Initially, a small 2.0-kg rock is whirling at the end of a very thin string in a circular path of radius 0.75 m on a horizontal frictionless surface, as shown in the figure. The initial tangential speed of
The rock was 5.0 m/s. The string has been slowly winding around a vertical rod, and a few seconds
Later the length of the string has shortened to 0.25 m. What is the instantaneous speed of the mass at
The moment the string reaches a length of 0.25 m?

A) 3.9 m/s
B) 225 m/s
C) 15 m/s
D) 75 m/s
E) 9.3 m/s

Question

Initially, a small 2.0-kg rock is whirling at the end of a very thin string in a circular path of radius 0.75 m on a horizontal frictionless surface, as shown in the figure. The initial tangential speed of
The rock was 5.0 m/s. The string has been slowly winding around a vertical rod, and a few seconds
Later the length of the string has shortened to 0.25 m. What is the instantaneous speed of the mass at
The moment the string reaches a length of 0.25 m?

A) 3.9 m/s 
B) 225 m/s 
C) 15 m/s 
D) 75 m/s 
E) 9.3 m/s

Quizplus · Accepted Answer

The Answer of Initially, a small 2.0-kg rock is whirling at the end of a very thin string in a circular path of radius 0.75 m on a horizontal frictionless surface, as shown in the figure. The initial tangential speed of
The rock was 5.0 m/s. The string has been slowly winding around a vertical rod, and a few seconds
Later the length of the string has shortened to 0.25 m. What is the instantaneous speed of the mass at
The moment the string reaches a length of 0.25 m?

A) 3.9 m/s 
B) 225 m/s 
C) 15 m/s 
D) 75 m/s 
E) 9.3 m/s

Initially, a Small 2