The grand canal was built to make easier the transportation of grains to the power center of north china.
How was the Grand Canal built?The canal was built in order to connect the Yellow River in the north with the Yangtze River in the south. This canal is built for making easier the transportion of grain from the south to the centers of north China. The total length of the Grand Canal is 1,776 km.
So we can conclude that the grand canal was built to make easier the transportation of grains to the power center of north china.
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14. If the spring constant of a simple harmonic oscillator is doubled, by what factor will the mass of the system need to change in order for the frequency of the motion to remain the same?
Lets se
And
[tex]\\ \rm\Rrightarrow T=2\pi\sqrt{\dfrac{m}{k}}[/tex]
[tex]\\ \rm\Rrightarrow \sqrt{k}T=2\pi\sqrt{m}[/tex]
So
[tex]\\ \rm\Rrightarrow k\propto m[/tex]
If spring constant is doubled mass must be doubled
The source of the hot, intergalactic gas in many rich, regular clusters of galaxies appears to be.
Answer:
collisions between galaxies in the cluster.
Explanation:
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What do you think is causing the moon to appear to get bigger and smaller?.
The slope of a line describes the __________.A.change in horizontal direction over the change in vertical direction.change in vertical direction over the change in horizontal directionC.run over the riseD.distance between two points
The slope of a line describes the : ( B ) Change in vertical direction over the change in horizontal direction
What is slope ?Slope is the measure of the steepness of a line it is caluculated by dividing the change in the vertical direction by the change in horizontal direction. slope is also known Δy / Δx.
Hence we can conclude that slope of a line describes the : ( B ) Change in vertical direction over the change in horizontal direction.
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18. A simple series circuit has a current of 2 A
and a resistance of 0.5 ohms. Calculate the
voltage drop across this circuit.
Microwave ovens emit waves of about 2450 MHz. What is the wavelength of this light?
How much work can a 1000-watt motor do in 5.0 seconds?
A. 4.0 × 101 J
B. 2.0 × 102 J
C. 5.0 × 103 J
D. 2.5 × 104 J
Explanation:
[tex]power = \frac{work}{time} [/tex]
Given
POWER=1000 W
TIME=5s
WORK=POWER×TIME
=1000×5
5×10³
OPTION C
What is the essential difference between microwaves and blue light?.
Answer:
There is no essential difference between microwaves and blue light other than a difference in frequency and wavelength.
Explanation:
It is more difficult to determine the total amount of dark matter in an elliptical galaxy than in a spiral galaxy. Why
Answer:
Elliptical galaxies lack the atomic hydrogen gas that we use to determine orbital speeds at great distances from the centers of spiral galaxies.
Beams of different frequency electromagnetic radiation are listed below. Each beam has the same total energy. Rank these beams on the number of photons in each beam.
The arrangement of the photons based on the decreasing number of photons in each beam is; gamma ray > x-ray > green light > yellow light > AMradio wave > FM Radio wave.
What is electromagnetic radiation?The term electromagnetic radiation refers to those rays that do not require a medium of propagation. That is, the are travel through vaccum. We must note that the greater the frequency of the wave, the greater the number of photons.
Hence, the arrangement of the photons based on the decreasing number of photons in each beam is; gamma ray > x-ray > green light > yellow light > AMradio wave > FM Radio wave.
Missing parts;
Beams of different frequency electromagneticradiation are listed below. Each beam has the same total energy.Rank these beams on the number of photons in each beam. green light, FM Radio wave, x-ray, yellow light, gamma ray, AMradio wave
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How long can you keep cooked ham in the refrigerator.
Please help with this physics question I am stuck. see attachment
If a net force acts on an object, the object may change speed, change direction or do neither.
True
False
Answer:
False
Explanation:
A net force on an object causes acceleration or a change in direction....not 'neither'
It is false that if a net force acts on an object, the object may change speed, change direction or do neither. Details about motion can be found below.
What is Newton's law of motion?Newton's first law of motion also called law of inertia states that an object will remain at rest until it is acted upon by an external force.
This law suggests that an object will change direction or speed when acted upon by a net force.
Therefore, it is false that if a net force acts on an object, the object may change speed, change direction or do neither.
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Q6. When a girl steps on to a weighing machine, it shows a reading of 42kg.
(a) What is her mass?
Answer:
92.5 pounds
Explanation:
Hello people ~
Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately
(a) spheres
(b) planes
(c) paraboloids
(d) ellipsoids
Answer:
Spheres
Explanation:
Points charges are the collection of charges which are located very large distance from each other.
Now as they are approximately equidistant like radius of circle or spheres they are to be spherical.
The chamber is now filled with a gas that has an unknown speed of sound. The students find that the lowest frequency at which they can hear a maximum in the sound level is 200 Hz. If the students slowly increase the frequency, what is the next frequency at which the sensor would measure a maximum in the sound level
If the fundamental frequency or first harmonic of the sound is 200 Hz, the next frequency will be third harmonic and it is 600 Hz.
Fundamental frequency of a closed pipeThis is the lowest frequency at which a maximum in the sound level can be heard.
First harmonic of a closed pipe, f₀ = v/4L
Third harmonic of a closed pipe, f₃ = 3v/4L = 3f₀
If the fundamental frequency or first harmonic of the sound is 200 Hz, the next frequency will be third harmonic and it is calculated as follows;
f₃ = 3f₀ = 3(200 Hz)
f₃ = 600 Hz
The complete question is below:
Students use a speaker connected to a sine wave generator to project sound waves into the open left end of a tube that is closed on the right end. The speaker is very close to the tube. A sensor is used to measure the pressure differences created by the sound and the results are displayed on a computer. The entire apparatus is in a sealed chamber that can be filled with different gases.
The chamber is now filled with a gas that has an unknown speed of sound. The students find that the lowest frequency at which they can hear a maximum in the sound level is 200 Hz. If the students slowly increase the frequency, what is the next frequency at which the sensor would measure a maximum in the sound level
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When the net force acting on a droplet of water becomes zero, then it falls with
A.final velocity
B.initial velocity
C.terminal velocity
D.zero velocity
Answer:
C. Terminal Velocity
Explanation:
Terminal velocity is the maximum velocity an object can experience under free-fall. It occurs when the force of drag (air resistance) matches the force of gravity, causing zero net force. Since [tex]F_{net}=ma[/tex], zero net force means zero acceleration.
Remember that an object can be moving at some velocity and still have zero net force. The zero net force just indicates zero acceleration, meaning the velocity is constant and is not changing.
Which of the following is considered the energy of movement?
This is science, pls help.
Answer:
Motion energy, or energy of motion
Explanation:
Answer:
Kinetic Energy is the energy of movement
Explanation:
What do you look forward to more than anything else once school gets out for the summer.
PLEASE HELP!
Explanation:
10 Reasons to Look Forward to GoingBack to School..
The people. ... The places. ... The events. ... Extracurricular activities. ... The dining plan options. ... The housing options. ... The freedom. ... The first day of classes.In australia, which day falls closest to january 1?.
Answer:
The Summer Solstice
Explanation:
Hope it helped!
A 70 kg skydiver experiences 371 N of air resistance
during her skydive.
What is her acceleration?
(The unit is m/s2)
A: 5.3
B: 700
C: 329
D: 4.7
A 70 kg skydiver experiences 371 N of air resistance during her skydive the acceleration is 5.3 m/s². The correct option is A.
Using Newton's second rule of motion, we can calculate the skydiver's acceleration:
F = m x a.
Here,
F = the force (371 N, air resistance in this case)
m = mass of the skydiver (70 kg)
a = acceleration
So, we can write,
[tex]a=\frac{F}{m}[/tex]
Substituting the values,
[tex]a = 371\div 70[/tex]
a = 5.3 m/s².
Thus, the correct option is A.
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What is the difference between potential and kinetic energy?
Explanation:
potential energy is the energy of the position of the object whereas kkinetic energy is the energy of the motion of the object
This sidewalk has lifted up over a period of very hot days. Explain how this is possible in a sentence or two.
Answer:
See below
Explanation:
Heat makes the concrete expand...this expansion causes the concrete to buckle up to make room for the expanded volume
Two unlike charges placed near each other
Answer:
They would attract
but
like charges will repel
Explanation:
HOPE THI HELPS **
When a wave is too steep to support itself, the wave front collapses creating a ________ that advances up the shoreline.
When a wave is too steep to support itself, the wave front collapses therefore creating a break.
What is a Wave?This is defined as the propagation of disturbance from one place to another in an organized manner.
In situations where the wave is too steep to support itself there is a break in the wavefront which advances up the shoreline.
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What determines the speed of an electromagnetic wave?.
Hi!The speed of a wave is a product of its wavelength and frequency. Because all electromagnetic waves travel at the same speed through space, a wave with a shorter wavelength must have a higher frequency, and vice versa. This relationship is represented by the equation: Speed = Wavelength × Frequency.
The graph above shows the position x as a function of time for the center of mass of a system of particles of total mass 6. 0 kg. For a very short time interval around 2. 0 s, an external force is exerted on an object in the system. What is the resulting change in momentum of the system?.
The resulting change in momentum of the system will be +18.6 Ns. The momentum is conserved.
According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.
The given data in the problem is;
m is the mass =6.0 kg
t is the time interval=2 second
From Newton's second law;
[tex]\rm \triangle P =m \triangle V \\\\ \triangle P= m(\frac{\triangle x}{\triangle t} )\\\\[/tex]
From the graph;
[tex]\rm \triangle t = 2sec\\\\ \triangle x = (12-8) m[/tex]
The change in the momentum is;
[tex]\rm \triangle P = m\tr(\frac{v-u}{t}) \\\\ \triangle P =9.3 \times \frac{12-8}{2} \\\\ \triangle P= +18.6 \ N.s[/tex]
Hence, the resulting change in momentum of the system will be +18.6 Ns.
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What is the current in a 10V circuit if the resistance is 20?
Answer:
check the attachments for the solution
How many times a year does the earth revolve around the sun?.
Answer:
once
Explanation:
the earth orbits the sun fully once a year.
The diagrams show four blocks of steel. The blocks are all drawn to the same scale. The same quantity of thermal energy is given to each block. Which block shows the greatest rise in temperature?
Block 4 shows the greatest rise in temperature. The rise in the temperature is inversely proportional to the initial length. The concept of thermal expansion is used in the given problem.
What is thermal expansion?Thermal expansion is the tendency of matter to alter its form, area, volume, and density in response to a change in temperature.
The formula for the thermal expansion is found as;
[tex]\rm \triangle L = L \alpha \triangle T \\\\\ \triangle T = \frac{\triangle L}{L\alpha}[/tex]
The rise in the temperature is inversely proportional to the initial length;
Block 4 has the smallest initial length.
Hence, the block 4 has the greatest rise in temperature.
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