In a location where the train tracks run parallel to a road, a high speed train traveling at 60 m/s passes a car traveling at 30 m/s in the opposite direction. How long does it take for the train to be 180 m away from the car?
a. 2.0 s
b. 3.0 s
c. 6.0 s
d. 9.0 s
e. 18.0 s
A
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A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz
After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in the air is 343 m/s. A) 68 Hz B) 69 Hz C) 70 Hz D) 71 Hz E) 72 Hz
At the instant a 2.0-kg particle has a velocity of 4.0 m/s in the positive x direction, a 3.0-kg particle has a velocity of 5.0 m/s in the positive y direction. What is the speed of the center of mass of the two-particle system?
a. 3.8 m/s b. 3.4 m/s c. 5.0 m/s d. 4.4 m/s e. 4.6 m/s
The transport of large particle sizes is greatest
A) in turbulent streams. B) when stream speed is very fast. C) where the gradient exceeds the base level. D) on the inside of a meander.
Compared to a recoiling rifle, the bullet that is fired has a greater
A) momentum. B) kinetic energy. C) none of the above