It pulls the moon toward earth
0
Explanation:
A wall on which an amount of force is acted upon and does not move suggests that no work has been done on the wall.
Work done is the force applied on a body to move it through a particular distance in the direction of the force.
For work to be done:
- Force must be applied to a body or on it
- Distance must be moved in the direction of the applied force
Work done = force x distance moved.
Given parameters:
force = 20N
distance = 0
Work done = 20 x 0 = 0J
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The normal radius of the trachea does not change so you can view R as a constant as well.
Find v ' and solve v ' = 0.
v ' = k(R-r)(2r) + k(-1)(r^2)
v ' = 2rk(R-r) + -kr^2
v ' = 2rkR - 2kr^2 - kr^2
v ' = 2rkR - 3kr^2
Set v ' = 0 and solve for r.
0 = 2rkR - 3kr^2
0 = rk(2R - 3r)
rk = 0 or 2R - 3r = 0
r = 0 or 2R = 3r
r = 0 or r = 2R/3
Plug 0 and 2R/3 for the orginal v and the larger value is the maximum.
If r = 0, then v = k(R - 0)(0^2) = 0
If r = 2R/3, then v = k(R - 2R/3)(2R/3)^2
v = k(R/3)(4R^2 / 9)
v = 4kR^3 / 27
<span>Therefore, the radius of 2R/3 will produce the maximum air velocity of 4kR^3 / 27.</span>
Answer:
Explanation:
There are four phases of work out that includes Skills, Stamina, Strength and power.
While performing phase 4 workout which is Power, resistance plays an important role. At this time one needs to push themselves harder and instead of long workout, you should go harder with short burst at maximum power.
8-12 repetitions of resistance training exercises for each group of muscle and an intensity of 40 % to 80% of single repetition is required and should be performed while doing phase 4 workout.