Answer:
decreased
Explanation:
because it transfered from 10.0s
to 8.0s
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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Alana organized some resources in a table. which best describes alana’s error? geothermal energy is not found underground. petroleum is limited in supply. sunlight cannot be used to generate electricity. coal is not considered a fossil fuel.
Answer: B) Petroleum is limited in supply
Explanation: Have a Great day!!
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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How many times a year does the earth revolve around the sun?.
Answer:
once
Explanation:
the earth orbits the sun fully once a year.
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.
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
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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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:
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.
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
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.
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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How high off the ground must you be if you mass is 75 kg and you have 11,025 J of energy stored inside?
Answer:
15 m
Explanation:
Given,
Mass ( m ) = 75 kg
Potential energy ( P.E ) = 11,025 J
To find : Hight ( h )
Formula : -
P.E = mgh
[ Note : The value of g = 9.8 m/s² ]
h = P.E / mg
= 11,025 / ( 75 x 9.8 )
= 11,025 / 735
h = 15 m
Hence,
15 m is the high off the ground must you be if you mass is 75 kg and you have 11,025 J of energy stored inside.
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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Blue light is bent more by a prism than orange light. Does blue light or orange light have a larger index of refraction in glass?.
What is the gravitational potential energy stored in a 60 kg boy sitting at the top of a 2 m high slide? (g = 10 N/kg)?
Answer:
1200 Joules
Explanation:
PE = mgh
PE = 60 * 10 * 2
PE = 1200 Joules
The gravitational potential energy stored in a [tex]60 Kg[/tex] boy sitting at the top of a [tex]2 m[/tex] high slide is [tex]1200 J[/tex].
What is potential energy?Potential energy is the energy possessed by a body by virtue of its position relative to others.
[tex]U = mgh[/tex]
Where,
[tex]U =[/tex] potential energy
[tex]m =[/tex] mass
[tex]h =[/tex] height
[tex]g =[/tex] acceleration due to gravity
It represents the potential an object has to do work as a result of being located at a particular position in a gravitational field.
The energy that a ball has when placed at a top of a steep hill while it is about to roll down is an example of potential energy.
Given:
[tex]m = 60 Kg[/tex]
[tex]h = 2m[/tex]
Potential energy is
[tex]U = mgh\\U = 60*10*2\\U = 1200 J[/tex]
Potential energy is [tex]U = 1200 J[/tex]
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photosynthesis is an endothermic reaction that plants use to store energy from the ______________
A block of mass 2. 0 kg, starting from rest, is pushed with a constant force across a horizontal track. The position of the block as a function of time is recorded, and the data are shown in the table. What is the magnitude of the change in momentum of the block between zero and 4. 0 seconds?.
The magnitude of the change in momentum of the block between zero and 4. 0 seconds is
dp=1.6m/s
What is the magnitude of the change in momentum of the block between zero and 4. 0 seconds?
Generally, the equation for the kinematics equation is mathematically given as
x=x+ut+0.5at^2
Therefore
1.6=0+0+0.5*a*1^2
a=0.2m/s^2
In conclusion, change in momentum
dP=mv-mu
2.0*0.8-0
dp=1.6m/s
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Two unlike charges placed near each other
Answer:
They would attract
but
like charges will repel
Explanation:
HOPE THI HELPS **
In australia, which day falls closest to january 1?.
Answer:
The Summer Solstice
Explanation:
Hope it helped!
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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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
What do you think is causing the moon to appear to get bigger and smaller?.
How long can you keep cooked ham in the refrigerator.
Question 14:A light bulb is connected to a 110-V source. What is the resistance of this bulb if it is a 100-W bulb
By the use of Ohm's law, the resistance of the bulb is 121 ohms
What is electrical power?Let us recall that power is the rate of doing work. Now we know that the voltage of the power source is 110-V and the power is 100-W.
Since;
P= IV
I = P/V
I = 100/110
I = 0.91 A
Again;
V= IR
R = V/I
R = 110/0.91
R = 121 ohms
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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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Please help with this physics question I am stuck. see attachment
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.
The principal limitation of wind power is unpredictability. please select the best answer from the choices provided t f
Answer:
T
Explanation:
Hard to know when the wind will blow .
The principal limitation of wind power is unpredictability. this statement is very much true.
What is wind power?In order to produce electricity, wind turbines are mostly used in wind power as well as wind energy. In comparison to burning fossil fuels, wind energy is a well-liked, environmentally friendly, renewable energy source.
Although weather forecasting has become more accurate over time, it is still challenging to anticipate how much and when wind will blow where and when it will. Even though some regions are known to experience more wind than the others, there is currently no way to predict that however much wind here will be because of the inconsistent nature of weather patterns.
Therefore, the given statement is true.
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Your question is incomplete but most probably your full question was,
The principal limitation of wind power is unpredictability. Please select the best answer from the choices provided
a. True
b. False
If an object goes through a
chemical reaction, but does not
change in mass, that object has
A. the same amount of gravity
B. more gravity
C. less gravity
Answer:
A, The same amount of gravity
Explanation:
If an object goes through a chemical reaction, but does not change in mass, that object has the same amount of gravity.
What is chemical reaction?A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Chemical reaction include changes in color, temperature, the production of light, changes in odor, and the formation of gases.
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