A point charge accelerating under the influence of an external force emits electromagnetic radiation that reduces the increase in its mechanical energy. This causes a reduction in the particle's acceleration. We derive the decrease in acceleration due to radiation reaction for a particle accelerating parallel to its velocity, and show that it has a negligible effect.

The meaning of Lorentz contraction in special relativity and its connection with Bell’s spaceships parable is discussed. The motion of Bell’s spaceships is then compared with the accelerated motion of a rigid body. We have tried to write this in a simple form that could be used to correct students’ misconceptions due to conflicting earlier treatments.

We study the acceleration and collisions of rigid bodies in special relativity. After a brief historical review, we give a physical definition of the term ‘rigid body’ in relativistic straight line motion. We show that the definition of ‘rigid body’ in relativity differs from the usual classical definition, so there is no difficulty in dealing with rigid bodies in relativistic motion. We then describe The motion of a rigid body undergoing constant acceleration to a given velocity.The acceleration of a rigid (...) body due to an applied impulse.Collisions between rigid bodies. (shrink)

The debate over whether Frankfurt-style cases are counterexamples to the principle of alternative possibilities has taken an interesting turn in recent years. Frankfurt originally envisaged his attack as an attempting to show that PAP is false—that the ability to do otherwise is not necessary for moral responsibility. To many this attack has failed. But Frankfurtians have not conceded defeat. Neo-Frankfurtians, as I will call them, argue that the upshot of Frankfurt-style cases is not that PAP is false, but that it (...) is explanatorily irrelevant. Derk Pereboom and David Hunt’s buffer cases are tailor made to establish this conclusion. In this paper I come to the aid of PAP, showing that buffer cases provide no reason for doubting either its truth or relevance with respect to explaining an agent’s moral responsibility. (shrink)

Mathematicians often speak of conjectures as being confirmed by evidence that falls short of proof. For their own conjectures, evidence justifies further work in looking for a proof. Those conjectures of mathematics that have long resisted proof, such as Fermat's Last Theorem and the Riemann Hypothesis, have had to be considered in terms of the evidence for and against them. It is argued here that it is not adequate to describe the relation of evidence to hypothesis as `subjective', `heuristic' or (...) `pragmatic', but that there must be an element of what it is rational to believe on the evidence, that is, of non-deductive logic. (shrink)

Conditional analyses of ability have been nearly entirely abandoned by philosophers of action as woefully inadequate attempts of analyzing the concept of ability. Recently, however, Vihvelin (2004) and Fara (2008) have appealed to the similarity between dispositions and abilities, as well as recent advances in the metaphysics of dispositions, in order to construct putatively superior conditional analyses of ability. Vihvelin and Fara claim that their revised conditional analyses of ability enable them to show that Frankfurt-style cases fail to sever the (...) connection between freedom and responsibility, and that compatibilism about free will and determinism is true. I argue, however, that even granting the truth of their dispositional analyses, they cannot achieve these aims. Vihvelin and Fara’s fundamental error lies in their failing to appreciate the complex nature of free will and moral responsibility—specifically that agents’ freedom and responsibility depend not only on their abilities, but also their opportunities. (shrink)

It is useful on the occasion of the 21st anniversary of the ‘Cyborg Manifesto’ not only to reconsider its lessons in the context of what is frequently described as the re-engineering of ‘life itself’, but to look at Haraway’s earlier work on embryos. In this article I begin with Haraway’s analysis of embryology in the 1970s to suggest her cyborg embryo was already there, and has, if anything, gained relevance in today’s embryo-strewn society. I argue further, as the title suggests, (...) that the cyborg embryo has been crucial in defining our path to what I am calling here, building on Haraway’s notion of trans from Modest_Witness, ‘transbiology’ - broadly meaning stem cell research, cloning, tissue engineering and regenerative medicine. To illustrate this argument I draw on recent ethnographic fieldwork in a new stem cell derivation facility in the UK built adjacent to an IVF surgery. Using this example, I explore the important and paradoxical role of IVF in the emergence of stem cell science, cloning and transbiology, suggesting that Haraway’s analysis remains crucial to understanding the ironic and contradictory, and unexpectedly generative, circumstances through which the IVF-stem cell interface - the door to transbiology - came into being. (shrink)

Libertarianism has, seemingly, always been in disrepute among philosophers. While throughout history philosophers have offered different reasons for their dissatisfaction with libertarianism, one worry is recurring: namely a worry about luck. To many, it seems that if our choices and actions are undetermined, then we cannot control them in a way that allows for freedom and responsibility. My fundamental aim in this paper is to place libertarians on a more promising track for formulating a defensible libertarian theory. I begin by (...) arguing that Robert Kane's influential formulation of libertarianism actually generates an acute worry about luck, showing specifically that Kane's recipe for solving the problem of luck and his attendant conception of the location and role of indeterminism derived from it are deeply problematic. I then offer a reformulation of libertarianism ? particularly a new conception of the location and role of indeterminism ? that is capable of avoiding the problems that beset Kane's theory and that, I argue, places libertarians on a more promising track for formulating a defensible theory. (shrink)

We give several characterizations of Schnorr trivial sets, including a new lowness notion for Schnorr triviality based on truth-table reducibility. These characterizations allow us to see not only that some natural classes of sets, including maximal sets, are composed entirely of Schnorr trivials, but also that the Schnorr trivial sets form an ideal in the truth-table degrees but not the weak truth-table degrees. This answers a question of Downey, Griffiths and LaForte.

In this article I suggest a tripartite classification of scientific activity; discovery, pursuit, and justification. I believe that such a classification can give us a more adequate description of scientific practice, help illuminate the various roles that evidence plays in science, and may also help to partially resolve differences between “constructivist” and “epistemologist” views of science. I argue that although factors suggested by the constructivists such as career goals, professional interests, utility for future practice, and agreement with existing commitments do (...) enter into pursuit, it is experimental evidence that is decisive in justification. I illustrate this with two case studies from the history of contemporary science, experiments on atomic parity violation and their relation to the Weinberg-Salam unified theory of electroweak interactions and the fifth force in gravity. I also answer some of the criticisms offered of my earlier account of the episode of atomic parity violation. (shrink)

Defends the cosmological argument for the existence of God against Hume's criticisms. Hume objects that since a cause is before its effect, an eternal succession has no cause; but that would rule of by fiat the possibility of God's creating the world from eternity. Hume argues that once a cause is given for each of a collection of objects, there is not need to posit a cause of the whole collection; but that is to assume the universe to be a (...) heap of things arbitrarily grouped rather than a whole arbitrarily divided. (shrink)

Debriefing is a standard ethical requirement for human research involving the use of deception. Little systematic attention, however, has been devoted to explaining the ethical significance of debriefing and the specific ethical functions that it serves. In this article, we develop an account of debriefing as a tool of moral accountability for the prima facie wrong of deception. Specifically, we contend that debriefing should include a responsibility to promote transparency by explaining the deception and its rationale, to provide an apology (...) to subjects for infringing the principle of respect for persons, and to offer subjects an opportunity to withdraw their data. We also present recommendations concerning the discussion of deception in scientific articles reporting the results of research using deception. (shrink)

This paper provides an overview of results from an Australian Research Council-funded project "Sentiments and Risks: The Changing Nature of Human-Animal Relations in Australia." The data discussed come from a survey of 2000 representative Australians at the capital city, state, and rural regional level. It provides both a snapshot of the state of involvement of Australians with nonhuman animals and their views on critical issues: ethics, rights, animals as food, risk from animals, native versus introduced animals, hunting, fishing, and companionate (...) relations with animals. Its data point to key trends and change. The changing position of animals in Australian society is critical to understand, given its historic export markets in meat and livestock, emerging tourism industry with its strong wildlife focus, native animals' place in discourses of nation, and the centrality of animal foods in the national diet. New anxieties about risk from animal-sourced foods and the endangerment of native animals from development and introduced species, together with tensions between animals' rights and the privileging of native species, contribute to the growth of a strongly contested animal politics in Australia. © 2007 Brill Academic Publishers. (shrink)

We study the connection between Schnorr triviality and genericity. We show that while no 2-generic is Turing equivalent to a Schnorr trivial and no 1-generic is tt-equivalent to a Schnorr trivial, there is a 1-generic that is Turing equivalent to a Schnorr trivial. However, every such 1-generic must be high. As a corollary, we prove that not all K-trivials are Schnorr trivial. We also use these techniques to extend a previous result and show that the bases of cones of Schnorr (...) trivial Turing degrees are precisely those whose jumps are at least 0". (shrink)

In this commentary on D. Nails, “Two Dogmas of Platonism,” I focus on her arguments for the claim that the Good is not the unhypothetical principle of everything in Plato’s Republic. I first examine what it would mean for any principle to be an unhypothetical principle of everything, and argue that Nails equivocates in her construal of this role. I then argue that Plato’s references to the unhypothetical principle should not be read to refer to a single, unique item, but (...) to each Form F in its role as the cause of a F phenomena. (shrink)

The late twentieth century saw two long-term trends in popular thinking about ethics. One was an increase in relativist opinions, with the “generation of the Sixties” spearheading a general libertarianism, an insistence on toleration of diverse moral views (for “Who is to say what is right? – it’s only your opinion.”) The other trend was an increasing insistence on rights – the gross violations of rights in the killing fields of the mid-century prompted immense efforts in defence of the “inalienable” (...) rights of the victims of dictators, of oppressed peoples, of refugees. The obvious incompatibility of those ethical stances, one anti-objectivist, the other objectivist in the extreme, proved no obstacle to their both being held passionately, often by the same people. (shrink)

Argues that information, in the animal behaviour or evolutionary context, is correlation/covariation. The alternation of red and green traffic lights is information because it is (quite strictly) correlated with the times when it is safe to drive through the intersection; thus driving in accordance with the lights is adaptive (causative of survival). Daylength is usefully, though less strictly, correlated with the optimal time to breed. Information in the sense of covariance implies what is adaptive; if an animal can infer what (...) the information implies, it increases its chances of survival. (shrink)

We investigate the relationship between lowness for Schnorr randomness and Schnorr triviality. We show that a real is low for Schnorr randomness if and only if it is Schnorr trivial and hyperimmune free.

In this paper I will reexamine the history of the early experiments on atomic parity violation, presenting both Pickering's interpretation and an alternative explanation of my own. I argue that, contrary to Pickering, there were good reasons for the decision of the physics community. I will also explore some of the differences between my view of science and that proposed by the "strong programme" or social constructivist view in the sociology of science.

In the target article, Baars has offered both a theory of consciousness and a strategy for scientifically testing the theory. This commentary is intended as an addendum. I'd like to suggest implementing global workspace agents as both an additional strategy toward scientific testing, and as a means of fleshing out the theory.

Argues for a minimal level of quantification for the "proof beyond reasonable doubt" standard of criminal law: if a jury asks "Is 60% enough?", the answer should be "No.".

The large Eastern European migration program to Australia in the late 1940s was driven not only by Australia's need for migrants, but by Catholic views on the rights of refugees and an international Cold War plan to resettle the million people who had fled the Red Army.

My dissertation develops a novel theory of free will and moral responsibility, Strawsonian libertarianism, which combines Strawsonianism about the concept of moral responsibility with event-causal libertarianism concerning its conditions of application. I construct this theory in light of and response to the three main objections to libertarianism: the moral shallowness objection, the intelligibility objection, and the empirical plausibility objection.The moral shallowness objection contends that libertarianism seems plausible only in the absence of a robust understanding of the nature of moral responsibility. (...) P.F. Strawson's work is the fount of this objection. In response I argue, surprisingly, that Strawson's account of the nature of responsibility, according to which the essence of responsibility is defined in terms of the reactive attitudes (such as gratitude and resentment), actually leads to libertarianism about its conditions of application. In defense of this contention I offer a theory of the normative force of excuse which shows that moral responsibility requires that agents have free will. I then construct the No Opportunity Argument which demonstrates that free will, and thus moral responsibility, is incompatible with determinism.In the remainder of the dissertation I develop and defend this account of moral responsibility against the intelligibility and empirical objections, both of which focus on my contention that indeterminism is necessary for freedom and responsibility. The intelligibility objection contends that libertarians cannot provide an intelligible account of freedom and responsibility because indeterminism is either (at best) irrelevant or (at worst) inimical to control. I respond to these objections by showing that if we locate indeterminism at the moment of free choice, libertarianism can explain both why indeterminism does not diminish control and also how it is relevant to enhancing it.Finally, I turn to the empirical plausibility objection which contends that libertarianism is scientifically implausible. This objection centers on my contention that humans must be indeterministic systems in order to be free and responsible. I argue that my commitment to neuronal indeterminism fares well in light of current physical and neurobiological findings and, therefore, that Strawsonian libertarianism is not as scientifically demanding as many have thought. (shrink)

The views of some historians and philosophers of history as to the possibility of fruitful historical generalization seem at odds with the underlying methodology of the other social sciences. A formal model of the world historical process is here presented within which this apparent contradiction is seen to be resolvable in terms of modern theories of probability and stochastic processes. This is done by giving rigorous form to procedures and statements in the social sciences. A formal treatment of the dependence (...) of an investigation in one discipline on previous studies both in that area and in other social and natural sciences then follows naturally. (shrink)

In Marshall's Tendencies (Sutton, 2000), John Sutton poses some fairly deep questions for economists, especially for empirical work. In particular, when (if ever) is it safe to behave as though the applies? In that paradigm, we are attempting to extract and estimate the model from the data and are only kept from doing so because, while economic analysis captures the main , there are many small influences that we cannot exactly take into account. That paradigm, which Sutton traces to an (...) analogy of Marshall's likening economic predictions to predictions of the tides, leads to the econometric estimation of economic relationships, taking statistical account of the unincluded small influences by placing them in a random disturbance term. Sutton states (p. 5),. (shrink)

Cooper has claimed to have found evidence for faster-than-light particles by reanalyzing the data of Chamberlain et al. in their paper reporting the discovery of the antiproton. A careful reanalysis of this same data gives no evidence to support Cooper's claim.

One important point that has emerged from recent work on the history and philosophy of experiment is that technology plays an integral role in experiment, and therefore in science. Technology determines what experimenters can measure and how well it can be measured. The importance of technology, along with several new questions that its use raises, has been made quite clear in the papers presented in this session.

We describe a comprehensive framework for text un- derstanding, based on the representation of context. It is designed..