https://proteus.physics.ndsu.nodak.edu/adm/randomlabel.png?he bead slides starti

Question

https://proteus.physics.ndsu.nodak.edu/adm/randomlabel.png?he bead slides starting from rest at position C on the frictionless wire. The direction of the gravitational field is in the -y direction (toward the bottom of the page).

The acceleration at B is zero.
The velocity at H equals the velocity at B.
The acceleration in the y-direction at D is ... zero.
The speed at B is ... the speed at H.
The acceleration in the x-direction at D is ... zero.
The speed at B is ... the speed at A.

Explanation / Answer

The acceleration at B is zero. is False The velocity at H equals the velocity at B. The acceleration in the y-direction at D is Greater than zero. The speed at B is Greater than the speed at H. The acceleration in the x-direction at D is zero. The speed at B is Equal to the speed at A. may consider the following a) less than bcause for acceleration at C > you need to consider one just forward point and just backward point v (forward) = v(final) = less than =v (backward) = v(initial) acceleration (along +x) = -ve = v(final - v(initial)/time or less than zero particle approaches (C) at top speed from left >>then speed falls as it rises ================ F) The velocity at A equals the velocity at B. (TRUE/FALSE) speed at A = speed B because both entail same altitude (PE) when PE's are same >> then KE's are same >> square of velocity in KE>> only clear sppeds being same ======== for v(A) = V(B) >> vectors > veocities tangents at A and B must also point in the same direction v(B)= |v| (i) unit vector in +x direction v(B)= |v| [(i) + j] >> [x,y] plane so F) is false

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