The length of an iron rod is measured by brass
scale. When
both of them are at 10°c, the measured
length is 50cm. What is the length of rod at
40c, when measured by the brass scale at 400
(a brass 24X100 kt)
- x K)
-6 )
(airon
1
iron = 16x 10^-6 K

The best answer i can think of is b

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.