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In this topic important questions of gravitation is given which will be very important for students studying in class 11th .

 This topic covers all important questions of gravitation

Important question
Gravitation
*****Derivation /define/relations based questions
goalma.org Newtons law of gravitation in vector form .(I)Haw can you find the mass of earth ,starting from the law of gravitation?)II) What are the factors affecting the value of G ? (III) If mass of two bodies are doubled and distance is halved , how will the gravitational force change ?
2. Define gravitational acceleration , find the expression for it, also find its value on the surface of earth .Haw the value of g changes (I) With altitude (II)with the depth .A planet reduces its radius by 1% with its mass remaining same , haw acceleration due to gravity changes ?
3. Define gravitational field and gravitational field intensity at a point , also find the expression for field intensity at a point.
4. Define gravitational potential, and gravitational potential energy at a point ,derive the expression for gravitational potential at a point also find the relation with potential energy.
5. Write the differences between                                                                                         (I) Inertial and gravitational mass,                                                                                 (II) G and g                                                                                                                           (III)escape velocity and orbital velocity on earth.
goalma.org is escape velocity ? obtain the expression for the escape velocity on earth . why there is no atmosphere on moon? Explain.
goalma.org and prove Kepler’s laws of planetary motion.
8. what is geostationary satellite ? calculate the height of the orbit above the surface of the earth in which a satellite is placed , will appear stationary, and also write the conditions for the launching of geo stationary satellite.
goalma.org the term orbital velocity , find the expression for (a) orbital velocity(b) time period and(c) total energy of the satellite . obtain the relation for orbital speed and escape velocity of the satellite from earth surface.
***numericals***
A 10 kg mass is divided into two parts , such that the force of attraction between them is maximum , what is the mass of each portions?
two stationary particles of masses M and m are separated by distance d apart . a third particle of mass m1 is placed on the line joining the two particles , experience no resultant gravitational force , what is the distance of the particle from m ?
haw far above the earth’s surface does the value of g becomes 20% of its value on the surface of earth ?
find the relation between height h above the earth surface with the depth from the earth surface where the value of g will be same.
what is the percentage increase in velocity for moon to escape from the gravitational pull of the earth ?
Two masses each of mass kg are separated by distance 1m , find the gravitational (a) field and (b) potential at the mid point of the line joining them.
A satellite of mass kg is raised from a circular orbit of radius 2R to a circular orbit of radius 3R . what is the approximate work done ?
  If the earth supposed to be a uniform sphere , suddenly contract and its radius becomes half of its original value , what will be the duration of day (or what will be time of rotation of earth on its own axis/ what will be the %change in duration of day)?
The weight of a body on the surface of earth is N . calculate its weight at the distance equal to half of radius of earth below the surface of earth ( radius of earth = km)
A rocket is launched from the surface of earth vertically with an initial speed of 10 m/s . haw far above the surface of earth would it go ? radius of the earth is km.
A satellite of mass kg is rotating in an orbit at a height of km from the surface of earth , haw much energy must be given to the rocket to take the satellite out of the earth ‘s gravitational influence? Mass of earth= x 10^24 kg; radius of earth= km.
Three particles each of mass m are placed at the vertices of an equilateral triangle of side l . Find the work which should be done on this system to increase the sides of triangle 2l.
At what rate should the earth rotate so that the apparent g on the equator becomes zero? What will be the length of day in this situation? Find the energy required to launch a satellite of mass kg from the surface of earth to the height km above the earth surface.
Find the potential energy of a system of four particles placed at the vertices of a square of side l . also obtain the gravitational potential and gravitational field intensity at the center of the square.
Why space craft usually launched from west to east ? why is it more advantageous to launch rockets in the equatorial plane?

To solve important questions of system particles and rotational motion click here-

Let’s face it; facial wipes are super convenient – but do you know what’s really in them? In recent years, traditional face wipes have gotten some heat for being overly drying, irritating and damaging, especially for sensitive, dry, and acne-prone skin types. Alarmingly, the back of a standard pack of makeup wipes can read like a bar cart, boasting drying alcohols, irritants and parabens a-plenty. Vigorously rubbing these ingredients into your face after a long day to remove dirt and grime can lead to a host of issues, not the least of which are premature wrinkles, breakouts, flaky skin and allergic reactions (granted, regular cleansers and improper cleansing techniques can also cause these same issues).

So in light of all this, we’ve made it our duty to assist you with your quest to finding the perfect set of makeup wipes to soothe and cleanse your skin safely and effectively, minus the nasties and harmful side effects.

Blacklist these Ingredients

First things first, get acquainted with which ingredients to avoid. When reading the back of your makeup wipes, avoid nasties such as:

• Propylene Glycol, which is an irritant, but allergic contact dermatitis is also widely documented with this ingredient.
• Phenoxyethanol, classified by the EU as an irritant, restricted for use in Japan and a data sheet listing harmful if swallowed, inhaled or absorbed through the skin. Can cause reproductive damage and effects on brain and nervous system.
• Decylamine Oxide, a harsh cleaning agent usually for dishwashing detergents!
• Synthetic Fragrances (also marked as parfum), which easily irritate the skin and are known endocrine disruptors.
• Formaldehyde-releasing chemicals, which are in some preservatives, such as 2-BromoNitropropane-1, 3-Dio. This has the highest hazard rating on the EWG’s Skin Deep ingredient database.
• Methylisothiazolinone (also called MI), another preservative, which has caused some severe allergic reactions in the form of hand, face and neck dermatitis, and has also earned a “High Hazard” rating from EWG.

What happens to the wipe once it&#;s been used?

Flushed away to wash up on a beach? Or thrown into the bin to live in a landfill for the next hundred or so years? The danger with some single-use makeup wipes is that they’re using a mix of polyesters, plastics and viscose to create a strong, smooth feeling towelette that once disposed of, cannot break down. A report by the Marine Conservation Society has shown that the number of wet wipes washed up on British beaches has increased by 50% since Scary!

ECOCARE uses soft % Certified Organic Cotton. This is naturally grown, sustainable and biodegradable. As it comes from the earth it is the safest wipe material to go back into the earth!

Some handy alternatives

Many wipes can be harsh, greasy, or just plain ineffective not to mention abrasive on the skin, rendering the time and energy saved at the sink totally worthless.

Our wipes will never leave the skin feeling greasy or dry, but rather refreshed and rejuvenated. No residue. Better yet, they won’t make the eyes sting when removing eye makeup – bonus!

These packs are also handy to take to the gym to unblock perspiration-clogging pores and freshen up the easy and handy way. Double bonus. They are free from parabens and all the nasties, but are still effective at dissolving and removing makeup. We use as mild natural preservative system as possible, that still manages to discourage bacteria growth that can so easily occur when moistened items are stacked together in an enclosed package. Our products pass a strict process to comply with the Soil Association Organic Certification giving you confidence in safety for the skin and environment.

The two varieties of wipes available here boast naturally derived ingredients that work to cleanse and condition the skin, to leave the complexion glowing and gunk-free.

So now that you’re aware of what goes into a bad wipe, here’s what goes into a good wipe (and we promise we’re not biased!).

Refreshing Apple & Honey

Delicious smelling skincare routine, right this way! Organic apple juice in each pack, to cleanse the skin of oily build-up and leave your skin feeling conditioned and firm. The organic honey adds moisture and introduces natural antioxidants to the skin, assisting with hydration and rejuvenation. This flavour is best for oily and combination skin, as the apple is so great at combatting unwanted oil.

Soothing Rose & Chamomile

These wipes use three variations of organic rose oil including the prized Rosa Damascena, essential for toning and balancing skin. In addition to the rose, organic Chamomile will moisturise and soothe sensitive and tired skin, and is best suited for mature and dry skin types, as the rose oil works to hydrate skin.

The right way to use Makeup Wipes

We get that the makeup removing process can be pretty arduous, but it’s an absolutely necessary step in order to keep your skin at its cleanest and clearest. Thankfully, the whole routine is pretty simple.

Ultimately, you should use gentle pressure when it comes to wiping away the day’s face in small circular motions. You should especially avoid dragging the thin skin around your eyes backwards and forwards, as this can contribute to premature ageing. ECOCARE wipes are made with % Organic Cotton that’s as gentle on the environment as it is the delicate skin around the peepers.

Using some wipes alone without the follow-up step of rinsing with water could expose your skin to higher concentrations of the bad which may lead to further irritation or dryness. It depends on what works best for your skin. But with ECOCARE, the formulas are so natural and gentle, that an easy wipe and go is often all it takes to remain blemish-free and radiant – minus the rinse off with water or cleanser. If you do wish to cleanse post-wipe, though, we recommend opting for formulas as natural, organic and eco-friendly as possible. Look for an organic Certification on the packaging.

Giving Back

Good news: 10 cents from every ECOCARE product sold goes directly to The ECOCARE Foundation Incorporated, so every time you purchase an ECOCARE product, just know that you are supporting a good cause.

Through this charity, ECOCARE provides support and aid to environmental and people focussed charities and projects, aiming to improve the health of our environments, communities and populations. One of our more recent projects, Team Nadine, works to provide fresh water systems to regional Cambodia, helping improve the lives of thousands of people. So far over 30 wells have been installed and countless tonnes of rice have been distributed.

Keeping it Local

ECOCARE wipes are Made in Britain, meaning better working conditions for staff and an ethical supply chain. None of the ingredients or the final product have been tested on animals, and are completely Cruelty Free compliant with the Leaping Bunny certification program.

The packaging is also more environmentally friendly than any other wet-wipe packaging in the world. The Cardia Biohybrid packaging uses renewable content – meaning less plastic and less oil, which in turn equates to less environmental impact and better sustainability.

So if you you’re looking for a compromise between convenience and your skin’s safety, check out ECOCARE. Being smart about the formula you’re using and how you’re using it will not only boost your relationship with your facial wipes and maximise your skincare routine, but give you better peace of mind, and you really can’t go wrong with that.

Lot #38 Watson Place

Watson View East

**$,**

Gorgeous ' heated floor plan!!

3 spacious bedrooms all downstairs

2 full baths

completed bonus room upstairs

covered porch off dining room

gas fireplace in great room

double garage

snack bar in kitchen

formal dining room

huge walk in closet in master 

**LEWISBURG SCHOOLS**

MLS #

Contact Wanda Lambert

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[email protected]

*pictures are for illustration only, plans subject to change*