2. Cause and Effect Suppose that an electric
current flows in a straight wire. The current
changes so that it flows in the opposite
direction. What changes occur in the magnetic
field, and what stays the same?

What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?