If you are standing up on a suspended plane: Torques and the balance
Question: A horizontal beam is attached to a wall. The length and weight are 10.0 m and 200 N, respectively. […]
Category: Physics
Find the angle of a horizontal projectile motion!!
Question: A ball is thrown horizontally from the height of 40.0 m. The horizontal range of the projectile is known […]
Quantum mechanics: Converting momentum into configuration spaces
Question: In quantum theory, the wave function can be convertible either in momentum space or in configuration space. Suppose we […]
Ray optics: A rectangular glass and a convex lens, then find the index of refraction of the glass
Question: A rectangular glass, a convex lens, and a screen are placed as shown in the figure. A 2.0-cm-high object, […]
Potential energy created by one-dimensional infinite numbers of charges
Question: Infinite numbers of positive and singly negative charged ions are placed in a straight line alternatively with spacing of […]
Use Young’s double slit to find laser’s wavelength
Question: There is a double slit whose separation distance of slits is 0.100 mm. The distance from the slit to […]
Finding the capacitance of a parallel plate capacitor with two different dielectric constants
Question: There is a parallel plate capacitor the area of \(L^2\) and separation distance of \(d\). A half of the […]
De Moivre’s theorem and its application
Question: By using De Moivre’s theorem, simplify the following expressions: (1) \(\left(\frac{1+\sqrt{3}i}{2}\right)^{10}\) (2) \(\left(\frac{\sqrt{3}+i}{1+i}\right)^{6}\) Answer: De Moivre’s theorem reads \[ […]
Dropping a coin to find out the depth of a well
Question: You released a coin in order to find the depth of a well. The time between dropping the coin […]
Static equilibrium of forces
Question: When this system is at equilibrium, find the tension in cord b, \(T_b\), knowing that the hanging mass is […]