G Given the force vector F, the lever arm r, and the torque τ, which of the following is an expression for torque? τ = r ⨯ F F = r ⨯ τ τ = F ⨯ r τ = −r ⨯ F The weights hanging off the pulley exert a tension force on the edge of the inner disk. In what direction is the torque exerted by this force?

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

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

Which statement correctly describes the relationship between frequency and wavelength?