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Flashcards in past paper questions Deck (15):
0

outline how the molecular model of an ideal gas accounts for the rise in temperature.

the molecules gain energy by the collisions as a result of the piston moving so the average KE of the molecules increases, the temp is a measurement of the av KE, so if the AV KE increases, so does the temperature

1

define impulse:

Impulse is a change in Momentum. impulse equals force times the time that force acts...

2

by applying newtons law of motion to the collision of two particles, deduce that momentum is conserved in the collision

when force are in contacts, the forces acting on them are = and opposite. impulses are equal and opposite so changes in momentum are = and opposite. total change in momentum is equal to zero. therefore, momentum is conserved.

3

transverse wave:

the particles of a medium vibrates at right angles to the direction of energy transfered

4

longitudinal waves

the particles vibrate in the same direction as the direction of energy transfer

5

frequency

1 over the period.

6

power:

the ratio of work per time

7

a constant force of magnitude F moves form an object at constant speed V in the direction of the force. deduce that the power P required to maintain constant speed is given by the expression
P=Fv

P= work/time= F

8

nucleide

an atom or neucleus that is characterized by its constituents in its neucleaus (Proton and neucleon number)

9

Isotope

an element containing the same # of protons, but a different neuceon number

10

more neucleons ='s?

greater magnitude of binding energy

11

define electric field strength:

the forced per unti charge exherted on a small test charge

12

describe the concept of drift velocity as applied to the conduction electrons in a conductor

electrons have high random speeds when accelerated by an electrical field. inside a conductor, although they collide, they obtain a net speed in the diretion opposite the field dirretion

13

define electromotive force:

the power supplied per unit current

14

e.m.f. =?

total current + PD across internal resistance