The simulation shows a ballistics cart. If the cart is at rest on a horizontal surface, it will shoot a ball straight up in the air, and catch the ball again. What if, as in this simulation, the cart is traveling at a constant velocity horizontally, instead? Will the ball land ahead of the cart, in the cart, or behind the cart? Note that the cart fires the ball straight up, with respect to the cart, when the middle of the cart passes the small vertical trigger on the track.
Use the buttons to select the different modes (whether there is a tunnel or not, and whether to show the velocity vectors).

Cryptocurrencies like Bitcoin rely on blockchain technology and crypto mining, which consume massive amounts of electricity and have significant carbon footprints. The lack of transparency and regulation in the industry raises concerns about the economic, social, and environmental costs associated with crypto mines.

Increased energy use per capita is linked to decreased poverty rates. Modest energy increases can lead to significant poverty reduction, but the relationship is not always linear. Factors like governance and social policies also influence poverty levels. Beyond a certain threshold, further energy increases have diminishing returns.

President Biden authorized the release of 180 million barrels of crude oil from the Strategic Petroleum Reserve to lower gasoline prices amid the Russia-Ukraine War. While previous releases had modest effects, the magnitude of this release is significant. Estimates suggest a reduction of $0.15 to $0.38 per gallon at the pump.

Methane emissions from coal mines are a significant concern for greenhouse gas reduction. Certain mines, known as "superemitters," contribute a large proportion of global methane emissions. Factors like mine depth and coal rank affect methane content. While reducing coal use in electricity generation is important, mitigating methane emissions from mines needs greater attention.

This simulation shows the difference between Constant Velocity vs. Constant Acceleration هذه المحاكاة تبين الفرق بين السرعه الثابته والتسارع المستمر في الفيزياء

The simulation shows five different motions in which objects experience constant acceleration, starting from rest. Although each motion is different, the underlying physics is the same. What features of the simulation reinforce the idea that the physics is the same?

Energy access plays a vital role in reducing undernourishment and improving food security. It boosts agricultural productivity, enhances food quality, reduces losses, and enables transportation. However, addressing factors like political instability and poor policies is crucial alongside increasing energy use.

Energy use influences life expectancy. Access to energy services improves well-being and extends lifespan, while deprivation has the opposite effect. Modest energy increases positively impact longevity, especially in low-energy regions. However, beyond a certain point, additional energy use has diminishing returns for life expectancy.

The Human Development Index (HDI) measures overall well-being beyond economic growth, focusing on health, education, and income. Countries with low development levels use less energy, and small energy increases lead to significant HDI improvements. Energy efficiency improvements can be made without compromising quality of life, addressing environmental concerns and promoting equity.

hile higher incomes generally lead to greater life satisfaction, it's not a guarantee. People in countries with high life satisfaction tend to use more energy, which can enhance comfort and mobility. Modest increases in energy use can significantly improve life satisfaction, but there are diminishing returns at higher levels.

While moving up the income ladder is generally accompanied by increased energy use, there are significant variations within income groups. Factors such as the economy's structure, geography, climate, lifestyle, public policy, and consumer attitudes also influence how effectively energy use translates into income.

Population growth does impact energy use, but per capita energy consumption varies greatly across countries due to factors like geography, climate, economic structure, policies, and cultural preferences. Countries with small populations can have high energy consumption, while countries with large populations may use less energy.

This web page features a collection of Easy Java Simulations developed by secondary teachers for use in introductory high school physics courses. Topics include astronomy, momentum and collision, projectile motion, Gauss's Law and electric field, special relativity, and more. Each simulation is accompanied by a standards-based lesson plan and printable student guides. Users may run the simulations as a Java applet or may directly download a jar file version. The materials in this collection were created with Easy Java Simulations (EJS), a modeling tool that allows users without formal programming experience to generate computer models and simulations. To modify or customize the model, See Related Materials for detailed instructions on installing and running the EJS Modeling and Authoring Tool. This resource is part of Project ITOP (Improving the Teaching of Physics), a graduate program offered at University of Massachusetts-Boston. The archived computer models are hosted and maintained as part of the BU Physics Simulation collection.

The simulation illustrates the situation of a person in an elevator. The elevator takes the person from one floor to the next floor up.
For this situation, try sketching three free-body diagrams, one for the person, another for the elevator, and a third for the person-elevator system.
First, draw the diagrams for when the system remains at rest. Then, predict whether the free-body diagrams will change (and, if so, how) when the elevator is accelerating up, moving up at constant velocity, and moving up but slowing down (acceleration is down).

The simulation draws the diagrams for all these cases, but make sure you try drawing your own before looking at the simulation's diagrams.

Major reports and initiatives by the city and its collaborators are described here in chronological order, starting in 2007. Use the drop down menu to filter the reports by subject area.

n 2021, the United States saw the addition of 851 new electric generating and storage units with at least 1 MW capacity, totaling 37,769 MW of new capacity. Wind and solar accounted for 79% of this new capacity, followed by natural gas (11%) and storage (9%).

Explore the global history of nuclear reactors from 1951 to 2022. This visualization showcases 626 operational reactors, highlighting the dominance of pressurized light water reactors (PWRs). Different reactor types exhibit geographic patterns, with retired reactors and ongoing upgrades observed in various countries. The average age of reactors in the United States was 41 years in 2021.

The use of biomass by humans can be traced back at least 1 million years to the controlled use of fire. However, the generation of electricity from biomass, known as biopower, is a more recent development. One of the earliest biopower plants was the São José da Estiva power station in Brazil, which began operating in 1900.

In 2020, 437 new solar electricity projects worldwide added a total capacity of 38,941 MW. The largest project was the 1348 MW Karapınar YEKA-1 solar farm in Turkey. Asia, North America, and Europe were the main contributors to solar capacity, with China leading with 23% of the global additions.