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"Force and energy."
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Push and pull
\"Describes the forces of push and pull using everyday objects such as strollers and wagons. Includes experiments\"-- Provided by publisher.
Book
Ending the Fossil Fuel Era
Not so long ago, people North and South had little reason to believe that wealth from oil, gas, and coal brought anything but great prosperity. But the presumption of net benefits from fossil fuels is eroding as widening circles of people rich and poor experience the downside.A positive transition to a post-fossil fuel era cannot wait for global agreement, a swap-in of renewables, a miracle technology, a carbon market, or lifestyle change. This book shows that it is now possible to take the first step toward the post-fossil fuel era, by resisting the slow violence of extreme extraction and combustion, exiting the industry, and imagining a good life after fossil fuels. It shows how an environmental politics of transition might occur, arguing for going to the source rather than managing byproducts, for delegitimizing fossil fuels rather than accommodating them, for engaging a politics of deliberately choosing a post-fossil fuel world. Six case studies reveal how individuals, groups, communities, and an entire country have taken first steps out of the fossil fuel era, with experiments that range from leaving oil under the Amazon to ending mountaintop removal in Appalachia.
eBook
The science of forces
A look at the science behind force, friction, and the laws of motion and energy.
Book
Energy
\"In this book, readers will learn how energy affects the movement of objects through the air, the warmth we feel on our skin when the sun shines, and many concepts in between\"--Provided by publisher.
Book
Transit cosmological models in Formula omitted gravity theory
In the present paper, we investigate some exact cosmological models in [Formula omitted] gravity theory. We have considered the arbitrary function [Formula omitted] where [Formula omitted] is an arbitrary constant, [Formula omitted] are respectively, the Ricci-scalar curvature and the torsion. We have solved the field equations in a flat FLRW spacetime manifold for Hubble parameter and using the MCMC analysis, we have estimated the best fit values of model parameters with [Formula omitted] regions, for two observational datasets like H(z) and Pantheon SNe Ia datasets. Using these best fit values of model parameters, we have done the result analysis and discussion of the model. We have found a transit phase decelerating-accelerating universe model with transition redshifts [Formula omitted]. The effective dark energy equation of state varies as [Formula omitted] and the present age of the universe is found as [Formula omitted] Gyrs, respectively for two datasets.
Journal Article
Experiments with forces
Read and Experiment is an engaging series that uses fun experiments to introduce children to analytical thinking, scientific concepts and experimental procedures. Through fun, carefully designed experiments, it encourages children to get hands-on with science, asking questions and seeking their own answers by following the illustrated step-by-step instructions. The title gets them familiar with the science of forces.
Book
The hybrid cosmology in the scalar-tensor representation of Formula omitted gravity
In this work, the [Formula omitted] theory of gravity is recast in terms of the [Formula omitted] and [Formula omitted] fields within the scalar-tensor formulation, where [Formula omitted] is the Gauss-Bonnet term and T denotes the trace of the energy-momentum tensor. The general aspects of the introduced reformulation are discussed and the reconstruction of the cosmological scenarios is presented, focusing on the so-called hybrid evolution. As a result, the scalar-tensor [Formula omitted] theory is successfully reconstructed for the early and late time approximations with the corresponding potentials. The procedure of recovering the [Formula omitted] theory in the original formulation is performed for the late time evolution and a specific quadratic potential. The scalar-tensor formulation introduced herein not only facilitates the description of various cosmic phases but also serves as a viable alternative portrayal of the [Formula omitted] gravity which can be viewed as an extension of the well-established scalar Einstein-Gauss-Bonnet gravity.
Journal Article
Experiments with forces
Genuine scientists test their theories through experiments, using the results to uncover truly amazing discoveries. In this beneficial STEM-based book, readers are the scientists diving into experiments about forces such as gravity, friction, and magnetism. Theyll use easy-to-find materials such as balloons, erasers, and rulers to perform step-by-step experiments, learning more about forces at work in the world all around them. A summary of each carefully illustrated experiment reviews what the result conveys about the concept, while extra activities encourage more experimentation, an attribute of every great scientist.
Book
TiO.sub.2-Based Double-Shelled Homojunction Hollow Spheres Decorated with Spatially Separated Cocatalyst for Enhanced Photocatalytic Hydrogen Evolution
Efficient separation of photogenerated carriers and surface reactions is the crucial factor in achieving successful photocatalytic water splitting. Herein, a novel Pt@Co-T@T@M hollow sphere was prepared by a template-assisted method. Pt was anchored on the inner surface of Co-doped TiO.sub.2 shell, serving as electron collectors and active sites for reduction reaction, while MnO.sub.X was immobilized on the outer surface of TiO.sub.2 shell for oxidation reaction. Under simulated one-sun (AM 1.5G) illumination, the as-prepared Pt@Co-T@T@M hollow spheres exhibited a remarkable hydrogen evolution rate of 7.304 mmol g.sup.-1 h.sup.-1, which is 114 times higher than that of T@T hollow spheres. The exceptional photocatalytic water-splitting performance is attributed to the synergistic effect between homojunction and spatial dual-cocatalyst, which promotes enhanced spatial separation of photogenerated carriers and reduces recombination. This study highlights the importance of precise and rational control over photocatalyst structure for achieving highly efficient water splitting.
Journal Article