The doppler effect is the change in observed frequency due to

a. the type of medium the wave is in

b. the type of wave

c. the original frequency of the source

d. the motion of the source or observer

1. What are electromagnetic waves?

Which category of elements have the property of being malleable an ductile?

A teacher performing demonstration finds that a piece of cork displaces 23.5 ml of water. The piece of cork has a mass 5.7 g. What is the density of the cork?

The direction of the magnetic field produced by an electric current will change when the direction of the _ changes.

What's the purpose of life?

As stream velocity decrease, which factor will likely increase? A) erosion of the stream bank B) deposition of material in the stream C) amount of material carried downstream D) size of the particles carried downstream

What cells in the nervous signals travel through the nervous system

A mechanic pushes a 3.60 ✕ 103-kg car from rest to a speed of v, doing 5,130 j of work in the process. during this time, the car moves 21.0 m. neglecting friction between car and road, find v and the horizontal force exerted on the car.

Anika asks Eva to roll a basketball and then a bowling ball to her. Which requires more force to roll, and why?

Why does a buoyant force act on every object in a fluid? Pressure pushing up on the bottom of the object is greater than the pressure pushing down on the top.