6
Fig. 6.1 shows a piece of apparatus used to show the transfer of thermal energy in liquids.
crystals
coloured water
glass
water
tube
heat
The glass tube is filled with cold water. Crystals that dissolve slowly are inserted into the bottom of
the tube. The water around the crystals becomes coloured.
When the glass tube is heated as shown in Fig. 6.1, the coloured water moves.
(a) (i) On Fig. 6.1, draw arrows indicating the direction of movement of the water in each section
of the tube.
(ii) State the name of this method of thermal energy transfer in the water.
(1)
FO
(b) Explain why the water moves in this way.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Which of the following is not a characteristic of s waves? a. travel slower than p waves. b. cannot be detected in locations more than 105° from an earthquake’s epicenter. c. travel through solids and liquids. d. only affect coastal regions.