One terminal of a car battery is said to be connected to "ground." Since it is not really
connected to the ground, what is meant by this
expression?

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

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 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage