It's a concept of direct and inverse variation.
Answers
Answer:
Nuclear reactions such as those that create heavy elements also create vast numbers of ghostly subatomic bits known as neutrinos. These belong to a group of particles called leptons, such as the familiar electron and the muon and tau particles. Because neutrinos barely interact with ordinary matter, they can allow a direct look into the heart of a star. This works only if we are able to capture and study them, something physicists are just now learning to do.
Step-by-step explanation:
Nuclear reactions such as those that create heavy elements also create vast numbers of ghostly subatomic bits known as neutrinos. These belong to a group of particles called leptons, such as the familiar electron and the muon and tau particles. Because neutrinos barely interact with ordinary matter, they can allow a direct look into the heart of a star. This works only if we are able to capture and study them, something physicists are just now learning to do.
Answer:
7. length of the bridge is 110m
8. it would take 18 seconds for the train to cross the platform
Step-by-step explanation:
7. convert km/hr to m/s: 72×5/18=20m/s
now you have number of metres covered in a second.
Multiple it with the given time: 20m/s×13s=260m
subtract this length with the length of the train: 260-150=110m.
110m is the length of the bridge
8. convert km/hr to m/s: 50×5/18=13.9m/s
add the length of the train and platform: 120+130=250m.
divide the total length by the calculated m/s: 250m÷13.9m/s= 17.98s or 18s
note: 5/18 is a conversion value used to convert km/h to m/s, while 18/5 is used to convert m/s to km/h