When a heavy boy and a light girl are balanced on a massless seesaw and f they both move forward so that they are one-half their original distance from the pivot point, then : nothing will happen and seesaw will still be balanced.
What is meant by principle of moment?The principle of moment states that the sum of clockwise moment is equal to the sum of anticlockwise moment.
F₁r₁ = F₂r₂
where; F₁ and F₂ are the forces applied by the boy and the girl respectively
r₁ and r₂ are the position of the boy and the girl respectively
We can conclude that if the boy and the girl were initially at equilibrium, and so, when they move equal distance apart, see-saw will still be balanced. Hence, nothing will happen; seesaw will still be balanced.
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As cars travel, oil and gasoline leaks onto the road surface. If a light rain falls, what does this do to the control of the car
When a light rain falls after oil and gasoline have leaked onto the road surface, it can cause the car to become less responsive and more difficult to control.
This is because the oil and gasoline act as a slippery layer on the road surface, which reduces the friction between the tires and the road. The rainwater can then mix with the oil and gasoline, making the layer even more slippery and reducing the vehicle's grip on the road.
To help mitigate this issue, drivers should be aware of their surroundings and the potential for slippery surfaces, and should adjust their speed and driving accordingly. Additionally, using tires with greater tread, or using more aggressive tires designed for wet and slippery conditions, can also help increase the vehicle's grip on the road.
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A particle with a positive charge of 91 - 2.10C moves in electrostatic field. At point Me, the potential f.8.10V the electric potential energy W of the particle is equal to its kinetic energy E a) Calculate the numerical value of the potential energy W b) Calculate the electric potential energy W, and the kinetic energy E., of the particle when it passes through a point with potential f.4.10 V Hint: Use the law of conservation of energy.
The potential W for given positive charge moves in electric field is 7.388KJ. The Electric potential energy and kinetic energy at a point is 3.739KJ.
What is the energy conservation law?It is impossible to produce or destroy energy. The law of conservation of energy states that energy can only be changed from one form to another. For instance, when an object falls from a specific height, its potential energy is converted to kinetic energy, and the total mechanical energy is constant throughout.
Positive charge = 912.1C
Potential at point M = 8.10V
Change in Kinetic energy = amount of work done
Potential energy = charge x potential difference
= 912.1 x 8.10
= 7.388 KJ
The electric potential energy = the kinetic energy
= 912.1 x 4.10
= 3.739 KJ
What is potential energy in electric systems?The power required to move a charge in opposition to an electric field is known as electric potential energy. A charge must be moved through a stronger electric field with more energy, but it also must be moved through a weaker electric field with more energy.
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modern seismographs rely on ________ to record the ground motion from an earthquake.
"Modern seismographs rely on inertia to record the ground motion from an earthquake."
As the seismograph shakes under the mass, the recording device on the mass records the relative motion between itself and the rest of the instrument, thus recording the ground motion.
Seismometers are devices used to measure and record seismic waves. Elastic vibrations known as seismic waves pass through the earth. A seismometer is a device used to capture these vibrations, and the graph that results from this capture is known as a seismogram.
Other magnitude scales measure various aspects of the earthquake, but the Richter scale measures the biggest wobble on the recording.
Modern Global Seismology, is a complete, self-contained primer on seismology, featuring extensive coverage of all related aspects from observational data through prediction and emphasizing the fundamental theories and physics governing seismic waves, both natural and anthropogenic.
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write down a difference between the models suggested by copernicus and kepler we use in our solar system today
QUICK PLEASE
HELP!!!!
My Science teacher does not know how to do this!!!
1. A car is driving around a curve at a constant speed of 30 mph. The car has a mass of 2000 kg and a radius of 0.5 m. Calculate the angular momentum of the car.
Answer:
To calculate the angular momentum of the car, you will need to use the formula:
angular momentum = mass * velocity * radius
Plugging in the values you provided:
angular momentum = 2000 kg * 30 mph * 0.5 m
This gives us an angular momentum of 3000 kg*m^2/s.
Is there anything else I can help you with?
Explanation:
Answer:
30000 kg*m^2/s
Explanation:
To calculate the angular momentum of the car, we can use the formula L = I * omega, where L is the angular momentum, I is the moment of inertia, and omega is the angular velocity.
We can calculate the moment of inertia of the car as follows:
I = mr^2
Plugging in the values, we get:
I = 2000 kg * (0.5 m)^2
= 500 kg*m^2
Next, we need to calculate the angular velocity of the car. To do this, we can use the formula omega = v/r, where v is the linear velocity and r is the radius of the curve.
Plugging in the values, we get:
omega = 30 mph / 0.5 m
= 60 rad/s
Now that we have the moment of inertia and the angular velocity, we can calculate the angular momentum as follows:
L = I * omega
= 500 kgm^2 * 60 rad/s
= 30000 kgm^2/s
Therefore, the angular momentum of the car is 30000 kg*m^2/s.
A 1200 kg car moving 28 m/s slows down to a stop. If the car traveled 658 meters while doing this, what was the force of friction acting on the car
A 1200 kg car moving 28 m/s decelerated until it stopped. The force of friction acting on the car is 714.9 N
Using the equation of motion:
v² = u² + 2ad
Where:
v = final velocity = 0 (since the car eventually stopped)
u = initial velocity = 28 m/s
a = acceleration
d = distance = 658 m
Hence,
0 = 28² + 2 x a x 658
a = - 0.596 m/s² (minus sign denotes deceleration)
According to the Newton second law of motion:
F = m a
Where:
F = net force = friction force
m = mass of the car = 1200 kg
a = 0.596 m/s²
Hence, the friction force is:
F = 1200 x 0.596
= 714.9 N
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The electric potential in a region of space is V=250V⋅mx2+y2√, where x and y are in meters.
What is the strength of the electric field at (x,y)=(2.6m,1.7m)?
Electric field strength at (2.6m,1.7m) is 25.9 V/m
Therefore, the term E can be used to determine the electric field intensity at a place whose coordinates are (x,y) (x,y)
V=250 (V⋅m) /√(x²+y²),
E = ∂V/∂x i + ∂V/∂y j
If I is a vector along the x axis, and j is a vector along the y axis, both of which are unit vectors because their magnitudes are one.
∂V/∂x = -250x
(x²+y²)³²
= (-250*2.6)/29.97
=> -21.68
∂V/∂x = -250y
(x²+y²)³²
= (-250*1.7)/29.97
=> -14.18
so E(2.1,3) = -21.68 i -14.18 j
E=√(∂V/∂x i² + ∂V/∂y j²)
E= √(-21.68² + -14.18²)
E=√ (470+201)= 25.9
therefore, the electric field's strength at (2.6m,1.7m) =25.9 V/m
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dry ice (carbon dioxide) changes from a solid to a gas at –78.5°c. what is this temperature in °f?
According to the given statement -109.3°F is this temperature in °f.
How is temperature defined in physics?The elastic potential energy of a particles in an item is measured by its temperature. The velocity of these particles likewise increases as the temperature rises. A thermometer or just a calorimeter is used to determine the temperature. The degree to which an object is hot or cold is measured by its temperature.
To convert a temperature from °C to °F, you can use the formula:
°F = (9/5) * °C + 32
So, -78.5°C = (9/5) * -78.5 + 32 = -109.3°F
It's important to note that dry ice, also known as solid carbon dioxide, sublimates directly from a solid to a gas at -78.5°C (109.3°F) without passing through a liquid state. It's commonly used as a refrigerant and a cooling agent in various industrial and scientific applications.
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What is the connection of your issue or event to the lens of history for determining its impact on various institutions
The lens of history can be used to understand the context and long-term effects of an event or issue on various institutions. By looking at how an event or issue fits into the broader historical narrative, it can help to understand how it has shaped and continues to shape different institutions.
For example, if we look at the Civil Rights Movement of the 1950s and 1960s through the lens of history, we can see how it impacted various institutions such as education, the legal system, and politics. It led to the desegregation of schools and universities, the dismantling of legal structures that supported racial discrimination, and the increased representation of minorities in politics. These changes had a profound and lasting impact on American society and continue to shape the country to this day.
Another example is how the COVID-19 pandemic has affected various institutions in different ways, it changed the way health systems operate and the way people interact with health services, it has also affected the way people work, learn and interact with each other, it has also changed the way people shop and consume, it also has had a significant impact on the global economy.
In both examples, by looking at the events through the lens of history, we can understand how they have changed different institutions and how those changes have shaped society over time. This understanding can help us to predict how the changes brought about by an event or issue will continue to affect institutions in the future.
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A 30-meter line is used to secure a helium-filled balloon to the ground. Because of a breeze, the line makes and angle of approximately 75o with the ground. What is the height of the balloon
The approximate height of the balloon from the ground is calculated to be 28.98 m.
Based on the given information, you can draw a right triangle where the hypotenuse side is given as 30 m and the ground makes 75° with the hypotenuse.
Let x be the height of the balloon from the ground.
And α be the given angle.
sin α = opposite side / hypotenuse
The opposite side gives the height of the balloon from the ground.
So, sin 75° = x/30
0.966 = x/30
x = 28.98 m
Thus, the height of the balloon from the ground is calculated to be 28.98 m.
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When blow-drying one's hair, what type of energy does one start with, and what types of energy is
it transformed to? Please respond in 1-2 complete sentences using your best grammar.
When a hair dryer is plugged into a switch, it begins to operate and converts electrical energy into heat energy. Because of this, the hair dryer produces hot air when we use it.
What is electrical energy, exactly?A atom's charged particles can move an item or start an action by using electrical energy. Electrical energy is produced by the transfer of electrons of one atom to another. A toaster or a phone charger is powered by electricity each time you plug them into a wall outlet.
How is electricity utilized?Electricity is used by people as lighting, heating, cooling, & refrigeration as well as to run machines, computers, electronics, appliances, and public transit systems. In 2021, the United States consumed over 3.93 trillion kWh, which is 13 times more power than it did in 1950.
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A box is 2.00 m wide, 3.00 m long, and 0.200 m deep. The box has a mass of 1400 kg. Calculate the
density of the box.
O 1680 kg/m³
O 1167 kg/m³
O 584 kg/m³
0.00085 kg/m³
Answer:
1167 kg/m³
Explanation:
Density = Mass / Volume = 1400 kg/ (2 m × 3 m × 0.2 m) = 1167 kg/m³
A 5.0 kg ball moving at 8.0 m/s strikes a stationary 85.0 kg man on the chest, bouncing off the man and going 2.0 m/s in the opposite direction. If the man is wearing ice skates, standing on frictionless ice, and is initially at rest, what is his final velocity
If the man is wearing ice skates, standing on frictionless ice, and is initially at rest, 0.588 m/s forward is his final velocity.
Because the sum of initial and final momentum is equal under the law of conservation of momentum, it will be expressed as
[tex]m_{b}u_{b} +m_{m}u_{m} =m_{b}v_{b}+m_{m}v_{m}[/tex]
Where m represents mass, u and v represent initial and final velocities, and subscripts b and m represent ball and man, respectively.
Because the man is initially at rest, his initial velocity is zero.
If we consider the forward direction to be positive, the backward direction when a ball bounces will be negative.
Substituting 5 kg for the mass of the ball and 85 kg for the mass of the man, the initial velocity of the ball is 8 m/s, and the final velocity is -2 m/s, we get
5*8+(85*0)=5*-2+(85v)
85(v)=50
V=0.5882352941176
To sum up, the man's forward velocity is approximately 0.588 m/s.
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What do you call someone who works on clocks?
You call it a clockmaker. A clockmaker in general define as someone who create and repair the clock which is include someone who works on clocks.
What does clockmaker do?The clockmaker or also called as horologist is a person who create and repair a clock. Before they create the clock, the clockmaker will decide theme of the clock they made then they will create a design based on psychic to determine how the clock will looks like and how its mechanism work. After the design are created, clockmaker will start to create the clock according to that design. The longest work will be the detail that they carve in the clock.
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mercury is a fluid with a density of 13 600 kg/m3. What pressure in pascals is exerted on an object under0.76 meters of mercury
The pressure exerted on an object under 0.76 meters of mercury is 101,292.8 Pascals
Pressure is defined as force exerted per unit area.
P = F/A
Where:
F = force
A = area
In this case the force is the gravitational force or weight.
w = mg
where m = mass of the substance
Since mass is equal to density times volume:
m = ρ . V
Hence,
P = mgh/A = ρgh
Where:
ρ = density of the substance.
The parameters in the problem are:
ρ = density of mercury = 13,600 kg/m³
h = 0.76 meters
g = 9.8 m/s²
The pressure is:
P = 13,600 x 9.8 x 0.76
= 101,292.8 Pascals
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Use the microscopic interpretations of temperature and heat to
explain how you can blow on your hands to warm them and also
blow on a bowl of hot soup to cool it.
When you blow on your hands to warm them, you add kinetic energy to the air molecules, which in turn raise the temperature of the air near your hands. This increase in temperature causes the molecules to move faster and transfer energy to your hands, warming them up.
When you blow on a bowl of hot soup, you transfer the kinetic energy from your breath to the molecules of the soup, which cools down the soup by reducing its temperature. Since the molecules are moving slower than they would at a higher temperature, less energy is transferred to your hands as you touch it.
You're about to lift a 5,500 lb. Truck with a bed full of sod that weighs 3,000 lbs. Your lift is rated for 8,000 lbs. Can you lift the truck safely?.
No, if the lift is rated for weight of 8000 lbs, then the truck can not be lifted safely due to excess 500 lbs of truck weight.
To understand the ability of truck for safe lifting, we need to find the total weight of the truck being lifted. The total weight of truck being lifted will be the sum of weight of truck and weight of bed full of sod present in truck.
Keep the values in formula
Total weight = 5500 + 3000
Performing addition on Right Hand Side of the equation
Total weight = 8500 lbs
Excess weight = 8500 - 8000
Performing subtraction
Excess weight = 500 lbs
Thus, truck can not be lift safely due to extra 500 lbs.
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If a cube of jello is cut into two pieces, what total property of the new pieces change?
Answers:
A. density
B. volume
C. surface area
D. mass
The total property of the new pieces that changes is the surface area. The surface area of the jello will increase.
How are the properties of a cube of jello?If a cube of jello is cut into two pieces,
The density will stay the same. The density of jello is greater than the density of the water since it is primarily made up of gelatin where the density is 1.27 g/ml. It won't change anything about its density as long as no other substance added.The volume will stay the same as long as it isn't eaten. If it is cut into two pieces, it won't change the total volume. It just becomes two parts of jello. The mass will also stay the same despite the changing shape.The surface area will change. There are two new cube sides in the cut cross-section. The total surface area will increase as the cube now becomes two cuboids (rectangular prism).Learn more about properties of a substance here:
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Why did John Harrison invent the marine chronometer?
John Harrison invented the marine chronometer so navigators were able to measure their longitude at sea precisely.
John Harrison was a self-taught carpenter and watchmaker from England. He learned his craft independently. At that time there were many disasters at sea caused by bad navigation. The British Parliament also formed the Board of Longitude which was tasked with finding someone to develop the chronometer.
Harrison also volunteered to complete the project. The chronometer was completed in 1735. Harrison continued to make improvements to the chronometer. In 1762, a marine chronometer named H4 was completed. This chronometer is notable because, after a trip to Jamaica, it was shifted by at least five seconds (1 1/4′ of longitude).
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Question
Which option is an example of a chemical property?
A. density
B. ability to react with oxygen
C. boiling point
D. color
Answer:
B. ability to react with oxygen
Explanation:
—Characteristics such as melting point, boiling point, density, solubility, color, odor, are PHYSICAL PROPERTIES.
—Properties that describe how a substance changes identity to produce a new substance are CHEMICAL PROPERTIES.
Would you expect the above compound to be aromatic?
Yes
No
Choose the correct explanations for the aromaticity of the compound. Salectal that apply.
The lone pairs on the nitrogen atoms do not corbute to aromat city.
The lone pairs on the nitrogen atoms do contribute to aromaticity.
The lone pairs on the nitrogen atoms occupy sp² hybridad orials.
The lone pairs on the nitrogen atoms occupy s hybriditals
One of the lone pairs on the oxygen atom (inside the ring) occupies apcrbital, giving a continuous system of overlapping p orbitals containing six electrons.
One of the lone pairs on the oxygen atom (outside the ring) occupies a p orbital, giving a continuous system of overlapping p orbitals containing sixx electrons.
Identify which of the following compounds is expected to be a stronger base.
Compound A
Compound B
C Compound A
C Compound B
Choose the correct explanation(s) for the above observation. Select all that apply.
The lone pair on the nitrogen atom in compound B is localized and available to function as a base.
The lone pair on the nitrogen atom in compound B is delocalized and is participating in aromaticity.
The lone pair on the nitrogen atom in compound A is localized and available to function as a base.
The lone pair on the nitrogen atom in compound A is delocalized and is participating in aromaticity.
The nitrogen atom in compound A is unavailable to function as a base, because that would cause a loss of aromaticity.
The nitrogen atom in compound B is unavailable to function as a base, because that would cause a loss of aromaticity.
Answer:
To find out if the given compound is aromatic or not use Huckle rule of aromaticity
a cyclic, planar molecule has 4n+2 π electrons, it is considered aromatic.
What does a greater refractive index mean?
A greater refractive index means that light will bend more when traveling through the material. It is also an indication of a material's optical density, which can affect the quality of light passing through it.
A greater refractive index means that light will bend more when traveling through a material. This is because the material has a higher optical density, which causes light to be refracted at a greater angle. This can be seen in the way that light will bend when it passes through a glass prism, for example. A higher refractive index also means that light will travel at a slower speed through the material, which can affect how the light is perceived. This can be beneficial for certain applications, such as in lenses and optical instruments, which rely on light being slowed down and refracted in order to create a desired effect.
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A car is moving with the velocity of 30 m/sec and its velocity increase at the rate of 2 m/sec². How much distance will cover the car in 5 seconds?
Which best explains the movement of tectonic plates?
They move several miles each year because of convection within Earth.
They move several centimeters each year because of convection within Earth.
They move several feet each year because of convection within Earth.
They move several kilometers each year because of convection within Earth.
Tectonic plates move several centimeters each year because of convection within Earth.
Tectonic plates lie on top of partially molten layer of rock known as asthenosphere. Due to the convection of the asthenosphere and lithosphere, tectonics plates move relative to each other at different rates. Each year these plates moves from 2cm to 15cm or 1 inch to 6 inch.
The movement of plates take place because of heat from radioactive processes within the planet's crust. Thes plates move toward each other and sometimes away from each other. These plates are large slab of rocks that divide earth's crust and remain move constantly to reshape the earth's landscape.
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An iron nail is more strongly attracted to the a) north pole of a magnet b) south pole of a magnet. c) north or south pole-no difference really
An iron nail is drawn to the magnet's north pole and adheres to it. The iron nail becomes a conduit for the magnetic field lines. As a result, the side that becomes attached to the North Pole serves as the South Pole.
Is an iron nail more drawn to a magnet's north or south pole?
A magnet's strength is greatest close to its poles. Therefore, the magnet's two poles will attract the greatest amount of nails.
An iron nail is more attracted to which pole of a magnet?
Iron nails are magnetically inducted to acquire the opposite polarity when they are brought close to one end of a magnet. Since opposing poles are drawn to one another,
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a car of mass 450 kg is acted on by a resultant force of 1575 N.Calculate its acceleration
Answer:
a=3.5m/s^2
Explanation:
f=ma(f=force m=mass a=acceleration)
1575=450a
a=1575/450
a=3.5m/s^2
Answer:
3.5ms^-2
Explanation:
m = 450kg, F = 1575N, a = ?
Since F = ma
Making acceleration subject of the formula
We have;
a = F/m
Substituting we have;
a = 1575/450
a = 3.5ms^-2
you are riding a bike . If you apply force of 150N , and you and the bike have a combined mass of 90KG, what will be the forward acceleration of the bike?
The acceleration of the bike is given as 1.67 m/s^2.
What is the forward acceleration?We know that the acceleration has to do with the rate of the change of the velocity of the object with time and we can be able to obtain the acceleration by the use of the Newton second law and that would now be able to give;
F = ma
F = force on bike
m = mass of the bike
a = acceleration
Then we can be able to substitute the values and obtain.
a = F/m
a = 150 N/90 Kg
a = 1.67 m/s^2
Thus is it going to have an acceleration of 1.67 m/s^2.
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Name 2 pieces of evidence for continental drift
Help me in this pls
The speed at the first quarter checkpoint is m/s. The speed at the second quarter checkpoint is m/s. The speed at the third quarter checkpoint is m/s. The speed at the finish line is m/s.
The rate at the first stage is 0.74 m/s, the rate at the castle gate is 1.40 m/s, the rate at the third checkpoint is 1.61 m/s, and indeed the speed at the end of the race is 1.89 m/s, according to the stated statement.
What is the straightforward meaning of speed?The pace at which an object's location changes in any direction is referred to as its speed. The distance traveled in relation to the time it took to travel that distance is how speed is defined. Since speed simply has a direction and no magnitude, it is a scalar number.
How is speed measured?Jack turns off Annie's vest but soon discovers he can't interrupt the train just save Jane since she's bound and thus the keys are lost. Jack rushes up his train as causes it to entirely derail in a last-ditch effort to survive, finally erupting into the streets.
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The complete question is-
Calculate the speed of the car at each checkpoint by dividing the distance between each checkpoint in meters by the change in time. Record your answers in Table C of your Student Guide.
The speed at the first quarter checkpoint is m/s.
The speed at the second quarter checkpoint is m/s.
The speed at the third quarter checkpoint is m/s
The speed at the finish line is m/s.
Answer:
Calculate the speed of the car at each checkpoint by dividing the distance between each checkpoint, in meters, by the change in time. Record your answers
:((((((((((((((( help
Answer:
I think that's Julie is moving to home with a variable speed which is 1m/sec^2
