Laura asks…
What does Backward skating – stepping forward in both directions mean?
Part of the NISA Level 6 syllabus states that the figure skater must be able to do “Backward skating – stepping forward in both directions“.
What does this mean exactly? Should the glide be on one foot simply backwards in a straight line, or can it be on an outside edge backwards?
Nagesh answers:
The skill has to be done on a curve using edges, not a straight line, which would use “‘flats.”
Use a hockey circle to skate backwards and hold the back outside edge for at least 2x your height.
Turn your head to look over your outside shoulder and let your shoulders rotate to the rear.
Step down on a forward outside edge between your hands.
Hold for at least 2x your height.
Do this in both directions: RBO=>LFO and LBO=>RFO
Chris asks…
Two parallel wires carry identical currents in opposite directions, what happens to the two wires ?
Two parallel wires carry identical currents in opposite directions . Can someone please explain , with detailed reasoning , what happens to the two wires?
Nagesh answers:
The two wires are attracted to eachother.
A flowing electric current will create a magnetic field proportional to the current.
By amperes law, the magnetic field (which circles around the wire in a direction determined by the right hand rule), is
B = (mu)*i/2(pi)r
where r is the distance to where the magnetic field is being measured,
(mu) = 4 pi E-7 T*m/A
i = current.
It is know that a magnetic field can exert a force on another magnetic field. Opposites attract, two of the same charges repel. Even if you do not know what the force is, you can assume that it is proportional to B. Since the two currents are in oppossite directions, their magnetic fields are opposite, so the charge of the magnetic fields are opposite. By that reasoning alone you can conclude that they should attract one another.
Just so you know, for a magnetic field, the force on a length of wire is
F= i*L x B
where i is current, L is the length of the wire, B is the magnetic field, and x represents the cross product of the length vector and the magnetic field vector.
If the wires are perpendicular this reduces to
F = iLB.
The two forces will be equal but opposisite so they will be pulling on eachother, bringing the wires together.
See http://hyperphysics.phy-astr.gsu.edu/Hbase/magnetic/forwir2.html for a picture of how the right hand rule works for current and magnetic field
Robert asks…
Is it safe to bake chicken that only has deep fry directions?
I bought a huge box of chicken tenders at Sam’s Club and didn’t think to look at the directions first. The only directions are for deep frying. Is it safe to bake them as long as they reach the right temperature?
Nagesh answers:
Sure. Chicken tenders can be prepared several different ways. The directions on the box are just a suggestion of how to do it.
Here’s a excellent recipe if you want them like chicken nuggets with breading:
http://allrecipes.com/Recipe/Baked-Chicken-Nuggets/Detail.aspx
My favorite way of making them is in my George Forement grilling machine, then I add them to a stir fry or casserole.
Betty asks…
How soon after 2o’clock will the hands of a clock extend in opposite directions?
How soon after 2o’clock will the hands of a clock extend in opposite directions?
I have no idea how to solve clock problems so show solutions pretty please. Thanks in advanced 🙂
Nagesh answers:
At 2:00, the hour hand is 60° ahead of the minute hand. By the time the hands point in opposite directions, the minute hand will have passed the hour hand, so the angle between them will be -180°.
The minute hand advances 6° per minute and the hour hand advances 0.5° per minute.
After t minutes the angle between hands is 60 – 6t + 0.5t.
-180 = 60 – 6t + 0.5t
5.5t = 240
t = 43.6363…
The hands will be opposite at 43.6363… Minutes after 2:00
Sandra asks…
What is the use of directions in vector analysis?
What is the use of directions in vector analysis?
Why is there a need for direction in vector analysis?
Nagesh answers:
What’s the need for direction?
Because different directions for a vector produces different results.
Example: Two identical cars moving at a speed of 50 m/s are a distance of 1 km apart. The two cars are moving on the same road and same lane. What’s going to be the result of this situation if:
a) They are moving in opposite directions
b) They are moving in the same direction.
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