Describing the motion of an object can be difficult to do and using graphs help make motion easier to understand. Motion is a ch

Answer:

See answer below

Explanation:

Hi there,

To find the magnitude of electric field from a single charge, the following formula is used:

 where q is the charge in Coulombs (C), and r is the distance from the center of the charge in metres (m). k is the constant:

Put q in C: q=5.00*10^(-6)

Plug in values:

Answer:

B. Whales and porpoises signal each other by making sounds

Explanation:

Sound is a type of mechanical wave, which consists of oscillations of the particles in a medium. It is also classified as longitudinal wave, which means that the direction of the oscillation of the particles in the medium is parallel to the direction of propagation of the wave, forming alternating regions of higher particle density (compressions) and lower particle density (rarefactions).

Since sound is a mechanical wave, it just need a medium to propagate through. Therefore, it can travel through solids, liquids and gases.

In particular, the option

B. Whales and porpoises signal each other by making sounds

is an example of this: these animals emit ultrasound waves (a type of sound waves with high frequency), that travel through the water, and then are reflected back to the animal, allowing the animal to understand the distance of the object from which the wave has been reflected back.