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Hdm . 5 years ago
Yogita Ingle 5 years ago
Gravitation is the attractive force existing between any two objects that have mass. The force of gravitation pulls objects together. Gravity is the gravitational force that occurs between the earth and other bodies. Gravity is the force acting to pull objects toward the earth.
Posted by Akib Khan 5 years ago
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Pragati Agrawal 5 years ago
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Solid: Matters which have fixed volume and shape are called solids. For example - stone, wood, brick, ice, sugar, salt, coal, etc. All metals are solid except mercury and gallium.
Properties of solids
- Solid has fixed volume.
- Solid has fixed shape.
- Solid has high density.
- Solids are heavy.
- Solid does not flow.
Posted by Akash Patil 5 years ago
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Yogita Ingle 5 years ago
- Thomson’s model revealed that atom has spherical structure, with positive charge spread all over the sphere and electrons are embedded in it. Also there is equal number of positive and negative charge i.e. atom is electrically neutral.
- Ernest Rutherford carried out experiments by taking consideration in Thomson’s model and presented more accurate model i.e. Rutherford’s model. Rutherford bombarded ⍺ particles i.e. He2+ ions on gold foil. Gold foil has very thin thickness of about 1000 atoms thick. Observations of Rutherford’s experiment are
- Most of ⍺ particles passes through gold foil
- Some ⍺ particles get deflected with very small angles from their path
- Very few i.e. 1/ 12000 were reflected back on same path
Posted by Palak Pandey 5 years ago
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Yogita Ingle 5 years ago
Friction is the force that resists motion when the surface of one object comes in contact with the surface of another. It is also defined as the resistance offered by the surfaces that are in contact with each other when they move over each other.
We see friction in our day to day activities. Following are the ten examples of friction in daily life:
- Walking –It is impossible to walk on the ground without friction. Friction is what holds your shoe to the ground. The friction present on the ice is very little, this is the reason why it is hard to walk on the slippery surface of the ice.
- Writing – A frictional force is created when the tip of the pen comes in contact with the surface of the paper. Rolling friction is what comes into play while writing with a ballpoint pen while sliding friction arises when one writes with a pencil.
- Skating – A thin film of water under the blade is necessary to make the skate slide. The heat generated by the skate blade rubbing against the surface of ice causes some of the ice to melt right below the blade where the skater glides over the ice. This water acts as a lubricant reducing friction.
- Lighting a matchstick – When the head of the matchstick is rubbed against a rough surface, heat is generated and this heat converts red phosphorous to white phosphorous. White phosphorous is highly inflammable and the match stick ignites. Sometimes, matchsticks fail to ignite due to the presence of water. Water lowers friction.
Posted by Sakshi Kumari 5 years ago
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Yogita Ingle 5 years ago
Mixtures which have uniform composition throughout are called Homogeneous Mixture. For example – mixture of salt and water, mixture of sugar and water, air, lemonade, soda water, etc.
Mixture of salt in water is an example of homogeneous mixture. In this mixture, the boundary of salt and water cannot be differentiated. When a ray of light is passed through the mixture of salt and water, the path of light is not seen.
Posted by Sundri Devi Sundri Devi 5 years ago
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Yogita Ingle 5 years ago
Particles of air have large spaces between them. On the other hand, wood has little space between its particles. Also, it is rigid. For this reason, we can easily move our hands in air, but to do the same through a solid block of wood, we need a karate expert.
Posted by Navya Navya 5 years ago
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Yogita Ingle 5 years ago
1) Skeletal muscles: It is a form of striated muscle tissue, which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibres known as tendons.
2) Smooth muscle: Smooth muscle generally forms the supporting tissue of blood vessels and hollow internal organs, such as the stomach, intestine, and bladder.
3) Cardiac muscle: The cardiac muscle function has a movement of contraction, which moves the blood into the heart and the circulatory system that goes throughout the body. The cardiac muscle function is important because it keeps the blood flowing within the heart so that it can continue to pump.
Posted by Harsh Pratap Singh Singh 5 years ago
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Usman Sharif X-A 5 years ago
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A plasma is a hot ionized gas consisting of approximately equal numbers of positively charged ions and negatively charged electrons.
Specifically, plasma is ionized gas. That is gas that has been given an electrical charge by being stripped of electrons. Such ionized gas is the most abundant observable form of matter in the universe, being the main ingredient in stars and nebulas.
Manish Rawat 5 years ago
Posted by Sarita Panda 5 years ago
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Yogita Ingle 5 years ago
To calculate the value of g, we should put the values of G, M and R in Eq. (9), namely, universal gravitational constant,
G = 6.7 × 10–11 N m2 kg-2, mass of the earth,
M = 6 × 1024 kg, and radius of the earth,
R = 6.4 × 106 m.
g=G M/R2
6.7 10-11 N m2 kg-2 6 1024 kg / (6.4 106 m)2 = 9.8 m s–2.
Thus, the value of acceleration due to gravity of the earth, g = 9.8 m s–2.
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Posted by Pari Kansal 5 years ago
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Yogita Ingle 5 years ago
let the no. of litres of water be x
Therefore the solution=75+x
15% (75+x)=75
75+x=75*100/15
x=500-75
x=425 litres.
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Yerrabolu Chakradhar 5 years ago
1Thank You