A train of 150m length is going towards North at a speed of 10m/s.A bird is flying at 5m/s parallel to the track towards south.The time taken by the bird to cross the train is?plz explain it with whole process.
2006-06-19 07:05:59 · 23 answers · asked by Lizzie 2 in Science & Mathematics ➔ Physics
10 seconds.
first you find the relative speed.
since the two are headed toward each other you add their respective speeds
vr = v1+v2 = 10+5= 15 meters/second
now you want to find the time it takes to cross 150 meters of the trains length at this speed
speed =distance/time
time = distance /speed = 150/15= 10seconds
2006-06-19 07:07:54 · answer #1 · answered by shogunly 5 · 0⤊ 3⤋
When velocities are this low,(5m/s and 10m/s) you can combine them just like you would think. Pretend that the trains is still and that the bird is flying at 10 + 5 = 15 m/s. How long does it take for the bird to fly the length of the train (150 m)? 150m divided by 15 m/s is 10 seconds.
Remember that this works if they are traveling the same direction too, but you have to subtract the velocities. If they are not travelling parallel to each other, it gets trickier, but it is still not too hard.
Hope this helps.
2006-06-19 07:12:40 · answer #2 · answered by crjensen77 2 · 0⤊ 0⤋
If the train north is going 10m/sec fast, and the bird is going 5m/sec fast to the south, add the speeds for a total 15m/sec fast. Take the train length, 150m divided by 15m/sec fast and the bird would pass the train in 10 seconds.
2006-06-19 07:15:29 · answer #3 · answered by st18 2 · 0⤊ 0⤋
If the bird were still, the train would pass it at 10m/s.
However, the bird is flying in the opposite direction of the train, which would add to the total speed. 10+5=15m/s
Length of 150m divided by total speed: 150/15=10
10 seconds
2006-06-19 07:09:45 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Every second, the bird flies 5m and the train moves 10m. Combined, they make 15m progress each second. The answer is 150m/15m/s = 10 seconds
2006-06-19 07:10:52 · answer #5 · answered by Son of a Mitch 6 · 0⤊ 0⤋
caluclating both the speed of the train and the bird it crosses the train by 15m/s so for 150m it goes 150/15 so 10 seconds.
2006-06-19 07:09:00 · answer #6 · answered by Gyanguru 3 · 0⤊ 0⤋
I don't understand this at all, now the bird is on the side of the train flying the train is going north and the bird is going south seems like there is something missing here. Hope he doesn't intersect or he will get squashed.
2006-06-20 06:29:48 · answer #7 · answered by c26nick26 1 · 0⤊ 0⤋
10 seconds i think
because the train is going at ten and the bird is at 5
so for every second, the bird gets closer to the end of the train by 15 meters
2006-06-19 07:14:07 · answer #8 · answered by walkingtoasters 2 · 0⤊ 0⤋
The bird is flying Parallel to the train in the opposite direction. It will never CROSS the train. It will run alongside it but will never cross it.
2006-06-19 07:08:03 · answer #9 · answered by knifelvr 4 · 0⤊ 0⤋
The bird can't cross the train because it is going PARLELL to the train. Read the question before you post it.
2006-06-19 07:28:35 · answer #10 · answered by Hot T-Bone 4 · 0⤊ 0⤋