Question

1. You are in your car when you hear a siren. In which case will you hear the highest frequency soundwave from the siren?

a. You and the moving siren approach each other

b. You and the moving siren drive away from each other

c. You and the moving siren are going in the same direction, but you move slower than the vehicle with the siren

d. Neither you nor the siren are moving

e. You and the moving siren are going in the same direction but you move faster than the vehicle with the siren

2. An object undergoes projectile motion. The objects launch height and landing height are the same. It travels horizontally 1.20 km in 4.00 seconds. What angle would allow the object to travel the furthest horizontally?

Answer 1

1)The question can be solved using doppler effect.As the observer and listner is moving under different conditions ;

The general equation is

1). According to doppler effect. The general equation s = f [V -/+ is v +1-vo For both sets of sign uses the first sign when the motion is towards the other thing and the Second sign when the motion is away. a). from Vtvo s'=f as source and V- Vs listner approaching V - b) $'=$1 vo V+ Vs ] source and eistner moving away.

2) The horizontal range is maximum when it is projected at certain angle.The equation to find the angle is

R can be written as R= u2 sendo que sino coso g g. osmoved by projectil The farthest distance moved by maximum. when Sino XCOSO - sin 20 = maximum which is possible when; 20 = 1/2 => © = *4 Therefore at an angle ala ; it moves horizontal distance. maximum 100% = CO2