6. (A) A convict escapes through a tunnel and runs at 7.2 km/h. 15 minutes later, the tunnel is discovered and the guards give chase at 10.8 km/h. (4 marks)
(hint: you may need to do a substitution to solve this but there is also a much easier way
hint hint, nudge nudge, wink wink)
(a) How long does it take the guards to catch him, in seconds?
(b) How far is he from prison when he is caught?

If you mix chlorine lithium in nickel together which two elements would be the most reactive

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.