A loose or worn belt. Also check the power steering fluid.
Bad CV joint, loose rim, Loose caliper
loose or worn belt
lifters are beginning to go. timing chain (if vehicle is equiped) may be coming loose. and or exhaust pieces are loose.
from a distance away why does a jet sound loader than a lawn mower
Could be your brakes. If you have drum brakes not disk brakes that sound will happen when your shoes are worn down to the rivets. Some of the hardware such as springs, may have came off as well, which will make the loose metal sound.
from a distance away why does a jet sound loader than a lawn mower
Possible causes of a radiator knocking sound include air trapped in the system, loose components, or sediment buildup. To resolve this issue, you can bleed the air out of the system, tighten any loose components, or flush the radiator to remove sediment.
The sound of a jet engine vibrates more than the sound of a lawn mower.
Loudness: Sound power is the cause, but sound pressure makes the effect. Scroll down to related links and look at "Sound pressure and sound power - Effect and cause".
Check to see if your trunk is open or if the clasp that holds it closed is loose.
Most common cause would be a loose brake caliper mounting bolts.