Why is “soft” iron used for the core of an electromagnet? it has no magnetic domains. it is easily magnetized. it is difficult to magnetize. it is a permanent magnet.

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?