Miya's pencil rolls off her desk and lands 0.50 m away. If the desk's height is 1.0 m,
how long did it take the pencil to reach the
floor? How fast was the pencil going when
it left the desk? Ignore the pencil's
rotation.
Pls help

What does si stand for,when referring to a system of measurement

Emagnitude of the electrical force acting between a +2.4 ×  10–8  c charge and a +1.8 ×  10–6  c charge that are separated by 0.008 m is    n, rounded to the tenths place.

Aheat engine that operates on a carnot cycle has an efficiency of 0.420 when its low-temperature reservoir is at 10 ∘c.part aby how many degrees celsius must you increase the temperature of the high-temperature reservoir to increase the efficiency to 0.600 if you continue to use the same low-temperature reservoir?