Afire truck is equipped with a horn that produces sound waves at a frequency of 1000hz. if the truck is moving at a velocity of 25m/s on a hot summer day with temperature of 40 degrees celcius. a) find the velocity of sound at 40 degree celcius
use this velocity to find the frequency of the sound as heard by an observer when the truck is
b) approaching the observer and
c) moving away from the observer

the following is queen elizabeth’s purposes:

- to encourage the parliament that the technique of picking successors to the seat based merely on birthright needs to be reviewed.

- (not) to convince the parliament that her kid should not be measured as a likely choice for heir to the english power.

- to persuade the parliament that merely since she has a child does not assure that the kid will be a capable leader.

- to sway the parliament how shattering it could be if they proceeded discourteously concerning her or her child.

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.

Answer (d) the universe had cooled enough for atoms to combine, protons and neutrons were too far apart to form nuclei;