For a co-60 unit, the measured exposure is 200.0 r for a timer ting of 1.00 minute. for a timer setting of 2.00 minutes, the mea! sured exposure is 401.8 r. (a) calculate the timer error. (b) what is the exposure rate in units of r/min?

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

0 = 0.40 / 0 = 0

= 0.20 = 9.80 ⁄2 =?

=0 , = = 0.20 =0.50 0 0.40 ⁄

=0−122 =0−12(9.80 ⁄2)(0.50)2 =1.2