A mixture a. Can always be separated using filtration
b. Contains substances that are not mixed in a specific ratio
c. Is made when two or more elements chemically combine with each other
d. All of the above

real, smaller and upside-down.   so the answer should be b.

this is poiselle's equation from fluid mechanic in physics. mech eng

the total distance traveled by the car is

30km + 49km = 79 km .

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.