How does the electromagnetic spectrum work? Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays. The human eye can only detect only a small portion of this spectrum called visible light. A radio detects a different portion of the spectrum, and an x-ray machine […]
How do plants and animals respond to changing seasons?
How do plants and animals respond to changing seasons? Sometimes animal adaptations are triggered by weather and seasonal changes. Some plants become dormant and some animals undergo changes to prepare for the winter. Some animals collect food to store during the winter months and others hibernate, migrate, or grow thicker fur. What can cause the […]
What are characteristics of a physical change?
What are characteristics of a physical change? A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density. What is the difference between physical and chemical process? There is […]
Can electric fields cause cancer?
Can electric fields cause cancer? Although there is no known mechanism by which non-ionizing EMFs could damage DNA and cause cancer, even a small increase in risk would be of clinical importance given how widespread exposure to these fields is. Do humans have sixth sense? You’ve probably been taught that humans have five senses: taste, […]
What time do birds go to bed?
Is magnitude positive or negative?
Is magnitude positive or negative? Answer: Magnitude cannot be negative. It is the length of the vector which does not have a direction (positive or negative). In the formula, the values inside the summation are squared, which makes them positive. What does the magnitude of a number mean? The size of something. The magnitude of […]
What are some examples of power exercises?
What are some examples of power exercises? Examples of strength exercises you can adapt into power exercises (by making the concentric contraction — the part where you raise the weight against gravity — fast and powerful, but preserve the slow, steady pace on the eccentric contraction eg when lowering the weight back to the starting […]
What is the study of rocks and soil?
What is the study of rocks and soil? Geology is the study of the nonliving things that the Earth is made of. Geology is the study of rocks in the Earth’s crust. People who study geology are called geologists. Some geologists study minerals and the useful substances the rocks contain such as ores and fossil […]
Why are nuclear power plants bad?
Why are nuclear power plants bad? Nuclear energy produces radioactive waste A major environmental concern related to nuclear power is the creation of radioactive wastes such as uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes. These materials can remain radioactive and dangerous to human health for thousands of years. Are all nuclear […]
Why is bronze not a chemical reaction?
Why is bronze not a chemical reaction? Creation of an alloy is not a chemical process as all that is happening is that heat is being applied to the metals to liquify them, then mixng them together. Does bronze last forever? So how long do they last? Ethan Darby of Trigard Memorials states “in the […]