page 04 3. A block of mass 6·0 kg and a block of mass 8·0 kg are connected by a string. A force of 32 N is applied to the blocks as shown. 8·0 kg 6·0 kg 32 N A frictional force of 4·0 N acts on each block. The acceleration of the 6·0 kg block is A 1·7 m s−2 B 2·0 m s−2 C 2·3 m s−2 D 2·9 m s−2 E 5·3 m s−2. 4. A person stands on a weighing machine in a lift. When the lift is at rest, the reading on the weighing machine is 700 N. The lift now descends and its speed increases at a constant rate. The reading on the weighing machine A is a constant value higher than 700 N B is a constant value lower than 700 N C continually increases from 700 N D continually decreases from 700 N E remains constant at 700 N. 5. Enceladus is a moon of Saturn. The mass of Enceladus is 1·08 × 1020 kg. The mass of Saturn is 5·68 × 1026 kg. The gravitational force of attraction between Enceladus and Saturn is 7·24 × 1019 N. The orbital radius of Enceladus around Saturn is A 2·38 × 108 m B 9·11 × 1013 m C 5·65 × 1016 m D 8·30 × 1027 m E 3·19 × 1033 m.