W=mg
W=75(1.6)
W=120N
a. 120N
If you're listening to a sound that has a steady pitch, and suddenly the
pitch goes up, then you know that two things could have happened:
EITHER ...
-- The person or other source making the sound could have
raised the pitch of the sound being produced.
OR ...
-- The person or other source making the sound could have
started moving toward you.
OR ...
-- both.
Even if the pitch of the sound leaving the source doesn't change,
you would still hear it increase if the source starts moving toward
you. That's the so-called "Doppler effect".
Answer:
B.1.6 N*s
Explanation:
According to the principle of conservation of momentum, we have:
The final mass is obtained adding the masses of the two cars since they stick together after the collision. So, 
. Recall that the 0.4 kg cart collides with the stationary 0.8-kg cart. So 
The magnitude of the impulse is defined as the mass multiplied by the change in the speed:
