A ball falls freely from rest with an acceleration g. The variation with time t of its displacement s is given by s=1/2gt2 . The percentage uncertainty in the value of t is ±3% and that in the value of g is ±2%. What is the percentage uncertainty in the value of s.

Which of the following changes to a pipe would increase the conductance by a factor of 12? 1.quadrupling the length and tripling the radius.2.reducing the length by a factor of and doubling the radius.3.tripling the length and reducing the radius by a factor of .4.reducing the length but a factor of and doubling the radius.

More solar radiation is absorbed by earth’s surface than by

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2