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What is non-contact force?
A force acting between two objects without direct contact is called a non-contact force. For example, a magnet attracts another magnet without any contact.
A force acting between two objects without direct contact is called a non-contact force. For example, a magnet attracts another magnet without any contact.
See lessWhat is contact force?
The force acting between two objects through direct contact is called contact force. Like when you pull a chair closer to you, it's a touching or contact force.
The force acting between two objects through direct contact is called contact force.
Like when you pull a chair closer to you, it’s a touching or contact force.
See lessWhat is unbalanced force?
When multiple forces act on an object, if the magnitude of the force is not zero, but the magnitude and direction of the magnitude, then such a force is called an unequal or unbalanced force.
When multiple forces act on an object, if the magnitude of the force is not zero, but the magnitude and direction of the magnitude, then such a force is called an unequal or unbalanced force.
See lessWhat is balanced force?
If more than one force acts on an object, if the net effect of the force is zero, then it is called an balanced force.
If more than one force acts on an object, if the net effect of the force is zero, then it is called an balanced force.
See lessWhat is ununiform speed?
If an object does not cover an equal distance in equal time during its motion, then the speed of that object is called ununiform speed or heterogeneous speed.
If an object does not cover an equal distance in equal time during its motion, then the speed of that object is called ununiform speed or heterogeneous speed.
See lessWhat is uniform speed?
If an object covers an equal distance in equal time during its motion then the speed of that object is called uniform speed.
If an object covers an equal distance in equal time during its motion then the speed of that object is called uniform speed.
See lessWhat is the availability of solar energy of Bangladesh?
Bangladesh is a south Asian country almost with plane land and located in between latitudes 20°34' and 26°39' north and longitudes 80°00' and 90°41' east. Therefore, it is an ideal location for solar energy utilization. Daily solar radiation is 4-6.5 kWh/m². Average is 4.5 kWh/m² and day time is onRead more
Bangladesh is a south Asian country almost with plane land and located in between latitudes 20°34′ and 26°39′ north and longitudes 80°00′ and 90°41′ east. Therefore, it is an ideal location for solar energy utilization. Daily solar radiation is 4-6.5 kWh/m². Average is 4.5 kWh/m² and day time is on an average is 12 hours (10-14).
See lessWhat about the present energy demand of the world?
It is 19 TW in 2021 and in 2035 hopefully it will be 30 TW
It is 19 TW in 2021 and in 2035 hopefully it will be 30 TW
See lessHow does defibrillator machine works?
Defibrillator machine working procedure- 1. User adjusts the energy level kob and presses charge button to charge the capacitor. 2. C1 begins to charge until the the voltage on the capacitor reaches to the potential of the high voltage power supply. 3. User places the electrodes onto the patient cheRead more
Defibrillator machine working procedure-
1. User adjusts the energy level kob and presses charge button to charge the capacitor.
2. C1 begins to charge until the the voltage on the capacitor reaches to the potential of the high voltage power supply.
3. User places the electrodes onto the patient chest and presses discharge button (S1)
4. K1 relay seperates capacitor from power supply and connects it to the output circuit.
5. C1 capacitor discarges its load to the patient through L, and R. This happens in first 4-6 ms and the positive high voltage pulse is generated.
6. Magnetic fields generated around L, during the discharge produce the negative pulse that can be seen in the last 5ms.
See lessWhat is the unit of enthalpy?
S.I. unit of enthalpy is Joule. Another one unit of enthalpy is British thermal unit (BTU)
S.I. unit of enthalpy is Joule.
See lessAnother one unit of enthalpy is British thermal unit (BTU)
Who are the real founders of Facebook?
Five person are responsible for founding facebook- 1. Mark Zuckerberg 2. Eduardo Saverin 3. Dustin Moskovitz 4. Chris Hughes 5. Andrew McCollum
Five person are responsible for founding facebook-
See less1. Mark Zuckerberg
2. Eduardo Saverin
3. Dustin Moskovitz
4. Chris Hughes
5. Andrew McCollum
What is test charge?
Whether there is an electric field at a point or position. Or to measure exactly how far the electric field of one charge extends, we need another charge. If the other charge experiences any force of attraction or repulsion at any point, then it can be understood that there is an electric field. NowRead more
Whether there is an electric field at a point or position. Or to measure exactly how far the electric field of one charge extends, we need another charge. If the other charge experiences any force of attraction or repulsion at any point, then it can be understood that there is an electric field. Now the second charge we bring to test the electric field or to measure the electric field intensity, if it has an electric field of its own, it will interfere with our first charge’s electric field and measure the electric field intensity. So to measure the electric field or electric field intensity we need a charge which has no electric field. The work of which will be only to test the electric field. This charge is called the test charge.
In reality, no charge is possible without an electric field. So it is actually just an imaginary or mathematical charge. Since there is no electric field, we can say that it has no effect of its own. It is always positive for computational convenience. But it can also be negative.
See lessGive me some name of the components of hydroelectric power plant.
Components like as- - Dam and Reservoir - Spillway - Forebay - Surge tank - Penstock - Turbine - Power House - Draft tube
Components like as-
See less– Dam and Reservoir
– Spillway
– Forebay
– Surge tank
– Penstock
– Turbine
– Power House
– Draft tube
What are the part of nuclear fuel cycle?
The nuclear fuel cycles main parts are- - Uranium Mining and Milling - Conversion to UF6 - Enrichment - Fuel Fabrication - Power Reactors - Waste repository
The nuclear fuel cycles main parts are-
See less– Uranium Mining and Milling
– Conversion to UF6
– Enrichment
– Fuel Fabrication
– Power Reactors
– Waste repository
What about inelastic collisions?
In case of collision, if the total kinetic energy before the collision and the total kinetic energy after the collision between the objects participating in the collision are not equal or less, then the collision is called an inelastic collision. For example, if we say, two cars moving with a kinetiRead more
In case of collision, if the total kinetic energy before the collision and the total kinetic energy after the collision between the objects participating in the collision are not equal or less, then the collision is called an inelastic collision. For example, if we say, two cars moving with a kinetic energy of 100 joules and 150 joules collide. Now after the collision, their kinetic energies are 80 joules and 120 joules. Here the total kinetic energy before the collision is 250 joules but after the collision, the energy is 200 joules. That is, 50 joules of energy have been wasted. Since there is no conservation of kinetic energy between them, we call this collision an inelastic collision.
All the collisions in our real life are inelastic. Because when any collision occurs, there is sound, heat, etc. generated. And these are the powers. And this power is generated from the kinetic energy of the two cars. Here some of the car’s kinetic energy is consumed. So the kinetic energy after the collision is less than the previous kinetic energy.
See lessWhy is friction called a necessary nuisance?
Have we ever thought, about what would happen if there was no friction? Once someone pushed from the back of the bike, the bike would not stop. It would go on. No more fuel was consumed. We used no energy to walk. Since there is no friction, the vehicle does not make any noise. There was no noise poRead more
Have we ever thought, about what would happen if there was no friction? Once someone pushed from the back of the bike, the bike would not stop. It would go on. No more fuel was consumed. We used no energy to walk. Since there is no friction, the vehicle does not make any noise. There was no noise pollution. As a result of friction, the elevator rope would not be damaged or torn. What benefits! right?
But if you think a little deeper, you will understand how much complexity would have been created if there was no friction. If there was no friction, the bike would have continued in one stroke. But that bike could not be stopped. Because as I said earlier, there is no friction. That means no brake friction. If there was no friction, the bike would not be able to stay on the road. Its wheel would slide wherever it wanted. If there was no friction, we would not use energy to walk. But we could not stand still. It is not possible to walk on a rainy day if there are no grooves on the bottom of the shoes. Then, if there was no friction, there would be no fear of breaking the elevator rope. But if there is no friction, who will stop the elevator?
With so many everyday examples, we may think that friction is a nuisance for us. But if we think deeply about each of those examples, we will understand that without friction, those events cannot happen. So even though friction is a nuisance to us, it is necessary for us. And that is why friction is said to be a necessary nuisance.
See lessWhat about the most accepted theory of the destruction of the universe? Or What about the Big Rip Theory?
Due to the effects of discovered dark energy, it has been assumed until now that our universe will die through a Big Rip or thermal death. As we know, our universe is gradually expanding. Which has been going on since the Big Frog. The expansion speed of cosmic objects like galaxies, clusters, etc.Read more
Due to the effects of discovered dark energy, it has been assumed until now that our universe will die through a Big Rip or thermal death. As we know, our universe is gradually expanding. Which has been going on since the Big Frog. The expansion speed of cosmic objects like galaxies, clusters, etc. is supposed to slow down after a period of time under the influence of gravitational force. But the surprising thing is that they do not slow down. Rather, it is increasing gradually. That is, as they are moving away from each other, the speed of their moving away is increasing. Then surely some unknown force is working against the force of gravity. As the gravitational force weakens with expansion, the magnitude of this force becomes stronger. As a result, the tendency of all objects in the universe to move away increases. This unknown energy is called “dark energy”.
According to The Big Rip Theory, there will come a time when the gravitational force will decrease and the effect of dark energy will increase so that the planets inside the galaxy will no longer be bound by their gravitational force. As a result, the planets will move away from each other. And as our universe expands, energy will continue to spread to all points in space. By doing this, the energy density will gradually decrease. At some point, it will be close to zero. And at that moment no power can be used. No interaction will occur. The universe will come to a standstill. The molecules and atoms that make up the universe will also disintegrate. And we will take that moment as the death of this universe.
But this whole thing depends on dark energy. What is dark energy that is not well understood? If understood, we could be more sure, of what is actually going to happen.
See lessWhat is Aufbau’s principle regarding the electron arrangement of atoms?
The Aufbau principle regarding the structure of atoms is that electrons will first enter the lower energy orbitals and gradually enter the higher energy orbitals. Due to the greater stability in the lower energy levels, the electron follows such a continuum in entering orbitals. The formula for deteRead more
The Aufbau principle regarding the structure of atoms is that electrons will first enter the lower energy orbitals and gradually enter the higher energy orbitals. Due to the greater stability in the lower energy levels, the electron follows such a continuum in entering orbitals.
The formula for determining the energy of an orbital in Aufbau’s principle is-
E = n + l
Where n is the principal energy level number or principal quantum number of any orbital.
l is the value of the associated quantum number of the energy level. which-
• For s orbitals, l = 0
• For p orbital, l = 1
• For d orbital, l = 2
• For f orbitals, l = 3
E.g. If we determine the energy of 3s orbital-
For 3s, n = 3 and l = 0
Then the energy, E = n + l = 3 + 0 = 3
Similarly, for 4d, E = n + l = 4 + 2 = 6
We have a total of 7 main orbitals for the electron arrangement of all the elements in the periodic table. Among them-
• For the Kth energy level, n = 1; which has orbital – 1s
• For the Lth energy level, n = 2; which has orbitals – 2s 2p
• For the Mth energy level, n = 3; which has orbitals – 3s 3p 3d
• For the Nth energy level, n = 4; which has orbitals – 4s 4p 4d 4f
• For the Oth energy level, n = 5; which has orbitals – 5s 5p 5d 5f
• For P the energy level, n = 6 ; which has orbitals – 6s 6p 6d 6f
• For the Qth energy level, n = 7; which have orbitals – 7s 7p 7d 7f
If we arrange them in order of strength, the order we get is-
1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s < 4f < 5d < 6p < 7s < 5f < 6d < 7p
However, if two energy levels are equal in energy value, then the energy level in which the value of n is lower, the electron will enter first.
• For example-
• Energy for 4s, E = 4
• Energy for 3p, E = 4
The energy of these two orbitals is equal. So which one will the electron enter first? At 3p! Because 4s and 3p have equal strength. Since the n value of the 3p orbital is low (n = 3), the electron will enter the 3p orbital first.
Even if we arrange the electrons according to the order of energy, we have to keep one more thing in mind.
• When an orbital is filled with electrons, it is the most stable.
• When an orbital is half-filled with electrons, it is fairly stable.
• If an orbital is neither filled nor unfilled with electrons, it is the least stable.
Since the inner energy levels are full, we will try to fill or half-fill the orbital in the outermost energy electron configuration.
Many may think that Aufbau is the name of a scientist or researcher. But no! Aufbau is a German word. Which means – to build or rise.
See lessWhat is Newton’s third law of force?
Newton's third law of force is: For every acting force there is an equal and opposite reaction force. Newton's third law tells us that whatever action force we apply, there will be an equal and opposite reaction force. That is, if you push a wall with 10 newtons, the wall will also push you back witRead more
Newton’s third law of force is: For every acting force there is an equal and opposite reaction force.
Newton’s third law tells us that whatever action force we apply, there will be an equal and opposite reaction force. That is, if you push a wall with 10 newtons, the wall will also push you back with 10 newtons.
See lessWhat is Newton’s second law of force?
Newton's second law of force is: The rate of change of momentum of an object is proportional to the applied force. In the direction where the force acts, the change in momentum also occurs. From here we understand - the more force is applied to the object, the more its momentum changes.
Newton’s second law of force is: The rate of change of momentum of an object is proportional to the applied force. In the direction where the force acts, the change in momentum also occurs.
From here we understand – the more force is applied to the object, the more its momentum changes.
See less