Is friction force always present? Friction always acts to oppose any relative motion between surfaces. For the simple example of a book resting on a flat table, the frictional force is zero. There is no force trying to move the book across the table, so there is no need for a frictional force because there […]
How much physical activity do adults need?
How much physical activity do adults need? 1. Adults aged 18–64 should do at least 150 minutes of moderate-intensity aerobic physical activity throughout the week or do at least 75 minutes of vigorous-intensity aerobic physical activity throughout the week or an equivalent combination of moderate – and vigorous-intensity activity. How can regular participation in physical […]
How do we usually think of voltage as the cause and current as the effect?
How do we usually think of voltage as the cause and current as the effect? Voltage is the Cause, Current is the Effect Voltage attempts to make a current flow, and current will flow if the circuit is complete. Voltage is sometimes described as the ‘push’ or ‘force’ of the electricity, it isn’t really a […]
What happen when air heats up?
What happen when air heats up? What happens when air is heated or cooled? So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward. This is the concept used […]
Who is the longest girl in the world?
Who is the longest girl in the world? While she is not the world’s tallest woman, her legs are 132 centimeters long….Svetlana Pankratova. Svetlana Pankratova Светлана Панкратова Education Virginia Commonwealth University Known for Previous record-holder for the longest legs of any woman in the world How long is the longest kiss in the world? 58 […]
Should you always remember when handling microscope slides?
What are the 2 laws of chemical combination?
What are the 2 laws of chemical combination? There are five basic laws of chemical combination that govern the chemical combinations of elements: Law of Conservation of Mass. In simple terms, this law states that matter can neither be created nor destroyed. Law of Definite Proportions. Law of Multiple Proportions. Gay Lussac’s Law of Gaseous […]
Can Sea breezes occur at night?
Can Sea breezes occur at night? The opposite of a sea breeze is a land breeze. While sea breezes occur during the day, land breezes occur at night. Do valley breezes occur at night? When the valley floor warms during the day, warm air rises up the slopes of surrounding mountains and hills to create […]
What are three differences between work and power?
What are three differences between work and power? The SI unit of work is Joule. Power is defined as the amount of energy transferred in unit time….Difference between Momentum and Inertia. Work Power Work can also be measured in units like electron volt (eV), kWh, MWh, and GWh. Energy is also measured in units like […]
What is an example of hyperextension?
What is an example of hyperextension? Hyperextension and instability of the shoulder can occur when the shoulder joint is over-rotated due to repetitive motions. These motions are common in certain sports, such as swimming, baseball, and javelin throwing. What are the 2 types of body movements? Flexion and Extension. Flexion and extension are movements that […]