Which is never true for a Newton 3rd law force pair? a.The forces are equal in m

Question

Which is never true for a Newton 3rd law force pair?

a.The forces are equal in magnitude.

Which of the following force types can provide a continuous centripetal force for uniform circular motion? Select all correct answers.

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Question 32 pts

Which of the following statements regarding non-inertial reference frames is not true?

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Question 43 pts

Viewed from the north pole, the earth rotates counter-clockwise. If the earth were to rotate at the same magnitude angular velocity but in the opposite direction, i.e. clockwise, how would our experience of weight force, "effective g", change?
Recall
"effective g" 9.80 m/s2
in contrast to g that is calculated for a nonrotating earth
"real g" 9.82 m/s2

The orbit of the international space station is about 3.8 x 105 m. The radius of earth is about 6.37 x 106 m. Why do the astronauts appear to float in this photograph?

Question 63 pts

An object in a fixed circular path has a nonzero tangential acceleration.
Which statement is true about the centripetal force?

aFor clarity, consider the direction within an x-y plane.



Note: Like all coordinate systems, the r-t-z coordinate system is only subject to Newton's laws when you analyze from a non-inertial reference frame. If you were to consider the reference frame of the moving object you would not have a centripetal force, you would have instead a centrifugal force. Your coordinate system is moving with your object while your reference frame is at rest in the x-y plane.

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Question 73 pts

For which string is the tension different on both ends of a string?

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Question 83 pts

I pull a massless rope with 45 N of force; the force the rope pulls on my hand is 45 N.
For which of the following cases is tension in the rope the greatest?

a.The forces are equal in magnitude.

Explanation / Answer

(1) ans - b , as forces are equal and opposite but acts on different bodies . Action on one body and reaction on another body.

(2) ans a,b,c,d all are correct .

For Uniform circular motion we need a force constant in magnitude but changing in direction . All these force can be used as centripetal force.

(3) ans. C in earth frame Newton's law are applicable.

(4) ans. C.

If earth rotates in clockwise with same angular speed then also the centrifugal force will be same and resultant g will be same .

So g effective will remain same

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