5 (a) A teacher has four rods that are identical except that each is made from a different material.
He paints 1 cm bands on the rods using a paint that changes colour when it is heated.
The paint is red when cool but changes to clear at 47°C.
1 cm
The teacher uses this apparatus to investigate the rate of conduction in
aluminium, copper, plastic and wood.
rod
hot water
(1) Describe how the teacher should perform this investigation.
You should include details of measurements taken.
(4)

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s