Answer:(a)360N,(b)171N,(c)2.702m
Explanation:
(a)Maximum Friction Force =
=360 N
(b)Moment about Ground Point
(c)
Here maximum friction force can be 360 N
Therefore 
Where x is the maximum distance moved by man along the ladder
740x=2000
x=2.702m
Answer:
The drum drill is just one option in stride frequency development. Most of the time, the drum drill can be seen as just a rhythm drill that allows an athlete to relax and experiment with the right range of motion and bounce. A solid background in floating drills and developing reactivity should help athletes mold their stride into a balanced motion that maximizes their speed.
I have used frequency drills for years and now understand the nature of stride development mainly from shaping the stride parameters we all have known about for a long time. The drum drill is a special exercise that can make a great change in athletes who are receptive to improving and with a coach who is worth their salt in instruction. The drum drill is just one option for improving an athlete, and it’s more than fine to use any method you see fit that helps improve stride frequency.
Explanation:
<span>A Doppler radar system transmits radio waves off of objects
and receives what bounces back.
The system measures the difference between the frequency
of the waves it sends and the frequency of the waves it receives.
If the waves come back at a higher frequency than they were sent,
that means the object is moving toward the radar antenna.
If the waves come back at a lower frequency than they were sent,
that means the object is moving away from the radar antenna.
This is kind of what choice-A is trying to say.
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