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A spring is hung from the ceiling. A 0.600-kg block is then attached to the free end of the spring. When released from rest, the block drops 0.190 m before momentarily coming to rest, after which it moves back upward.
(a) What is the spring constant of the spring?
_______N/m
(b) Find the angular frequency of the block's vibrations.
________rad/s
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Why is you are not harmed with the contact of a charged metal ball, although its voltage may be very high? Is the reason similar to why you are not harmed by greater-than-10000 C sparks from the Fourth-of-July sparkler? Define your answer in terms..
A spherical concave lens has a focal length of 20cm, and an object is placed 15cm from the lens. estimate of the image distance and give image characteristics
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