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The distance an object falls, from rest, in gravity is
D = (1/2) (G) (T²)
'T' is the number seconds it falls.
In this problem,
0.92 meter = (1/2) (9.8) (T²)
Divide each side by 4.9 : 0.92 / 4.9 = T²
Take the square root
of each side: √(0.92/4.9) = T
0.433 sec = T
The horizontal speed doesn't make a bit of difference in
how long it takes to reach the floor. BUT ... if you want to
know how far from the table the pencil lands, you can find
that with the horizontal speed.
The pencil is in the air for 0.433 second.
In that time, it travels
(0.433s) x (1.4 m/s) = 0.606 meter
from the edge of the table.
Explanation:
<u>We</u><u> </u><u>call</u><u> </u><u>the</u><u> </u><u>magnitude</u><u> </u><u>of</u><u> </u><u>the</u><u> </u><u>charge of </u><u>an</u><u> </u><u>electron</u><u> </u><u>as</u><u> </u><u>ELEMENTARY</u><u> </u><u>CHARGE</u><u>.</u>
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<span>a=Δω/Δt
</span><span>a=2π*Δf/Δt
</span><span>a=2π*(f2-f1)/Δt
</span>
<span>f1=f2-a*Δt/2π
</span><span>f2=800/60 rev/sec
</span><span>a=-42 rad/sec^2
</span><span>Δt=1.75sec
</span><span>so
f1=25 rev/sec
f1=1500 rev/min</span>
Answer:
Hydro jetting
Explanation:
Hydro jetting:
Hydro jetting is incredibly efficient: High water pressure is incredibly effective in clearing clogged sewers and keeping a clean sewer line. Even a powerful enough jet of water will strip roots from the tree.