Why is soft iron used for the core of an electromagnet?

Suppose we have two identical boxes of matter, A and B, that are in thermal contact but cannot exchange materials. They come to thermal equilibrium. System 1 consists of box A alone, while system 2 consists of both boxes A and B.

If it were somehow possible for you to drive your car along some stellar highway in the sky to the location of this explosion, how long would it take you to get there, assuming you drove at 100 km/h km/h

When will the next solar eclipse happen

An object's speed is determined from the object's

How does a positively charged metal ball become neutral

Is time the fourth dimension?

What is the speed of a proton after being accelerated from rest through a 5.6x107 V potential difference?

Assume that a pendulum used to drive a grandfather clock has a length L0=1.00m and a mass M at temperature T=20.00°C. It can be modeled as a physical pendulum as a rod oscillating around one end.

An object has more momentum if it has which of the following? A. a large mass and low velocity B. a high velocity and small mass C. a high velocity and large mass D. a low velocity and small mass

What is meant by the "objectivity" of web documents, and what are the three things to look for when evaluating a website for objectivity?