If 60 lbs of force must be applied to the valve for it to open, how much upward force must push rod X apply for the valve to open?

In what order do the effort, fulcrum, and resistance appear on a second class lever?

The U. S. Navy has long proposed the construction of extremely low frequency (ELF waves) communications systems; such waves could penetrate the oceans to reach distant submarines.

The astronomer who discovered the dwarf planet Eris suggests there might be another object far beyond the Kupier belt.

Which one of the following choices best describes an advantage of isometric exercise? A. Rapid strength improvement B. Improved strength across the entire range of motion C. Improved joint flexibility D. Motivational

Why are earthquakes considered sound waves instead of some other form of wave?

The equation e = mc2 relates mass and a. energy b. force c. work d. gravity

What should a scientist do to use scientific methods for determining the relative age of Earth's rocks? A be biased in opinion B disregard views of others C use creative ideas D prove that methods are non-testable

If a sample of gas is heated at a constant pressure what will happen to the volume of the gas

1. What is the speed of sound in air that has a temperature of 90.0 °C?

What effect does a doubling of the mass have upon the acceleration of the object? Be quantitative.