From the choices below, choose all that are correct.

i. sound traveling faster through the air in the sahara desert than in antarctica.

ii. an astronaut hearing the loud explosion of a ship from a mile away in space.

iii. speeds and frequencies of sounds change as they pass through different mediums.
a) i
b) i and ii
c) i and iii
d) ii and iii

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

gravitational energy

electrical energy

kinetic energy

ligh energy