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anonymous
 one year ago
A radar is able to detect the reflected waves from an enemy airplane,after a time interval of 0.02 milliseconds.If the velocity of the waves is 3 x 10 ms^1, calculate the distance of the plane from the radar.
anonymous
 one year ago
A radar is able to detect the reflected waves from an enemy airplane,after a time interval of 0.02 milliseconds.If the velocity of the waves is 3 x 10 ms^1, calculate the distance of the plane from the radar.

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beginnersmind
 one year ago
Best ResponseYou've already chosen the best response.0Assuming constant velocity what's the relation between distance traveled, velocity and time? If you get the distance traveled don't forget that the wave has to travel from the radar to the airplane _and back_.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.03*10^8 = 2d/0.02 3*10^8 = 200d/2 3*10^8 = 100d

beginnersmind
 one year ago
Best ResponseYou've already chosen the best response.0Time was given in milliseconds, not seconds. You gotta convert first.

beginnersmind
 one year ago
Best ResponseYou've already chosen the best response.0BTW, what does d mean in your expression? The distance the wave travels or the distance between the radar and the airplane?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I'll get back to this question later,Can you help me with another question?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0A crowbar of length 1.2 m has its fulcrum at a distance of 0.2 m from the load.Calculate the mechanical advantage of the crowbar.

beginnersmind
 one year ago
Best ResponseYou've already chosen the best response.0Sorry, can't help, I don't know the exact definition of mechanical advantage.dw:1441489130768:dw But I guess that's what they mean. The force F on the LHS has the same torque as the force 5F on the right hand side.

beginnersmind
 one year ago
Best ResponseYou've already chosen the best response.0Basically the lever arm is 5 times as long on the left as on the right, so in a sense the force is "magnified" by a factor of 5.
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