Category: Physics

What is one unit of electricity? The basic unit of electricity is the Kilowatt hour (kWh). In simple terms, 1 kWh is the amount of energy used by a 1kW (1000 watt) electric heater for 1 hour. Another example is ten 100-watt light bulbs used for 1 hour. What size is 20 inches in cm? […]

What is metaphysics in simple terms? Metaphysics is a major branch of philosophy. It concerns existence and the nature of things that exist. The metaphysical idea that reality exists independently of one’s mind and yet can be known is called realism. The metaphysical idea that no mind-independent reality exists or can be known is idealism. […]

Why does air pressure increase after a cold front passes? If the air is moist and unstable enough, rain and thunderstorms can accompany the passage of the front. Air pressure usually falls as a cold front approaches, rising rapidly after passage as the dense cold air moves in. The dew point falls indicating the change […]

Why can a horse not pull a cart and run in empty space? Answer: (a) For pulling a cart or for running, the horse pushes the earth with its feet and reaction of the earth makes it move in the forward direction. Since in empty space there is no reaction force, therefore the horse cannot […]

What made the 5 Good Emperors good? Nerva’s reign began the Nervan-Antonine Dynasty, which included what history calls the Five Good Emperors. In order of their reign, they were Nerva, Trajan, Hadrian, Antoninus Pius, and Marcus Aurelius. First, the Five Good Emperors brought relative peace, stability, and prosperity to Rome. Who is the best emperor […]

What does the inverse square law state? Inverse Square law: The radiation Intensity is inversely proportional to the square of the distance. Notice in the diagram that as the distance doubles, the area quadruples and thus, the initial radiation amount is spread over that entire area and is therefore reduced, proportionately. What is a inverse […]

Why does the temperature of a substance not change when the phase changes? But there is no temperature change until a phase change is complete. i.e. during phase change, the energy supplied is used only to separate the molecules ; no part of it is used to increase the kinetic energy of the molecules. So […]

What makes a pendulum stop swinging? The main reason the pendulums stop is due to air friction and the friction at the point of rotation. To see a pendulum that removes one of these sources of friction, you can see a Coriolis force clock. These are pendulums that swing but instead of being on a […]

Does culture affect the way of life of a person? Our culture shapes the way we work and play, and it makes a difference in how we view ourselves and others. It affects our values—what we consider right and wrong. This is how the society we live in influences our choices. But our choices can […]

How is carbon-14 used in medicine? Carbon-14, which is radioactive, is the isotope used in radiocarbon dating and radiolabeling. medically important radioactive isotope is carbon-14, which is used in a breath test to detect the ulcer-causing bacteria Heliobacter pylori. Why is carbon 14 not used in nuclear medicine? Answer: It is all to do with […]