Which of the following is most likely to yield the fossils that scientists reconstruct the earth's biological history?

a.
sedimentary rock

b.
evidence of folds

c.
samples of igneous rock

d.
metamorphic rock

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?