Explanation:
mass of the body=30kg
area on which it is exerting pressure=400 cm2 to m2
=4m2
pressure it exerts=?
the formula for finding pressur in physics is F/A where the mass of the body is the force implied while area is taken as area
therefore:pressure=F/A
=30/4
=7.5 kgm/s2
=
Answer:
7500 N/m²
Explanation:
The formula for finding pressure = force/area
force = 30 kg we convert this to newtons.this is because pressure is in N/m²
30 x 10 = 300N
Area = 400cm² we convert to m² = 400/10000 = 0.04
pressure = force/ area
pressure = 300/0.04 = 7500 N/m²
If you need any more explanation pls do mention in the comment section so that i can help more.
Hope this helps and if it does mark as branliest answer thx
What causes an electric current in a wire?
Well let's analyse.
First we know Ohm's law of resistance that states:
[tex]R=\dfrac{U}{I}[/tex]
Where R is resistance, U is voltage and I is current.
If we express current we get:
[tex]I=\dfrac{U}{R}[/tex]
Because resistance cannot be equal to 0 (violation of mathematical law) the only thing that may cause current being zero is voltage.
Which means that as long as your voltage is bigger than 0V then there will be current (if we are talking about AC).
So to answer the question: Electric current is caused by voltage and regulated by resistance.
Hope this helps.
r3t40
More light is transmitted through a translucent material than through an opaque material. True or false?
true should be right if it is
True, More light is transmitted through a translucent material than through an opaque material.
Answer: A
Explanation
Depending on the ability to pass the light through the body, materials can be classified into transparent material, translucent material and opaque material.
Transparent materials are those that are able to pass most of the light hitting it. Examples are water, glass etc.
Translucent materials are able to pass some portion of light through them. Example - plastic.
Opaque materials are those in which light will not pass through. Majority of the light is reflected or absorbed. Example- wood.
What efficiency of a car's engine when heat input is 200,000 joules and waste heat is 150,000 joules?
A. 75%
B. 35%
C. 25%
D. 85%
The answer is 25% because 50,000 is 25% of 200,000
The efficiency of a car's engine when given the heat input and waste heat is 50%.
Explanation:The efficiency of a car's engine can be calculated using the formula:
Efficiency = (Useful Output Energy / Input Energy) x 100%
In this case, the heat input is 200,000 joules and the waste heat is 150,000 joules. Therefore, the efficiency can be calculated as:
Efficiency = (200,000 - 150,000) / 200,000 x 100% = 50%
So, the correct answer is not provided in the options. The efficiency of the car's engine is 50%.
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Which astronomer supported the belief that Earth was at the center of the universe, while all other planets and celestial objects orbited around it?
A) Kepler
B) Brahe
C) Ptolemy
D) Hubble
Answer:
c. Ptolemy
Explanation:
Ptolemy was the one to believe that other planets and celestial objects orbited around the earth
Hello There!
The answer to your question is C) Ptolemy
Claudius Ptolemy was famous for being a greek astronomer. He was the one who introduced the "Geocentric Theory"
What is the equivalent resistance of the circuit
Answer:
18
Explanation:
need help with both questions
Answer:
b then c
Explanation:
Use the drop-down menus to complete the statements.
have a definite shape and volume.
do not have a definite volume or shape.
have a definite volume, but the shape may change.
Answer:
solids have definite shape and volume, liquids have definite volume, but no definite shape, gas has no definite shape or volume. I hope that this is what you was looking for.
Answer:
Solids
Gases
Liquids
Explanation:
Solids have the strongest inter-molecular forces in them, this causes them to have a definite shape and volume.
Gases have the weakest inter-molecular forces in them, this causes them not to have a definite volume or shape. Moreover gases are compressible which means with enough pressure the volume may change for the same number of particles.
Liquids have weaker inter-molecular forces than solids but stronger than gases, this causes them to have a definite volume, but indefinite shape.
what must be the same for any two resistors that are connected in series ?
a. the potntial diffrence across each
b. the rate at which charge moves through each
c. the rate at which energy is used by each
d. the resistance to the flow of charge of each
Answer:
b. the rate at which charge moves through each
Explanation:
When two resistors are connected in series, they are connected in the same branch of the circuit.
This means that the current flowing through each resistor is the same.
However, current is defined as the rate at which charges move:
[tex]I=\frac{q}{\Delta t}[/tex]
where q is the amount of charge that flows through a given point in a time interval [tex]\Delta t[/tex].
Therefore, the correct answer is
b. the rate at which charge moves through each
Answer:
b. the rate at which charge moves through each
Explanation:
If the strength of the magnetic field at A is 5 units, the strength of the magnetic field at B is
SH
540 units
64 units
25 units
125 units
BEST QUESTION
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Calculate the strength of the magnetic field at point B based on given data.
The strength of the magnetic field at B can be calculated using the inverse square law formula:
BB = BA * (dA/dB)2
Given BA = 5 units and dA = 1 unit, if dB = 3 units then BB = 5 * (1/3)2 = 5/9 = 0.56 units.
Therefore, the strength of the magnetic field at B is approximately 0.56 units.
What types of energy are involved in a chemical reaction
Final answer:
Chemical reactions involve the conversion of thermodynamic energy and kinetic energy. Thermodynamic energy changes determine if a reaction is exothermic or endothermic, while kinetic energy is needed to overcome activation energy. Potential energy stored in chemical bonds is often converted into other forms like mechanical kinetic energy.
Explanation:
Chemical reactions always involve changes in energy. There are two main types of energy relevant to reactions: thermodynamic energy and kinetic energy. Thermodynamic energy is related to the energy changes when reactants convert to products, which can be either released or absorbed. This type of energy change defines whether a reaction is exothermic or endothermic. Kinetic energy, on the other hand, is the energy that reacting molecules must possess to overcome the energy barrier to react and form products, known as the activation energy.
In the course of a reaction, chemical bonds break and new ones form. The energy stored in these bonds is a form of potential energy. When substances convert, there is a conversion of energy forms - for example, chemical potential energy can be converted to mechanical kinetic energy, such as in a car engine where the combustion of gasoline moves pistons.
The molecular mass of a gas is
(select all that apply)
A. independent of the type of gas
B. the same number as the atomic (or molecular) mass, but measured in grams
C. dependent on the temperature
D. the mass of a mole of the gas
Answer:
b
Explanation:
Then the mass of the gas divided by the moles will give the molar mass. Now divide g by mol to get the molar mass. Since N has a molar mass of 14 g/mol and O has a molar mass of 16 g/mol, the formula N2O would produce the correct molar mass.
sing the Law of Gravitation, explain why the moon orbits the earth and the planets orbit the sun.
Bohr found experimental evidence for his atomic model by studying
Answer:
Bohr found experimental evidence for his atomic model by studying line spectra.
Answer:
Bohr found experimental evidence for his atomic model by studying line spectra.
Line Spectra is plural of a line spectrum and a line spectrum is an emission of light, sound, or other radiation, composed of a number of discrete frequencies or energies (a spectrum).
(\) QueTooOfficial (/)In 1859, Charles Darwin published the first edition of On the Origin of Species, which explained his observations of various groups of animals that showed great similarities but minor differences. Darwin concluded that if a population of one species separates into two different populations that live in separate locations, then over the course of many generations the different populations can develop into different species. This idea predicted many future biological findings and became the basis of modern biology.
Darwin’s explanation for why different species exist is best described as a(n)
law.
theory.
inquiry.
hypothesis.
Answer:
The answer is theory. Hope that's the right answer
Answer: theory.
Explanation:
A scientific theory is the detailed explanation for the cause of the natural process, or natural event or natural phenomena. The explanation is based upon detailed experimental trials and direct observation.
The Charles Darwin "On the Origin of Species" is the theory which is considered as the foundation of evolutionary biology.
The wavelength of a wave on a string is 1.2 meters. If the speed of the wave is 60 meters/second, what is its frequency? A. 0.20 hertz B. 2.0 hertz C. 50 hertz D. 10 hertz E. 15 hertz
C. 50Hz. The wavelength of a wave on a string is 1.2m with a speed of 60m/s its frecueny is 50Hz.
The wavelength of a wave describes how long the wave is, and can be represented by the formula λ = v/f, where λ is the wavelenght in meters, v is the speed of the wave in m/s, and f is the frecuency of the wave in Hertz.
The wavelength of a wave on a string is 1.2m and its speed is 60m/s, to calculate its frecuency we have to clear f from the equation λ = v/f. So:
f = v/λ
f = (60m/s)/(1.2m)
f = 50 1/s = 50Hz
Answer:
c
Explanation:
An object that weighs 75n is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force on this object is 30 N to the left. What is the acceleration of the object?
Answer:
2.67 N/kg
Explanation:
We are given that an object that weighing 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right with 30 N friction to the left.
We are to find the acceleration of the object.
Mass = 75/10 = 7.5 kg
Acceleration = Net Force / mass
Net force = Horizontal force - Frictional force = 50 - 30 = 20
Acceleration of the object = 20 / 7.5 = 2.67 N/kg
Answer:
[tex]2.61m/s^2[/tex]
Explanation:
We first of all find the net force F acting on the object. The frictional force [tex]F_f[/tex] and the pulling force [tex]F_p[/tex] act in opposite directions. Hence the net force is given as follows;
[tex]F=F_p-F_f...............(1)\\Given;\\F_p=50N\\F_f=30N\\Hence;\\F=50-30\\F=20N[/tex]
It is this net force that brings about the acceleration of the body. Recall that
[tex]F=ma..............(2)[/tex]
where m is the mass of the object and a is the acceleration.
The weight W of the object is given, hence we obtain its mass as follows;
[tex]W=mg..............(3)[/tex]
where g is acceleration due to gravity taken as [tex]9.8m/s^2[/tex].
Given;
W = 75N
[tex]75=m*9.8\\m=\frac{75}{9.8}\\m=7.65kg[/tex]
From equation (2), we have
[tex]a=\frac{F}{m}..................(4)[/tex]
Hence;
[tex]a=\frac{20}{7.65}\\a=2.61m/s^2[/tex]
Which statement is an example of the law of conservation of energy? A soccer ball eventually stops because its energy disappears. When a light bulb is turned on, electrical energy is converted to light and heat. An automobile engine burns gasoline to converts its chemical energy to electrical energy.
-- A soccer ball eventually stops because its energy disappears. No. Energy does NOT "disappear". That would exactly violate the whole concept of energy conservation.
-- When a light bulb is turned on, electrical energy is converted to light and heat. Gosh Yes ! This statement tells where the energy comes from, what happens to it, and where it goes. In a sloppy floppy way, it incorporates all of the highlights of energy conservation.
-- An automobile engine burns gasoline to converts its chemical energy to electrical energy. No. When you look closely at this statement, MOST of the energy involved is missing and unaccounted for. The statement only accounts for starting the motor and running the car radio. It completely ignores the huge amount of mechanical energy produced from the gasoline.
Answer:
No
Yes
No
Explanation:
;0 literally just did it lol
Which unit is equivalent to j/s
To be honest, there's no sure way to answer that, because you haven't defined your terms and we can't be sure of what j or s might be.
Tell you what I'll do:. I'll assume definitions for j and s, and then I'll answer the question that I invented.
Assume that j stands for Joule, the unit of energy. And assume that s stands for 'second', the unit of time.
Then j/s is the rate of transferring energy or doing work.
Its unit is the Watt, equivalent to 1 Joule per second.
In your system of notation, it would be 'w' .
Answer:
Watts
Explanation:
Which circuit has exactly two resistors connected in parallel
Answer: D
Explanation:
Option(D) is the two resistors connected in parallel.
ResistorA circuit exists simply a closed loop through which charges can continuously move. To establish that charges exist not only moving through the light bulb filament but also through the wires connecting the battery pack and the light bulb, a variation on the above activity exists completed.
A resistor exists as an electrical component that limits or restrains the flow of electrical current in an electronic circuit. Resistors can even be utilized to furnish a specific voltage for an active device such as a transistor.
A resistor exists as a passive two-terminal electrical element that implements electrical resistance as a circuit element. In electronic circuits, resistors exist used to reduce current flow, adjust signal levels, separate voltages, bias active elements, and terminate transmission lines, among other uses.
Resistors exist in parallel if their terminals are connected to identical two nodes. The equivalent overall resistance exists smaller than the smallest parallel resistor.
Here from the given options Option(D) is the two resistors connected in parallel.
It is shown below (option d).
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The name of the Sl unit for magnetic field strength, such as that created around a current-carrying wire, is the _________
pls help!!!!!
Answer: Tesla
Explanation:
Answer:
Tesla
Explanation:
Edge 2021
Which Of the following statement is false ? A.batteries should never be stored on metal trays or outside in the Elements)B, battery acid cannot be neutralized)C.Do not stack batteries on top of each other)D.never put a damaged battery in a dumpster.
I
Answer:
B
Explanation:
Since battery acid is an acid, it can be neutralised as all acid can be neutralised.
The battery acid can be easily neutralized, and therefore the statement that it cannot be neutralized is false statement.
Answer: Option B
Explanation:
The battery acid has acidic pH that is less than 7 pH but are actually weak acids and so they have pH around 6 or 7. In order to neutralize the acid, pH is to be raised achieving the neutral pH which is 7.
This can be done using the baking soda. Baking soda has alkaline property thereby, addition of baking soda will result into neutralization reaction, causing the battery acid to neutralize.
Which type of bond is found between the atoms of a molecule?
A. Metallic
B. Delocalized Electron
C. Covalent
D. Ionic
Hello There!
The type of bond that is found between the atoms of a molecule is called "COVALENT" bond.
A covalent bond is where two atoms share a pair of electrons.
The bond between the atoms of molecule is Covalent bond.
Answer: Option C
Explanation:
Covalent bond due to its phenomenal activity is also known as molecular bond. The electron pairs are shared between the atoms, these shared electron pairs are known as "shared pairs or bonding pairs".
This type of covalent bonding establishes balance between the atoms against attractive and repulsive forces. Covalent bonds are more common than ionic bonds.
An electric oven has a resistance of 201 ohms and a voltage of 220 V. How much current does it draw?
a) 11 A
b)1.1 A
c)1,100 A
d) 110 A
1.1 A. An electric oven with a resistance of 201Ω and a voltage of 220V drwa a current of 1.1 A.
The easiest way to solve this problem is using the Ohm's Law I = V/R.
An electric oven has R = 201Ω, and a drop of voltage V = 220v, solve using I = V/R:
I = 220V / 201Ω
I = 1.09 A ≅ 1.1 A
moral development is often defined as development of
Answer:
A sense of right and wrong.
Hi!
Let's go over the meaning of moral development before we answer.
the process thought which children develop proper attitudes and behaviors toward other people in society, based on social and cultural norms, rules, and laws.
What can we infer from this? Well, this passage tells us that moral development is a process thought.
Based on the definition, we can say that the answer would be:
A sense of right and wrong.
Does this make sense? Lmk if not!
Hope this helps!
- Melanie
An object dropped from Cliff falls with a constant acceleration of 10 metre per second square find its Speed of two seconds after it was dropped
Answer:
20 meters per second
Explanation:
If an object accelerates for 2 seconds, and accelerates by 10 meters per second, then that objects speed will be 20 meters per second, assuming hat there are no other factors involved.
Answer:
20 meters per second
Explanation:
All you have to do is multiply 10 meter by the speed of two seconds which is 20 METERS PER SECOND
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~Luis~
A man throws a football straight into the air. As it rises, it slows down. Which
type of energy is the football gaining?
Answer:
if it is slowing down than it is gaining potential energy
Explanation:
a sled of mass 8 kg slides across the ground with a friction force of 16.46 n what is μk between the sled and the ground?
a. 2.1
b. 0.49
c. 0.83
d. 0.21
D. μk = 0.21. The coefficient of kinetic friction μk is 0.21.
The key to solve this problem is using the equation of kinetic friction force Fk = μk*n, where μk is the coefficient of kinetic friction, and N is the normal force n = m*g.
Clear μk from the equation Fk = μk*n:
μk = Fk/n
With Fk = 16.46N, and n = 8kg*9.8m/s²
μk = 16.46N/(8kg*9.8m/s²)
μk = 0.21
Answer: D: .21 on apex :)
Explanation:
Which of the following has potential but not kinetic energy
Answer:- Potential energy is the amount of energy a object has while it's at rest (or not moving) Kinetic energy is how much energy a object is while it's moving
Explanation:
I don't understand what you mean by "the following" or "which of", and there are no suggestions listed to pick from.
If any of the THESE things is on this list in the place where you copied the question from, then it's the answer. If none of these is on the list, then you're on your own.
-- A bowling ball on the floor in the upstairs closet.
-- A car up on the rack having an oil-change.
-- A helicopter hovering 10-ft off the ground.
-- A mosquito hovering 10-ft off the ground.
-- A helium party balloon hovering 10-ft off the ground, with its string tied to a chair.
-- A regular party balloon full of regular air, with its string tied to a chair, and dangling down the back of the chair.
-- A regular party balloon full of regular air, tied to a hook in the ceiling, dangling down but not reaching the floor.
-- A gallon of gasoline, in the tank of your car, that has not burned yet.
-- A kitchen match, in the box, that has not burned yet.
-- A birthday candle, standing up in the middle of a rose on the cake, that has not been lit yet.
-- A stick of dynamite that has not been lit yet, lying on the ground.
-- A firecracker that has not been lit yet, lying on the ground.
-- A squirrel sitting up in the tree watching me walk by on the ground.
-- A bird sitting up in the top of the tree watching the squirrel.
-- A chewed up piece of roast beef that has not been digested yet, lying in your stomach.
-- A chewed up piece of roast beef that has not been digested yet, lying in MY stomach. (A more satisfying example)
-- A tree branch that broke off in the wind yesterday and is lying on the roof of your house.
-- The air that is right under the ceiling in your bedroom.
-- YOU, when you are fast asleep in the top bunk in your bedroom.
-- A rifle bullet that was fired straight up, reached the peak of its trajectory, and is just about to start falling downward in 0.001 second from now.
-- The rocket that was launched, went straight up for a while, ran out of fuel, continued to coast straight up for a while, reached the peak of its trajectory, and is just about to start falling downward in 0.001 second from now.
which of the statements about waves is true?
A. in longitudinal waves, particles move perpendicular to the direction the wave is traveling.
B. Both transverse and longitudinal waves can travel through water
C. Electromagnetic waves are a type of longitudinal waves.
D. In a transverse wave, particles move parallel to the direction the wave is traveling.
The true statement about waves is that both transverse and longitudinal waves can travel through water. Transverse waves oscillate perpendicularly to the wave direction, while longitudinal waves oscillate parallel to the wave direction.
The question pertains to the characteristics of different types of waves. A true statement about waves needs to accurately describe the motion of particles relative to the direction of the wave's travel.
Statement B: 'Both transverse and longitudinal waves can travel through water'. This is a true statement. Water waves are actually a combination of transverse and longitudinal waves, where the particles in water move in circular paths.
Transverse waves involve oscillations that are perpendicular to the direction the wave travels. Longitudinal waves, on the other hand, involve oscillations that are parallel to the direction of wave propagation.
light refracts because
Answer:
it travels at a different refractive index.
Explanation:
for example when light travels into water, it slows down, causing it to continue to travel at a different or another angle or direction. hope this helped!
Refraction of light occurs due to the different refractive indices of the medium in which the light travels.
Explanation:
The medium through which the light travels have different refractive indices, because of which the light rays crosses the boundary of the refractive indices. They are shifted from the travelling line according to the refractive index of the medium and hence, refraction is seen.
For example, air is medium with less refractive index as compared to glass, and therefore the light ray when enters into glass, travels slow and refracted from the actual path towards the normal of the ray.