Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Teena S 3 years, 11 months ago
- 3 answers
Aarti Yadav 3 years, 11 months ago
Posted by Sehaj Pannu 3 years, 11 months ago
- 1 answers
Gaurav Seth 3 years, 11 months ago
Work |
|
| Definition | Work is said to be done when a force applied to an object moves that object. |
| Formula | We can calculate work by multiplying the force by the movement of the object.
W = F × d |
| Unit | The SI unit of work is the joule (J) |
Energy |
|
| Definition | In physics, we can define energy as the capacity to do work. |
| Formula | For the potential energy the formula is
P.E. = mgh |
| Unit | The SI unit of energy is joules (J), which is named in honour of James Prescott Joule. |
Power |
|
| Definition | Power can be defined as the rate at which work is done i.e. energy converted. |
| Formula | The formula for power is
P = W/t |
| Unit | The unit of power is watt (W). |
Posted by Anshika Rahangdale 3 years, 11 months ago
- 3 answers
Yogita Ingle 3 years, 11 months ago
The water droplets which appear on the wall of the glass jar when a potted plant is covered with it are because of the process, which is called transpiration. The water droplets form because of the condensed water vapour which deposits on the wall of the jar. These vapours are lost through the process of transpiration.
Transpiration is the process by which the evaporation of water takes place from the leaves of the plant and is released into the atmosphere. This evaporation takes place from the small pores, which are present on the underside of the leaf and are called stomata.
Posted by Madhura Rodge 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
Lysosomes are single membrane bound cellular organelles. They possess many hydrolytic enzymes that destroy any foreign material inside the cell such as bacteria. It also digests poorly working cell organelles. So, they are also known as suicide bags. In these processes, they remove the cell debris. As lysosomes remove unnecessary particles and organelles from cell hence they are called as scavengers of the cells.
Posted by Manish Pataliya 3 years, 11 months ago
- 3 answers
Ruchi Singh 3 years, 11 months ago
Posted by Pratibha Kushwah 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
The example of diffusion of gases in liquids is: Oxygen (gas) gets dissolved in blood (liquid) during the process of respiration.
Posted by Pratibha Kushwah 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
Water at room temperature does not have a fixed shape but flows to take the shape of the container. Hence, water at room temperature is a liquid.
An iron almirah is a solid at room temperature because its melting point as well as boiling point is above room temperature.
Posted by Pratibha Kushwah 3 years, 11 months ago
- 5 answers
Yogita Ingle 3 years, 11 months ago
Gases have neither fixed shape nor fixed volume. This is because of the weak intermolecular foces of attraction in the gases. They take the shape and volume of the container in which they are placed.
Abhishek Kumar 3 years, 11 months ago
Posted by Punit Kadyan 3 years, 11 months ago
- 1 answers
Posted by Srushti Khadtare 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
If α-particle scattering experiment is carried out using a foil of any metal as thin as gold foil used by Rutherford, there would be no change in observations if heavy metal like gold use for example Platinium, sliver. but if it would be taken by light metal like lithium than the massive alpha particles will push the nucleus and may not be deflected back.
Posted by Mishika Pandey 3 years, 11 months ago
- 3 answers
Neelesh Verma 3 years, 11 months ago
Taniya Chauhan 3 years, 11 months ago
Posted by Kavita Mani Tripathi 3 years, 11 months ago
- 3 answers
Neelesh Verma 3 years, 11 months ago
Ananya K 3 years, 11 months ago
Gaurav Seth 3 years, 11 months ago
Derivation of Newton’s third law of motion from Newton’s second law of motion
Consider an isolated system of two bodies A & B mutually interacting with each other, provided there is no external force acting on the system.
Let FAB, be the force exerted on body B by body A and FBA be the force exerted by body B on A.
Suppose that due to these forces FAB and FBA, dp1/dt and dp2/dt be the rate of the change of momentum of these bodies respectively.
Then, FBA = dp1/dt ---------- (i)
=> FAB = dp2/dt---------- (ii)
Adding equations (i) and (ii), we get,
FBA + FAB = dp1/dt + dp2/dt
⇒ FBA + FAB = d(p1 + p2)/dt
If no external force acts on the system, then
d(p1 + p2)/dt = 0
⇒ FBA + FAB = 0
⇒ FBA = - FAB---------- (iii)
the above equation (iii) represents the Newton's third law of motion (i.e., for every action there is equal and opposite reaction).
Posted by Sakshi Kamble 3 years, 11 months ago
- 1 answers
Ananya K 3 years, 11 months ago
Posted by Muskan Student 3 years, 11 months ago
- 3 answers
Gaurav Seth 3 years, 11 months ago
Answer:
Helium has two electrons in its energy shell, while argon and neon have 8 electrons in their valence shells. As these have maximum number of electrons in their valence shells, they do not have any tendency to combine with other elements. Hence, they have a valency equal to zero.
Meghna Thapar 3 years, 11 months ago
Valency is defined as the measure of the combining power with other atoms when it forms a molecule of compound. ... Noble gases have valency 0 because these elements cannot loose or gain electrons. The electrons are fully filled in the sub-shells of these elements. hence, the valency of these elements is 0. Helium has two electrons in its only energy shell. ... As the elements have the maximum number of electrons in their valence shells (thereby achieving stable duplet and octet configurations), they do not have any tendency to combine with other elements. Hence, Helium, Neon, and Argon have zero valency.
Posted by Gulshan Kumar 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
- A coil with many circular close turns of insulated copper wire (like a cylinder as shown above) is a solenoid.
- One end of such a solenoid behaves like the north pole and the other as a south pole.
Posted by Akshita ???? 3 years, 11 months ago
- 2 answers
Taniya Chauhan 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
Consider a body having large mass and large weight. Example of this situation is a large object which is hard to throw because the weight of this object is large.
Therefore, the relation between weight and mass can be derived with the help of Newton’s second law which explains that the free falling object has an acceleration “g” as the magnitude.
If an object with a mass of 1kg falls with an acceleration of 9.8 m.s-2, then the magnitude of the force is given as :
F = ma
= (1kg)(9.8m.s-2)
= (9.8 kg.m.s-2)
= 9.8N
Therefore, it can be concluded that the relation between weight and mass of an object with 1kg mass will have a weight of 9.8N.
Posted by Om Chavhan 3 years, 11 months ago
- 2 answers
Aarushi Erande 3 years, 11 months ago
Pratibha Kushwah 3 years, 11 months ago
Posted by Swayam Deep 3 years, 11 months ago
- 2 answers
Ankit Kumar 3 years, 11 months ago
Manyata Joshi 3 years, 11 months ago
Posted by Santhosh Kumar 3 years, 11 months ago
- 4 answers
Nandani Singh 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
AAS stands for Angle-angle-side. When two angles and a non-included side of a triangle are equal to the corresponding angles and sides of another triangle, then the triangles are said to be congruent.
Students sometime may get confused AAS with ASA congruency. But remember that AAS is for non-included side whereas ASA is for included sides of the triangles.
If there are two triangles say ABC and DEF, then as per AAS rule:
∠B = ∠E
∠C = ∠F
AB = DE
Hence,
Δ ABC ≅ Δ DEF
Posted by Rashika Maithil 3 years, 11 months ago
- 3 answers
Ankit Kumar 3 years, 11 months ago
Santhosh Kumar 3 years, 11 months ago
Posted by Swayam Deep 3 years, 11 months ago
- 1 answers
Gaurav Seth 3 years, 11 months ago
If the plasma membrane ruptures or breakdown then the cell will not be able to exchange material from its surrounding by diffusion or osmosis. Thereafter the protoplasmic material will be disappeared and the cell will die.
Posted by Supriya Pal 3 years, 11 months ago
- 4 answers
Sania Khan 3 years, 11 months ago
C Abbi 3 years, 11 months ago
Supriya Pal 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
Newton’s 1st law states that a body at rest or uniform motion will continue to be at rest or uniform motion until and unless a net external force acts on it.
Newton’s 2nd law states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
F = ma
The Newton’s 3rd law states that for every action there is an equal and opposite reaction.
Posted by Khushbu Pandit 3 years, 11 months ago
- 2 answers
Yogita Ingle 3 years, 11 months ago
Osmosis can be defined as the movement of water molecules from a higher water concentration area to the area of less water concentration through a semipermeable membrane. In other words, it can be defined as the diffusion of water molecules through a semipermeable membrane. It is a special case of diffusion of water (High to low). For example, water in the roots of plants is transported through osmosis.
Diffusion is the net movement of molecules of a substance from a region of their higher concentration to a region of their lower concentration. Net movement means there are more molecules moving in one direction than in the opposite direction.
Example: Opening a bottle of perfume in a room will result in the gradual diffusion of the perfume from the region of higher concentration (the bottle) out into the room. Diffusion will continue until the perfume has a more or less uniform concentration throughout the bottle and room.
Posted by Khushbu Pandit 3 years, 11 months ago
- 2 answers
Rashika Maithil 3 years, 11 months ago
Rahul Dayanand 3 years, 11 months ago
Posted by Anurag Sonkar 3 years, 11 months ago
- 1 answers
Manyata Joshi 3 years, 11 months ago
Posted by Harsh Rajput 3 years, 11 months ago
- 0 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Kalpesh Kabra 3 years, 11 months ago
2Thank You