How are radar and an approaching siren different? How are they similar? A.
Radar uses sound waves, and the siren uses radio, but both exhibit the Doppler effect.
B.
Radar uses radio, and the siren uses sound waves, but both exhibit the Doppler effect.
C.
The Doppler effect can be observed only in the approaching siren, but both devices use radio.
D.
The Doppler effect can be observed only with radar, but both devices use sound waves.

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.

Aipal measures a circuit at 1.2 a and 24 . using ohm’s law, what can he calculate for the circuit?