math

A ball rolls along a circle whose radius is 2 ft. How far does the ball roll if it goes around the circle 12.5 times?

I got 25 ft as my answer. I just multiplied the two numbers and I got 25. Is this right?

1. 👍
2. 👎
3. 👁
1. Nope. The distance around the circle is PI*4.

PI*4*12.5= ? way over 25. Way over 100, but not over 200

1. 👍
2. 👎
👤
bobpursley
2. Oops. I assume the ball is rolling around the circumference of the circle, not the radius.

To find the circumference of the circle, use this formula, in which C = circumference, r = radius, and pi - 3.14

C = 2r * pi
C = 4 * 3.14
C = ?

Now multiply 12.5 by the circumference.

If you post your answer we'll check it. You can also study about the circumference at this site.

http://www.mathgoodies.com/lessons/vol2/circumference.html

1. 👍
2. 👎
👤
Ms. Sue
3. is it 157.1?

1. 👍
2. 👎
4. I got 157 feet.

1. 👍
2. 👎
👤
Ms. Sue
5. how did you get that?

1. 👍
2. 👎
6. Using Bobpursley's formula of PI*4*12.5 =
3.14 * 4 * 12.5 = 157

1. 👍
2. 👎
👤
Ms. Sue

Similar Questions

1. chemistry

The kinetic energy of a rolling billiard ball is given by KE=1/2mv2. Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial speed of 4.7m/s . As it travels, it loses some of its energy as heat. The ball slows

2. physics

A steel ball rolls with constant velocity across a tabletop 0.950m high. IT rolls off and hits the ground +0.352m horizontally from the edge of the table. How fast was the ball rolling?

3. Physics

A conical pendulum is formed by attaching a ball of mass m to a string of length L, then allowing the ball to move in a horizontal circle of radius r. 1. Find an expression for the tension T in the string. (Express your answer in

4. Physics

A ball rolls down a hill with a constant acceleration of 2.0 m/s2. If the ball starts from rest, (a) what is its velocity and the end of 4.0 s? (b) How far did the ball move?

1. Physics

A child twirling a 0.0120kg ball on a string in a horizontal circle parallel to the floor. The radius of this circle is 0.358m. The ball traveling once around the circle is 2.08 seconds. a)Determine the centripetal force acting on

2. physics

a ball of weight 200 grams,is tied to the end of a cord and whirled in a horizontal circle of radius 0.6 m.if the ball makes five complete revolutions in 2 seconds,what will be the linear speed of the ball?

3. physics help!

A small 520-gram ball on the end of a thin, light rod is rotated in a horizontal circle of radius 1.5 m. Calculate the moment of inertia of the ball about the center of the circle. Then calculate the torque needed to keep the ball

4. physics

A solid ball of mass m and radius r rolls without slipping through a loop of radius R, as shown in the figure. From what height h should the ball be launched in order to make it through the loop without falling off the track? (Use

1. Physics

In a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. In one instance, the radius of the circle is 0.608 m. At

2. Physics

A 300 ball swings in a vertical circle at the end of a 1.2-m-long string. When the ball is at the bottom of the circle, the tension in the string is 13 . What is the speed of the ball at that point?

3. Physics

An athlete swings a 3.46 kg ball horizontally on the end of a rope. The ball moves in a circle of radius 0.55 m at an angular speed of 0.35 rev/s. What is the tangential speed of the ball?

4. Physics

A child is twirling a 0.0120-kg plastic ball on a string in a horizontal circle whose radius is 0.100 m. The ball travels once around the circle in 0.500 s. (a) Determine the centripetal force acting on the ball. (b) If the speed