(A) When in a circle, the arc length is equal to its --------; the angular displ
ID: 1997150 • Letter: #
Question
(A) When in a circle, the arc length is equal to its --------; the angular displacement is one radian.
(a) diameter (b) radius (c) circumference
(B) Speed of an object in a circular motion will be -------, if is increasing (counterclockwise).
a) Positive b)Negative
(C) When a rigid object rotates about a fixed axis, every portion of that object has the same ----- -----, and the same -----------.
a) angular speed; angular acceleration b) tangential speed; tangential acceleration
(D) The direction of velocity of an object, moving in a circle is continuously changing.
True/ False
(E) An object traveling in a circle, even though it moves with a constant speed, will always have acceleration. True False
(F) The direction of centripetal acceleration is always directed toward the center of the circle of motion. True False
(G) What force provides centripetal acceleration to a ball attached to a string, rotating in a circular path at constant speed?
(a) Inertia of the ball (b) Tension in the string (c) air resistance
(H) If the angular acceleration and the angular velocity of a mass moving in a circle, are in opposite directions, the angular speed will -------- with time.
(a) Increase (b) decrease
(I) Centrifugal force on an object in a circular motion, is because of the -------------.
(a) Inertia of the object (b) Tension in the string (c) air resistance
Explanation / Answer
A)
arc length = angle * radius
arc length = radius
the correct option is b) radius
B)
is increasing
speed of object in a circular motion = negative
C)
When a rigid object rotates about a fixed axis, every portion of that object has the same a) angular speed; angular acceleration
D)
as the velocity is always changing
this is TRUE
E)
An object traveling in a circle, even though it moves with a constant speed, will always have acceleration.
this is true , as the direction is always changing
please post the rest in a seperate question
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