Answer:
yeah physical quantities are the quantities which can be meaured
What happens when electromagnetic waves cause a disturbance in electric and magnetic fields?
A. Any particles in the fields move with them.
B. They cancel vibrations in electric and magnetic fields.
C. The electromagnetic waves transfer energy.
D. The fields line up parallel to each other.
Answer:
The answer is C. The electromagnetic waves transfer energy.
The electromagnetic waves cause a disturbance in the electric and magnetic field as the electromagnetic waves transfer energy. Thus, the correct option is C.
What are electromagnetic waves?The electromagnetic radiation (EMR) consists of waves of the electromagnetic (EM) field. These waves propagate through space and carry momentum and electromagnetic radiant energy as well. It includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. All of these waves form together different parts of the electromagnetic spectrum.
Electromagnetic waves or the EM waves are waves which are created as a result of vibrations between an electric field and a magnetic field. Electromagnetic waves are composed of oscillating magnetic and electric field lines and transmit energy.
Therefore, the correct option is C.
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Kundan who weighs 200N and bijaya who weighs 500N are playing sea saw.If Bijaya is 1m away from the fulcrum,how far should kundan sit to lift bijaya
Answer:
Kundan should sit at more that 2.5 meters from the location of the fulcrum on the side opposite to the side where Bijaya sits
Explanation:
The given parameters are;
The weight of Kundan, F₁ = 200 N
The weight of Bijaya, F₂ = 500 N
The distance of Bijaya from the fulcrum, d₂ = 1 m
Therefore, for Kundan to lift Bijaya, Kundan should sit at a location further than the point where both the moment of Bijaya and Kundan about the fulcrum are equal
Moment of a force, M = The magnitude of the force, F × The perpendicular distance to the point at which the force acts, d
At equilibrium, the sum of the clockwise moment = The sum of the anticlockwise moment
Taking the moment of Kundan as being in the anticlockwise direction and the moment of Bijaya as acting in the clockwise direction, we have;
F₁ × d₁ = F₂ × d₂
∴ 200 N × d₁ = 500 N × 1 m
d₁ = 500 N·m/(200 N) = 2.5 m
Therefore, when Kundan sits at the point d₁ = 2.5 m, away from the fulcrum on one side of the sea saw and Bijaya sits at the point 1 m from the fulcrum on the other side of the sea saw, both Kundan and Bijaya will have the same moment
For Kundan to lift Bijaya, therefore, Kundan as to sit at a point further than 2.5 m from the fulcrum on the opposite side of the fulcrum from Bijaya.
A powered winch is used to pull a sailboat to shore. The winch uses a 900 W motor. If the motor is used for 30 s, how much work does it do? (Power: P = W/t)
Answer:
they have given us
power = 900W
time = 30s
[tex]p = \frac{wd}{t} \\ p \times t = wd \\ 900 \times 30 = w.d \\ 27000j[/tex]
Answer: 27,000 J
Explanation:
Kai swims for the school swim team. He specializes in backstroke event where he has to swim the 50-m length of the pool three times. find distance and displacement
Answer:
150
Explanation:
50x3
I'm sorry I'm not smart
Answer:
distance = 150
displacement = 50
Dogs are able to hear much higher frequencies then humans are capable of detecting. For this reason the crystals that are inaudible to the human ear can be heard easily by a dog. If a dog whistle has a frequency of 3.0 x 10^4 Hz, what is the wavelength of the sound emitted?
Answer:
Dogs are able to hear much higher frequencies than humans are capable of detecting. For this reason, dog whistles that are inaudible to the human ear can be heard easily by a dog. If a dog whistle has a frequency of 30,000 Hz, what is the wavelength of the sound emitted?
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Comes with no word bank btw
Answer:
When an object applies a force on another object, the second object applies a force of the SAME amount/magnitude on the first object, but the force is in the opposite direction.
I tried 1760km but it says it’s wrong
Answer:
hmmmm
Explanation:
Light travels at a constant 3.0x10^8m/s.
If the moon is 3.84x108 meters from the earth, how much time would it take the light from the moon to reach the earth?
Answer:
mulitipy the numbers and u will get the answer!!
On a sunny day, a student poured a cup of water on the sidewalk to make a puddle. When he returned later, the puddle was gone. The student concluded that the puddle was gone because the water soaked into the sidewalk. 1. What would you say to this student about this conclusion? 2. What could you do to demonstrate your idea about where the water went? Text EntryMedia Copy and paste or type your submission right here.
Answer:
The students conclusion is wrong.
Explanation:
The students conclusion is wrong because liquids can not soak into concrete. The water evaporated because it was a hot sunny day. The water turned into a gas called water vapor.
Which statement about the Law of Conservation of Mass is NOT true? A. Although the molecular makeup of molecules may change, the atoms are not lost. B. Matter is neither created nor destroyed during a chemical change. C. Chemical reactions create new atoms, which will increase the mass of the substance.
Answer:
C. Chemical reactions create new atoms, which will increase the mass of the substance.
Explanation:
It is not true that according to the Law of conservation of mass that mass of the substance will increase during chemical reactions.
During a chemical reaction, new atoms are not being created. The atoms of the reactant simply recombines to given a different product or compound. The atoms are still the same only the compound or product form differs.
According to the law of conservation of mass "in a chemical change, matter is neither created nor destroyed but bonds are broken and atoms combine".
By virtue of this, chemical reactions conserves mass so that the mass we start with is the same we end with since no new matter is destroyed nor created.
the sound absorber is kept at the wall of cinema hall why
Answer:
because it causes echoes walls are good reflectors of sound
Explanation:
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Carbon-14 is the typical radioisotope used to date materials; however, it has a limitation to 40,000 years. A scientist who wants to date materials older than 40,000 years would most likely use which radioisotope? uranium-238 rubidium-91 iodine-131 cobalt-60
Answer:
the only one of these materials that allows studying processes of a very long period of time is Uranium 238
Explanation:
In a radioactive material, half of the atoms decay each life period, in carbon 14 this period T = 5730 years, so for a time of 40,000 years there are 7 life periods, so there are very few atoms left without decomposing .
To study older samples, materials with a longer life period are needed, let's show the visa time
²³⁸U T= 4.5 10¹⁰ years
⁹¹Rb T = 58 s
¹³¹I T= 8.04 days
⁶⁰Co T= 5.27 years
Therefore, the only one of these materials that allows studying processes of a very long period of time is Uranium 238
Answer:
A) Uranium-238 is the correct answer.
The number of waves that pass a certain point in a given amount of time.
Group of answer choices
Frequency
Wavelength
Wave
Reflect
2. If a bowling ball has a momentum of 72.5 kg m/s and has a speed of 11.2 m/s as it moves
down the lane, what is the mass of the ball?
mass= momentum ÷ velocity
72.5 ÷ 11.2= 6.5kg
A flowing stream contains water that is 18 degrees Celsius. Cans of soft drinks at 28 degrees Celsius are lowered into the stream. Which of the following will most likely occur?
a The soft drinks will absorb cold energy from the stream's water.
b The soft drinks will not change temperature since they are sealed.
c The cans will cool until they are the same temperature as the stream.
d The temperature of the cans will decrease to freezing as long as the stream is flowing.
Answer:
Explanation:
c
What was the average speed of the student from 0 to 5 seconds?
Answer:
10 average speed seconds
Type of mirror used as a side mirror on a vehicle to provide a wide angle view...
Answer:
yes done first thing tomorrow
Answer:
convex mirror is used in vehicle to provide a wide angle view
9. Luke is an astronaut that moves his position in the space shuttle by climbing a
3.0 m ladder in 5.0 seconds at Cape Kennedy (g = 9.8 m/s^2). After landing on the
moon (g = 1.6 m/s^2), Luke climbs a 3.0 m ladder in 5.0 seconds to begin the trip back to Earth. Is more power expended by the astronaut on Earth or on the moon, and by what factor?
Explanation:
Remember that power is defined as how much Work is done per unit of time.
[tex]P = \frac{dW}{dt}[/tex]
Work is defined as the amount of force applied across a certain distance.
[tex]W = F*d[/tex]
Since in both cases of climbing the ladder (on Earth and the moon), Luke coveres the same amount of distance in the same amount of time, we are only left with one difference between the two cases - gravity.
If you were to carry your backpack on the moon with the same load of text books, it would take less force to pick it up on the moon. Therefore, Luke expends less effort on the environment with less gravity - the moon.
To find the difference factor - you would want to divid the gravitational contants between earth and the moon.
Answer:
It takes 6.125 times as much work on Earth as it does on the moon.
Explanation:
Formulas
The power formula is
P = Work / Time
Work = Force * distance
Givens
d = 3.0 meters
t = 5.0 seconds
g = 9.8 m/s^2 on earth
g = 1.8 m/s^2 on the moon
Solution
Earth
Work = F * d
Work = m* a * 3.0 m
Work = m *9.8 * 3.0
Work = m * 29.4
Power = (Work * 29.4)/5
Power = 29.4/5 * m
Power = 5.88 watts.
Moon
You follow the same procedure except you use 1.6 for a.
Work = m * 1.6 * 3
Work = 4.8*m Joules
Power = 4.8 * m/ 5
Power = 0.96 * m Watts
P_earth/Power_moon = 5.88 * m / 0.96 * m = 6.125
Power =
Calculate the efficiency of a hair dryer which takes in 4500J of energy per second and transfers 150J as useful heat energy.
Answer:
η = 0.0333 = 3.33 %
Explanation:
The efficiency of any device is defined as the ratio of the useful output obtained from that device to the input required by the device. Therefore, the general formula to find the efficiency of any device is given as follows:
[tex]\eta = \frac{O}{I}[/tex]
where,
η = efficiency of hair dryer = ?
O = Useful Output Given by the Hair Dryer = 150 J
I = Input Energy Required by the Hair Dryer = 4500 J
Therefore,
[tex]\eta = \frac{150\ J}{4500\ J}\\[/tex]
η = 0.0333 = 3.33 %
What is the velocity of a Usain Bolt if he runs 200 m in 10 seconds?
Answer:
20m/s
Explanation:
Given parameters:
Displacement = 200m
Time = 10s
Unknown:
Velocity of Usain Bolt = ?
Solution:
The velocity of a body is the displacement divided by the time taken.
Therefore
Velocity = [tex]\frac{displacement}{time}[/tex]
So;
Velocity = [tex]\frac{200}{10}[/tex] = 20m/s
What is 2/9 divided by 4
Answer:
1/12
Explanation:
[tex]\frac{2}{9}[/tex]÷[tex]\frac{4}{1}[/tex]
Cross multiply
[tex]\frac{2}{9}[/tex]×[tex]\frac{1}{4}[/tex]
=[tex]\frac{3}{36}[/tex] then simplify to 1/12
a light bulb with a resistance of 2.0 ohms is connected to a 1.5 v battery. what is the current in the circuit?
Explanation:
I= V/R V = 1.5v R = 2 ohm I =1.5/2 = 1.5×10/2×10 =15 / 20 =3/4 I = 0.75 ATaking into account the Ohm's Law, the current in the circuit is 0.75 amperes.
The basic relationships of the intensity of the current, voltage and resistance are as follows:
The current intensity of a circuit increases when the voltage is increased without varying the resistance. The current intensity of a circuit decreases when resistance is increased without varying the voltage.These two relationships constitute Ohm's Law. So, Ohm's law is the relationship between electrical conductors and their resistance, which establishes that the current that passes through the conductors is proportional to the voltage applied to them.
Ohm's law expressed mathematically is:
V = R×I
where:
V is the electric potential in voltsI is the current in amperesR is the resistance in ohms.In this case, you know:
V= 1.5 voltsR= 2 ohmsI= ?Replacing:
1.5 volts= 2 ohms* I
Solving:
I= 1.5 volts ÷2 ohms
I= 0.75 amperes
In summary, the current in the circuit is 0.75 amperes.
Learn more about Ohm's law:
https://brainly.com/question/12372387?referrer=searchResultshttps://brainly.com/question/11420583?referrer=searchResultshttps://brainly.com/question/796939?referrer=searchResultsHow long will it take a - 1.26 * 10 ^ 4 force to stop a 2.30 * 10 ^ 3 truck moving at a speed of 22.2 m/s?
Answer:
4.1s
Explanation:
Given parameters:
Force applied = 1.26 x 10⁴ N
Mass of the truck = 2.3 x 10³kg
Speed of the truck = 22.2m/s
Unknown:
The time it will take to stop the truck = ?
Solution:
To solve this problem, we must understand that the momentum must be conserved.
So;
Momentum of the truck = Impulse applied on it
mass x velocity = Force x time taken
So;
Time taken = [tex]\frac{nass x velocity }{force }[/tex] = [tex]\frac{2300 x 22.2 }{12600}[/tex] = 4.1s
A train moves from rest to a speed of 25 m/s in 30.0 seconds. What is the acceleration?
Answer:
[tex]a = 0.83\ m/s^2[/tex]
Explanation:
Uniform Acceleration
When an object changes its velocity at the same rate, the acceleration is constant.
The relation between the initial and final speeds is:
[tex]v_f=v_o+a.t[/tex]
Where:
vf = Final speed
vo = Initial speed
a = Constant acceleration
t = Elapsed time
It's known a train moves from rest (vo=0) to a speed of vf=25 m/s in t=30 seconds. It's required to calculate the acceleration.
Solving for a:
[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]
Substituting:
[tex]\displaystyle a=\frac{25-0}{30}[/tex]
[tex]\boxed{a = 0.83\ m/s^2}[/tex]
true or false
the faster an object moves, the greater its potential energy?
Answer:
true
Explanation:
Because the more mass you have, the faster the speed and the greater its potential energy, which is a storage energy.
Raul is riding on a train that is moving at a speed of 20.0 meters per second. Kirstin is sitting across from him, and there is a distance of 1.8 meters between them. If Raul and Kirstin do not leave their seats, which of the following graphs shows the distance from Raul to Kirstin over the first 6 seconds of the trip?
Answer:
C
Explanation: Study Island
Answer:
The Straight Line Graph
Explanation:
Radiation transfers thermal energy through_________. Which accurately complete the statement waves direct contact of particles in liquid moment
Answer:
waves
Explanation:
There are three major ways in which heat or thermal energy is transferred namely: conduction, convection and radiation. Please find the description of each below;
- Conduction is the method of heat transfer which involves a physical contact between the substances involved.
- Convection, on the contrary, occurs via a liquid medium
- RADIATION is a method of heat transfer which involves neither physical contact or liquid medium (matter) but occurs through WAVES e.g electromagnetic waves. For example, the sun transfers heat to the Earth via RADIATION.
Radiation transfers thermal energy through electromagnetic waves.
When it comes to transferring thermal energy, there are three primary methods:
Conduction: This involves the direct contact and transfer of heat between particles of a solid material.
Convection: This occurs in fluids (liquids and gases) when heated particles move and carry thermal energy with them.
Radiation: This method does not require any medium or direct contact. Instead, thermal energy is transferred through electromagnetic waves, such as infrared radiation, which can travel through a vacuum or transparent medium (like air).
Hence, the complete statement would be: "Radiation transfers thermal energy through electromagnetic waves, without the need for direct contact of particles or a medium."
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Particulate Motion Unit Test Part 2
1. A gas leak where methane gas combines with oxygen in the air can start a fire, releasing its energy at ignition temperature.
What does the ignition have to do with this chemical reaction?
(1 point)
The ignition provides the energy to break the bonds in molecules and start the reaction.
The ignition adds more atoms to increase its energy during the reaction.
The ignition targets methane gas only and releases oxygen before the fire.
The ignition forces atoms to combine and start a reaction.
2.
Particulate Motion Unit Test
10 of 16Items
Item 10
Gasoline has various chemicals that contain large amounts of chemical potential energy that is released when burned in a car engine.
What happens to the energy produced by burning gasoline in a car engine?
(1 point)
The energy multiplies to keep the engine running.
Some of the energy is lost as heat.
None of the energy is transformed but is sustained as work to run the engine.
The energy released is less than the energy absorbed by the molecules.
3. The reaction between methane gas and oxygen to produce carbon dioxide and water is an exothermic process. Which statement describes the energy in the system?(1 point)
The chemical energy of the reactants is greater than the chemical energy of the products. Energy is absorbed from the surroundings.
The chemical energy of the reactants is greater than the chemical energy of the products. Energy is released to the surroundings.
The chemical energy of the reactants is less than the chemical energy of the products. Energy is released to the surroundings.
The chemical energy of the reactants is less than the chemical energy of the products. Energy is absorbed from the surroundings.
4. How does the energy in the light of the aurora borealis compare to the energy as an excited electron returns to its original energy level?(1 point)
half of the energy
one-third of the energy
equal to
twice the energy
5. A solar flare causes the sun to release a large number of particles along with excess amounts of electromagnetic radiation. Which helps prevent this radiation from harming Earth’s living organisms?(1 point)
Earth’s magnetic field absorbs most of this radiation.
Earth’s magnetic field deflects most of this radiation.
Satellites directly deflect most of this radiation.
Satellites indirectly absorb most of this radiation.
6. Several energy transfers occur during the process of the aurora borealis. During which transfer is the energy the greatest?(1 point)
Energy is the same at each step.
Electrons from the sun transfer energy to atoms in the atmosphere.
Electrons fall and release energy as light.
Electrons in the atoms jump to a higher energy level.
7. Develop a model and use it to explain in 3–4 sentences why a person feels cold when rubbing alcohol is applied to skin. (4 points)
8. Using the concepts of macroscopic and molecular scales of energy, describe in 1–2 sentences how the heating element of a toaster works.(2 points)
Explanation:
The ignition provides the energy to break the bonds in molecules and start the reactionThe energy multiplies to keep the engine runningThe chemical energy of the reactants is greater than the chemical energy of the products. Energy is released to the surroundings.twice the energyEarth’s magnetic field deflects most of this radiation.Electrons in the atoms jump to a higher energy level.it is because alcohol i.look on photo. look it upIn the lab, You have a highly reactive metal like sodium. It is so reactive that water sets it off. How would you store it?
Answer:
Sodium is stored under paraffin oil
Explanation:
Group 1 metals are known to be very highly reactive. The chemical reactivity of the members of the group decreases down the group.
Sodium reacts violently with water and upon exposure to the atmosphere. As a result of this, it must be stored under paraffin oil.
list three factors that affect the rate of losing or gaining heat energy through radiation.
Answer:
Atmospheric temperature
The temperature of the atmosphere plays a major role in the heat loss during radiation, if the atmospheric temperature is lower than the radiating temperature then some of the heat is rejected to the atmosphere.
2.Ground surface reflectivity.
This indicates that how much of the rays are reflected from the ground,Metal surfaces, concrete and beach sand can all reflect UV ,while some surfaces do not.The more is the reflection the more will be the intensity of radiation.
3.Presence of pollutants in the atmosphere
Presence of impurities in the atmosphere can become an obstacle in the way of radiation,as rays after striking particles of impurity may get reflected or refracted depending upon the type of impurity present.
