Physics, 24.10.2019 10:43 dogsrdabest

5. which of the following sets of conditions would result in the highest velocity for a sound wave traveling through air?
a. a warm and humid day with a wind moving in the same direction as the sound
b. a warm and dry day with a wind moving in the opposite direction as the sound
c. a cold and dry day with a wind moving in the same direction as the sound
d. a cold and humid day with no wind

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The answer is A. A warm and humid day with a wind moving in the same direction as the sound.

Sound waves travel through a medium such as solid, liquid, or gas. It travels faster when the molecules of its medium are closer together. This is the reason why it travels the slowest through dry air. When air is wet or humid, sound can travel faster because sound travels faster through water.

When sound waves pass through air, the most important factor that affects it is temperature. The higher the temperature, the faster the molecules vibrate. This allows sound waves to travel faster.

Answer from: Quest

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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