Since the heights are the same, then the longer ramp.
The mechanical advantage is 8/2 = 4.
5J because 10/2=5
5/20 = 1/4 or 0.25
1/5 = 0.2
Zero: the ramp cannot be shorter than the height to which it is suppose to reach. I suspect there is a missing decimal point.
The ideal mechanical advantage of the bar is 5.
It may be good in some cases. A high mechanical advantage comes at a cost - you need to apply less force, but you need to apply it over a greater distance.
6
Mechanical advantage is maximum when weight lifted is extremly high and for which C/W is extremely small so as to be negleted, Max. Mechanical Advantage=1/m
It's 1. IMA = Distance in / Distance out. A single pulley doesn't do anything toward mechanical advantage, it changes the direction of the force. Not always. A single-axeled pulley (the typical pulley) has an IMA of 1, having one axel. If there was a second axel, then the IMA would = 2, so on and so forth. The easy way to do it is IMA = # of axels.
The mechanical advantage is 8/2 = 4.
3.3 ft
5J because 10/2=5
5/20 = 1/4 or 0.25
204 inches
1/5 = 0.2
they have high name recognition, can take advantage of government research staffs and information, and have greater access to the media.