Achild is sending pulses down a stretched rope at a rate of 2 pulses per second. the distance between the pulses is 5 meters. what is the speed of the wave?
a. 5 m/s
c. 2 hz
b. 10 m/s
d. 2.5 m/s user: longitudinal seismic waves are known as
a. primary waves.
b. secondary waves.
c. surface waves.
d. transverse waves.

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87