ads and disads of solar cells
ads:
no polluting gases, quiet, low maintenance, can be placed on roofs, clean, cheap to
run
disads:
intermittent supply, unattractive, takes up space, uses land, d.c. supply
how the sun is responsible for energy in fossil fuels
sun is the source for plants/living matter to grow
plant/animal remains compressed into fuel OR carbon/chemical energy stored in
plant/animal remains
how forces and acceleration of falling body change
mention of air resistance and weight of object
acceleration at start of fall is acceleration due to gravity = 10ms^-2
acceleration decreases as it falls
air resistance increases as speed increases
acceleration zero/terminal velocity reaches when
upward air resistance force = downward weight
pressure in terms of momentum
molecules/atoms collide with wall
molecules/atoms rebound
force on wall=total rate of change of momentum
force over area = pressure
why larger piston will move less in hydraulics
volume of oil moved at both same;
area of small x distance moved by small = area of big x distance moved by big (thus
distance moved by big less);
manometer cross section and h
h will not change with a change in cross-sectional area;
as pressure only dependent on h, g, P;
density from water method
water used in measuring cylinder;
volume of water known or read;
place ____ in the water and read the new level of water in cylinder;
subtract to find volume of ____;
