Answer:
Linear and rotational Kinetic Energy + Gravitational potential energy
Explanation:
The ball rolls off a tall roof and starts falling.
Let us first consider the potential energy or more specifically gravitational potential energy ([tex]mgh[/tex]; [tex]m[/tex] = mass of the ball, [tex]g[/tex] = acceleration due to gravity, [tex]h[/tex] = height of the roof). This energy comes because someone or something had to do work to take the ball to the top of the roof against the force of gravity. The potential energy is naturally maximum at the top and minimum when the ball finally reaches the ground.
Now, the ball starts to roll and falls off the roof. It shall continue rotating because of inertia (Newton's first law). This contributes to the rotational kinetic energy ([tex]\frac{1}{2}I\omega^2[/tex]; [tex]I[/tex]=moment of inertia of the ball & [tex]\omega[/tex] = angular velocity).
Finally comes the linear kinetic energy or simply, kinetic energy ([tex]\frac{1}{2}mv^2[/tex]) which is caused due to the velocity [tex]v[/tex] of the ball.
What is ohms law for science
Answer:
Explanation:
According to ohm's law
The current flowing through the wire is directly proportional to the potential difference applied across its ends , provided the temperature and other physical conditions of the wire like stresses and strains remains constant .
What is the chemical formula of water?
A)N2O
B)H2O
C)NH3
D)HO3
Answer:
B H2O.
Explanation:
Because H2O stands for hydrogen, which has the amount of 2. And O stands for oxygen, which is by itself. When you put that together it makes H2O.
5) Consider pushing a 50.0 kg box through a 5.00 m displacement on both a flat surface and up a
ramp inclined to the horizontal by 15.0°. In both cases, you apply a force of 100.N parallel to the
surface (parallel to the floor or parallel to the ramp). Calculate the work done by:
a) the gravitational force as the box is pushed across the flat ground
b) the gravitational force as the box is pushed up the ramp
c) the force you apply as the box is pushed across the flat ground
d) the force you apply as the box is pushed up the ramp
a) The work done by the gravitational force on the flat surface is zero
b) The work done by the gravitational force on the ramp is -634 J
c) The work done by the applied force on the flat surface is 500 J
d) The work done by the applied force on up along the ramp is 500 J
Explanation:
a)
The work done by a force is given by the equation
[tex]W=Fdcos \theta[/tex]
where
F is the magnitude of the force
d is the dispalcement of the object
[tex]\theta[/tex] is the angle between the direction of the force and of the displacement
In this problem, we want to calculate the work done by the gravitational force as the box is pushed across the flat ground.
We immediately notice that the gravitational force acts downward, while the displacement is horizontal: therefore, the angle between force and displacement is [tex]90^{\circ}[/tex]; this means that [tex]cos 90^{\circ}=0[/tex], and therefore, the work done is zero:
[tex]W=0[/tex]
b)
In this case, the box is pushed along the ramp. We have:
[tex]F=mg=(50.0)(9.8)=490 N[/tex] is the magnitude of the force of gravity, where
m = 50.0 kg is the mass of the box
[tex]g=9.8 m/s^2[/tex] is the acceleration of gravity
d = 5.00 m is the displacement of the box along the ramp
The ramp is inclined to the horizontal by [tex]15.0^{\circ}[/tex], therefore the angle between the force of gravity and the displacement of the box (moving up along the ramp) is:
[tex]\theta=90^{\circ}+15^{\circ}=105^{\circ}[/tex]
Therefore, the work done by gravity in this case is:
[tex]W=(490)(5.00)(cos 105^{\circ})=-634 J[/tex]
c)
In this case, we want to calculate the work done by the force you apply as the box is pushed across the flat ground.
Here we have:
F = 100.0 N (force applied)
d = 5.00 m (displacement of the box)
[tex]\theta=0^{\circ}[/tex] (the force is applied parallel to the flat surface, therefore force and displacement have same direction)
Therefore, the work done by the force you apply on the flat ground is:
[tex]W=(100.0)(5.00)(cos 0^{\circ})=500 J[/tex]
d)
In this last case, we want to calculate the work done by the force you apply as the box is pushed up along the ramp.
This time we have:
F = 100.0 N (force applied is the same)
d = 5.00 m (displacement of the box is also the same)
[tex]\theta=0^{\circ}[/tex] (the force is applied parallel to the ramp, therefore force and displacement have again same direction)
Therefore, the work done by the force you apply while pushing the box along the ramp is:
[tex]W=(100.0)(5.00)(cos 0^{\circ})=500 J[/tex]
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A 0.90-kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 4.0 N for a distance of 3.0 m. How much farther would the force have to act for the block to have 61 J of kinetic energy?
Answer:
12 m
Explanation:
Work = change in energy
W = ΔE
Fd = ΔE
(4.0 N) d = 61 J
d = 15.25 m
Rounded to two significant figures, the distance the force would have to act over is 15 m, which is 12 m more than the 3.0 m it traveled.
Final answer:
To calculate the additional distance needed for the block to have 61 J of kinetic energy, we used the work-energy theorem and found that after applying a force of 4 N over 3 m, the kinetic energy is 12 J. An additional 49 J is needed, resulting in a requirement of an additional 12.25 m for the force to act upon.
Explanation:
To determine how much farther the force would have to act for the block to have 61 J of kinetic energy, we'll first use the work-energy theorem, which states that the work done on an object is equal to the change in its kinetic energy (KE). Initially, the block has 0 J of kinetic energy since it's at rest, and the work done by a constant force is W = F * d, where F is the force and d is the distance the force is applied over.
Since 4 N of force is applied over 3 m, the work done is:
W = 4 N * 3 m = 12 J
This means the kinetic energy of the block is now 12 J after the force has been applied for 3 m. To reach 61 J of kinetic energy, the block needs an additional:
KEneeded = 61 J - 12 J = 49 J
Now, we can find the additional distance (dadditional) required using the same work done equation:
49 J = 4 N * dadditional
dadditional = 49 J / 4 N = 12.25 m
Therefore, the force would have to act over an additional 12.25 m to give the block 61 J of kinetic energy.
What is the difference between relative time and absolute time?
Final answer:
Relative time determines the sequence of events without specific ages, while absolute time gives a precise measurement of age or date. Geologists use relative dating for stratigraphy and absolute dating for techniques like carbon dating. Time dilation in relativity illustrates that the rate of time is relative to the observer's motion.
Explanation:
The difference between relative time and absolute time lies in how they quantify the duration and sequence of events. Relative time refers to the sequence of events without assigning a specific age or date to them; it's a way to determine the order in which events have occurred. For instance, geologists use relative time to assert that one rock layer is older than another. On the other hand, absolute time or radiometric dating provides a precise measurement, giving an actual number or date to an event or object, such as specifying that a rock layer is 300 million years old.
These concepts are critical in fields such as geology, paleontology, and astronomy. In special relativity, the concept of time dilation shows that absolute time is not a fixed unit across all references, as the observed rate at which time passes depends on the observer's relative motion.
An example of relative dating would be using stratigraphy to understand that one geological layer is younger than the layer below it, while an example of absolute dating would be using carbon dating to determine the exact age of an archaeological object.
Burning oil and coal adds to the atmosphere.
A)phosphorous
B)carbon dioxide
C)oxygen
Answer:
carbon dioxide
Explanation:
Flexibility is a key characteristic for all leadership styles.
Please select the best answer from the choices provided.
T
F
Explanation:
the answer is true....maybe
Flexibility Leaders can able to adapt changes in circumstances and modify the way of approaching. Hence, the option A is correct.
What is Flexible Leadership?Flexibility in leadership is the important quality for the leaders. It helps the leaders to adapt changes in their leadership style and serves the best for their team.
Flexible leaders can modify their style and way of approaching the situations. Those leaders can earn the trust of the people and encourage new ideas to increase productivity.
They can approach the situations in creative manner and incorporate new innovation and overcome the challenges. Flexible leaders enhance the sustainable growth and profit.
Hence, Flexibility is a key characteristic for all leadership styles is True.
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The right-hand rule predicts which of the following?
The direction of the force on a charged object moving in a gravitational field.
The direction of the motion of a charged object moving through an electric field.
The speed of a test charge through a magnetic field.
The direction of the force on a charged object moving through a magnetic field.
Answer:
The direction of the force on a charged object moving through a magnetic field.
Explanation:
When considering the motion of a charged particle in a magnetic field, the important vectors are the magnetic field B, the velocity of the particle v, and the magnetic force exerted on the particle F. The vectors are all perpendicular to each other. As demonstrated by the right-hand rule.
6) Consider a 10.0 kg block of wood that's released from rest at a distance 20.0m above the
ground and assume ground level is the point of zero gravitational potential energy. Calculate:
a) the initial gravitational potential energy of the block upon release
b) the translational kinetic energy of the block just before it hits the ground.
c) the translational kinetic energy of the block when it has fallen half the distance to the
ground.
d) the speed of the block when it has fallen half the distance to the ground.
Explanation:
a) Potential energy is weight times height.
PE = mgh
PE = (10.0 kg) (9.8 m/s²) (20.0 m)
PE = 1960 J
b) Energy is conserved. As the block falls, potential energy is converted to kinetic energy. Just before the block lands, all of the potential energy has been converted to kinetic energy.
KE = 1960 J
c) When the block has fallen half the distance, half the potential energy has been converted to kinetic energy.
KE = 1960 J / 2
KE = 980. J
d) Kinetic energy equals half the mass times the square of the velocity.
KE = ½ mv²
980. J = ½ (10.0 kg) v²
v = 14.0 m/s
a person drops apple from window and it takes about 5s to reach the ground. Determine the height of the wimdow from the ground
Answer:
122.5 m
Explanation:
Given:
Time taken by apple to reach ground (t) = 5 s
Acceleration of the apple is due to gravity (g) = 9.8 m/s²
The displacement of the apple is equal to the height of window (h) = ?
As the apple is dropped, the initial velocity is, [tex]u=0\ m/s[/tex]
Now, using Newton's equation of motion along the vertical direction that relates displacement, initial velocity, acceleration and time taken, we have:
[tex]h=ut+\frac{1}{2}gt^2[/tex]
Plug in the given values and solve for 'h'. This gives,
[tex]h=0+\frac{1}{2}\times 9.8\times 5^2\\\\h=4.9\times 25=122.5\ m[/tex]
Therefore, the height of the window above the ground is 122.5 m.
A friend is making vegetable soup. he add some salt to the simmering broth. the salt dissolves, and your friend says the broth saltiness it’s just right. after two more hours of cooking on the stove top the broth is way too salty, what happened?
Answer:
It is due to the effect of temperature on our taste receptors.
Explanation:
The taste receptors on our tongue is extremely sensitive.It can vary the taste of same element due to difference in temperature. So cooking further, the temperature of that food is increased which makes it taste more saltier than before.The solubility may also have the effect on this case because solubility increases with the increase in temperature. So at high temperature salt may expand and dissolve more to make the food saltier than before.Which is an example of physical weathering?
(1 point)
acid rain breaking down compounds in
rock statues
rock breaking apart when it falls from a
cliff
oxygen interacting with minerals in rock
bits of iron in rock rusting when exposed
to oxygen and water in
Answer:
Rock breaking apart when it falls from a cliff
Rock breaking apart when it falls from a cliff is an example of physical weathering (option B)
What physical weathering?Physical weathering, also known as mechanical weathering, involves the physical breakdown of rock into smaller pieces without changing its chemical composition.
In this case, the force of gravity and the impact of the falling rock cause it to break into smaller fragments, which is a mechanical process and a common example of physical weathering. The other options involve chemical weathering processes.
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distinguishing sound and electromagnetic waves
Electromagnetic waves are not mechanical and transverse in nature, while
Sound waves are mechanical and longitudinal
Explanation:
In physics, waves are classified into two types:
Mechanical waves are those where the vibration is produced by the vibrations of the particles in a medium, therefore they need a medium to propagateElectromagnetic waves are those produced by the oscillations of electric and magnetic fields; they do not a medium to propagate, since they can travel through a vacuumMoreover, depending on the direction of the vibration, waves are further classified into:
Transverse waves: those where the direction of the vibration is perpendicular to the direction of propagation of the waveLongitudinal waves: those where the direction of the vibration is parallel to the direction of propagation of the waveElectromagnetic waves are not mechanical and transverse in nature (the oscillations of the electric and magnetic fields occur in a plane perpendicular to the direction of the wave), while
Sound waves are mechanical and longitudinal (the vibrations of the particles of the medium is back-and-forth along the direction of propagation of the wave)
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Plant and animal cells make exact copies through the process of)mitosis.B)oxidation.C)segmentation.D)interactive replacement.
Answer:
(A) Mitosis
Explanation:
Solar System 101: How is Venus’ rotation different than most planets? Question 3 options: A.It spins the opposite direction of most planets. B.It is hotter. C.It doesn't rotate. D.It spins the same as Earth.
A. It spins the opposite direction of most planets
Explanation:
Venus is not close to earth but still, it is very hot. Venus's atmosphere consists of a thick layer of greenhouse gases, carbon dioxide and the clouds in Venus is made up of sulfuric acid.The rotation of Venus is very slow, it takes around 243 days compared with earth to finish one rotation. Venus is different because it spins in the opposite direction to earth and also to most of the other planets.Venus does not have moons as mercury.A weightlifter lifted 800 Newtons to a height of 2.5 meters. What is the power output if this was
done in 1.22 seconds?
The power required is 1.6 kW.
Answer:
Explanation:
Power is defined as the amount of work done on any object for a given time interval. In other words, power is the amount of force required to move an object in a given period of time.
Power = Work done / time taken for that work done.
Here the force is given as 800 N and the displacement is given as 2.5 m, while the time required for the displacement is given as 1.22 seconds.
So the power will be ratio of the product of force acting on the weightlifter, displacement of the weight to the time taken for that displacement.
Power = (800×2.5)/1.22 =1639 W
So the power required is 1.6 kW.
Types of mechanical waves include
transverse waves.
longitudinal waves.
surface waves.
all of the above.
Mechanical waves are categorized into transverse, longitudinal, and surface waves. Transverse waves have disturbances perpendicular to wave direction, longitudinal waves have parallel disturbances, and surface waves are a combination of both.
Explanation:Mechanical waves can be classified based on the type of motion involved in the wave's propagation. There are mainly two categories of mechanical waves, namely transverse waves and longitudinal waves. However, there is also a third category known as surface waves, which is a combination of both transverse and longitudinal motions.
Transverse waves are characterized by a disturbance that moves perpendicular to the direction of wave propagation. An example of a transverse wave is a wave on a string or an electromagnetic wave, such as visible light. Whereas, longitudinal waves have disturbances that move parallel to the direction of propagation, like sound waves in air or water.
Surface waves are typically observed in fluids, like water waves in the ocean, where the motion of the particles at the surface follows a circular path, thus involving both longitudinal and transverse motions.
Therefore, when considering the types of mechanical waves, the answer would be all of the above as it includes transverse waves, longitudinal waves, and surface waves.
You are driving on a freeway and notice a small car (very small) cut off a big truck. Explain why it is a bad idea for the small car to cut off a very big truck?
Answer: small cars can stop and go fast big trucks can not
Explanation:
Mars has two moons, Phobos and Deimos, with masses 1.08 x 1016 kg and 1.8 x 1015 kg, respectively. How far apart
are the two moons when the gravitational force between them is 3 x 1012 N? Do not use scientific notation. Round
to one decimal
Answer:
20784.6m
Explanation:
Check attachment
I hope this was helpful, Please mark as brainliest
The Milky Way measures _________ light years in diameter.
Answer:
The Milky Way is about 1,000,000,000,000,000,000 km (about 100,000 light years or about 30 kpc) across. The Sun does not lie near the center of our Galaxy. It lies about 8 kpc from the center on what is known as the Orion Arm of the Milky Way.
Calculate the centripetal force on a 4.5 kg sensor that is attached at the end of a 90.0-m long wind turbine blade that is rotating at 1.00 rev/s.
Final answer:
The centripetal force on the sensor is 2544.06 N.
Explanation:
To calculate the centripetal force of on the sensor attached at the end of the wind turbine blade, we can use the formula:
F = m * r * ω²
Where F is the centripetal force, m is the mass of the sensor, r is the radius of the wind turbine blade, and ω is the angular velocity.
Substituting the given values, we have: F = 4.5 kg * 90.0 m * (2π rad/s).
After calculating, we get the centripetal force on the sensor to be 2544.06 N.
The “Big Bang” is an example of what type of scientific statement?
Answer:
The big bang is a example of scientific theory
Explanation:
The Big Bang is an example of a scientific theory about the origins and evolution of the universe. It has been substantiated through numerous tests and observations, specifically those related to the cosmic microwave background radiation and the expansion of the universe.
Explanation:The 'Big Bang' is an example of a scientific theory. A scientific theory is an explanation for a range of phenomena that has been substantiated through repeated testing and observation. In this case, the Big Bang theory explains the origins and evolution of the universe. According to this theory, the universe originated from a singularity, a point of infinite density and temperature, about 13.8 billion years ago, and it has been expanding ever since. This theory is based on a wide range of observations, including those related to the cosmic microwave background radiation and the expansion of the universe.
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PLEASE HELP ASAP. Best answer gets BRAINIEST:
a counter weight of 13.5kg is used to help a person of a mass 62.4kg do chin ups
1. Calculate the force applied by the person if he accelerates at 1.9m/s^2
2. calculate the magnitude of the tension in the wire.
Answer:
1. Force = -623.43 N
2.Tension = 106.65 N
Explanation:
Let us call the bigger mass [tex]M[/tex], and the smaller mass [tex]m[/tex].
Since the two masses are connected to each other, they must experience same acceleration (if they didn't, the unequal acceleration will cause the string to break. )
From the free body diagram, the forces acting on the mass [tex]M[/tex] are
[tex]T - Mg-F_p[/tex],
and according to Newton Second Law, this causes acceleration [tex]a[/tex]; therefore,
(1). [tex]\boxed{ T-Mg-F_p=Ma}[/tex].
Similarly, the forces acting on the mass [tex]m[/tex] are
[tex]T -mg[/tex],
which causes the acceleration [tex]-a[/tex] (upward); therefore,
[tex]T-mg=-ma \\[/tex]
or
[tex]\boxed{ mg-T = ma}[/tex]
From this equation we solve for [tex]T[/tex] and get:
[tex]T = mg-ma \\\\T =m(g-a).[/tex]
We put this into equation (1) and get:
[tex]m(g-a)-Mg-F_p=Ma[/tex]
[tex]F_p = m(g-a)-M(g+a)[/tex]
putting in [tex]M=62.4kg,m=13.5kg,[/tex] and [tex]a=1.9m/s^2[/tex], we get:
[tex]F_p=13.5(9.8-1.9)-62.4(9.8+1.9)\\\\\boxed{ F_p=-623.43N}[/tex]
The tension in the wire is
[tex]T =m(g-a)\\\\T = 13.5(9.8-1.9)\\\\\boxed{ T= 106.65N}[/tex]
A skateboarder who travels 60 meters in 30 seconds has a speed of
Answer:
2m/s
Explanation:
Speed= distance / time
? = 60m / 30s
speed= 60/30
60/30=2
speed= 2m/s
How do molecules behave when they transition from a solid, liquid, to gas?
These graphs show measurements of the density of air as different sound waves pass a single point.
Which sound wave will most likely be perceived as the loudest?
Answer: D!
It is the option with the greatest amplitude.
Answer: The graph with the highest density of air.
Explanation: The graphs are missing, but il try to explain this problem anyways.
Soundwaves are mechanical waves, that need a medium to move (commonly, the medium is the air)
As those mechanical waves affect the air, the density of air in some areas increase and in others decrease, and when that "wave of air" impacts a receptor, like your ear, you receive the information of the sound, like pitch and intensity.
As more air impacts the receptor, more "loud" is the noise, and as you may know, density = mass/volume, so as biggest is the density of air in a point, this means that we have more mass of air at that point, which is directly related to the intensity or loudness of the sound wave at that point
With what velocity Must a 0.53 kg softball be moving to be equal to the momentum of a 0.31 kg baseball moving at 21 m/s
Answer:12.28m/s
Explanation:
momentum of baseball =mass of baseball x velocity of baseball
Momentum of baseball =0.31x21
Momentum of baseball =6.51kgm/s
For a softball to have same momentum with the baseball we can say :momentum of baseball =mass of softball x velocity of softball
6.51=0.53 x velocity of softball
Velocity of softball =6.51/0.53
Velocity of softball =12.28m/s
The velocity of the softball that must be equal to the momentum of the baseball is 12.28 m/s.
The given parameters;
mass of the soft ball, m₁ = 0.53 kgmass of the baseball, m₂ = 0.31 kgvelocity of the baseball, u₂ = 21 m/sApply the principle of conservation of linear momentum to determine the velocity of the softball;
[tex]m_1u_1 = m_2 u_2\\\\u_1 = \frac{m_2 u_2}{m_1} \\\\u_1 = \frac{0.31 \times 21}{0.53} \\\\u_1 = 12.28 \ m/s[/tex]
Thus, the velocity of the softball that must be equal to the momentum of the baseball is 12.28 m/s.
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Using what you know about the periodic table, choose all of the correct answers,
Answer:
What are the choices?
Mechanical energy that has been "lost" to friction has actually been
destroyed
O
A. True
OB. False
SUBMIT
help
Answer:
it false, APEX, i just did this one
Explanation:
Answer:
False
Explanation:
The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.
Water is made of two hydrogen atoms and one oxygen atom bonded together. Julia is describing how water undergoes a physical change when it boils. She says that the particles shift to be farther apart and that the oxygen and hydrogen separate. She also says that the total mass of the steam is the same as the initial water, and that heat energy was required to cause the change. She finishes her description by saying that the steam can be turned back into water if it is cooled
Boiling water causes molecular movement to increase without breaking H₂O bonds. It's a physical change where molecules move farther apart as steam forms. Cooling steam back into water is reversible, showcasing the unique properties of water's hydrogen bonding.
When water undergoes a physical change, such as boiling, the arrangement of the water molecules changes due to increased kinetic energy. However, the chemical composition remains the same, meaning that the hydrogen and oxygen atoms do not separate into different atoms; they stay bonded as H₂O. The molecules move farther apart, transitioning from a liquid to a gaseous state without changing their actual molecular structure. This transformation requires the input of heat energy, and it is completely reversible; if the steam (water vapor) is cooled, it will condense back into liquid water, demonstrating one of water's unique characteristics due to its ability to form and break hydrogen bonds.
During the boiling of water, the hydrogen bonds between water molecules are broken as they gain enough kinetic energy to escape into the air as steam. When water freezes, however, these molecules form a crystalline structure that is less dense than liquid water, which explains why ice floats. This phenomenon is distinctive to water and differs from most other liquids, where the solid form is denser than the liquid.