Identify the scenarios below as to whether they would increase, decrease, or not change the frequency in which a string vibrates and thus change its pitch. Assume that no other changes are happening.

1. Tightening a string for greater tension
2. Replacing a thin string with a thick string
3. Increasing the effective length of the string

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

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 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Which of the following occurs along coasts during the day?