Which statements concerning how geologists locate an earthquake’s epicenter are accurate? Check all that apply. Geologists use seismic waves to locate the center of an earthquake.
The epicenter of an earthquake is located at the same place as the seismograph.
Geologists use data from two data stations to determine the location of an earthquake.
Geologists use data from three or more data stations to determine the location of the epicenter.
A seismograph measures the difference between the arrivals of P waves and S waves.

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!

The charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface