RGeologists apply various methods to study the layers of the Earth. Which of the following is a method used to study the Earth's layers? A. Scientists use seismic waves to map the atmosphere conditions anove Earths crust.
B. Scientists map seismic waves to determine the atomic structure of materials that lie beneath Earths surface.
C. Scientists measure vibrations of Earth's surface using a compass (an instrument that measures seismic waves).
D. Scientists measure the time it takes for seismic waves to reach a seismograph (an instrument that measures seismic waves).

Three point charges, two positive and one negative, each having a magnitude of 20 μc are placed at the vertices of an equilateral triangle (30 cm on a side). what is the magnitude of the electrostatic force on the negative charge

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.

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?