When choosing a suitable metal for use in overhead electrical cables, engineers prefer a metal for which the expression (Density) x (Resistivity) has as small a value as possible. Based on table 1, which of the following metals would be the most suitable for use in an overhead cable?

48 competitors entered the men's 100 metres freestyle event at this year's Muscan Swimming Championships. They were divided randomly into 6 heats, with the fastest 16 qualifying for the semi-finals.These are the results of the 6 heats.From which heat was there only one qualifier for the semi-finals?

A ballet dancer of mass 80 kg and a wingspan of 1m is executing a spin. She then folds her arms and brings them to within 20cm from the central axis of her body. If she was initially making 3 rotations per second, how many does she make now?

A ballet dancer of mass 80 kg and a wingspan of 80cm is executing a spin. She then folds her arms and brings them to within 20 cm from the central axis of her body. If she was initially making 3 rotations per second, how many does she make now?

A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?

A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?