The given statement is true ultrasonic cleaners are based on the same principle as echolocation in bats and some other animals.
What is echolocation?A physiological method for identifying far-off or unseen items (like prey) using sound waves that the objects reflect back to the source, such as a bat.
High-frequency sound waves are used in ultrasonic cleaning to scour clean objects that are submerged using liquid as a medium.
The cavitation of the solution's molecules is brought on by the high-frequency sound waves, which are generally 40 kHz in frequency.
Although bats have developed an advanced kind of echolocation that allows them to travel and find food in the dark, they have vision that is comparable to that of humans.
Bats use high frequency sound pulses emitted through their mouth or nose and listen for the echoes to achieve echolocation.
It is accurate to say that ultrasonic cleaners work on the same principles as creatures like bats and certain others that use echolocation.
Hence the given statement is true.
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Ramu,the gardener,is trying to pull out weeds. however,he has to apply great force.why do you think he has to apply to much force?
Answer:
Roots are basically hooked into the ground?
Explanation:
Maybe you could comment here the choices if it's multiple choice.
The mercury thermometer operates on the principle of
The mercury thermometer operates on the principle of dilation.
What is the working principle of a mercury thermometer?Like all liquids, mercury expands as it is heated, so it moves along the thermometer tube, determining the temperature. Its expansion rate is calibrated on the glass scale, expansion is linear and can be accurately calibrated.
Mercury allows it to be used in a thermometer by its liquid expansion fast enough to measure something so that it still maintains an accurate measurement.
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what evidence can you cite that the interstellar medium contains both gas and dust? (select all that apply.)
(a) The gas of interstellar medium can be detected from the radiations of photons of wavelength 21 cm.
(b) The gas of interstellar medium can be detected from the absorption lines present in the light from distant stars, which must be caused by a medium of density and temperature other than that of the stars emitting the lights.
What is interstellar medium?Interstellar medium is the matter and radiation that exist in the space between the star systems in a galaxy.
Evidence that interstellar medium contains both gas and dustThe gas of interstellar medium can be detected from the radiations of photons of wavelength 21 cm.The gas of interstellar medium can be detected from the absorption lines present in the light from distant stars, which must be caused by a medium of density and temperature other than that of the stars emitting the lights.Learn more about interstellar medium here: https://brainly.com/question/4173326
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Question 8 of 10
What is the equivalent resistance of the circuit?
120.0 V
OA. 40.0 2
Β. 200.0 Ω
C. 20.02
D. 80.0 2
60.002
20.0 Ω
The equivalent resistance of the circuit will be option (D) 80.0 Ω
According to Ohm's law, the voltage across two places is precisely proportional to the current flowing through a conductor between them.
The obstruction to current flow in an electrical circuit is measured by resistance. The Greek letter omega (Ω) represents the unit of measurement for resistance, known as ohms. Georg Simon Ohm is the name given to ohms.
Since in the given figure the resistance are in series so there equivalent resistance will be sum of the two resistance. If they were in parellal connection then we will add reciprocal of their resistance.
Let R1 = 60 Ω and R2 = 20 Ω. So their equivalent resistance will be as follow:
R = R1 + R2
R = 60 + 20
R = 80 Ω
Hence the equivalent resistance of the circuit will be 80 Ω
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A car is moving with constant velocity of 30m/s what is it's acceleration in 10s
Answer:
0 m/s²
Explanation:
Acceleration is defined as the rate of change of velocity:
[tex]acceleration = \frac{change \space\ in \space\ velocity}{time taken}[/tex] .
As the velocity is constant, change in velocity = 0.
∴ acceleration = 0/ 10
= 0 m/s²
the north end of a compass points towards
Opposite attract , this is the magnetic south pole
option (b) ✔
Answer:
B
Explanation:
Opposites attract......so the end of the needle pointing to the North Pole is the South pole of the magnetic needle.
Where does the halo of a galaxy expand from?
a. the local group out to the dark matter
b. the bulge out to the edge of the disk
c. the irregular cluster out to the regular cluster
d. the edge of the disk out to the bulge
The halo of galaxy expand from the bulge out to the edge of the disk. The correct option is b.
What is universe?Universe is the whole cosmic system of matter and energy. The Earth, the Sun, the Moon, the planets, the stars along with the ,dust , gases, rocks forms the universe.
It went on expanding and stretched to grow as large as possible. It is still now expanding.
The universe consist of fully dark matter, interstellar gases or dust. The This universe began with a big bang , also known as the massive explosion. This universe is still on it way of expanding more.
The formation of stellar halos occurs naturally in a cold dark matter. Universe has halos which occurs from the bottom-up or the large structure of galaxies is formed starting with small objects.
Thus, the correct option is b.
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Tatenda is making tea and
toast. He uses an 800W
toaster for 2.5 minutes and
a 2kW kettle for 5 minutes.
What is the total cost for
the energy used if
electricity costs 10p per
unit?
The total cost for the energy used if electricity costs 10p per unit is determined as 2p.
Total energy consumedThe total energy consumed during the process is calculated as follows;
E = Pt
where;
P is power (kW)t is time (hr)E = (800 W/1000) x (2.5 /60) + (2 kW) x (5/60)
E = 0.8 kW x 0.042 hr + 2kW x 0.083 hr
E = 0.0336 kW-hr + 0.166 kW-hr
E = 0.1996 kW-hr
Cost of the energy consumptionC = E x 10p
C = 0.1996 kW-hr x 10p
C = 1.996p
C ≈ 2p
Thus, the total cost for the energy used if electricity costs 10p per unit is determined as 2p.
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A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What is its volume?
Taking into account the definition of density, the volume of the metal block is 3 m³.
What is densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Volume of the metal blockIn this case, you know that:
Density= 5000 [tex]\frac{kg}{m^{3} }[/tex]Mass= 15000 kgVolume= ?Replacing in the definition of density:
[tex]5000 \frac{kg}{m^{3} } =\frac{15000 kg}{volume}[/tex]
Solving:
volume×5000 [tex]\frac{kg}{m^{3} }[/tex]= 15000 kg
volume= [tex]\frac{15000 kg}{5000 \frac{kg}{m^{3} }}[/tex]
volume= 3 m³
In summary, the volume of the metal block is 3 m³.
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define reference point
Answer:
A reference point is a place or object used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point.
Hope this helps:)
I need help!1
An ambulence is currently travelling at 15m/s and is accelerating with a constant acceleration of 5m/s^2, the ambulence is attempting to pass a car which is moving at a constant velocity of 30m/s. how far must the ambulence travel until it matches the car's velocity?
Answer:
67.5m
Explanation:
Use the kinematics equation.[tex]\frac{vf^2-vo^2}{2a} =x[/tex]
[tex]vf=30[/tex] [tex]vo=15[/tex] [tex]a=5[/tex]
[tex]\frac{30^2-15^2}{10} =x\\[/tex]
[tex]67.5=x[/tex]
Which best compares convex and concave mirrors?
Answer:
Convex mirrors produce only virtual images, and concave mirrors produce real and virtual images
Answer:
covex Miros produce different thing like micronizamm and other things
A 1.5 x 10^4 kg railroad car moving at 7m/s to the north collides with and sticks to another car of 2 x 10^4 kg that is moving in the opposite direction. What is the velocity of the 2x10^4 kg car just before the collision if their final velocity is found to be 3 m/s.
The velocity of the 2x10^4 kg car just before the collision is 0 m/s.
What is conservation of momentum principle?When two bodies of different masses move together each other and have head on collision, they travel to same or different direction after collision.
The external force is not acting here, so the initial momentum is equal to the final momentum. For inelastic collision, final velocity is the common velocity for both the bodies.
m₁u₁ +m₂u₂ =(m₁ +m₂) v
Substitute the values for m₁ = 1.5 x 10^4 kg, m₂ =2 x 10^4 kg and u₁ =7 m/s, the final velocity is 3m/s/
1.5 x 10^4 x 7+2 x 10^4 x u₂ = (1.5 x 10^4 + 2 x 10^4) x 3
u₂ = 0 m/s
So, the car with mass 2x10^4 kg is stationary.
Thus, the velocity of the 2x10^4 kg car just before the collision is 0 m/s.
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This diagram shows a wire with a current flowing through it. What do the circles and arrows around the wire represent?
A) They represent an electromagnetic field.
B) They represent an electric field.
C) They represent attraction between charged particles.
D) They represent a magnetic field.
pls the explanation of archimedes principle
Explanation:
Hello !
Archimedes' principle''states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially, is equal to the weight of the fluid that the body displaces.''
Archimedes principle equation is given as
buoyant force = density of fluid x volume of displaced fluid x acceleration due to gravity. or
Fb=-density*gravity*volume
For example, a ship that is launched sinks into the ocean until the weight of the water it displaces is just equal to its own weight.
Answer:
Archimedes principle states that"When a body is totally or partially immersed in a liquid,it experience an upthrust which is equal to the weight of the liquid displaced"
This shows that the weight of liquid displaced when a certain object is placed in water is equal to the weight of the object.
what is periscope ? where it is used?
Explanation:
The periscope is used in the submarines to see what is going on the water surface.
It is also used in some gun turrets and it is used in armed vehicles.
✨Hope it helps.✨
briefly describe how the micrometre screw gauge is used
Answer:
the micrometre screw gauge is used for making precise linear measurements (e.g to measure diameter of a wire)
When your hand presses
down on scissors, what is your
force called?
a. input force
b. output force
c. buoyant force
Answer:
INPUT force
Explanation:
You are putting force into a machine of levers to have the output of cutting something.
When your hand presses down on scissors, the force is called input force because are applying a force into an object. Thus, option a is correct.
What is force ?Force is an external agent acting on a body to deform it or to change its state from rest or motion. There are various kinds of force such as magnetic force, nuclear force, gravitational force etc.
Force is a vector quantity thus, it is characterised by a magnitude and direction. According to second law of motion, the force acting on a body is the product of mass and acceleration.
Hence, the force acting on a body is directly proportional to the mass. Greater the mass, greater will be the force needed to accelerate the body. When we press down on an object we are applying an input force to the object.
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i will give you full point and mark you as brainiest if you help me please i need it sooner.
The energy of the sun Is a response for the life on earth The planet might take a seat down withinside the liveable radius starting from 0. eighty-five AU to two AU.
Why large planets rotates faster?The large the planet quicker will be the rotation speed, and therefore shortest the time to take rotate across the axis. The large planets are exceedingly greater solid whilst as compared to the small planet system.
The hazards are
• With improved size, the quantity of gravitational enchantment posed via way of means of the planet might additionally increase. This might cause attracting outer area asteroids and consequential crater impact.
• The large the size, the farther it'd be from the big name to atone for the hydrostatic balance, hence reducing the possibilities for it being an inhabitable area.
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Emissions from alpha decay require the least amount of shielding.
Which best describes why the emissions from alpha decay are so easily blocked compared to the emissions of other types of radioactive decay?
The particles released during alpha decay are called alpha particles. Alpha particles have greater mass and charge than other emitted particles.
Radioactive emissions are the transfer of energy through the flow of particles or waves in a mediumThere are 3 types of radioactive emissions which are alpha, beta and gammaIn alpha radiation, the nucleus emits an alpha particle which is equivalent to a helium nucleusIn beta radiation, an electron is emitted to convert a neutron to a protonIn gamma radiation, the nucleus just loses energySince alpha particles have more mass and charge, they are more ionising and lose more energy at a faster rate and can be blocked easily.
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A boater is accompanied by a person at least 16 years of age. In michigan, what is the youngest age that this person can be and legally operate a boat powered by a motor of more than 35 hp?.
The youngest age that this person can be and legally operate a boat powered by a motor of more than 35 hp will be 12 years of age.
What is electric power?It is the rate of the electric work done. Its unit is the watt. Horsepower is the unit of power.
A person under the age of 12 may only legally operate a boat with a motor that has more than 6 horsepower but no more than 35 horsepower
if they meet two requirements: they have a boating safety certificate, which they must have on board; and they are being closely watched by an adult who is at least 16 years old.
Hence the youngest age that this person can be and legally operate a boat powered by a motor of more than 35 hp will be 12 years of age.
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One of the properties of alkali metals is that they don’t react with water.
Beryllium (Be) is the only alkaline earth metal that does not react with water.
What are alkali metals and their properties?
Alkali is a substance that produces hydroxide ions in aqueous solution.
PHYSICAL PROPERTIES OF ALKALIS:
Alkalis have a BITTER taste & have a SOAPY touch.Alkalis turn RED litmus paper BLUE.Alkalis have a pH value > 7.Alkalis are CAUSTIC.Alkalis CONDUCT ELECTRICITY due to the presence of MOBILE IONS in solution.CHEMICAL PROPERTIES OF ALKALI METAL
Alkalis react with Acids to form salt and water. This reaction is called neutralisation reaction.Alkalis react with ammonium salts to form salt, water and ammonia gas. .Alkalis react with solution of metal salt to form another metal salt and hydroxide.Beryllium (Be) is the only alkaline earth metal that does not react with water.
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Two cars, with the same mass and traveling at the same speed, hit large trees head-on. One car has a rigid body that undergoes little or no deformation in the collision. The other has ``crumple zones'': portions of the body designed to crumple and deform in such a collision. How does this improve the chances that the driver of the second car will survive the event
The crumple zones in the second car will improve the chance of survival of the driver because it will act as shock absorber, reducing the impact of the force on the driver.
Newton's third law of motion
According to Newton's third law of motion, action and reaction are equal and opposite.
The car with rigid body will exert maximum force to the driver while the car with crumple zone will exert lesser force to the driver since the crumple zone will act as shock absorber, reducing the impact of the force on the driver.
Thus, the crumple zones in the second car will improve the chance of survival of the driver because it will act as shock absorber, reducing the impact of the force on the driver.
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If the current in each wire is the same, which wire produces the strongest magnetic field?.
When an electromagnet has an iron core inserted, what happens to the strength of the magnet?.
Answer:
The strength of the electromagnet increases.
Explanation:
A force of 5N produces an acceleration of 8m/s2 on mass m1, and an acceleration of 24m/s2 on a mass m2. What acceleration would the same force provide if both the masses are tied together.
The acceleration that the same force will provide if both masses are tied together is; 6.0 m/s².
How to find the Acceleration?We are given;
Force; F = 5 N
Acceleration of the first mass, a₁ = 8.0 m/s²
Acceleration of the second mass, a₂ = 24 m/s²
Formula for force is;
F = ma
Let us find both masses; m₁ and m₂.
m₁ = F/a₁
m₂ = F/a₂
Thus;
m₁ = 5/8 kg
m₂ = 5/24 kg
Total mass is; m = m₁ + m₂
m = 5/8 + 5/24
m = 15 + 5/24
m = 20/24 kg
Thus, acceleration if they are both tied together is;
a = F/m
a = 5/(20/24)
a = 6.0 m/s².
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Can someone PLEASE explain:
Average velocity = u + v / 2
(How do you find the initial and the final velocity in a situation)
What is the crosswind component for a landing on runway 18 if the tower reports the wind as 220° at 30 knots?
From the head wind component charts, the crosswind component for a landing on runway 18 is 19 knots.
What is crosswind component?
When winds are not parallel to or directly with the line of travel, the wind is said to have a crosswind component.
From the head wind component charts, at 220° at 30 knots, the corresponding crosswind component is 19 knots.
Thus, from the head wind component charts, the crosswind component for a landing on runway 18 is 19 knots.
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1. A racing car moving with constant acceleration covers two successive kilometres in 30 seconds and 50 seconds respectively. find the acceleration of the car.
2. A ball is thrown vertically upwards with a velocity of 20 metre per second from the top of a multi-storey building the height of the point from where the ball is from 25 m from the ground.
The acceleration of the car is calculated as 10 m/s.
What is acceleration?The acceleration is the rate of change of velocity with time. Given that;
s = ut + 1/2 at^2
Assuming that the motion started from rest, u = 0 m/s
s = 1/2 at^2
2000 = 0.5 * a * (20)^2
a = 2000/ 0.5 * (20)^2
a = 10 m/s^2
2) The time taken to reach the maximum height is gotten from;
v=u+at
0=20+(−10)t
t=2s
Then time taken to reach the maximum height;
s = ut + 1/2 at^2
s = 20(2)+0.5(−10)(2)^2
s = 20m
The maximum height is therefore 45 m thus;
45=0+0.5(10)(t)^2
t = 3s
Total time= 3+2= 5s
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acceleration = a
1000 = u(30) + 0.5a(30)²
1000 = 30u + 450a
velocity after covering 1 km = u + 30a
1000= (u+30a) (20) + 0.5a (20)²
1000= 20u + 800a
u = 35a
putting the value of u in above equation
so, a = 2/3
2. refer to the above attachment
The data table shows how the amplitude of a mechanical wave varies with the energy it carries. Analyze the data to identify the mathematical relationship between amplitude and energy. Use your equation to find the energy if the amplitude is 6 units. Amplitude Energy 1 unit 2 units 2 units 8 units 3 units 18 units 4 units 32 units A. 66 units B. 60 units C. 72 units D. 74 units
The energy of a wave is directly proportional to the square of the amplitude of the wave.
What is the relationship between energy and amplitude?There is direct relationship between energy of the wave and the amplitude of the wave. The energy transported by a wave is directly proportional to the square of the amplitude of the wave. This means if energy is increase the amplitude of wave becomes double and vice versa.
Energy = (amplitude)2
So we can conclude that the energy of a wave is directly proportional to the square of the amplitude of the wave.
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[tex]Energy = (amplitude)^{2}[/tex]
What is energy and amplitude?Energy is define as the capacity for doing work.
Amplitude is the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position.
So , the relationship between energy of the wave and the amplitude of the wave is described as the energy transported by a wave is directly proportional to the square of the amplitude of the wave.
Here , If energy is increase the amplitude of wave becomes double.
[tex]Energy = (amplitude)^{2}[/tex]
Hence , the energy of a wave is directly proportional to the square of the amplitude of the wave.
By using the above equation if the amplitude is 6 Units then :
Energy = [tex](6)^{2}[/tex] = 36 units
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