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My wife is getting stuck on something she thinks is probably a simple step. So any help would be appreciated. There is four questions
1) A Boeing 747 "Jumbo Jet" has a length of 59.7m. The runway on which the plane lands intersects another runway. The width of the intersection is 25.0 m. The plane decelerates through the intersection at a rate of 5.70 m/s squared ( I can't type the 2 above the "s") and clears it with a final speed of 45.0 m/s. How much time is needed for the plane to clear the intersection?
2) A cement block accidentally falls from rest from the ledge of a 53.0-m-high building. When the block is 14.0 m above the ground, a man, 2.00 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have to get out of the way?
3) In 1954 the English runner Roger Bannister broke the four minute barrier for the mile with a time of 3:59.4 s (3 min and 59.4s). In 1999 the Moroccan runner Hicham el-Guerrouj set a record of 3:43.13 s for the mile. If these two runner had run in in the same race, each running the entire race at the average speed that earned him a place in the record books, el-Guerrouj would have won. By how many meters?
4) In 1998, NASA launched Deep Space 1 (DS-1), a spacecraft that successfully flew by the asteroid named 1992 KD (which orbits the sun millions of miles from earth). The propulsion system of the DS-1 worked by ejecting high-speed argon ions out the rear of the engine. The engine slowly increase the velocity of DS-1 by about +9.0 m/s per day. (a) How much time (in days) would it take to increase the velocity of DS-1 by +2700 m/s? (b) What was the eccelration fo DS-1 (in m/s squared)?
1) A Boeing 747 "Jumbo Jet" has a length of 59.7m. The runway on which the plane lands intersects another runway. The width of the intersection is 25.0 m. The plane decelerates through the intersection at a rate of 5.70 m/s squared ( I can't type the 2 above the "s") and clears it with a final speed of 45.0 m/s. How much time is needed for the plane to clear the intersection?
2) A cement block accidentally falls from rest from the ledge of a 53.0-m-high building. When the block is 14.0 m above the ground, a man, 2.00 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have to get out of the way?
3) In 1954 the English runner Roger Bannister broke the four minute barrier for the mile with a time of 3:59.4 s (3 min and 59.4s). In 1999 the Moroccan runner Hicham el-Guerrouj set a record of 3:43.13 s for the mile. If these two runner had run in in the same race, each running the entire race at the average speed that earned him a place in the record books, el-Guerrouj would have won. By how many meters?
4) In 1998, NASA launched Deep Space 1 (DS-1), a spacecraft that successfully flew by the asteroid named 1992 KD (which orbits the sun millions of miles from earth). The propulsion system of the DS-1 worked by ejecting high-speed argon ions out the rear of the engine. The engine slowly increase the velocity of DS-1 by about +9.0 m/s per day. (a) How much time (in days) would it take to increase the velocity of DS-1 by +2700 m/s? (b) What was the eccelration fo DS-1 (in m/s squared)?
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