Good school physics

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  • In Section 1.5 of the textbook, Zak introduces the Lagrangian L = K − U , which is the difference between the kinetic and potential energy of the system. He then proceeds to obtain the Lagrange equations of motion in Cartesian coordinates for a point mass subject to conservative forces, namely, d dt ∂L ∂ xi ˙ − ∂L = 0 i = 1, 2, 3. ∂xi (1)

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  • An implicit assumption made by the traditional direct marketing paradigm is that profit can only be generated by a direct promotion. In other words, it has been assumed that a customer would not make the purchase unless being contacted by the campaign. As such, how one would behave without the direct promotion is of no concern. However, we have to wonder if such an assumption holds in real life. It is not unrealistic to believe that some customers will make the purchase on their own without receiving the contact. ...

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  • In recent years, although slowly, steps have been taken towards a greater liberalisation of the agricultural markets. However, agriculture still accounts for 66% of the protectionism in the trade for goods and services today. This explains, at least in part, its small impact on international trade, since it only represents 4% of the gross world product (World Bank, 2006). For EU member countries, agricultural protectionism derives from the CAP (Common Agricultural Policy).

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  • Many of the traditionally sound cultural practices recommended for conventional agriculture are also employed in organic production. In fact, organic agriculture has been referred to as “good farming practice without using synthetic chemicals.”2 For example, planned crop rotations, which have multiple benefits in terms of soil building, plant health, pest management, and enhancing biodiversity, are required in annual organic cropping systems.

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  • Healthy, active living benefits individuals and society in many ways. Positive associations have been found between increased levels of physical activity, good nutrition and physical fitness, and healthy body weight, psychological wellbeing, musculoskeletal health, cognition and readiness to learn. A healthy, active population enhances productivity, pro-social behaviours and personal satisfaction and has the potential to reduce the burden of chronic disease.

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  • The advantage of the Hall-Liebman data set for our purposes is that, since we are concerned with the connection between executive risk taking and risk-taking incentives, it is necessary for us to have a very good estimate of the precise portfolio of executive stock option holdings, including details about the number, exercise price and maturities of all options held.

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  • Lisa Lieberman, M.S.W., L.C.S.W., is a psychotherapist with Parkinson’s Resources of Oregon. When it comes to communicating with children about Parkinson’s — or any disease — she believes that knowledge is power. “Lack of knowledge creates more anxiety,” she says. “Kids are intuitive. They know what’s going on. If they aren’t given a way to make sense of it, it just makes it worse for them.” Even the most difficult news, once out in the open, relieves the anxiety that uncertainty creates.

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  • I. Choose the correct form of the verb, singular or plural. Sometimes either a singular or a plural verb is possible. Example: Gymnastics is / are my favorite sport.  Gymnastics is my favorite sport. 1. The trousers you bought for me doesn’t / don’t fit me. 2. Physics was / were my best subject at school. 3. Fortunately the news wasn’t / weren’t as bad as we had expected. 4. The police wants / want to interview Fred about a robbery. 5. Three days isn’t / aren’t long enough for a good holiday. 6. Where does / do your family live? 7. England have / has lost all their...

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  • Children’s social and emotional wellbeing is important in its own right but also because it affects their physical health (both as a child and as an adult) and can determine how well they do at school. Good social, emotional and psychological health helps protect children against emotional and behavioural problems, violence and crime, teenage pregnancy and the misuse of drugs and alcohol (‘Systematic review of the effectiveness of interventions to promote mental wellbeing in children in primary education’ Adi et al. 2007). ...

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