Category: Physics

What is frame of reference and its types? There are two types of observational reference frame: inertial and non-inertial. An inertial frame of reference is defined as one in which all laws of physics take on their simplest form. In special relativity these frames are related by Lorentz transformations, which are parametrized by rapidity. What […]

Does oxygen form a positive or negative ion? Negative ions are called anions . Oxygen is in group 6. An oxygen atom has six electrons in its outer shell. The atom is more stable if it has a full outer shell….Forming negative ions. Atom name Ion name Sulfur Sulfide Which form of oxygen is the […]

When a small stone is dropped into a pond of still water what happens? When that pebble is dropped in the pond, it pushes water out of the way. The water has nowhere to go but to the side and up, creating a circular peak around the drop point. This peak falls again, under the […]

What is called stereopsis? Stereopsis (from the Greek στερεο- stereo- meaning “solid”, and ὄψις opsis, “appearance, sight”) is a term that is most often used to refer to the perception of depth and 3-dimensional structure obtained on the basis of visual information deriving from two eyes by individuals with normally developed binocular vision. Why is […]

Is negative free cash flow a bad sign? Although companies and investors usually want to see positive cash flow from all of a company’s operations, having negative cash flow from investing activities is not always bad. Can you have negative cash flow and positive profit? Cash flow is the net amount of cash and cash-equivalents […]

What are the similarities and differences between kinetic and potential energy? KE is the energy possessed by an object by virtue of it being in motion. PE is the energy possessed by an object by virtue of its position. It can be transferred from one object to another and this happens during collisions. Potential Energy, […]

Who first discovered fission? Lise Meitner Who found nuclear? Enrico Fermi What is the first nuclear power plant in the world? Obninsk Nuclear Power Plant How safe is nuclear? The evidence over six decades shows that nuclear power is a safe means of generating electricity. The risk of accidents in nuclear power plants is low […]

What causes sudden blind spots in vision? Any damage to your retina, such as a detached retina or artery occlusion, is a possible cause of sudden blindness. A detached retina can cause total loss of vision in the affected eye, or it may only result in partial vision loss, making it seem as if a […]

When should I worry about cold feet? You should also call your doctor right away if your feet feel cold but your skin doesn’t feel cold to the touch. This could be a symptom of a neurological condition. Why is my girlfriend so cold all the time? In some people, most often women, the process […]

What are the 3 levers involved in deep squat? The levers that exist in this analysis are the back, the femur, and the shank or lower leg. The levers, as they hinge around the hip and knee joints, form the diagnostic angles used to analyze and discuss the movement. What are examples of second class […]