14) Which of the following simple machines provides the least mechanical advantage?
a) a block-and-tackle assembly that lifts a 1100
N load when you provide a 200 N input force
b) All four machines are equally efficient.
c) a wheel of radius 0.73 m with an axle of
radius 0.10 m
d) a wedge with sides 63 mm long and a base
10 mm wide
e) a lever 1 m long whose fulcrum is 63 cm
from the input force and 37 cm from the load

true

explanation:

yup its correct its: c) b b

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

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