The diagram shows an electromagnet made with copper wire, a steel nail, and a 1.5 V battery. Which action could cause this electromagnet to be
stronger?

A. Replace the steel nail with a plastic straw.

B. Replace the battery with a 6 V battery.

C. Reduce the number of coils of wire wrapped around the nail.

D. Reverse the direction of the battery in the circuit.

Correct answer is B!

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

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

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig