How are volcanoes constructive vs. destructive?

The back wall of an auditorium is 30.0 m from the stage. If you are seated in the middle row, how much time elapses between a sound from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall?

Friction force equation

How do you calculate the surface area and pressure in hydraulics in slave and master pistons using this example? E. g. master piston pressure = 20N and the surface are is 10cm² and the slave piston's pressure is 60N.

Your boss asks you compare two sound waves and determine which has the higher frequency. Wave A has a period of 4⁄100 second and Wave B has a period of 1⁄7 second. What would you tell your boss? A. Wave B has the higher frequency.

A block of mass 3.5 kg slides down a frictionless inclined plane of length 6.4 m that makes an angle of 30 degrees with the horizontal. if the block is released from rest at the top of the incline, what is its speed at the bottom

Which statement is true for electric field lines? A. Field lines should always be parallel to the equipotential lines. B. Field lines should always be perpendicular to the equipotential lines. C. Field lines should always be parallel to each other.

What distance was an object moved by a force of 40 N if the work was 600 joules

How do I use a metric conversions chart

Do you think Pluto should be considered a planet? Why or why not?

An object starts from rest at time t = 0.00 s and moves in the + x direction with constant acceleration. The object travels 14.0 m from time t = 1.00 s to time t = 2.00 s. What is the acceleration of the object? a) 5.20 m/s^2 b) 10.4 m/s^2 c) 8.