Year in review and explanation of test
... B1. A solid metal ball and a hollow plastic ball of the same external radius are released from rest in a large vacuum chamber. When each has fallen 1m, they both have the same: (A) inertia (B) speed (C) momentum (D) kinetic energy (E) change in potential energy ...
... B1. A solid metal ball and a hollow plastic ball of the same external radius are released from rest in a large vacuum chamber. When each has fallen 1m, they both have the same: (A) inertia (B) speed (C) momentum (D) kinetic energy (E) change in potential energy ...
Lecture Notes 12: Lienard-Wiechert Retarded Potentials for Moving Point Charge, Retarded Electric and Magnetic Fields Associated with Moving Point Charge
... {However, it is not due to special / general relativity (yet)!!} Consider a long train moving towards a stationary observer. Due to the finite propagation time of EM signals, the train actually appears (a little) longer than it really is! (If c ≈ 10 m/s rather than 3 × 108 m/s, this motional effect ...
... {However, it is not due to special / general relativity (yet)!!} Consider a long train moving towards a stationary observer. Due to the finite propagation time of EM signals, the train actually appears (a little) longer than it really is! (If c ≈ 10 m/s rather than 3 × 108 m/s, this motional effect ...
Simple Machines
... advantage. In diagram 3, the addition of a fixed pulley yields a lifting advantage of 3. The tension in each line is W/3, and the force on the axles of each pulley is 2W/3. As in the case of diagram 2a, another pulley may be added to reverse the direction of the lifting force, but with no increase i ...
... advantage. In diagram 3, the addition of a fixed pulley yields a lifting advantage of 3. The tension in each line is W/3, and the force on the axles of each pulley is 2W/3. As in the case of diagram 2a, another pulley may be added to reverse the direction of the lifting force, but with no increase i ...
Lecture Notes 10: Electrostatic Fields Inside A Dielectric, Boundary Conditions on E, D and P
... Thus a uniformly polarized dielectric sphere of radius δ with uniform polarization Ρ = Ρ o xˆ is equivalent to two uniformly oppositely charged spheres whose centroids are displaced from each other by a distance d δ . See figures on the immediately following page: ...
... Thus a uniformly polarized dielectric sphere of radius δ with uniform polarization Ρ = Ρ o xˆ is equivalent to two uniformly oppositely charged spheres whose centroids are displaced from each other by a distance d δ . See figures on the immediately following page: ...
motion in straight line
... 1. A person standing on the edge of a cliff, at some height above the ground below, throws one ball straight up with initial speed u and then throws another ball straight down with the same initial speed. Which ball, if either, has the larger speed when it hits the ground? Neglect air resistance. 2. ...
... 1. A person standing on the edge of a cliff, at some height above the ground below, throws one ball straight up with initial speed u and then throws another ball straight down with the same initial speed. Which ball, if either, has the larger speed when it hits the ground? Neglect air resistance. 2. ...
Free fall
In Newtonian physics, free fall is any motion of a body where its weight is the only force acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it and it moves along a geodesic. The present article only concerns itself with free fall in the Newtonian domain.An object in the technical sense of free fall may not necessarily be falling down in the usual sense of the term. An object moving upwards would not normally be considered to be falling, but if it is subject to the force of gravity only, it is said to be in free fall. The moon is thus in free fall.In a uniform gravitational field, in the absence of any other forces, gravitation acts on each part of the body equally and this is weightlessness, a condition that also occurs when the gravitational field is zero (such as when far away from any gravitating body). A body in free fall experiences ""0 g"".The term ""free fall"" is often used more loosely than in the strict sense defined above. Thus, falling through an atmosphere without a deployed parachute, or lifting device, is also often referred to as free fall. The aerodynamic drag forces in such situations prevent them from producing full weightlessness, and thus a skydiver's ""free fall"" after reaching terminal velocity produces the sensation of the body's weight being supported on a cushion of air.