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 ...
1 (a) State why force is a vector quantity. à n n án n c án n [1](b) A 20N force and a 15 N force act at the same time on an object of mass 14kg.Calculate(i) the maximum possible force on the object due to these two forces,force =...[1](ii) the acceleration c...
Now consider a radially freely infalling observer with 4-velocity ##V##. Such an observer follows a timelike geodesic and therefore $$ E' = g(K,V) = \alpha V^0 $$ is a constant of motion. Consequently, we can write the 4-velocity $$ V = \frac{E'}{\alpha}(\parti...
Why is displacement a vector quantity? Under what circumstances would a vector have components that are equal in magnitude? A velocity vector has a magnitude of 20 m/s and directed 30 degrees below the horizontal. What is the magnitude of V_x?
So too with planets around a central body. They're technically traveling in straight lines. It's just that their velocity vector is continuously changing so that it is always tangent to the path formed by an ellipse with one of its foci at the central body. It'd be easier to draw you...
On the one hand, the Eulerian or site-specific approach generates a ‘velocity vector field’ that describes the displacement of points relative to a fixed coordinate system. It is particularly suitable for organs with a one-dimensional expansion pattern such as roots (Beemster & Baskin, 1998),...
How is energy conserved in a transformation? 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?
This is captured by a quantity called the **moment of inertia I,** which is a measure of how hard it is to change an object's angular velocity. It is analogous to mass in linear motion in terms of its general effects on rotational motion. As with elements in the periodic tabl...
1). Then, there is a technical sense of observable which is any quantity, in the canonical formulation of general relativity, that has vanishing Poisson brackets with the constraints of the theory. There is yet another technical meaning, which is any quantity that can be used for characterizing...
Why is energy directly proportional to frequency? Becausethe velocity is constant, any increase in frequency results in a subsequent decrease in wavelength. ... Photon energy is directly proportional to photon frequency. Photon energy is measured in eV or keV (kilo-electron volts). The energy ran...