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Free physics problems and tutorials with solutions and explanations. SAT questions also included along with HTML 5 apps to highlight concepts.
Solutions and detailed explanations to projectile problems are presented . These solutions may be better understood when projectile equations are first reviewed. Detailed Solutions. Problem 1. An object is launched at a velocity of 20 m/s in a direction making an angle of 25° upward with the horizontal. a) What is the maximum height reached by ...
Free SAT II Physics Practice Questions with Solutions on Electric Fields and Forces with detailed solutions. Electrostatic problems relted to charges, forces and fields are presented along with their solutions.
Refraction of Light Rays at Interfaces. Light rays travel in different mediums at different speeds. In vacuum, for example, light travels at the speed of 3×10 8 m/s. This is the highest speed possible in physics.
Inclined plane problems involving gravity, forces of friction, moving objects etc. require vector representations of these quantities. Components are better in representing forces using rectangular system of axes since they make calculations such as the addition of forces easier.
Gravity problems are presented along with detailed solutions. Problem 1: An object is dropped, with no initial velocity, above the surface of planet Big Alpha and falls 13.5 meters in 3 seconds. The radius of planet Big Alpha is 5.82×10 6 meters.
Linear momentum questions with solutions and explanations are presented. These questions may be used to practice for the SAT physics test. Questions. If the speed and mass of an object are doubled, which of the following is true?
What are Forces in Physics? A force describes, quantitatively, the interaction between two objects. A force is a vector quantity: its has a magnitude and a direction. You need to exert a force to pull a box on the floor. You use force to push a table. The weight of an object is the force of attraction that the earth exerts on this object.
Principles of Optical Fibers: Total internal refraction. An optical fiber comprises a core and a cladding as shown in the diagram above. The core has refractive index n 1 and the cladding has refractive index n 2 such that n 1 > n 2 or n 1 / n 2 > 1. Use Snell's law to write n 1 sin i = n 2 sin r.
Optics questions with solutions and explanations at the bottom of the page. These questions may be used to practice for the SAT physics test. The questions are about reflection, refraction, critical angle, lenses, reflectors, light rays propagating through different mediums, refractive index of materials, ..etc.