particle at point A.
At point A, the kinetic energy is zero and the electrostatic energy will be represented as U₁.
Then, the total energy at point A = U₁
Similarly, at point B, the charged particle will exhibit kinetic energy as well as electrostatic potential energy (U₂).
Total energy exhibited by the charged particles at point B = U₂ + K.E = U₂+4.8.
Then, as per law of conservation of energy:
[tex]U_{2} + 4.8 = U_{1} \\\\U_{1} -U_{2} = 4.8[/tex]
It is known that electrostatic potential energy is the product of charge with the potential at that point.
So, [tex]U_{1} = QV_{1}[/tex] and [tex]U_{2} = QV_{2}[/tex]
Then, [tex]Q (V_{1} - V_{2}) = 4.8\\ \\-8*10^{-3} (V_{1} - V_{2})=4.8\\\\(V_{1} - V_{2}) = \frac{4.8}{-8*10^{-3} } = -0.6*10^{3} = -600 V[/tex]
Then, V₂-V₁ will be 600 V.
Thus, the potential difference will be 600 V.
Mr. Barnes class did an experiment testing electromagnetic strength. As the results show; they discovered that the more coils they used; the stronger the magnetic strength. Which lab design did they use?
A) They created a closed circuit to attract paper clips using a copper wire coiled around an iron nail. The copper wire was also touching only the negative pole of a D- Battery.
B) They created a closed circuit to attract paper clips using a copper wire coiled around a pencil. The copper wire was also touching both the positive and negative poles of a D- Battery.
C) They created a closed circuit to attract paper clips using a copper wire coiled around an iron nail. The copper wire was also touching both the positive and negative poles of a D- Battery.
D) They created a closed circuit to attract paper clips using a insulated wire coiled around an iron nail. The insulated wire was also touching both the positive and negative poles of a D- Battery.
Answer:
c
Explanation:
The correct option is C. They created a closed circuit to attract paper clips using a copper wire coiled around an iron nail. The copper wire was also touching both the positive and negative poles of a D- Battery.
What is electromagnetic strength?
A permanent magnet's magnetic flux constantly flows from its N-pole to its S-pole.
The magnetic field and the current combine to produce force when a conductor is placed in a magnetic field and current passes through the conductor. "Electromagnetic force" is the name of the force.
The direction of the magnetic force, the flux, and the current are all determined by the fleming's left hand rule.
Therefore, The correct option is C. They created a closed circuit to attract paper clips using a copper wire coiled around an iron nail. The copper wire was also touching both the positive and negative poles of a D- Battery.
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PLEASE SHOW STEPS!
You heat a 0.45 kg sample of metal to a temperature of
80 °C then quickly transfer it into a beaker that contains 0.70 kg of water at 15 °C; the specific heat capacity of water is 4 200 J/kg·°C. The highest temperature of the sample plus the water is 21 °C. What is the heat capacity of the sample of metal?
Answer:
The heat capacity of the sample of metal is 664j/kg.°C
Explanation:
Kindly find attached a detailed solution to this question for you reference.
Given data
Mass of sample m1= 0.45kg
Temperature of sample θs= 80°c
Mass of water mw = 0.7kg
Temperature of water θw= 15°C
Specific heat capacity of water Cw=
4200j/kg.°C
Equilibrium Temperature θ3= 21°C
HEAT LOSS BY SUBSTANCE =HEAT GAINED BY WATER
What is Quantity of heat?
Quantity of heat is the amount of heat absorbed or given out by a body Q=mcθ
What is the heat capacity?
Heat capacity is the amount of heat required to raise the temperature of a substance by 1k.The S.I unit is joule per Kelvin J/k
What is specific heat capacity?
The specific heat capacity is the amount of heat required to raise the temperature of 1kg of substance by 1k
When one object heats another, does the temperature increase of one object always equal the temperature decrease of the other object? Explain
Answer:
When one object heats another, the temperature increase of one object does not always equal the temperature decrease of the other object because one object has a higher specific heat than the other.
The temperature increase of one object does not necessarily equal the temperature decrease of the other during a heat transfer process. Factors such as the mass of the substance and certain physical properties related to its phase also influence the heat transferred. Heat transfer is guided by the law of conservation of energy, ensuring total energy remains constant.
Explanation:When two objects at different temperatures come into contact, heat flows from the hotter object to the colder one, a process known as heat transfer. However, the temperature increase of one object does not equal the temperature decrease of the other. This is due to the fact that the heat transferred to or from a substance depends not only on the difference in temperature, but also on the mass of the substance and certain physical properties related to the phase of the substance.
Let's consider two objects, object X with a temperature Tx and object Y with a temperature Ty. When X and Y come into contact, heat spontaneously flows from X (hotter object) to Y (colder object), resulting in a loss of thermal energy for X and a gain for Y. The final temperatures of X and Y will not be simply Tx - Ty, and Ty + Tx, they will depend on the specific heat capacities and masses of the objects (not included in the initial question).
This concept is deeply connected with the law of conservation of energy, which states that energy cannot be created or destroyed, but can only be transferred or transformed from one form to another. Consequently, the total energy of the system (both objects) remains constant during this process of heat transfer.
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8. two +1 C charges are separated by 3000m. What is the magnitude of the electric force between them?
Answer:
1000 N
Explanation:
The magnitude of the electrostatic force between two charged object is given by
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where
k is the Coulomb constant
q1, q2 is the magnitude of the two charges
r is the distance between the two objects
Moreover, the force is:
- Attractive if the two forces have opposite sign
- Repulsive if the two forces have same sign
In this problem:
[tex]q_1=q_2=+1C[/tex] are the two charges
r = 3000 m is their separation
Therefore, the electric force between the charges is:
[tex]F=(9\cdot 10^9)\frac{(1)(1)}{3000^2}=1000 N[/tex]
what is amplitude? Explain in your own words.
40. Determine the amount of time for polonium-210 to decay to one fourth its original quantity. The
half-life of polonium-210 is 138 days. Please show all work. (ref: p.808-813)
Answer:
276 days
Explanation:
in order to decay to half, it will be 138 days. in order to half that again down to a quarter, it will be another 138 days. 138+138 is 276, thus, 276 days.
Answer:
276 days
Explanation:
How are humans able to perceive light waves? Sound waves?
Answer:
Light that is visible to humans makes up only a small portion of the electromagnetic spectrum. In humans, light wavelength is associated with perception of color. The amplitude of light waves is associated with our experience of brightness or intensity of color, with larger amplitudes appearing brighter.
Explanation:
If wind is slackening, which of the following statements is true?
It is not as windy now as it was a little while ago.
It is windier now than it was a little while ago.
The wind is now mixed with rain and sleet.
The wind is creating dangerous driving conditions.
Answer:
It is not as windy now as it was a little while ago
Slackening wind indicates that the wind speed or intensity is decreasing, meaning it is not as windy now as it was a little while ago.
Explanation:When we say that the wind is slackening, it means that the speed or force of the wind is decreasing or getting weaker. It suggests that it is not as windy now as it was a little while ago. A slackening wind does not necessarily mean that the wind is now mixed with rain and sleet, nor does it automatically mean that the wind is creating dangerous driving conditions. It solely relates to the intensity or force of the wind which is lowering.
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two point charges having charge values of 9.2 E -6 C and 3.5 E -6 C, respectively, are separated by 3 E -2 m. What is the absolute value of the mutual force between them
Answer: The absolute value of the mutual force between the two point charges is 5.3952 x 10^-3 N.
Explanation:
The mutual force between two point charges can be calculated using Coulomb's law, which states that the force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them:
F = k * (q1 * q2) / r^2
where F is the force, k is Coulomb's constant (9.0 x 10^9 N m^2/C^2), q1 and q2 are the charges of the two-point charges, and r is the distance between them.
In this problem, q1 = 9.2 E-6 C, q2 = 3.5 E-6 C, and r = 3 E-2 m. Substituting these values into Coulomb's law, we get:
F = (9.0 x 10^9 N m^2/C^2) * [(9.2 E-6 C) * (3.5 E-6 C)] / (3 E-2 m)^2
F = 5.3952 x 10^-3 N
The absolute value of the mutual force between the two point charges is 5.3952 x 10^-3 N.
A 5 cm object is 6 cm from a convex lens, which has a focal length of 7 cm. What is the distance of the image from the lens
Answer: -42 cm
Explanation: It explains after you answer
Answer:
Distance=: -42 cm
Height: 35 cm
Explanation:
Tells you on edg
Mercury has two satellites. True False (I NEED THE ANSWER ASAP!
Answer:
False
Explanation:
Mercury has 0 natural satellites.
Assume that you are performing general maintenance on your bicycle using a black lubricant. When you lubricate the brake levers, what type of
fingerprints are you most likely to leave on them?
When lubricating the brake levers of a bicycle with a black lubricant, you are most likely to leave dark or smudged fingerprints on them. The black lubricant can transfer onto your fingers and when you touch the brake levers, it can leave visible marks that correspond to your fingerprints.
Fingerprints are typically formed by the natural oils and sweat on our skin, and lubricants like oil or grease can actually mask or reduce the visibility of fingerprints.
Therefore, if you are using a black lubricant on the brake levers, you would not leave distinct fingerprints on them. Instead, you may leave smudges or marks from the lubricant itself, which can be visible on the surface of the levers.
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What do you mean by resistance of conductor?state it’s unit.
Answer:
its unit is Ohm
Explanation:
Resistance means material which resist the passing current through it and the value of resistance says how much the material is resisting the current and it temperature dependent and the unit is Ohm.
A light ray strikes a flat, smooth, reflecting surface at an angle of 80° to the normal. What angle does
the reflected ray makes with the surface of the mirror?
Answer:
80 angle of incidence=angle of reflection
Explanation:
Answer:
80 angle of reflection!
Explanation:
Because it is a flat, smooth surface it will reflect like that of a normal plane mirror, so the angle of reflection will be equal to that of the angle of incidence!
Hope this helps you understands!
Please hurry need ASAP!!! When a pendulum swings, at which point is kinetic energy highest?
1
2
3
4
5
Kinetic energy only exist if object has motion.
At point 3 , kinetic energy is highest.
We know that,
Kinetic energy = [tex]\frac{1}{2} mv^{2}[/tex]
Where m is mass of pendulum and v is speed of pendulum.
Since the mass of the pendulum would not change, the only way for kinetic energy to change is for the speed of the pendulum to change.
Kinetic energy is highest when the velocity is the highest. This occurs at the bottom of the pendulum.
At the lowest point (Point 3 ) the pendulum has its greatest speed. All of the energy in the pendulum is kinetic energy and there is no gravitational potential energy.
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A 2000 kg car has a speed of 23 mph at the top of a hill which is 144 m tall. How
fast will the car be going if it coasts to the bottom of the hill?
Answer:
Final speed, v = 54.64 m/s.
Explanation:
Given that,
Mass of a car, m = 2000 kg
Initial speed of the car, u = 23 mph = 10.28 m/s
height, h = 144 m
We need to find the speed of the car at the bottom of the hill. Let v is the speed. Applying conservation of energy as :
[tex]\dfrac{1}{2}mu^2+mgh=\dfrac{1}{2}mv^2\\\\v^2-u^2=2ah[/tex]
a = g here
[tex]v=\sqrt{2gh+u^2}\\\\v=\sqrt{2\times 10\times 144+(10.28)^2}\\\\v=54.64\ m/s[/tex]
So, the speed at the bottom of the hill is 54.64 m/s.
Using the principle of conservation of energy, the car will be going approximately 53.7 m/s when it reaches the bottom of the hill.
Explanation:The question basically involves the principle of conservation of energy. You need to equate the total energy at the top of the hill to the total energy at the bottom. The total energy at the top is the sum of kinetic and potential energies. The kinetic energy is 0.5* m * v^2, where m = 2000 kg (mass) and v = 23 mph = 10.3 m/s (velocity). The potential energy is m * g * h, where g = 9.8 m/s^2 (gravity) and h = 144 m (height). The total energy at the bottom is kinetic energy (since potential energy is 0), which is 0.5 * m * u^2 where u is the final velocity. Equating the energies and solving for u, we get u = sqrt(2*g*h + v^2) =~ 53.7 m/s.
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7.
Which would take more force to stop in 10 seconds: an 8.0-kilogram ball rolling in a straight line at a speed
of 0.2 m/sec or a 4.0-kilogram ball rolling along the same path at a speed of 1.0 m/sec?
8.
The momentum of a car traveling in a straight line at 20 m/sec is 24,500 kg-m/sec. What is the car's mass?
9.
A 0.14-kilogram baseball is thrown in a straight line at a velocity of 30 m/sec. What is the momentum of the
baseball?
10. Another pitcher throws the same baseball in a straight line. Its momentum is 2.1 kg m/sec. What is the
velocity of the ball?
11. A 1-kilogram turtle crawls in a straight line at a speed of 0.01 m/sec. What is the turtle's momentum?
Plz help
Answer:
7. the ball with a mass of 8.0kg
8.1225 kg
9.4.2 kg-m/sec
10.15m/sec
11.0.001kgm/sec
Final answer:
The 4.0-kilogram ball requires more force to stop in 10 seconds. The car's mass is 1225 kg. The baseball's momentum is 4.2 kg-m/sec, and the turtle's momentum is 0.01 kg-m/sec.
Explanation:
To determine which ball requires more force to stop in 10 seconds, the momentum of each ball must be calculated. The force required to stop an object is related to the change in momentum and the time over which that change occurs (Force = change in momentum / time). The momentum of an object is the product of its mass and velocity (momentum = mass times velocity). So for the 8.0-kilogram ball, the momentum is 8.0 kg times 0.2 m/sec = 1.6 kg times m/sec. For the 4.0-kilogram ball, the momentum is 4.0 kg times 1.0 m/sec = 4.0 kg times m/sec. Therefore, the 4.0-kilogram ball would take more force to stop within the same time frame because it has a greater momentum.
The momentum of a car can be found by rearranging the momentum formula (momentum = mass times velocity) to solve for mass (mass = momentum / velocity). With a momentum of 24,500 kg times m/sec and a velocity of 20 m/sec, the car's mass is 24,500 kg times m/sec / 20 m/sec = 1225 kg.
To find the momentum of a baseball, multiply its mass by its velocity: 0.14 kg times 30 m/sec = 4.2 kg times m/sec.
The velocity of the baseball thrown by another pitcher can be found by dividing its momentum by its mass: 2.1 kg times m/sec / 0.14 kg = 15 m/sec.
The momentum of a turtle is the product of its mass and velocity: 1 kg times 0.01 m/sec = 0.01 kg times m/sec.
True or False? When vinegar is added to baking soda, the temperature decreases slightly. This is a sign that there was a chemical reaction.
Group of answer choices
True
False
Answer:
true
Explanation:
Answer:
this would be be true but of the ingredients in it.
3. By compressing a spring, you increase its length. *
True
False
Answer:
false
Explanation:
Convection occurs when thermal energy is transferred by the movement of
Answer:
Convection is the transfer of thermal energy from one place to another by the movement of gas or liquid particles. How does this happen? As a gas or liquid is heated, the substance expands. This is because the particles in liquids and gases gain kinetic energy when they are heated and start to move faster.
Answer:
fluids
Explanation:
on edg 2021