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Yogita Ingle 5 years, 7 months ago
Newton's second law of motion gives the relationship between the force and acceleration. The second law of motion states that
the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force
The rate of change of momentum of an object is proportional to the applied force. So, Newton's second law of motion can be expressed as
force α change in momentum/time taken
Posted by Kumar Adarsh 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Newton's third law of motion states that
Whenever a body exerts a force on another body, the second body exerts an equal and opposite force on the first body
So according to third law of motion to every action there is an equal and opposite reaction. This tells us that all forces in nature acts in pairs. These two forces are always equal in magnitude but opposite in direction.
Posted by Pratik Jalane 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
The size of the particles which make up matter are very, very small. This can be shown by performing the given experiment:
i. Take 2-3 crystals of potassium permanganate and dissolve them in 100 mL of water.
ii. Take out approximately 10 mL of this solution and put it into 90 mL of clear water.
iii. Take out 10 mL of this solution and put it into another 90 mL of clear water.
iv. Keep diluting the solution like this 5 to 8 times.
This experiment shows that just a few crystals of potassium permanganate can colour a large volume of water (about 1000 L). So we conclude that there must be millions of tiny particles in just one crystal of potassium permanganate, which keep on dividing themselves into smaller and smaller particles.
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Meghna Thapar 5 years, 7 months ago
There are two types of cell division: mitosis and meiosis. Meiosis is the type of cell division that creates egg and sperm cells. Mitosis is a fundamental process for life. During mitosis, a cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells. Mitosis gives identical cells to each other and to the mother cell, while meiosis leads to genetic variation due to crossing over and independent assortment. Mitosis gives nuclei with the same number of chromosomes as the mother cell while meiosis gives cells with half the number.
Posted by Shreya Karmakar 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
- Particles of Matter have Space between them:
When we dissolve sugar in a glass of water, the volume of water remains the same and does not increase. This shows that there are spaces between the particles of water into which the particles of sugar fit together.
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Yogita Ingle 5 years, 7 months ago
The revolution speed of the earth is 30km.s-1.
The movement of the Earth around the Sun in a fixed path is called a revolution. The Earth revolves from west to east i.e, in the anticlockwise direction. The Earth completes one revolution around the Sun in one year or precisely in 365.242 days.
Posted by Rudra Patel 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
The tissue which is responsible for the increament of girth of the stem and root is cambium or lateral meristem.
Posted by Rudra Patel 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
The tissue which is responsible for the increament of girth of the stem and root is cambium or lateral meristem.
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Meghna Thapar 5 years, 7 months ago
Everything around us is made up of tiny pieces or particles. Our body is made up of particles. The particles which make up matter are so small that we cannot see them even with a high power microscope. The particles which make up matter are atoms or molecules. When a crystal of potassium permanganate is placed in a beaker of water, the water slowly turns purple on its own, without stirring. On dissolving, the particles of potassium permanganate get into the spaces between the particles of water.
Posted by Sushant Poddar 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
When an animal possess three germ layers, i.e. the ectoderm, mesoderm and endoderm, they are said to be triploblastic organisms.
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Yogita Ingle 5 years, 7 months ago
A series arrangement is not used for connecting domestic electrical appliances in a circuit because if one electrical appliance stops working due to some defect, then all other appliance also stop working as the whole circuit is broken.
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