Category: Physics

Why is it important to reduce energy usage? First of all, reducing energy use limits the number of carbon emissions in the environment. In turn, conserving energy produces a higher quality of life. Reduced emissions result in cleaner air quality. In addition, it helps create a healthier planet, or at least helps sustain the resources […]

Why the egg is less likely to break when dropped onto soft foam rather than onto a concrete floor? When the egg is dropped on a hard surface, dt is small thus F is large enough to break the egg. If it’s dropped on a soft surface, it still undergoes the same change in momentum, […]

What is the human cause of climate change? Humans are increasingly influencing the climate and the earth’s temperature by burning fossil fuels, cutting down forests and farming livestock. This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming. What is a natural climate change? […]

What is phase difference measured in? Phase difference: The time interval by which a wave leads by or lags by another wave is called “Phase difference” or “Phase angle”. It is defined by ‘Φ’. The phase angle is measured in “Radians / Sec” or “Degrees / Sec” and the phase of a complete cycle is […]

Should I unplug appliances when not in use? The energy costs of plugged-in appliances can really add up, and unplugging these devices could save your up to $100 to $200 a year. Another benefit of unplugging your appliances is protection from power surges. Should I unplug microwave when not in use? People typically remember to […]

What are limiting factors for humans? Limiting factors are resources or other factors in the environment that can lower the population growth rate. Limiting factors include a low food supply and lack of space. Limiting factors can lower birth rates, increase death rates, or lead to emigration. What are three limiting factors for human population? […]

What is the maximum efficiency of diesel engine? Modern passenger car diesel engines may have an effective efficiency of up to 43%, whilst engines in large diesel trucks, and buses can achieve peak efficiencies around 45%. However, average efficiency over a driving cycle is lower than peak efficiency. What is the basic diesel cycle? The […]

Which of the following is an assumption of the molecular clock? The “molecular clock” method assumes that changes in DNA accumulate at approximately constant rates over time. One explanation is that species might undergo genetic changes long before those changes are reflected in the body plan. What does the molecular clock used to determine how […]

How do you light a film? Here’s how to do it: Place your main and strongest source of light, called a key light, off to one side of the actor to create a slight shadow on the opposite side of their face. Add a second light, called a fill light, on the opposite side of […]

How do I get rid of reactive power? Inductive reactive power can be reduced by applying a capacitor bank. With an active dynamic filter, all types of reactive power can be reduced and the derating of the transformer or generator is limited. What exactly is reactive power? Reactive Power can best be described as the […]