To protect a material from the influence of an external magnetic field, the material should be kept in?
a. soft iron ring
b. square steel ring
c. loop of copper wire
d. triangular zinc

Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)

Which wave is the result of amplification and produces a louder sound