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1 dzień temu · A simple gravity pendulum [1] is an idealized mathematical model of a real pendulum. [2] [3] [4] It is a weight (or bob) on the end of a massless cord suspended from a pivot, without friction.Since in the model there is no frictional energy loss, when given an initial displacement it swings back and forth with a constant amplitude.The model is based on the assumptions:
1 dzień temu · Newton's laws of motion are three physical laws that describe the relationship between the motion of an object and the forces acting on it. These laws, which provide the basis for Newtonian mechanics, can be paraphrased as follows: . A body remains at rest, or in motion at a constant speed in a straight line, except insofar as it is acted upon by a force.
1 dzień temu · The cosmic microwave background (CMB or CMBR) is microwave radiation that fills all space in the observable universe.It is sometimes called relic radiation.With a standard optical telescope, the background space between stars and galaxies is almost completely dark.However, a sufficiently sensitive radio telescope detects a faint background glow that is almost uniform and is not associated with ...
1 dzień temu · Archimedes of Syracuse [a] (/ ˌ ɑːr k ɪ ˈ m iː d iː z / AR-kim-EE-deez; [2] c. 287 – c. 212 BC) was an Ancient Greek mathematician, physicist, engineer, astronomer, and inventor from the ancient city of Syracuse in Sicily. [3] Although few details of his life are known, he is regarded as one of the leading scientists in classical antiquity.Considered the greatest mathematician of ...
1 dzień temu · In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales. Its primary effect is to drive the accelerating expansion of the universe.Assuming that the lambda-CDM model of cosmology is correct, [1] dark energy is the dominant component of the universe, contributing 68% of the total energy in the present-day observable universe ...
1 dzień temu · The prevailing model of atomic structure before Rutherford's experiments was devised by J. J. Thomson. [1]: 123 Thomson had discovered the electron through his work on cathode rays [2] and between 1897 and 1904 he developed a model for atoms containing electrons arranged in concentric shells.To explain why atoms are electrically neutral, he proposed the existence of a commensurate amount of ...
1 dzień temu · Time dilation is the difference in elapsed time as measured by two clocks, either because of a relative velocity between them (special relativity), or a difference in gravitational potential between their locations (general relativity).When unspecified, "time dilation" usually refers to the effect due to velocity. After compensating for varying signal delays resulting from the changing ...
