Suppose you are determining the velocity of a baseball by measuring the distance it travels, X, in a time T. You measure X to be 32.5 m ± 0.5 m, and you measure T to be 10 seconds. Assume that T is known "exactly", i. e. the error in T is so small that it can be neglected. Compute the velocity V = X/T, and also compute ζV, the uncertainty in V.

V = 3.25 m/s ζV= ±0.02

Explanation:

V=32.5/10 =3.25

ζV= (error/measurement(X))-(error/measurement(T))

=0.5/32.5 -0/10=0.015≈ ±0.02 to be at the same decimal places as the calculated value (V=3.250±0.015 m/s)

from 1609, galileo galilei used the recently invented telescope to observe the sun, moon and planets. he saw the mountains and craters of the moon, and for the first time revealed the planets to be worlds in their own right. galileo also provided strong observational evidence that planets orbited the sun.

his discoveries about the moon, jupiter's moons, venus, and sunspots supported the idea that the sun - not the earth - was the center of the universe, as was commonly believed at the time.galileo turned his gaze toward venus, the brightest celestial object in the sky - other than the sun and the moon.

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.