The following table lists the speed of sound in various materials. use this table to answer the question.

substance speed (m/s)
glass 5,200
aluminum 5,100
iron 4,500
copper 3,500
salt water 1,530
fresh water 1,500
mercury 1,400
hydrogen at 0°c 1,284
ethyl alcohol 1,125
helium at 0°c 965
air at 100°c 387
air at 0°c 331
oxygen at 0°c 316
sound will travel the slowest in

air
glass
aluminum
water

What happens in a global convection cell

Question 7 [2 marks] in the circuit below, the electromotive force generated by the battery is e = 6.0 v, and the resistances are r1 = r4 = 1.0 q, r2 = r3 =2.0 q. r. the power delivered by the battery to the circuit is closest to a. 6 w в. 12 w с. 15 w d. 18 w e. 20 w final exam autumn 2014 page 5 of 9 68037 physical modelling faculty of science [2 mark] question 8 with reference to question 7, the current through resistor r2 is closest to a. 1 a в. 2 а c. 3 a d. 4 a e. 6 a

Newtons view of arrangement of the universe