1. (a) (0) A student measures the current through a thermistor at varying potential
differences. They plot a graph for their results. Sketch below the graph they would
expect to see. [2 marks]
Current (A)
P. d (V)​

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?