CBSE > Class 09 > Science | CBSE Board | Homework Help

When the lift starts it accelerates downward and afterwards it moves with a constant velocity. Let the acceleration is a. So the man feels weight loss. Once the lift achieves constant velocity the acceleration is zero hence he don't experience any weight loss.

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. (a) Identify the kind of motion in the following cases: (i) A car moving with constant speed turning around a curve. (ii) An electron orbitting around nucleus. (b) An artificial satellite is moving in a circular orbit of radius 36,000 km. Calculate its speed if it Help me ?

Posted by Sanket Kumar ? 3 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Can you ask some questions regarding to motion chapter , if you like

Posted by Anshika Sharma 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Anshika Sharma 3 years, 2 months ago

No problem ☺️,but it's not related to motion chapter

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Piyush ? 3 years, 2 months ago

Ok thanku Anshika

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Anshika Sharma 3 years, 2 months ago

Atom is the smallest unit of an element which contain atleast one proton and one neutron

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Anshika Sharma 3 years, 2 months ago

Is it related to motion chapter ?

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Piyush ? 3 years, 2 months ago

Define Atoms?

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ANSWER

Define crop rotation. While choosing plants for crop rotation, what factors should be kept in mind? 3 Marks

Posted by Yug Jain 3 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Do all cells in plants show cell division?

Posted by Dhruva Patel 3 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Dhruva Patel 3 years, 2 months ago

How do it show?

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Anshika Sharma 3 years, 2 months ago

Ya off course

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ANSWER

The establishment of the Delhi Sultanate in the beginning of the 13th century facilitated the beginning of a new phase of cultural development in India. The interaction of the Turks with the Indians, who had definite religious beliefs and well-established ideas on art, architecture and literature, led to the development of a new composite culture. This culture is known as the Indo–Islamic culture. It is said to be a fusion of the best elements of both Persian (Muslim influence) and Indian (predominantly Hindu influence) cultures. All about indo Islamic culture is here if you need more anshika plz msg me

Posted by Riyanshi ... 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Riyanshi ... 3 years, 2 months ago

And you

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Riyanshi ... 3 years, 2 months ago

Rajasthan

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Anshika Sharma 3 years, 2 months ago

Or itni help ke liye thanks , by the way from which state you belong

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ANSWER

Why is oxygen called a gas? Give reasons

Posted by Prachi Chaudhary 3 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Sia ? 3 years, 2 months ago

Oxygen remains in gaseous state at normal temperature and pressure. As the property of gases having no shape and volume, oxygen do not have a fixed shape or volume. Oxygen flows from areas of higher to lower concentrations. Hence for these reasons oxygen remains as gas.

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Prachi Chaudhary 3 years, 2 months ago

Please answer me now of this question What is dry Ice? How is it prepared?

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Prachi Chaudhary 3 years, 2 months ago

What is dry Ice? How is it prepared?

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ANSWER

Define first law of motion?

Posted by Piyush ? 3 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Sia ? 3 years, 2 months ago

Newton’s first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. This postulate is known as the law of inertia. The law of inertia was first formulated by Galileo Galilei for horizontal motion on Earth and was later generalized by René Descartes. Before Galileo it had been thought that all horizontal motion required a direct cause, but Galileo deduced from his experiments that a body in motion would remain in motion unless a force (such as friction) caused it to come to rest.

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Anshika Sharma 3 years, 2 months ago

Koi nhi ??, good night ?

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Piyush ? 3 years, 2 months ago

Ok thanku Anshika

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Anshika Sharma 3 years, 2 months ago

It is also known as law of inertia, an object remaining in State of rest or of uniform motion in a straight line unless and until an external unbalanced force is applied on it.

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Calculate the concentration of a solution containing 2.5g of salt dissolved in 50g of water?

Posted by Manasvi Sharma 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 2 months ago

given the mass of solute (salt) = 2.5 g

and mass of solvent (water) = 50g

as we know that mass of solution = mass of solute + mass of solvent
= 2.5 + 50
= 52.5g

concentration of the solution = (mass of solute/mass of solution) × 100
= (2.5/52.5) × 100
= 250/52.5
= 4.76% (approximately)

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What would it mean by saying a 15% of alcohol solution?

Posted by Manasvi Sharma 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 2 months ago

15% alcohol solution means that there is 15 mL of alcohol present in the 100 mL of alcohol solution.

In every 100 mL of alcohol solution there is 15% of alcohol present in it:

Alcohol present in 100 mL alcohol solution = 15 mL

Water present in in 100 mL alcohol solution = 100 - 15 = 85 mL

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ANSWER

Convert the following temperature to the Celsius scale (a)293 K (b)470 K

Posted by Shubham Kalsariya 3 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Riyanshi ... 3 years, 2 months ago

To change temperature from kalium to Celsius we need to -273 from the particular given temperature in kalium 293K =293-273=20 degree Celsius 470K =470-273=197 degree Celsius

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Sanket .........✨ 3 years, 2 months ago

a) 20°C , (b) 197° C

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ANSWER

J.J Thomson proposed that the nucleus of an atom contains only nucleons .

Posted by Sanket .........✨ 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Anshika Sharma 3 years, 2 months ago

Hye

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Piyush ? 3 years, 2 months ago

False

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Sanket .........✨ 3 years, 2 months ago

True or false bta do ??

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ANSWER

How many of you are fans of interstellar??

Posted by Mishty Panchal 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sanket .........✨ 3 years, 2 months ago

Mishty Interstellar kya hai

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ANSWER

Describe the continuous motion of particles of matter with the help of an activity

Posted by Divyanshu Rajpoot 3 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 2 months ago

To demonstrate motion of particles in air:

Place few lighted incense sticks in a corner of a room.
Move about the room and smell the fragrance of the incense sticks.
The fragrance produced due to burning of incense sticks is due to movement of vapours produced rapidly in all directions.

To demonstrate motion of particles of solid matter:

Drop a crystal of copper sulphate or potassium permanganate into a glass of hot water.
Do not stir the solution and allow the crystals to settle at the bottom.
The colour of the solid is seen spreading slowly. This is because the solid particles diffuse in the water.

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ANSWER

Free fall under gravity vah hota Hai jiski andar chij hamesha niche ki taraf aati Hai iske andar chahe kisi bhi chij ko upar ki taraf fekho chai niche fenko ,chijen freefall hokar niche ki taraf bhi aati Hai jismein Sabse pahle free fall of under gravity ke bare mein batya vo the Galileo, unhone ye bataya tha ki jo chiz ko ham jidhar bhi pheke chaye downward ya upward chix ami bapass nichee hi hai , ek example ki baat Karen ki agar mein kisi bhi object ko upar ki taraf pekhu, to usmein ki velocity to hogi upward Lekin in acceleration downvids downward jiske vajye se speed decrease ho jayegi or aur agar kisi chij Ko niche ki taraf pheke tu velocity downward and acceleration is also so in in downward direction, jiski ki vajah se a speed increase ho jayegi , unhone ye bhi batya tha ki acceleration ki value 9.8 m/sec² hogi, yrr vo thoda late isliye ho gaya kiu ki maine do baar answer likhe but pata nhi kiu send nhi ho rha tha , or typing my late ho gyi

Posted by Anshika Sharma 3 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Anshika Sharma 3 years, 2 months ago

Its ok

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Riyanshi ... 3 years, 2 months ago

Thank you soo much

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ANSWER

cricket ball of mass 70 g moving with a velocity of 0.5 metre per second is stopped by the player in 0.57. what is the force applied by the player to stop the Ball❓

Posted by Anshika Sharma 3 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Anshika Sharma 3 years, 2 months ago

Noh

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Abhinav Sharma 3 years, 2 months ago

0.35 N

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Anshika Sharma 3 years, 3 months ago

I want the solutions

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Riyanshi ... 3 years, 3 months ago

-.07 N is the answer

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ANSWER

A girl of mass 5o kg jumps out of a moving boat of mass 300 kg on the bank with the horizontal velocity of 3 metre per second did what metal velocity will the boat being to move backwards❓

Posted by Anshika Sharma 3 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Riyanshi ... 3 years, 2 months ago

Let's say the force exerted by the girl is F1 and the force exerted by the boat is F2. And the movement of the girl be M1 and movement of the boat be M2.. Now movement of the girl in one direction = movement of boat in opposite direction.....M1=M2 M1 * V1(velocity)=M2 *V2 M1 is given 50....V1 is given 3m/s²....and M2 is given 300 to us.. So, 50 * 3=300*V2 V2=.5m/s²

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Anshika Sharma 3 years, 3 months ago

Solution plz

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Riyanshi ... 3 years, 3 months ago

Velocity of the boat for moving backwards would be point .05m/s²

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ANSWER

The displacement of a body can never be greater than the distance covered by a body. Is the statement true or false ?

Posted by Kumkum Joshi 3 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Paushali Mitra 3 years, 2 months ago

Answer is true

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Riyanshi ... 3 years, 3 months ago

True

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ANSWER

What is balanced and unbalanced force?

Posted by Piyush ? 3 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Piyush ? 3 years, 2 months ago

Thanku sanket kumar

1Thank You

Sanket .........✨ 3 years, 3 months ago

forces that are equal in size and opposite in direction. Balanced forces do not result in any change in motion. unbalanced. forces: forces applied to an object in opposite directions that are not equal in size. Unbalanced forces result in a change in motion.

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ANSWER

Can paints be an example of colloid ?

Posted by Nano Fibres 3 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 3 months ago

Dried paint is typically considered to be a colloid, as the dispersed particles are indefinitely spread throughout the binder (dispersing medium). When paints are manufactured, the pigments are very finely ground, often with the binder, to create a particle size that is colloidal.

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ANSWER

List any two application of centrifugation

Posted by Hriday Sharma 3 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 3 months ago

Application of centrifugation are: Used in diagnostic laboratories for blood and urine test. Used in dairies and home to separate butter from cream. Used in a washing machines to squeeze out water from wet clothes.

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ANSWER

What is the c.g.s. unit of force

Posted by Anshika Sharma 3 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Sanket .........✨ 3 years, 3 months ago

The cgs unit for force comes from the same equation and is called the dyne, or dyn. 1 dyn = 1 g·cm/s2.

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ANSWER

What tissues connect the muscles to the bones? help me bhailog ??

Posted by Sanket .........✨ 3 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Riyanshi ... 3 years, 3 months ago

Answer is skeletal tissues

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Anshika Sharma 3 years, 3 months ago

Bhai log se hi puchoge, ?TENDON IS THE ANSWER

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ANSWER

What is the largest known animal? ??

Posted by Sanket .........✨ 3 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Sanket .........✨ 3 years, 3 months ago

Yes Anshika

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Anshika Sharma 3 years, 3 months ago

Blue whale

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Sanket .........✨ 3 years, 3 months ago

What 100°C OMG ?

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Niranjana Renjith 3 years, 3 months ago

100°C

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ANSWER

What’s the boiling point of water?

Posted by Sanket .........✨ 3 years, 3 months ago

CBSE > Class 09 > Science

5 answers

Mausham Kumari 3 years, 3 months ago

100 degree celsius

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Harshvivek Lakhera 3 years, 3 months ago

100°c

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Anshika Sharma 3 years, 3 months ago

100 degree Celsius

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Sanket .........✨ 3 years, 3 months ago

Yes bro you are right

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Niranjana Renjith 3 years, 3 months ago

100°C

2Thank You

ANSWER

What is the hottest planet in the solar system? ?

Posted by Sanket .........✨ 3 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Riyanshi ... 3 years, 3 months ago

Venus

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Mausham Kumari 3 years, 3 months ago

Venus

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Anshika Sharma 3 years, 3 months ago

Venus

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A satellite while revolving around the Earth ? complete one revolution in 1 hour and 30 minutes . What is the angular speed of satellite ❓

Posted by Anshika Sharma 3 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Anshika Sharma 3 years, 3 months ago

Ohhh

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Sanket .........✨ 3 years, 3 months ago

Anshika mera 2 account bhi suspend ho gya ????? ye third hai agar ye bhi suspend ho gya to aap logo se 30 din baad baat kr sakta ho ???????????

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ANSWER

Why gaurd cells gaurd stomata

Posted by Molly Jhamb 3 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Sanket .........✨ 3 years, 3 months ago

Guard cells are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata. ... The phototropins trigger many responses such as phototropism, chloroplast movement and leaf expansion as well as stomatal opening.

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About indo islamic culture ? The types and forms of large buildings required by Muslim elites, with mosques and tombs much the most common, were very different from those previously built in India. The exteriors of both were very often topped by large domes, and made extensive use of arches. Both of these features were hardly used in Hindu temple architecture and other indigenous Indian styles. Both types of building essentially consist of a single large space under a high dome, and completely avoid the figurative sculpture so important to Hindu temple architecture.[3] Islamic buildings initially adapted the skills of a workforce trained in earlier Indian traditions to their own designs. Unlike most of the Islamic world, where brick tended to predominate, India had highly skilled builders well used to producing stone masonry of extremely high quality.[4] Alongside the architecture developed in Delhi and prominent centres of Mughal culture such as Agra, Lahore and Allahabad, a variety of regional styles developed in regional kingdoms like the Bengal, Gujarat, Deccan, Jaunpur and Kashmir Sultanates. By the Mughal period, generally agreed to represent the peak of the style, aspects of Islamic style began to influence architecture made for Hindus, with even temples using scalloped arches, and later domes. This was especially the case in palace architecture. Following the collapse of the Mughal Empire, regional nawabs such as in Lucknow, Hyderabad and Mysore continued to commission and patronize the construction of Mughal-style architecture in the princely states. Indo-Islamic architecture has left a large impact on modern Indian, Pakistani and Bangladeshi architecture, as in the case of its influence on the Indo-Saracenic Revivalism of the late British Raj. Both secular and religious buildings are influenced by Indo-Islamic architecture.

Posted by Saɴᴋᴇᴛ ???? 3 years, 3 months ago

CBSE > Class 09 > Science