A motorcyclist is moving 24.5 m/s toward a stationary siren, and
hears an 894 Hz sound. What is
the frequency of the siren when
the cyclist is stationary?
(Hint: 894 Hz is the Doppler-shifted
frequency.)
(Speed of sound = 343 m/s)
(Unit = Hz)

Contrast the force of gravity between these pairs of objects a 1 kg mass and a 2 kg mass that are 1 m apart and two 2 kg masses that are 1 m apart

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.