Answer:
a.) having long wavelengths
Explanation:
Radio waves can be defined as an electromagnetic wave that has its frequency ranging from 30 GHz to 300 GHz and its wavelength between 1mm and 3000m. Therefore, radio waves are a series of repetitive valleys and peaks that are typically characterized of having the longest wavelength in the electromagnetic spectrum.
Basically, as a result of radio waves having long wavelengths, they are mainly used in long-distance communications such as the carriage and transmission of data. Some examples of communication technologies that uses radio waves are radio set, mobile phones, television etc.
Hence, the property which makes radio waves ideal for carrying and transmitting data is that, it is having long wavelengths.
Answer:
A. having long wavelengths
Explanation:
Do this work if someone give correct answer I make her brainliest do this worksheet please
Sry,I only know the answer of q2
Chlorine is a non metal because it is bad conductor of heat and sodium is a metal because it is good conductor of heat.
The 3 ways in which metal is different from non metal are given below:
1)metal are good conductor of heat but nonmetal are bad conductor of heat.
2)metals are malleable but non metal aren't malleable.
3)metals are generally ductile but non metal aren't ductile.
Hope it will helpyou!
Answer:
Explanation:Chlorine is a non metal because it is bad conductor of heat and sodium is a metal because it is good conductor of heat.
The 3 ways in which metal is different from non metal are given below:
1)metal are good conductor of heat but nonmetal are bad conductor of heat.
2)metals are malleable but non metal aren't malleable.
3)metals are generally ductile but non metal aren't ductile
The moon has approximately 1/6th the
gravitational pull that the earth has. If something
has a mass of 60kg on Earth, what is its mass on
the moon?
Answer:
m = 60 [kg] (mass on the moon)
Explanation:
We must remember that the mass is conserved, that is, it remains the same regardless of where it is located.
The only variation is the weight, which is different from the mass. Weight is determined by means of the product of mass by gravitational acceleration.
Therefore the mass of 60 [kg] on Earth will be the same mass on the moon.
The vocal cords in your throat _____________.
collapse
vibrate
compress
Answer:
vibrate
Explanation:
Vocal folds vibrate when excited by aerodynamic phenomena; they are not plucked like a guitar string. Air pressure from the lungs controls the open phase. The passing air column creates a trailing “Bernoulli effect,” which controls the close phase.
hope it helps!!
Which phrase describes blackbody radiation?
O A. Radiation that is absorbed by an object as it warms
O B. Light given off by an object based on its temperature
O C. Radiation that explains the wave model of light
O D. Light given off by an object based on its color
Answer:
b
Explanation:
The phrase that describes blackbody radiation is the radiation that is absorbed by an object as it warms.
What is blackbody radiation?Blackbody radiation is a radiation produced by heated objects, particularly from a blackbody.
In physics, a blackbody, approximated by a hole in a hollow black sphere, absorbs all incident electromagnetic radiation and reflects none.
Therefore, the phrase that describes blackbody radiation is the radiation that is absorbed by an object as it warms.
Learn more about blackbody radiation at: https://brainly.com/question/13934832
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A car is stopped for a traffic signal. When the light turns green, the car accelerates, increasing its speed from zero to 5.27 m/s in 0.833 s. What linear impulse and average force does a 69.8 kg passenger in the car experience
Answer:
See explanation
Explanation:
From Newton's law; the rate of change of momentum is proportional to the impressed force. Hence;
F.t = mv- mu
F= force
t= time
m= mass
V= final velocity
u = initial velocity
since u = 0, mv= 0
F= MV/t
F= 69.8 × 5.27/0.833
F= 442 N
Impulse = Ft= 442 × 0.833= 368 Ns
If the scale model works as predicted, the final product is guaranteed to be flawless.
•True
•False
Answer: true
Explanation:
If the scale model was working as it was predicted to work, then the final product is expected to be flawless. It should be a reasonable product if the scale model is working. Our answer is the option True.
Which of these best defend defines whethera atomic fear contains over 30-year period b day-to-day conditions with the weather see long-term conditions of the atmosphere and the average
Answer: Climate
Explanation:
The climate is the constant condition of the atmosphere of a particular condition for a period of 30 years. It consider atmosphere for relatively long periods of time.
The averages of precipitation, humidity, wind speed, temperature, rainfall are considered while knowing the status of climate of a particular region or location. Other parameters like fog, hail storms, and frost are also measured.
The temperature of boiling water cannot be measured by alcohol
thermometer.
Answer:
It can be measured by using laboratory thermometer.
When a 54.9-g tennis ball is served, it accelerates from rest to a speed of 45.1 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 35.1 cm. What is the magnitude of the net force acting on the ball
Answer:
F = 159.07 N
Explanation:
Given that,
Mass of a tennis ball, m = 54.9 g = 0.0549 kg
It accelerates from rest to a speed of 45.1 m/s.
The impact with the racket gives the ball a constant acceleration over a distance of 35.1 cm = 0.351 m
We need to find the magnitude of net force acting on the ball.
Let a be the acceleration of the ball. Using third equation of motion to find it.
[tex]v^2-u^2=2ad\\\\a=\dfrac{v^2-u^2}{2d}\\\\a=\dfrac{(45.1)^2-(0)^2}{2\times 0.351}\\\\=2897.45\ m/s^2[/tex]
Net force,
F = ma
F = 0.0549 kg × 2897.45 m/s²
= 159.07 N
Hence, the net force acting on the ball is 159.07 N.
1
Suppose you ride a bicycle around the block, returning to your starting point.
At the end of your trip, your average velocity will be ..........
Positive
Negative
Zero
Answer:
zero
Explanation:
this is the answer
Choose the sequence of energy forms that best fits each item.
Answer:
1. chemical energy --> electrical energy --> light energy
2. Electrical Energy --> Mechanical Energy
3. Electrical Energy --> Heat Energy
4. Chemical Energy --> Thermal Energy --> Mechanical Energy
5. Nuclear Energy --> Light energy and thermal energy
6. Mechanical Energy --> Electric Energy
7. Chemical Energy --> Electrical Energy --> Sound Energy
8. Mechanical Energy --> Sound Energy
Explanation:
1.FLASHLIGHT:
chemical energy --> electrical energy --> light energy
The chemical energy from the cell batteries is converted to electrical energy, which is used to produce the light energy in form of flashlight.
2.ELECTRIC SAW:
Electrical Energy --> Mechanical Energy
The electrical energy from the socket is converted to the mechanical energy used to run the saw blade.
3.TOASTER:
Electrical Energy --> Heat Energy
The electrical energy from the socket is converted to the heat energy (thermal energy) used in browning the bread.
4.GAS POWERED SCOOTER:
Chemical Energy --> Thermal Energy --> Mechanical Energy
The chemical energy from fuel, such as petrol is converted to heat (thermal energy) in the engine by the process of combustion. This heat is then used to do work by conversion into mechanical energy, through piston movement, which in turn moves the shaft and the scooter.
5.THE SUN:
Nuclear Energy --> Light energy and thermal energy
The nuclear reactions on Sun provide nuclear energy which is converted into light and thermal energy that reaches us on earth.
6.WIND TURBINE:
Mechanical Energy --> Electric Energy
The mechanical energy is provided by wind when it rotates the blade of turbine. This is then converted to electrical energy b the turbine.
7.IPOD:
Chemical Energy --> Electrical Energy --> Sound Energy
The chemical energy i supplied by the battery of ipod, which is converted to electrical energy and that electrical energy is used to produce sound by ipod.
8.SPEAKER VIBRATES
Mechanical Energy --> Sound Energy
The mechanical energy due to vibration produces sound energy.
Answer:
1. chemical energy --> electrical energy --> light energy
2. Electrical Energy --> Mechanical Energy
3. Electrical Energy --> Heat Energy
4. Chemical Energy --> Thermal Energy --> Mechanical Energy
5. Nuclear Energy --> Light energy and thermal energy
6. Mechanical Energy --> Electric Energy
7. Chemical Energy --> Electrical Energy --> Sound Energy
8. Mechanical Energy --> Sound Energy
Explanation:
A girl delivering newspapers covers her route by traveling 3.00 blocks west, 4.00 blocks north, and then 6.00 blocks east. What is the total distance she travels?
Answer:
13 blocks
Explanation:
The total distance the student travels is 13 blocks.
Distance is the length of path covered during the motion of a body.
To find distance:
Total distance = Number of blocks to the west + number of blocks to the north + number of blocks to the east
Total distance = 3blocks + 4blocks + 6blocks = 13blocks
the great pyramid of khufu (giza, egypt) is about 140m tall. How much work would be required to raise an average - sized pyramid black (2.5 tons) to this height?
reaction takes place that is expected to yield 171.9 g of product, but only yields 154.8 g. What is the percent error for this experiment?
Answer:
9.95 percent
Explanation:
To get the percentage error, we use the following formula:
Percentage error = (expected output- actual output)/expected output X 100
Where
expected output: This is the mass of the end product after the chemical reaction that was expected = 171.9g
actual output: This is the mass of the end product after the chemical reaction that was observed = 154.8 g
Percentage error = [tex]\frac{171.9-154.8}{171.9} X 100= 9.95 percent[/tex]
Therefore the percentage error in the experiment is 9.95 percent.
The percent error for this experiment in which the reaction takes place to yield 171.9 g of product is 9.95%.
What is percentage of error?The difference between the measured or calculated value during the experiment or calculating and the known value is called the error. The percentage of error is the 100 times of this difference when divided with known value.
The expected value of the reaction to yield is 171.9 g of product. The experimental value of the reaction to yields is 154.8 g of product.
Thus, the percent error for this experiment
[tex]P=\left(\dfrac{171.9-154.8}{171.9}\right)\times100\\P=9.95\%[/tex]
Thus, the percent error for this experiment in which the reaction takes place to yield 171.9 g of product is 9.95%.
Learn more about the percentage of error here;
https://brainly.com/question/10218601
b. The coefficient of friction between the tires and the road is 0.850 and the mass of the car is
1.35x10' kg. Draw the free body diagram of this situation and determine the applied force
that caused the acceleration from part a. (2 law: Fnet-ma)
Given:
u
בנו
Samt
g=9.8 m/s^2
am
(from part a)
Unknown:
Fapp = ?
Equation:
Fnet=ma
Fapp- umg=ma
Solution:
Answer:
156.26N
Explanation:
The data needed are incomplete. Let the acceleration of the body be 3.5m/s²
Other given parameters
Mass = 1.35×10^1 = 13.5kg
coefficient of friction between the tires and the road = 0.850
Acceleration due to gravity = 9.8m/s²
According to Newton's second law:
Fnet = ma
Fnet = Fapp - Ff
Fapp is the applied force
Ff is the frictional force = umg
The equation becomes:
Fapp - Ff = ma
Fapp-umg = ma
Fapp - 0.85(13.5)(9.8) = 13.5(3.5)
Fapp - 109.0125 = 47.25
Fapp = 47.25+109.0125
Fapp = 156.2625N
Hence the applied force that caused the acceleration is 156.26N
Note that the acceleration of the car was assumed. Any value of acceleration can be used for the calculation.
How does a single fixed pulley, like the one seen here, help you do work?
A) Changes the direction of the force.
B) Increases the amount of applied force.
C) Decreases the amount of applied force.
D) Allows you to pull the rope a shorter distance.
Answer:
the answer will be B
Explanation:
because you are pulling the rope, pullimg applies FORCE. the bucket goes up because you applied FORCE
A light bounces off the surface of a metal cup and shines in Harold’s eyes. Which best describes what is happening to the light waves in this scenario?
absorption
interference
refraction
reflection
Answer:
Reflection
Explanation:
Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound, and water waves.
Answer:
d
Explanation:
How much work is it to lift a 2.0 kg sack of potatoes vertically 6.5 m?
Answer:
Therefore, the work done to lift a 20 kg sack of potatoes of potatoes vertically 6.5 m is 1, 274 J.
A tourist stands at the top of the Grand Canyon, holding a rock, overlooking the valley below. Find the final velocity, and displacement of the rock after 4.0 seconds give the three initial conditions listed below.
a. The rock is dropped vertically from rest
b. The rock is tossed vertically upward with 8.0 m/s of speed
c. The rock is tossed vertically downward with 8.0 m/s of speed TV TV
Answer:
a. Vf = 39.24 [m/s]
b. Vf = 31.24 [m/s]
c. Vf = 47.24 [m/s].
Explanation:
To solve this problem we can use the following equation of kinematics. We have to keep in mind that the gravitational acceleration acts downwards, therefore when the rock falls towards the abyss it has the same direction of the acceleration and that is why the gravitational acceleration has a positive sign in the equation.
[tex]v_{f}=v_{o}+g*t[/tex]
where:
Vf = final velocity [m/s]
Vo = initial velocity = 0 (when the rock is dropped)
g = gravitational acceleration = 9.81 [m/s²]
t = time = 4 [s]
a.
[tex]v_{f}=0+9.81*4\\v_{f}= 39.24 [m/s][/tex]
b.
In this particular situation, the acceleration will be taken as negative because the gravity is pointing in the opposite direction of the movement of the rock.
[tex]v_{f}=8-(9.81*4)\\v_{f}=-31.24[m/s][/tex]
The negative sign in the answer tells us that the rock no longer moves up instead it does downwards when 4 seconds have passed.
c.
[tex]v_{f}=8+(9.81*4)\\v_{f}=47.24[m/s][/tex]
convert one mean solar day into second
Answer:
86400 seconds
Explanation:
To convert a mean solar day to second :
Number of hours in a solar day = 24 hours
Number of minutes per hour = 60 minutes
Number of seconds per minute = 60 minutes
Hence, the number of seconds in a solar day is :
(Number of hours in a solar day * number of minutes in an hour * number of seconds in a minute)
(24 * 60 * 60) seconds = 86400 seconds
Hence, 1 mean solar day = 86400 seconds
Explain how to change the pitch of the sound produced by a violin string when it is plucked or rubbed with the bow.
Answer:
Sound is produced by moving the bow over the string or by plucking it with the right hand. Pitch alterations are achieved by pressing down the string with the fingertips of the left hand on the fingerboard. This shortens the vibrating portion of the string and raises the pitch
Explanation:
A student is watching a video in order to understand how convection in the mantle of the Earth occurs. The video shows rock rising and sinking to make convection currents in the mantle. Which process is responsible for causing rock to rise? A. Rock is heated. B. Rock rapidly cools off. C. Rock increases in density. D. Rock undergoes intense pressure.
Answer:
A
Explanation:
Because of the convectional currents
A man is standing on the edge of a 20.0 m high cliff. He throws a rock horizontally with an initial velocity of 10.0 m/s.
a. How long does it take to reach the ground?
b. How far does the rock land from the base of the cliff?
Answer:
a. The rock takes 2.02 seconds to hit the ground
b. The rock lands at 20,2 m from the base of the cliff
Explanation:
Horizontal motion occurs when an object is thrown horizontally with an initial speed v from a height h above the ground. When it happens, the object moves through a curved path determined by gravity until it hits the ground.
The time taken by the object to hit the ground is calculated by:
[tex]\displaystyle t=\sqrt{\frac{2h}{g}}[/tex]
The range is defined as the maximum horizontal distance traveled by the object and it can be calculated as follows:
[tex]\displaystyle d=v.t[/tex]
The man is standing on the edge of the h=20 m cliff and throws a rock with a horizontal speed of v=10 m/s.
a,
The time taken by the rock to reach the ground is:
[tex]\displaystyle t=\sqrt{\frac{2*20}{9.8}}[/tex]
[tex]\displaystyle t=\sqrt{4.0816}[/tex]
t = 2.02 s
The rock takes 2.02 seconds to hit the ground
b.
The range is calculated now:
[tex]\displaystyle d=10\cdot 2.02[/tex]
d = 20.2 m
The rock lands at 20,2 m from the base of the cliff
If a net force of 375N is acting on a crate and there is 65N of friction
created, what is the magnitude net force the crate experiences?
375N
65N
310N
440N
Answer:
310 N
Explanation:
The net force, I assume, is an applied force that is causing motion of the crate. However, frictional force opposes this motion, so the frictional force is in the opposite direction. Overall, we can create a net force equation of this crate as
Fnet= Force applied + Force of friction
Thus,
Fnet= 375N -65N (because friction is in the opposite direction)
Then solve to get that the net force while the crate is in motion is 310N.
A cello string is 0.695 m long, and transmits waves at 204 m/s. What frequency does it produce? (Unit = Hz)
Answer:
ν=293.53 Hz
Explanation:
ν= speed/λ
speed = 204 m/s
λ=0.695 m
v = 204 m/s * 1/0.695m
meters cancels out
1/s = Hz
v = 204/0.695 Hz
ν=293.53 Hz
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apparently it is wrong, but my work and online calculator says otherwise... possibly round your answer? I'm not sure then...
Answer:146.75
Explanation:
Please help in these 4 questions
Answer:
See the answers below.
Explanation:
1
The data of 100W means power, and the other data of 220V means voltage, that is to say that bulb serves to work at a voltage of 220V100W datum means power.
J means work that is given in Joules [J], we must remember that power is defined as the relationship between work at a certain time, therefore we can determine work by means of the following expression.
[tex]P=W/t\\[/tex]
where:
P = power [Watt]
W = work [J]
t = time [s]
[tex]W=P*t\\W=100*5[hr]*[\frac{3600s}{1hr} ]\\W=1800000[J] = 1.8[MJ][/tex]
Now the electric cost.
[tex]0.1[kW]*5[hr]*55\frac{LL}{1kwhr} =27.5[LL][/tex]
2
We know that power is defined as the product of voltage by resistance.
[tex]P=V*I[/tex]
where:
P = power [W]
V = voltage [V]
I = current [amp]
[tex]I=P/V\\I=1500/220\\I=6.82[amp][/tex]
3
The voltage can be calculated by means of ohm's law, which tells us that the voltage is equal to the product of resistance by the current.
[tex]V =I*R[/tex]
where:
V = voltage [V]
I = current = 20 [mA] = 0.02 [A]
R = resistance = 20 [kΩ] = 20000 [Ω]
Now replacing:
[tex]V = 0.02*20000\\V = 400 [V][/tex]
4
According to the figure we see that when the current is equal to 10 [mA] the voltage is equal to 1 [V]. With these two values, we can use ohm's law and find the value for the resistance.
[tex]V = I*R\\R = V/I\\R = 1/0.01\\R =100 [ohm][/tex]
Uncle Harry weighs 750 N. What is his mass in kg?
Answer:
W = MG
750 = M * 10
M = 750/10
M = 75 kg
Answer:
76.479 Kilograms Force (kgf)
Explanation:
Why does your weight change on the moon
Answer:
the moon has different gravitational force.
Answer:
Our weight on moon is less than it would be on Earth due to a difference of the strength of gravity on the moon. The moon's gravitation force is determined by the mass and the size of the moon. ... This means that if you went to the moon you would weigh less, even though your mass stays the same!
Explanation:
Please mark brainliest
the kinetic energy of an object of mass in moving with a velocity of 5 MS -1 is 25j what will be its kinetic energy when its velocity is doubled what will be its kinetic energy when its velocity is increased three times. please answer fast I will mark brainly
Answer:
When the speed is doubled, K = 100 J, when the speed is tripled, K = 225 J
Explanation:
Kinetic Energy
Is the type of energy an object has due to its speed. It's proportional to the square of the speed.
The equation for the kinetic energy is:
[tex]\displaystyle K=\frac{1}{2}mv^2[/tex]
Where:
m = mass of the object
v = speed at which the object moves
The kinetic energy is expressed in Joules (J)
The object has a kinetic energy of K=25 J when moving at v=5 m/s, thus the mass can be calculated by solving for m:
[tex]\displaystyle m=\frac{2K}{v^2}[/tex]
[tex]\displaystyle m=\frac{2*25}{5^2}=2[/tex]
m = 2 Kg
If the speed is doubled, v=10 m/s, the new kinetic energy is:
[tex]\displaystyle K=\frac{1}{2}2\cdot 10^2[/tex]
K = 100 J
If the speed is tripled, v=15 m/s, the new kinetic energy is:
[tex]\displaystyle K=\frac{1}{2}2\cdot 15^2[/tex]
K = 225 J
When the speed is doubled, K = 100 J, when the speed is tripled, K = 225 J
Hi can you help me with this please?
An eagle , initially at rest on the ground , lifts off vertically with a constant acceleration of 25 meters per square second . How long will it take the eagle to reach an altitude of 100 meters ?
Answer:
4s
Explanation:
My assumption would be 4s since 25 going into 100 would be 4? hope that helped..