Recent content by mani

That was a bit above my head! In kinematics, i can take a "rigid" set of points as a Frame, if someone can assure me that it is not rotating but moving only translation. If any other set of points is moving only in translation w.r.t. the above "certified" frame, that also can be accepted as a...

"I don't see how it makes a difference whether you are working with kinematics or dynamics;" Kinematics is "Space" (or Geometry) + Time; where we can talk about moving "points"only. Inertia is a concept that comes with matter under Dynamics. Rotation can be detected only with inertia.

"Reference Frame" How is a "Reference Frame" defined absolutely (i.e. without introducing another Frame) under Kinematics ?

Under "Dynamics", an Inertial frame of Reference can be defined absolutely as one that does not use "pseudo" or inertial forces. Under "Kinematics" how do we define absolutely (any) "Frame of Referaece"?

The more fundamental the concept the more difficult it is even to explain. The concept is associated with "change". Time can be considered as that quantity against which we "measure" change.

crisp new word -------------------------------------------------------------------------------- Volume is the quantity. Do we give the same name to the entity? What do we do when we want to denote a room (full of objects and air)? Space includes surfaces and lines. To be rigorous...

crisp new word Volume is the quantity. Do we give the same name to the entity? Space includes surfaces and lines. To be rigorous, we have to say "Three Dimensinal Surface". This long word is shortened first as Tri Space; and further as"Trisp"

The space entity whose quantity is "Length" is the "Line" The space entity whose quantity is "Area" is the "Surface" The space entity whose quantity is "Volume" is the "?" The term "solid" is not satisfactory, as the entity may be (the space occupied by) a body of liquid or gas. Anyone...

First, K = 0.5mv^2 is not "average" kinetic energy- it is kinetic energy- in fact it is the definition of kinetic energy- there is no "derivation". At some time, back at the beginning of "physics" someone notice that, in many dynamics problems that quantity was conserved- so they gave it a name...

A 10.8 kg box is 5.0 m from the edge of a 12.96 m high cliff. Bob pushes the box over the edge of the cliff by applying a constant horizontal force to it until the box goes over the edge. The force of friction on the box is 49.0 N and the box lands 7.5 m from the base of the cliff. How much...

he attaches one end of a stout rope to the vehicle and the other end to the trunk of a nearby tree, allowing for a small amount of slack. The student then exerts a force F on the center of the rope in the direction perpendicular to the car-tree line. If the rope is inextensible and if the...

"a police officer begins pursuing a speeding car when it passes. If the car moves with a constant velocity of 60.0m/s, and the officer moves with a constant acceleration of 6.0m/s^2. How long will it take the officer to catch up to the car if he begins pursuing from rest?" Initial...

2 point particles, A and B, are a distance d apart in a vacuum. from time t=0 onwards, A has a constant nonzero velocity with magnitude v and a direction perpendicular to AoBo, where Ao and Bo are the initial positions of A and B... I think"perpendicular to AoBo" is correct not...

a police officer begins pursuing a speeding car when it passes. If the car moves with a constant velocity of 60.0m/s, and the officer moves with a constant acceleration of 6.0m/s^2. How long will it take the officer to catch up to the car if he begins pursuing from rest?" I used V(final) =...