Amassless spring has unstretched length l₀ and force constant k. one end is now attached to the ceiling and a mass m is hung from the other. the equilibrium length of the spring is now l₁.
(a) write down the condition that determines l₁.
suppose now the spring is stretched a further distance x beyond its new equilibrium length. show that the net force (spring plus gravity) on the mass is f = -kx. that is, the net force obeys hooke's law, when x is the distance from the equilibrium position — a very useful result, which lets us treat a mass on a vertical spring just as if it were horizontal.
(b) prove the same result by showing that the net potential energy (spring plus gravity) has the form u (x) = const + 1/2 kx².

. west

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it