Answer:
Free-fall is defined as the movement where the only force acting on an object is the gravitational force.
By the second Newton's law, we have that:
F = m*a
Where F = Force, m = mass, a = acceleration.
We can write this as:
a = F/m
And the gravitational force can be written as:
F = (G*M/r^2)*m
Where G is the gravitational constant, M is the mass of the Earth in this case, and r is the distance between both objects (the center of the Earth and the free-falling object)
As the radius of the Earth is really big, the term inside the parentheses is almost constant in the region of interest, then we can write:
G*M/r^2 ≈ g
And the gravitational force is:
F = g*m
And by the second Newton's law we had:
a = F/m = (g*m)/m = g
a = g
Then the acceleration does not depend on the mass of the object.
Then the thing that is common among the free-falling objects is the vertical acceleration.
All of the following devices tiſansmit energy/information: cell phones, walkie talkies, remote
controls, and sunlight. Which statement is true regarding these transmissions?
Answer:
All of the following devices transmit energy/information: cell phones, walkie talkies, remote controls, and sunlight.
They are all radiation.
I got a 100 on this test.
1. consider the free body diagram. If the sum of the tension forces is equal to the force of gravity, which description BEST applies?
answer. A girl hangs by both hands, motionless, from a trapeze.
2. What causes sea floor spreading ?
answer. Magma.
3. 10 n -> (BOx) <- 20 n Which expression represents the total force on the block ?
answer. 10n =+ -20n.
4. Which waves move by replacing one particle with another?
answer. Sound waves.
5. The table shows dates and appearance of index fossils. Which rock layers can be dated most precisely?
answer. a layer containing both a fossil from 1 and 2
This is an illustration of the ___ moon
answer. new.
hope these help
hey can anyone help me out pls!
If you try to squish a table it aint gonna move. That is because,
C. They are packed closely together.
A isn’t true.
B is true, they do vibrate, but that is NOT the reason why it doesn’t change when pressure is applied.
D is wrong because C is correct.
HELP PLEASE THIS IS DUE RIGHT NOW. What is the difference between constant acceleration and instantaneous acceleration?
Which of the following is most likely to happen when energy is transferred to an object A) the object will stay exactly the same B)The object Will begin to move C)the force on the object will decrease D) the mass of the object will increase
Answer:
B. the object will begin to move
Explanation:
If energy is transferred the object will definitely change so it CANNOT be "A". If you add energy the object will have more force so it CANNOT be "C". The mass of an object can't increase just by giving an object energy so it CANNOT be "D"
When energy is transferred to an object, the object is most likely to move either it gains a kinetic energy or it undergo a thermal vibration if thermal energy is applied.
What is energy transfer?Energy can be transferred from its high energetic area to less . All forms of energy can be transferred like this.For example, heat energy can be transferred through various modes such as conduction, convection, radiation etc.
When an object gain some energy its particles starts to vibrate and move apart. This makes the intermolecular force of attraction between molecules weaker than before and they tend to be more reactive.
The energy transferred to an object does not make any change in mass, or any of its innate properties or does not apply any force. Therefore, option B is correct.
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Is It true that if you drop a heavy object and a lighter object at the same time, they will both drop at the same time due to gravity?
Answer:
[tex]\huge\boxed{True.}[/tex]
Explanation:
This is true because gravity is independent of mass. Whether it's a heavy or a light object, when dropped, they both will hit the ground at the same time. The reason is that gravity does not depend on mass.
Hope this helped!
~AnonymousHelper1807Jennifer works for an automaker and tests the safety performance of cars. She watches a 2,000-kilogram car crash into a wall with a force of 30,000 newtons. What’s the acceleration of the car at impact? Use F = ma.
The answer is a = 15 m • s - 2.
Answer:
A
Explanation:
How many significant figures?
5.0001
O None of these are correct
O 5
02
0 1
5
if zero falls between two significant numbers it becomes significant.
compare the advantages and disadvantages of converting our system of measurement in the united states from the English system to the international system of units
Answer:
This is required answer.
Explanation:
Given that,
The advantages and disadvantages of converting our system of measurement in the united states from the English system to the international system of units
The difference between SI units and english system units.
SI systems,
The SI system uses metre, kilogram and second.
English system,
The english system uses yard, foot, cubit, mile, quart, pint, gallons, etc.
We need to find the comparison between system of measurement in the united states from the English system to the international system of units
Advantage :
The most advantage of SI unit is that it has only one unit for each quantity. It means, it is never needed to change from one unit to another unit and here is no changing factors for students to memorize.
Disadvantage :
The most disadvantage of english system is that it has more unit for each quantity. It means, it is needed to change from one unit to another unit and here is changing factors most for students to memorize.
Hence, This is required answer.
Transitioning to the International System of Units (SI) offers global standardization, simplicity, and consistency in measurements, promoting scientific accuracy and ease of communication. However, the process involves costs, potential resistance to change, and considerations of cultural and practical factors that need to be carefully addressed for a successful conversion.
Here's a comparison:
Advantages of converting to the SI system:
1) Global Standardization: The SI system is the most widely used system of measurement worldwide, ensuring uniformity and ease of communication in international trade, science, and engineering.
2) Simplicity and Coherence: The SI system is based on a decimal system, making conversions between units straightforward and logical.
3) Consistency and Interchangeability: SI units are based on well-defined standards and physical constants, providing a consistent and unambiguous way to express quantities, and improving the accuracy and reliability of measurements.
4) Learning and Education: Adopting the SI system in education can simplify the learning process for students and facilitate the understanding of scientific concepts, promoting scientific literacy.
5) Compatibility with Technology: The SI system is compatible with modern technology and scientific instruments, enhancing the accuracy and precision of measurements.
Disadvantages of converting to the SI system:
1) Transition Costs: Implementing a change in the entire measurement system can be costly, requiring new standards, education, and recalibration of equipment and infrastructure.
2) Resistance to Change: People who are familiar with the English system may initially resist adopting the SI system, leading to a learning curve and potential confusion during the transition.
3) Cultural Factors: The English system has been ingrained in the culture and everyday life of the United States, and some may argue for preserving the historical tradition of the system.
4) Potential Loss of Precision: In some cases, the SI system may result in rounded or approximated measurements, leading to potential loss of precision compared to the English system.
5) Mixing Units: During the transition period, there might be a mix of both systems, leading to potential errors or misunderstandings when using different units.
In summary, transitioning to the International System of Units (SI) offers global standardization, simplicity, and consistency in measurements, promoting scientific accuracy and ease of communication.
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There are 100 simple pendulums in a room having identical bobs which are displaced to different extents but only 25 of these pendulums have different time periods. What do you think would be the reason?
Explanation:
The time period of a simple pendulum is given by :
[tex]T=2\pi \sqrt{\dfrac{L}{g}}[/tex]
L is length of the pendulum and g is acceleration due to gravity
It is very much clear that the time period depends on the length of the pendulum.
In this problem, there are 100 simple pendulums in a room having identical bobs which are displaced to different extents but only 25 of these pendulums have different time periods. The only reason for 25 pendulums having different time periods is that they have different lengths than the other 75 pendulums.
Horizontal line on a position time graph indicate that the object is
The position- time graph of an object gives the velocity of the object. If the graph shows a horizontal line along the x axis, the object is stationary.
What is velocity?Velocity of an object is a physical quantity measuring the distance covered per unit time. It is a vector quantity and thus have a magnitude and direction. Velocity is thus, the ratio of change in distance to the change in time.
v = dx/dt.
A moving object is always associated with certain velocity. Which can be constant or changing. The plot of position v/s time gives the change in position with respect to time. Thus, velocity can be calculated from this.
If the position -time graph shows a horizontal line means there is no change in distance with time and the velocity of the object is zero. Thus, the object is stationary or at rest.
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it takes 1.4 minutes for Jonny to get to class which is a distance of 82 meters away s. what is Johnny’s average speed in seconds?
A biker accelerates from rest to 10 m/s in 5 seconds. What is the biker's
acceleration? Calculate for the missing variable
Your answer
Answer:
It starts from rest so Vi=0
Vf=10 m/s
t=5 seconds
Explanation:
a=Vf-Vi/t
a=10-0/5
a=10/5
a=2m/s^s
What information does a distance time graph provide
"Suppose an elephant (Tiny) was
pacing back and forth at the zoo.
She first goes 8 meters to the
left, 6 meters to the right, and 2
meters to the left.
What is the total distance Tiny
has traveled?
I
What is Tiny's displacement?
ons How many protons are in an atom of tin?
How many electrons are in an atom of tin?
How many neutrons are in an atom of tin? Round your
answer to the nearest whole number.
Answer:50,50,69
Explanation:I just did it
During an experiment, a student moved a cell from pure water to salted water. What will most likely happen to the cell?
Answer:
During an experiment, a student moves a cell from pure water to salted water. ... It will release water and shrivel. It will release water and burst.
in your ans
A jogger runs the first 250 m of a race in 13.5 sec. What is the jogger's
velocity(m/s)?
Answer:
S=250 m
t=13.5 sec
V=?
Explanation:
V=S/t
V=250/13.5
V=18.51m/s
What is energy?
A.a push or pull
B. A change in the position of an object
C. The ability to cause change in matter
D. Anything that takes up space and has mass
Bile helps in the digestion of —————-
Answer:
Bile helps in the digestion of fats
What is the phase of water when its temperature is 150 °C?
If you want to know your speed going from point A to point B, what
information do you need to know?*
Answer:
the distance between point a and b and the time it takes to get from a to b.
Explanation:
d/t =v
How many millimeters are in .075cm ?
Answer: 0.75
Explanation:
take away the 0
Name three properties that can be observed in a substance.
Color, Opacity, Hardness
The three properties that can be observed in a substance will be density, physical state, and color.
What is the substance?A kind of matter with predictable chemical composition and physical characteristics is referred to as a chemical substance. According to certain texts, a chemical compound cannot be physically divided into its component parts without rupturing chemical bonds.
A substance's physical property is a quality that can be seen or quantified without affecting the substance's identity. Color, density, hardness, and boiling and melting points are examples of physical qualities. The capacity of a material to go through a certain chemical transition is described by its chemical property.
The three properties that can be observed in a substance will be density, physical state, and color.
The three characteristics of a substance that can be seen are its density, physical condition, and color.
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How are science and technology the same
Answer:
Science is the study of the natural world by collecting data through a systematic process called the scientific method. And technology is where we apply science to create devices that can solve problems and do tasks. Technology is literally the application of science
Explanation:
what is 6,000 in scientific notation
6,000 in scientific notation is 6 x 10^3.
6 x 10^3 = 6,000
Hope this helps ! <3
SOMEONE HELP ME SOLVE (A, B, C, D, E, F) WILL MARK BRAINLIEST the first page shows an example!!
Answer:
Its C
Explanation:
A cliff diver from the top of a 100 (m) cliff. He begins his dive by jumping up with a velocity of 5 (m/s) a. How
long does it take for him to hit the water below? b. What is his velocity right before he hits the water?
Answer:
A.) 4.81 seconds
B.) 44.6 m/s
Explanation:
He begins his dive by jumping up with a velocity of 5 (m/s).
Let us first calculate the maximum height reached by using third equation of motion
V^2 = U^2 - 2gH
At maximum height, V = 0
0 = 5^5 - 2 × 9.8H
19.6H = 25
H = 25 /19.6
H = 1.28 m
The time taken for the diver to reach the water from the maximum height can be calculated by using second equation of motion.
Where height h = 1.28 + 100 = 101.28 m
h = Ut + 1/2gt^2
As the diver drop from maximum height, U = 0
101.28 = 1/2 × 9.8 × t^2
4.9t^2 = 101.28
t^2 = 101.28/4.9
t^2 = 20.669
t = sqrt ( 20.669)
t = 4.55s
As the diver jumped up, the time taken to reach the maximum height will be
Time = 1.28 / 5 = 0.256
The time taken for him to hit the water below will be 0.256 + 4.55 = 4.81 seconds
B.) Velocity right before he hits the water will be
V^2 = U^2 + 2gH
But U = 0
V^2 = 2 × 9.8 × 101.28
V^2 = 1985.09
V = 44.6 m/s
A.) The time taken should be 4.81 seconds
B.) The velocity should be 44.6 m/s
Calculation of the time taken and velocity:Here we used third equation of motion
V^2 = U^2 - 2gH
At maximum height, V = 0
Now
0 = 5^5 - 2 × 9.8H
19.6H = 25
H = 25 /19.6
H = 1.28 m
Here the second equation of motion.
Here height h = 1.28 + 100 = 101.28 m
So,
h = Ut + 1/2gt^2
Since the diver drop from maximum height, U = 0
So,
101.28 = 1/2 × 9.8 × t^2
4.9t^2 = 101.28
t^2 = 101.28/4.9
t^2 = 20.669
t = sqrt ( 20.669)
t = 4.55s
Now
Time = 1.28 / 5 = 0.256
Finally the time should be
= 0.256 + 4.55
= 4.81 seconds
B.)
We know that
V^2 = U^2 + 2gH
But U = 0
So,
V^2 = 2 × 9.8 × 101.28
V^2 = 1985.09
V = 44.6 m/s
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A car, initially traveling 24.0ft/s, steadily speeds up to 58.0ft/s in 5.40s. Determine all unknowns and answer the following question.
How far did the car travel during this time?
Answer:
acceleration = 6.29 ft^2/s
distance traveled by car = 405 ft
Explanation:
formula 1 : u = v - (a*t)
where u = initial velocity
v = final velocity
a = acceleration
t = time.
solving for acceleration.
24 = 58 - (a*5.4)
a = (58 - 24)/ 5.4
a = 340/ 54 = 6.29 ft^2/s
formula 2: v = d/t - (a*t/2)
58 = d/5.4 - ((340*54)/20)
d = 405 ft
Human activities can have positive and negative effects on the environment Humans can benefit natural areas by CA throwing waste products in these areas. B. removing all the vegetation from these areas. c. polluting the areas by burning fossil fuels. D. preserving the natural resources that they provide
Answer:
D
Explanation:
Clearly you can't help the environment by throwing waste in the area, polluting it, or burning it all up, so D would be our only option.
Have a good day :)
Where mud you be standing if the Sun appears to be directly overhead at noon
Answer:
A
Explanation: