# Question: Imagine that you swing about your head a ball attached

Imagine that you swing about your head a ball attached to the end of a string. The ball moves at a constant speed in a horizontal circle.

(a) Can the string be exactly horizontal? Why or why not?

(b) If the mass of the ball is 0.250 kg, the radius of the circle is 1.50 m, and it takes 1.20 s for the ball to make one revolution, what is the ball’s tangential speed?

(c) What centripetal force are you imparting to the ball via the string?

(a) Can the string be exactly horizontal? Why or why not?

(b) If the mass of the ball is 0.250 kg, the radius of the circle is 1.50 m, and it takes 1.20 s for the ball to make one revolution, what is the ball’s tangential speed?

(c) What centripetal force are you imparting to the ball via the string?

**View Solution:**## Answer to relevant Questions

In Exercise 34, if you supplied a tension force of 12.5 N to the string, what angle would the string make relative to the horizontal? Convert the following angles from radians to degrees: (a) π/6 rad, (b) 5π/12 rad, (c) 3π/4 rad, and (d) π rad. A flywheel rotates with an angular speed of 25 rev/s. As it is brought to rest with a constant acceleration, it turns 50 rev. (a) What is the magnitude of the angular acceleration? (b) How much time does it take to stop? From the known mass and radius of the Moon (see the tables inside the back cover of the book), compute the value of the acceleration due to gravity, gM, at the surface of the Moon. During the Apollo lunar explorations of the late 1960s and early 1970s, the main section of the spaceship remained in orbit about the Moon with one astronaut in it while the other two astronauts descended to the surface in ...Post your question