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)

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

The rocket is fired vertically and tracked by the radar station shown. when θ reaches 66°, other corresponding measurements give the values r = 32700 ft, r¨ = 85 ft/sec2, and θ˙ = 0.019 rad/sec. calculate the magnitudes of the velocity and acceleration of the rocket at this position.

Atennis player used a tennis racket to hit a tennis ball with a mass of 0.25 kg with a force of 5.25 newtons. how does the force the tennis racket exerted on the tennis ball compare with the force the tennis ball exerted on the tennis racket? a. the force of the tennis racket on the tennis ball is equal in magnitude and opposite in direction to the force the tennis ball exerted on the tennis racket. b. the force of the tennis racket on the tennis ball is equal in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. c. the force of the tennis racket on the tennis ball is less in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. d. the force of the tennis racket on the tennis ball is greater in magnitude and opposite in direction as the force the tennis ball exerted on the tennis racket.