jan mocks dk

Question 1

graph of grav field strength against r

Question 2

graph of grav potential against r

Question 3

height of geostationary satellites

Answer 3

35768 above earths surface

Question 4

height of polar satellite

Answer 4

200-1000km

Question 5

damping graph

Answer 5

same as a resonance graph with lower peak and moved left

Question 6

relationship between d and t in free fall

Answer 6

d is prop to t^2

Question 7

thinking distance prop to

Answer 7

prop to speed

Question 8

breaking distance prop to

Answer 8

prop to speed^2

Question 9

mass

Answer 9

measure of an objects resistance to acceleration

Question 10

g varies due to

Answer 10

• non uniformities in the shape and composition of the planet
• effect of earths rotation about its axis
• varying from zero at poles to max at equator

Question 11

couple

Answer 11

2 = and oppositely directed parallel coplanar forces whos lines of action dont intersect
- produce a rotation
- cant produce a resultant force so cant. produce linear motion

Question 12

torque due to a couple

Answer 12

moment of a couple
F*perp distance between the forces

Question 13

man standing in lift eq

Answer 13

M(a+g) = F

Question 14

pressure in liquids

Answer 14

pgh + 101kPa
pressure due to water + atmospheric

Question 15

drag prob to

Answer 15

speed^2

Question 16

perpetual motion

Answer 16

• a device in which once started will continue to move and do work without any further input of energy
• impossible due to conservation of energy

Question 17

forms of energy

Answer 17

• kinetic
• GPE
• chemical
• elastic potential
• electrical potential
• nuclear
• radiant
• sound
• thermal

Question 18

gpe

Answer 18

due to the position of a mass in a uniform grav field = mgh

Question 19

chemical energy

Answer 19

due to the bonds between atoms in a substance

Question 20

radiant energy

Answer 20

due to EM waves

Question 21

thermal energy

Answer 21

due to randomly distributed potential and kinetic energies of atoms within a system

Question 22

KE SHM

Answer 22

1/2 k(A^2 - x^2)

Question 23

keplers second law

Answer 23

a line segment joining a planet and the sun sweeps out = areas during = time intervals

Question 24

spring in parallel/ series

Answer 24

in series - reciprocal sum
in parallel - add