If dan ran the 100m dash in 10.23s. What was his average speed during the race? (Round to the nearest tenth of a second)
Answer:
.1 seconds per meter
Explanation:
I am going to assume they are asking for the average time per 1 meter.
Because it took 10.23 seconds to run 100 meters, we are going to divide 10.23 by 100. This number will be the time per 1 meter.
To divide by 100, we will move the decimal point over by two. That will give us .1023 seconds.
The question asks to round to the nearest tenth, so we round it to .1 seconds.
*Just some trivia: Danie van Blerk does in fact have a time of 10.23 seconds. He has the 1073rd best 100 meter dash time. First place, Usain Bolt, has a time of 9.58 seconds.
1. A wave travels at 1,500 m/s with a frequency of 5 hertz. What is its wavelength?
a. 7,500 m
b. 1,505 m
c. 300 m
d. 1,495 m
2. Humans can hear thunder at different frequencies. These correspond to wavelengths ranging from 2.75 to 16.5 meters. If the speed of sound is approximately 330 m/s, what frequencies of thunder can humans hear?
a. 2.75 to 16.5 hertz
b. 907.5 to 5,445 hertz
c. 20 to 120 hertz
d. 0.0083 to 0.05 hertz
3. Two similar waves X and Y travel through the same medium. Wave X has a frequency of 200 hertz and a wavelength of 35 meters. Wave Y has a frequency of 700 hertz. What is the wavelength for wave Y?
a. 4,900,000 meters
b. 122.5 meters
c. 0.1 meter
d. 10 meters
4. California sea lions communicate underwater at frequencies ranging from 500 to 4,000 hertz. The speed of sound in sea water is approximately 1,500 m/s. What are the approximate wavelengths of sound with which the California sea lions communicate?
a. 750,000 to 6,000,000 meters
b. 0.375 to 3 meters
c. 2,000 to 5,500 meters
d. 0.33 to 2.66 meters
With the use of wave speed formula, below are the answers to the questions
1. C
2. C
3. D
4. B
All the question centered on wave speed, wavelength and wave frequency. The relationship between these three quantities is;
wave speed = wavelength x frequency
That is,
V = Fλ
1. The given parameters are;
V = 1,500 m/s
F = 5 Hz
wavelength λ = V/F = 1500/5 = 300 m
2.) Given that the wavelengths ranging from 2.75 to 16.5 meters and the speed of sound is approximately 330 m/s
When wavelength = 2.75 m
F = V/ λ = 330 / 2.75 = 120 Hz
When wavelength = 16.5 m
F = V/ λ = 330 / 16.5 = 20 Hz
Therefore, the frequencies of thunder humans hear ranges from 20 Hz to 120 Hz
3.) Since the two waves are similar, they will be travelling at the same speed. That is,
Wave speed of X = Wave speed of Y
For wave X and Y respectively;
F = 200 Hz and 700 Hz
λ = 35 m and λm
Find λ of Y by equating the two wave speed. That is,
Fλ for X = Fλ for Y
200 x 35 = 700 λ
λ = (200 x 35)/ 700
λ = 7000 / 700
λ = 10 m
Therefore, The wavelength for wave Y is 10 m
4.) Given that the sea lions frequencies are ranging from 500 to 4,000 hertz. And the speed of sound in sea water is approximately 1,500 m/s
By using the same formula,
V = Fλ
Make wavelength the subject of formula
λ = V / F
When F = 500 Hz
λ = 1500/500 = 3 m
When F = 4000 Hz
λ = 1500/4000 = 0.375 m
Therefore, the approximate wavelengths of sound with which the California sea lions communicate is of the range 0.375 m to 3 m
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In which of these can convection not occur?
gases
solids
liquids
fluids
Answer:
B: Solids
Explanation:
I have notes from EDG and I looked it up on the internet
I hope this helps
In the solids, convection can not occur. Convection can only be done in the fluids.
What is convection?Under the effect of gravity, hotter, less dense material rises while colder, denser stuff sinks, resulting in heat transfer"Convection is the ultimate mode of energy transmission to the surface"
There are three modes of the heat transfer;
1. Conduction
2. Convection
3. Radiation
Convection occurs in the fluid which is liquid and gases. Convection never occurs in the solid.
Hence option B is correct.
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is corona the least dense layer in the sun? please fast
Answer:
the Corona is about 10 million times less dense than sun's surface.this low density makesuch less bright than surface of the sun
Answer:
dude the ans no corona,
Explanation:
It cannot survive in space let alone be one of the layer of the sun due to its high temperature ( that is 2million fahrenheit )
Please help??!
Which of the following uses repeating vowel sounds?
1.The cold, soulless vacuum of space
2. Cool, blue, moonlit room
3. If loneliness is a disease, love is the cure
4. Windy, whooshing weather
Answer: 4. Windy, whooping weather
Explanation: b/c it is!
Answer:
Windy, whooping weather
Explanation:
thats the answer
A copper piece cannot br made a magnet why
Answer:
1. A copper piece cannot be changed into magnets, because -
• Only the ferromagnetic metals (the metals which have magnetic properties) can be changed into electromagnets or permanent magnets.
• But,copper is not a ferromagnetic metal and that's why we cannot change the copper into any kind of magnets
Explanation:
When hit with a bat which ball will accelerate more?
A 2kg ball
A 15kg ball
A 10kg ball
A 5kg ball
Hurry need help ASAP
Answer:
last one
Explanation:
What are the main differences between the manual, oscillate and pulse functions?
The main differences between the manual, oscillate and pulse functions are;
Manual function requires work when we move it. Oscillate function works with automation.The pulse function follow pulse of a heart rate is used for pushing the button.A pulse can be regarded as a signal processing which is is rapid, transient change in the amplitude of a signal from a baseline value to a higher or lower value.
The Oscillate function works with automation and it requires some automated system.
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What is the equation for frequency?
Answer:
f=1/t is the equation of frqency
If I was floating in space, why would a scale read my weight as "0"?
Answer:
No external contact force.
Explanation:
Mass is defined as the amount of material an object contains, that doesn't change whether the object it on earth, on the moon or anywhere in space. Except the only force that is acting upon the body in gravity and they don't feel gravitational attraction towards the earth.
The work per unit charge required to move a charge between two points in an electric circuit defines electric
A) force
B) Power
C) field strength
D) potential difference
The work per unit charge required to move a charge between two points in an electric circuit electric potential difference. The right option is D) potential difference
What is electric potential difference?Potential difference can be defined as the work done in moving a unit charge from one point to another in an electric field. The S.I unit of potential difference is volts (V).
From the question,
Force: is the product of mass and acceleration Power: This is the rate at which work is done.Field strength: This is the force per unit charge in a field.Potential difference: This is the work done in moving a unit charge from one point to another in a field.Hence, from the above, the right option is D) Potential difference
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A car moving at a constant speed changes direction. Is the car accelerating? How do you know?
Answer:
No
Explanation:
Acceleration is the rate of change in velocity. Here the car maintains a constant speed, no change in velocity
What is the mass of an object going 25 m/s and has a momentum of 140
kg m/s?
Answer:
The answer would be 5.6 kg of a mass.
Explanation:
p= mv
m= p/ v
The explanation of that is:
momentum = mass× velocity
mass= momentum / velocity
Hope this helped!
HELP PLZ HELP !!!!!!!!!!!
Answer:
From least to greatest: Neon, Sodium, Silicon, Iron, Uranium
Explanation:
Here are all the atomic numbers for each one:
Iron = 26
Sodium = 11
Uranium = 92
Neon = 10
Silicon = 14
Hope this helps! :D
How much must a man weigh (force) if the pressure he exerts while standing on one foot which has an area of 25 m^2 exerts a pressure of 5 pa?
Answer:
Weight, W = 125 N
Explanation:
Pressure, P = 5 Pa
Area, A = 25 m²
We need to find how much must a man weigh (force) if the pressure he exerts while standing on one foot which has an area of 25 m² exerts a pressure of 5 Pa. So,
Pressure = force/area
So,
[tex]F=P\times A\\\\F=5\times 25\\F=125\ N[/tex]
So, the weight of the man is 125 N.
A block of mass m is attached to ideal spring of constant k. When the spring is neither stretched nor compressed, block is at the
equilibrium position (x-0).
Assume the force between the mass and the spring obeys Hooke's Law: Fs-kx, where x is the displacement and Fs is the
restoring force. The restoring force is always directed toward the equilibrium position. In this example of vibrational motion, the
restoring force illustrates Newton's
A. first law of motion
B. 2nd law of motion
C. 3rd law of motion
D. law of gravitational attraction
Answer: Newton’s Third Law of Motion
Explanation:
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which fuel is considered as a clean fuel for vehicles?
Answer:
Biodiesel or biogas vehicles are seen as an element on the path towards energy independence from fossil fuels and relief from unstable oil prices. ... CIVITAS cities test for example the use of biodiesel, biogas, compressed natural gas (CNG) and hybrid vehicles.
Explanation:
what are phrasal verbs. please help will give brainliest
Answer:
In English traditional grammar, a phrasal verb is the combination of two or three words from different grammatical categories: a verb and a particle, such as an adverb or a preposition — to form a single semantic unit on a lexical or syntactic level. Examples: turn down, run into, sit up.
Explanation:
An unknown element has 5 protons, 5 electrons, and 6 neutrons what is the atomic mass of this element
The atomic mass is the protons + the neutrons.
So your answer would be 5 + 6 = 11.
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What is difference between continuous and discontinuous variations? Give examples for each of it
Answer:
Examples. Weight, height, and length of organisms are examples of continuous variation while the color of petals, blood groups of animals, the gender of animals, etc. are examples of discontinuous variation.
Explanation:
Hope it helps
PLEASE HELP!!!!
An electron is located 4.22 mm away from an isolated proton. If the distance between the two particles is increased to 8.44 mm, what
happens to the electrical potential energy of the electron and why?
O A. The electrical potential energy will increase because work must be done to separate two particles that attract one another.
B. The electrical potential energy will remain the same because the electron and proton are both fundamental particles and their
charge cannot be changed.
O
C. The electrical potential energy will increase because larger energies are associated with greater distances.
O D. The electrical potential energy will decrease because no work is necessary to increase the distance between particles that
demonstrate attraction.
You can download answer here
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If the distance between the two particles is increased to 8.44 mm, the electrical potential energy will increase because work must be done to separate two particles that attract one another. Hence option(A) is correct.
What is potential energy?Potential energy is the energy held by an object as a result of its position relative to other objects, internal stresses, electric charge, or other factors.
The gravitational potential energy of an object, the elastic potential energy of an extended spring, and the electric potential energy of an electric charge in an electric field are all examples of common types of potential energy. The joule, denoted by the symbol J, is the unit of energy in the International System of Units (SI).
The positive and negative charges attract each other, so work must be done to separate two particles. Hence, the electrical potential energy will increase.
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Why did Kenyatta want to distance himself from the Mau Mau? Check all that apply.
They had no desire for independence.
The British were determined to crush the rebellion.
They were criminals and made achieving independence more difficult.
They were led by his political rivals.
They were members of the Kikuyu.
Answer:
The British were determined to crush the rebellion.
They were criminals and made achieving independence more difficult.
Explanation:
Mau-mau were rebellions and wanted to push out British and other Europeans out of Kenya. Mau mau were also the members of the Kikuyu and were making independence more difficult, due to their rebellion attitude. They were a secret society of Kikuyu.
2) The British were determined to crush the rebellion.
3) They were criminals and made achieving independence more difficult.
After British victory in World War II, Kenyatta received a request to return to Kenya in September 1946, sailing back that month. He decided not to bring Edna—who was pregnant with a second child —with him, aware that if they joined him in Kenya their lives would be made very difficult by the colony's racial laws. On his arrival in Mombasa, Kenyatta was greeted by his first wife, Grace Wahu and their children. He built a bungalow at Gatundu, near to where he was born, and began farming his 32-acre estate.
(a) The British were determined to crush the rebellion.
(b) They were criminals and made achieving independence more difficult.
What is the desire of Kenyatta?Mau-mau were rebellions and wanted to push out British and other Europeans out of Kenya. Mau mau were also the members of the Kikuyu and were making independence more difficult, due to their rebellion attitude. They were a secret society of Kikuyu.
2) The British were determined to crush the rebellion.
3) They were criminals and made achieving independence more difficult.
After British victory in World War II, Kenyatta received a request to return to Kenya in September 1946, sailing back that month. He decided not to bring Edna—who was pregnant with a second child —with him, aware that if they joined him in Kenya their lives would be made very difficult by the colony's racial laws.
On his arrival in Mombasa, Kenyatta was greeted by his first wife, Grace Wahu and their children. He built a bungalow at Gatun, near to where he was born, and began farming his 32-acre estate.
Thus the British were determined to crush the rebellion.They were criminals and made achieving independence more difficult.
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Hernando builds a simple DC series circuit with a standard D-cell battery and uses an ammeter to determine that the total current in the system is 3.0 A. In an attempt to increase the brightness of the bulbs in the circuit, he tries to increase the voltage by adding two more batteries (in series with the first). Calculate the new current when driven by three batteries.
Answer: I = 9.0 A
Explanation: Ohm's Law is defined as the relationship between voltage and current: in a circuit, the voltage accross a conductor is directly proportional to the current.
The constant of proportionality is Resistance, whose unit is ohm (Ω).
so, Ohm's Law is
V = R.I
It is asked for the current, so, rearraging:
[tex]I=\frac{V}{R}[/tex]
When added two more batteries, the voltage of the circuit triples:
[tex]V_{final}=3V_{initial}[/tex]
Since they are directly proportional, if voltage triples, so does current:
[tex]I_{final}=3I_{initial}[/tex]
[tex]I_{final}=3(3.0)[/tex]
[tex]I_{final}=[/tex] 9.0
The new current, when driven by 3 batteries is 9.0 A.
When both momentum and kinetic energy are conserved,
the collision is an __________
collision.
Answer:
Elastic collision
Explanation:
An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision. Both momentum and kinetic energy are conserved quantities in elastic collisions. Supposed two similar trolleys are traveling toward each other with equal speed.
A bus as speed of 20m/s begin to slow at constant acceleration of 8.00m/s2 along a straight line find the average speed for the 5al.S interval
Answer:
the final velocity of the bus is -20 m/s.
Explanation:
Given;
initial velocity of the bus, u = 20 m/s
deceleration of the bus, -a = 8 m/s²
time of motion, t = 5 s
The final velocity of the bus is calculated as;
v = u + at
v = 20 + (-8 x 5)
v = 20 - 40
v = -20 m/s.
Therefore, the final velocity of the bus is -20 m/s.
High energy waves have what
Answer:
It means that the frequency will be a lot higher with a shorter wave.
An athlete whirls a 7.00 kg hammer 1.8 m from the axis of rotation in a horizontal circle, as
shown in the figure below. The hammer makes one revolution in 1.0 s. What is the tension in
the chain?
A-500 N
B-50 N
C-5000 N
D-5 N
Answer:
A-500 N
Explanation:
The computation of the tension in the chain is shown below
As we know that
F = ma
where
F denotes force
m denotes mass = 7
And, a denotes acceleration
Now for the acceleration we have to do the following calculations
The speed (v) of the hammer is
v = Angular speed × radius
where,
Angular seed = 2 × π ÷ Time Period
So, v = 2 × π × r ÷ P
v = 2 × 3.14 × 1.8 ÷ 1
= 11.304 m/s
Now
a = v^2 ÷ r
= 70.98912 m/s^2
Now the tension is
T = F = m × a
= 7 × 70.98912
= 496.92384 N
= 500 N
A plane loaded with cargo travels 2000 miles at an average speed of 400 Miles per hour. On the return trip on the same route it travels at an average speed of 480 miles per hour. How much quicker was the return trip
Answer:
Difference = 1.83 hours
Explanation:
Let the two trips be A and B respectively.
Given the following data;
Distance A = 2000 miles
Speed A = 400 miles
Distance B = 2000 miles
Speed B = 480 miles per hour
To find the time spent;
a. For trip A.
Time A = distance A/speed A
Time A = 2000/400
Time A = 5 hours
b. For trip B.
Time B = distance B/speed B
Time B = 2000/480
Time B = 4.17 hours
Next, we would find the difference between the two trips.
Difference = Time A - Time B
Difference = 5 - 4.17
Difference = 1.83 hours
Therefore, the return trip was much quicker by 1.83 hours.
The return trip of the airplane will be quicker by 1.84 hours
What will be the time taken by the airplane on the second trip?It is given that
Distance covered by the plane D= 2000 miles
The average speed of the plane
[tex]V_1=400\ \frac{Miles }{hour }[/tex]
The Return Average speed of the plane
[tex]V_2= 480\ \frac{Miles}{hour}[/tex]
Now we will first find the time taken by the airplane during the first visit.
[tex]V_1=\dfrac{Distance }{Time }[/tex]
[tex]Time = \dfrac{Distance }{V_1}[/tex]
Now by putting the values in the formula
[tex]T_1=\dfrac{2000}{400} =5\ hours[/tex]
Now for the return trip time taken by the plane
[tex]T_2=\dfrac{Distance }{V_2}[/tex]
[tex]T_2= \dfrac{2000}{480}[/tex]
[tex]T_2= 4.16\ hours[/tex]
Now the difference between the time will be
[tex]=T_1-T_2=5-4.16=0.86=1.84 \ Hours[/tex]
Thus the return trip of the airplane will be quicker by 1.84 hours
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Which characteristic is defined as the distance traveled by a wave crest in a given time?
frequency
wavelength
amplitude
speed
Answer:
Amplitude
The amplitude ( ) of a wave is the distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough .
Explanation:
Hope it helps
The distance traveled by a wave crest in a given time is defined as: D. speed.
What is a wave?A wave can be defined as a disturbance in a medium that progressively transport energy from a source to another location, especially without the transportation of matter.
The characteristics of sound wave.Some examples of the characteristics of a wave include the following:
FrequencyWavelengthAmplitudeSpeedIn Science, speed refers to the distance traveled by a wave crest in a given time.
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