Question

1. An object of mass M is moves in an x,y plane according the equations below. The parameters A, B, and C are positive constants. We are considering its motion for negative and positive values of t. x equals A t y equals B t minus C t squared Which of the following are true?

The speed of the object at t=0 is zero.

The acceleration of the object is negative C.

The speed of the object at t=0 is square root of A squared plus B squared end root.

The speed of the object is constant.

The velocity of the object is constant.

The acceleration of the object is negative 2 C.

The speed of the object at t=0 is A

2.

2.An object is connected to a rigid rod which causes it to move in a vertical circular path of radius R at constant speed V. The object has mass M with weight equal to Mg . Which of the following are true?

\The net force on the object is MV2.

The acceleration of the object is zero

. The net force on the object is MVR.

The net force on the object is MV2/R.

The object has a tangential acceleration.

The net force on the object is MV/R.

There are no forces acting on the object.

The object has a centripetal acceleration.

There at times when the rod exerts a tangential force on the object.

The net force on the object is zero.

Answer #1

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