Answer:
Yes
Explanation:
Scientific concept is a scientific theory or law that gives proof of how and why a natural event or process occurs.
Yes, scientific ideas and concepts can be changed because the research never stop and when scientists come with a new theory which is more strong than old theory, the old theory is required to be changed.
For example: In the scientific concept of classification of biodiversity, earlier organisms were classified into binomial system including plant and animal kingdoms but now we have five kingdoms that includes monera, protists, fungi, plant and animal kingdoms.
A 90.0 kg person is sitting 1.00 m away from a 60.0 kg person at a football game. What is the gravitational force between them
Answer:
The force is [tex]36*10^-^9 N[/tex]Explanation:
According to newtons law on gravitation formula, which we are going to apply,
[tex]F= \frac{Gm1m2}{d^2}[/tex]
Where G represents universal gravitation constant, [tex]6.67*10^-^1^1 N.m^2/kg^2[/tex]
Given data
m1= 90 kg
m2= 60 kg
d= 1 m
Substituting our given data into the formula we have
[tex]F= \frac{6.67*10^-^1^1*90*60}{1^2}[/tex]
[tex]F= \frac{6.67*10^-^1^1*5.4*10^3}{1^2}\\\\F= 36*10^-^9 N[/tex]
The gravitational force between the two people in the football game is 3.6 * 10⁻⁷ N
Newton's law of gravitation states that the force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
F = Gm₁m₂/r²
G is the gravitational constant = 6.67 * 10⁻¹¹ N.m²/kg, m₁ = first mass = 90 kg, m₂ = second mass = 60 kg, r = distance = 1 m
F = Gm₁m₂/r²
F = 6.67 * 10⁻¹¹ N.m²/kg * 90 kg * 60 kg / 1² = 3.6 * 10⁻⁷ N
The gravitational force between the two people in the football game is 3.6 * 10⁻⁷ N
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Is it possible to obtain absolute weighless on thr earth surface?
Answer:
Rmmbr... Absolute gravity means zero gravity..
No, and we don't have a zero gravity environment in space, either.
On the ISS, gravity is very much working. Here on the surface, we experience an acceleration of gravity of about 9.81 m/s^2. On the space station they experience a slightly reduced acceleration (about 9.2 m/s^2) because of their increased distance from the center of the Earth (gravity is a 1/r^2 law).
What we are actually experiencing on the ISS is a state of free-fall. Gravity is pulling the astronauts down, just as if they had stepped out of an airplane, but it is also pulling the ISS down. We feel weight on the ground because gravity pulls us down and the ground, not wanting to move, pushes back up at us.
We call the environment on the ISS weightlessness. An astronaut could stand on a scale and appear to have no weight because the scale is falling, too, and therefore can't push back up at us.
The two ways that we best simulate this environment on the Earth is by using airplanes that fly in (approximately) parabolic paths to put the inhabitants and vehicle into free-fall and by working in swimming pools where the neutral buoyancy feels similar to being in free-fall.
Describe a simple pendulum and, What kind of motion does it execute?
what is the use of inclined plane?
Answer:
A ramp
Explanation:
An inclined plane, also known as a ramp, is a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load. The inclined plane is one of the six classical simple machines defined by Renaissance scientists.
what is the result of raising the temperature of the room in which a low-pressure chiller is located
Answer:
the result of raising the temperature of the room in which a low-pressure chiller is located is a
Faster Refrigerant Recovery
On increasing the temperature, the pressure of chiller will increase, causing the blow of hot air in the condenser, which is quite harmful for mechanism of machine.
The given problem is based on the effect of raising temperature on low-pressure chiller.
When temperature of room is raised, then the thermal energy waves last more longer and can cause various organic changes due to variation of chemical reactions.Since, the pressure is directly proportional to temperature. On increasing the temperature, one must increase the pressure of chiller and If the pressures get too high due to lack of air flow, or too hot of air being pulled in through the condenser of chiller, the pressure is going to rise in the machine, the switch will get damaged.Thus, we can conclude that on increasing the temperature, the pressure of chiller will increase, causing the blow of hot air in the condenser, which is quite harmful for mechanism of machine.
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What single property was the most important in Jesseca’s material?
Answer:
Jesseca wanted to create a material that reflected most of the light that fell on it.
Explanation:
Plato Answer
Answer:
Jesseca wanted to create a material that reflected most of the light that fell on it.
The cartesian coordinates of a point in the xy plane are x = −6.46 m, y = −3.78 m. Find the distance r from the point to the origin. Answer in units of m.
Explanation:
Use Pythagorean theorem:
r² = x² + y²
r² = (-6.46 m)² + (-3.78 m)²
r = 7.48 m
Which property of an object is the result of gravity?
A.mass
B.weight
C.volume
D.velocity
PLEASE ANSWER AS FAST AS POSSIBLE
Answer:
A. Mass
Explanation:
Answer:
Weight
Explanation:
what is the formula to calculate acceleration
Explanation:
your formula is here
hope it's helps u
Answer:
Im going to link a picture should help you better then me explaining
Explanation:
What derived unit is used to measure the slope of the line in this graph?
A. g/cm^3
B. g
C. g/cm
D. cm^3
Answer:
g/cm³
Explanation:
From the question given above,
The y-axis is representing mass (g)
The x-axis is representing volume (cm³)
Unit of slope =?
Slope of a graph is simply defined as the change in y-axis divided by the change in x-axis. Mathematically it is expressed as:
Slope = change in y-axis (Δy)/change in x-axis (Δx)
Slope = Δy/Δx
Thus, with the above formula, we can obtain the unit used for measuring the slope as follow:
y-axis = mass (g)
x-axis = volume (cm³)
Slope =.?
Slope = Δy/Δx
Slope = mass (g) /volume (cm³)
Slope = g/cm³
Therefore, the derive unit used for measuring the slope is g/cm³
A cosmic-ray proton in interstellar space has an energy of 10.0 MeV and executes a circular orbit having a radius equal to that of Mercuryâs orbit around the Sun (5.80Ã10^10). What is the magnetic field in that region of space?
Answer:
= 7.88 × 10^-12 T
Explanation:
From the above question, we are told that:
Kinetic Energy of the proton is K. E = 10.0 MeV
Step 1
We convert 10.0 MeV to Joules
1 Mev = 1.602 × 10-13 Joules
10.0 MeV = 10.0 × 1.602 × 10^-13 Joules = 1.602 × 10^-12 J
Hence, the Kinectic energy of a proton = 1.602 × 10^-12 J
Step 2
Find the Speed of the Proton
The formula for Kinectic Energy =
K.E = 1/ 2 mv²
Where
m = mass of the proton
v = speed of the proton
K.E of the proton = 1.602 × 10^-12 J
Mass of the proton = 1.6726219 × 10^-27 kilograms
Speed of the proton = ?
1.602 × 10^-12J = 1/2 × 1.6726219 × 10^-27 × v²
1.602 × 10^-12J = 8.3631095 ×10^-28 × v²
v² = 1.602 × 10^-12/8.3631095 ×10^-28
v = √(1.602 × 10^-12/8.3631095 ×10^-28)
v = 43772331.227m/s
v = 4.3772331227 × 10^7m/s
Approximately = 4.4 × 10^7 m/s
Step 3
Find the Magnetic Field of that region of space
The formula for Magnetic Field =
B = m v / q r
We are told that the proton executes a circular orbit, hence,
mv = √2m(KE)
m = Mass of the proton = 1.6726219 × 10^-27 kg
K.E of the proton = 1.602 × 10^-12 J
v = speed of the proton = 4.4 × 10^7 m/s
q = Electric charge = 1.6 × 10^-19 C
r = radius of the orbit = 5.80Ã10^10 m
= 5.8 × 10^10m
Magnetic Field =
=√ (2 × 1.6726219 × 10^-27 kg × 1.602 × 10^-12 J) /( 1.6 × 10^-19 C × 5.80 × 10^10 m)
= 7.88 × 10^-12 T
The magnetic field in that region of space is approximately 7.88 × 10^-12 T
The half-life of a radioisotope is 6.0 hours. Approximately how long will it take for the activity of a sample to be reduced by 98%?
Answer:
1 hours will be the best answer
The time taken for a sample to reduce by 98% is 33.86 hrs.
What is half life?Half life is the time taken by a radioactive material for the radioactivity of to reduce by half its original value.
The half life equation is:
A = A₀ (½)^(t / T)
where A is the final amount, A₀ is the initial amount, t is the amount of time, and T is the half life.
Given is the half-life of a radioisotope is 6.0 hours and activity of a sample to be reduced by 98%.
Final amount will be 1 - 0.98 = 0.02
Substituting the values, we get
0.02 = 1 (½)^(t / 6)
t = 6 {log(1/0.02)/log2}
t = 33.86 hrs
Thus, time taken is 33.86 hrs.
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A certain mass of oxygen has a volume of 5m^3 at 27°C.If the pressures remain constant,What will be its volume at 77°C?
I need the full answer with working
Answer:
With a pressure, for instance, of 4 atmospheres, and a volume of 5 liters yields 4 x 5 = 20. Divide the result by the number of moles of gas. If, for instance, the gas contains 2 moles of molecules: 20 / 2 = 10. Divide the result by the gas constant, which is 0.08206 L atm/mol K: 10 / 0.08206 = 121.86.
Which statement is accurate about mass or weight?
Mass can be measured in newtons.
Weight can be measured in pounds.
A bowling ball has the same mass as a golf ball.
Objects have the same weight regardless of where they are.
Answer:
Wright can be measured in pounds
Explanation:
Mass is the quantity of matter a body contains while weight is the measure of mass of a body. Weight is the product if mass and the acceleration due to gravity of a body.
If the mass of an object is known, we can determine the equivalent weight of such object and vice versa using the relationship W = mg
m is the mass if the object (in kg)
W is the weight
g is the acceleration due to gravity
g can be measured both on metre/seconds or lb/ft². This means that the weight of an object can be measured in both kgm/s² (Newton) and lb(pounds).
Also note that different object have different masses hence it is not always true to say that a bowling ball has the same mass as a golf ball.
Based on the explanation above, it can be concluded that Weight can be measured in pounds which gives the only correct statement.
Answer:
Weight can be measure in pounds
Explanation:
Having just enough weight to achieve all three states of buoyancy with only minor adjustments in the water is the definition of:
Answer:
Proper weighting
Explanation:
Proper weighing involves the condition of a scuba diver that is fully geared having a near empty tank and the BCD emptied with a held breadth is expected to float at eye level
The fundamental of adequate or good buoyancy of a scuba diver is to ensure proper weighting when diving, With proper weighting, there is more control for the diver when a safety stop is required. There is less need to carry excess weight that increases drag and gas consumption.
At 84.4 kg skier is on a 32.4 ° hill. Using X-Y axes tilted down the plane, what is the x-component of the weight?
The answer I got is 444.
At 84.4 kg skier is on a 32.4 ° hill. Using X-Y axes tilted down the plane. The x-component of the weight is 443.2 N.
What is newton's law?While Newton's second law of motion predicts that the ensuing acceleration is inversely proportional to the item's mass, his theory of gravity predicts that the gravitational force exerted on any object is proportionate to its mass.
According to Newton's Second Law of Motion, when a force applies on a mass, the mass accelerates (gains speed) (object).
X is the component of the weight
Wx = mg sinФ
Wx = 84.4 kg x 9.8 m/s² x Sin 32.4°
Wx = 443.2 N
Y- Component of weight
Wy = mg cosФ
Wy = 84.4 k ку x 9.8 m/s² x COS 32.4
Wy = 698.4N
Therefore, the x-component of the weight is 443.2 N.
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How would you explain the fields of anatomy and physiology to one of your friends
Answer:
this may not help but :)))
Explanation:
Anatomy deals with the body's structure, different parts like cells, tissues, organs and organ system, etc. Physiology deals with the working of the body's part and their specific roles. ... The understanding of the physiology of a living organism is essential to know the function of every organ of the body.
The distance record for someone riding a motorcycle on its rear wheel without stopping is more than 320000 m. Suppose the rider in this unusual situation travels with an initial speed of 8.00 m/s before speeding up. The rider then travels 40.0 m at a constant acceleration of 2.00 m/s2. What is the rider’s speed after the acceleration?
Answer:
v = 15.0 m/s
Explanation:
This is an exercise in kinematics in one dimension
v² = v₀² + 2 a x
in the exercise indicate that the initial velocity v₀ = 8.00 m / s
the distance traveled during acceleration is x = 40.0 m
let's calculate
v² = 8² + 2 2 40
v = √ 224
v = 14.97 m / s
v = 15.0 m/s
Which of the following is not a velocity?*
25 m/s south
100 km/s east
O 50 mph
10 ft/s up
O
Answer:
50 mph
Explanation:
doesn’t have direction
50 mph is not a velocity bcos it doesn't have direction
The force of gravity pulls down on your school with a total force of 400,000 newtons. The force of gravity pulling down on your school would be exactly twice as much if your school:
a Had twice as much mass b Was twice as tall c Had twice as much volume d Covered twice as much area
Answer: A) Had twice as much mass
Explanation:
Given that the force of gravity pulling down on school = 400,000 N
The force of force of gravity is the product of mass of the body and the acceleration due to gravity. The acceleration due to gravity is constant on the earth surface with a constant value of 9.8m/s²
Hence,
F = mg = 800N
F = force of gravity, m = mass of body, g =! acceleration due to gravity.
since g is constant, to have 2F, then mass has to be doubled, that is 2m(2 * mass)
If a body with a mass of 4 kg is moved by a force of 20 N, what is the rate of its acceleration?
Explanation:
F = ma
20 N = (4 kg) a
a = 5 m/s²
During first half of a journey by a body it travel with a speed of 40km/hr and in the next half it travels with a speed of 20 km/hr .Calculate the average speed of the whole journey.
Answer:
Average speed = 26.67 km/h
Explanation:
It is given that,
The first half of the journey by a body is traveled with a speed of 40 km/h and the next half is covered with a speed of 20 km/h
We need to find the average speed of the whole journey. When two speeds are given, the average speed is given by :
[tex]v=\dfrac{2v_1v_2}{v_1+v_2}\\\\v=\dfrac{2\times 40\times 20}{40+20}\\\\v=26.67\ km/h[/tex]
So, the average speed of the body of the whole journey is 26.67 km/h.
Samantha walked 3.9x102 m and then 5.7x102 m. How many total meters did she walk?
Explanation:
397.8m+581.4 = 979.2m
Which of the following items is most sensitive to increased acidity in the environment?
concrete buildings
glass windows
railroad tracks
paved roads
Answer:
Concentrate buildings
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Tysm!
A bird flew 100 meters in 2 minutes. What was the birds speed ? (show all your work below)
Answer:
speed = 50 metres/minute
Explanation:
Distance traveled = 100 metres
Time taken =- 2 minutes
Speed =[tex]\frac{Distance }{Time}[/tex]
speed =[tex]\frac{100}{2}[/tex]
speed = 50 metres/minute
The speed of a bird that flies 100 meters in 2 minutes is 0.83 m/s.
The speed is a scalar magnitude defined as the quotient of the distance traveled and the time, as follows:
[tex] s = \frac{d}{t} [/tex]
Where:
d: is the distance = 100 m
t: is the time = 2 min
Hence, the bird's speed is:
[tex] s = \frac{d}{t} = \frac{100 m}{2 min} = 50 \frac{m}{min}*\frac{1 min}{60 s} = 0.83 m/s [/tex]
Therefore, the bird's speed is 0.83 m/s.
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Perform the calculation and report your answer using sig figs. 657.70 - 26.543
Answer:
The answer is 631.157
Explanation:
The question requested that the answer to the subtraction of 26.543 from 657.70 must be written using significant figures.
Here are a few tips about how to Identify significant figures.
1) It should be noted that the number "0" is what is usually (but not always) affected while trying to identify significant figures. Hence, all other numbers/digits are always significant. For example, 26.543 has five significant figures.
2) The zeros found between these "other numbers/digits" are also significant. For example, 2202 has four significant figures.
3) In the case of a decimal, the tailing zeros or the final zero is also significant. 657.70 and 657.07 have five significant figures.
Now, back to the question
657.70 - 26.543 = 631.157.
Our final answer does not have a zero, hence all the digits (six) are significant.
An element that is unable to create a ion and therefore always has a charge of 0 is most likely a member of a family called
Explanation:
'noble gases' which are also known as group VIII
in most cases, letters of reconmendation are required for addmission to?
Answer:
Get your recommenders to mention diverse achievements. ...
Help your recommenders with relevant info. ...
The letter should always include examples of things you did. ...
The letter should show how you improved over time. ...
The tone of the letter should not be too dry.
The following image represents the movement of a tsunami a giant wave produced by an earthquake at sea. Which type of model is represented in this image?
Large undersea earthquakes at tectonic plate borders frequently produce these amazing waves.
What is tsunami?When the ocean floor at a plate boundary suddenly rises or falls, the water above it is displaced, which causes the rolling waves that will constitute a tsunami to be launched.
In the "Ring of Fire" of the Pacific Ocean, a geologically active region where tectonic movements frequently cause earthquakes and volcanoes, the majority of tsunamis, or roughly 80% of them, occur.
Tsunamis move through the ocean at speeds of up to 500 miles per hour (805 kilometers per hour), which is comparable to a jet plane.
Therefore, Large undersea earthquakes at tectonic plate borders frequently produce these amazing waves.
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Which equation could be rearranged to calculate the frequency of a wave?
wavelength = frequency/speed
frequency = wavelength/speed
wavelength = speed/frequency
frequency = speed x wavelength
Answer:
wavelength = speed/frequency
Explanation:
Required
Determine which of the options can be used to calculate frequency
The relationship between wavelength, speed and frequency is as follows;
[tex]Frequency = \frac{Wave\ Speed}{Wave\ Length}[/tex] ---- Equation 1
When option (1), (2) and (4) are rearranged, they do not result in the above formula; only option (3) does
Checking option (3)
[tex]Wave\ Length = \frac{Speed}{Frequency}[/tex]
Multiply both sides by Frequency
[tex]Wave\ Length * Frequency = \frac{Speed}{Frequency} * Frequency[/tex]
[tex]Wave\ Length * Frequency = Speed[/tex]
Divide both sides by Wave Length
[tex]\frac{Wave\ Length * Frequency}{Wave\ Length} = \frac{Speed}{Wave\ Length }[/tex]
[tex]Frequency = \frac{Speed}{Wave\ Length }[/tex] --- Equation 2
Comparing equation 1 and 2; both equations are the same.
Hence, option (3) answers the question
Answer:
wavelength = speed/frequency
Explanation:
Required
Determine which of the options can be used to calculate frequency
The relationship between wavelength, speed and frequency is as follows;
---- Equation 1
When option (1), (2) and (4) are rearranged, they do not result in the above formula; only option (3) does
Checking option (3)
Multiply both sides by Frequency
Divide both sides by Wave Length
--- Equation 2
Comparing equation 1 and 2; both equations are the same.
Hence, option (3) answers the question