结果1 题目 Why is velocity a vector quantity?B A It acts on a body in a straight line. B It has direction and size. C It has direction but no size. D. It is a change of speed. 相关知识点: 试题来源: 解析 B 反馈 收藏
Why is a magnetic field a vector quantity? Why are the impulses that colliding objects exert on each other equal and opposite? What is spin in particle physics? Why does relativity of simultaneity occur? What is the minimum angular momentum of an electron in the hydrogen atom?
When the ratio of harvestable biomass to the total biomass (harvest index, HI) of a plant is considered, the yield of a crop can then be formalized as follows: (Eqn B2 3) Eqns B2 2, B2 3 have been extensively used to analyse the different components of year-to-year yield variation...
Velocity is a vector quantity. In physics it is displacement divided by time. If I take one step forward and one step backward my velocity is ZERO, i.e. no displacement. The number of miles driven does not equal displacement. If I leave home and drive 100,000 miles around in a circle...
The only meaningful definition for a time tag (with respect to later use of the information) requires that the time tag match the actual time of occurrence of an event, or the actual time that a power system quantity was equal to its reported value, within stated uncertainty limits. In pra...
Leibniz was of course taking on board scientific progress in speaking of a conserved momentum vector rather than Descartes’s conservation of quantity of motion (volume\(\cdot \)speed). Whether Leibniz’s conservation of vis viva, proportional to mass and the square of speed, was right was unc...
where is the four-velocity field of the dust distribution, which is of course not diagonal. Again the quantity is a scalar field, i.e., the energy density as measured in the rest frame of the medium. Jul 21, 2022 #8 martinbn Science Advisor 4,116 2,188 pervect said: I'm...
Why does mass increase with Velocity (speed of light)? Why is there more matter than antimatter? Why is time not considered a form of energy? Explain Einstein's equation E = mc2 in simple terms. Why is there far more matter than antimatter in the observable universe? Why it's not possi...
In a similar way, cultural ES are considered to support the health and well-being of people having access to them and, with this, reduce their susceptibility to experience harm. Despite being less tangible, it is a scientifically well-established concept that ecosystems, especially green spaces,...
A 32 kg gun is standing on a frictionless surface. The gun fires a 55.1 g bullet with a muzzle velocity of 320 m/s. The positive direction is that of the bullet. Calculate the momentum of the bullet Why is momentum considered to b...