what must be the distance between source of sound and mountain to give an echo in 5 seconds?, (speed of sound at 0°c=33m/sec

True or false nodes and antinodes occur in longitudinal waves

A particle is moving along the x-axis with velocity v (t) = sin2t. At time t = pi/2 it has position x = 3. Find the total distance, s traveled by this particle on the interval 0 < = t < = pi.

Which statement about electric force is true?

4. The Cenozoic Era is also referred to as the A. First Era. B. Age of Dinosaurs. C. Age of Fish. D. Age of Mammals.

A transfer of heat within a liquid or gas that involves warm particles moving in currents is - A. connection. B. convection. C. conduction. D. correction.

When a fork is placed in a hot piece of lasagna, thermal energy is transferred up the fork by ...

Levi observed properties of four different waves and recorded observations about each one in his chart.

A rocket is shot straight up from the earth, with a net acceleration (acceleration by the rocket engine minus gravitational pullback) of during the initial stage of flight until the engine cut out at sec.

Which moon has a thick atmosphere made mostly of nitrogen?

J. J Thompson proposed that atoms were made up of positively charged particles with electrons scattered into them. How did he reach this conclusion?