Category: Physics

Where is the magnetic field strongest? center Why does electricity produce magnetic fields? Inside a magnet, the atoms at one end contain electrons that all spin in one direction – meanwhile the atoms at the other end contain electrons that all spin in the opposite direction. Rather than spinning in a balanced way, the electrons […]

Why should the number of classes in frequency distribution be between 5 and 20? Why should the number of classes in a frequency distribution be between 5 and 20? If the number of classes in a frequency is not between 5 and 20, it may be difficult to detect any pattern. Organizing the data into […]

What does the commutator do in an electric motor? On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils. What are the […]

How do you calculate projectile? Projectile motion equations Horizontal velocity component: Vx = V * cos(α) Vertical velocity component: Vy = V * sin(α) Time of flight: t = 2 * Vy / g. Range of the projectile: R = 2 * Vx * Vy / g. Maximum height: hmax = Vy² / (2 * […]

What is the difference between natural and forced convection? The key difference between natural and forced convection is that in natural convection, the motion of the fluid is influenced by natural means whereas, in forced convection, the motion of fluids is influenced by external means. What is meant by natural convection? Natural convection is a […]

What are the two mechanisms by which metal deforms? The mechanism by which metals deform is via the motion of linear defects at the atomistic scale, called dislocations (see the figure). In metals, dislocations are usually mobile, and their motion provides for the irreversible shifting of atomic planes in a process called slip, resulting in […]

Is infrared reflected by mirrors? Do mirrors reflect only visible lights, or do they reflect light of other frequencies (if so then which types–x-ray, infrared, gamma, etc)? Yes and no, a normal mirror reflects visible light and likely near IR and UV, but it’s not optimized for anything past that. Do Humans give off infrared […]

What is mean by change of season? : the change from winter to spring, spring to summer, etc. What is another word for season? What is another word for season? period time active period autumn division fall interval juncture occasion opportunity What’s a season? A season is a period of the year that is distinguished […]

What is the relation between electric field and distance? This is known as an inverse square law. Electric field strength is location dependent, and its magnitude decreases as the distance from a location to the source increases. And by whatever factor the distance is changed, the electric field strength will change inversely by the square […]

Which of the following properties gets smaller as the strength of intermolecular forces increases? As the strengths of intermolecular forces increase, surface tension, viscosity, melting point and boiling point increase, while vapor pressure decreases. Molecular solid: Made up of discrete covalently bonded molecules held together in the solid phase by weaker forces (LD, dipole, or […]