# Practice Problems 7 (without answers) - Physics Honors...

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Physics Honors Chapter 7 Worksheet A child is playing with a toy comprised of a massless 85-cm string attached to a small 0.04-kg ball. The child swings the ball in a vertical circle so that the period of the ball's rotation is 1.3 seconds. 1. What is the speed of the ball? 2. What is the tension in the string when the ball is at the bottom of the circle and moving sideways? 3. What is the tension in the string when the ball is at the top of the circle and moving sideways? A child is playing with a toy comprised of a massless 85-cm string attached to a small 0.04-kg ball. The child swings the ball in a horizontal circle so that the period of the ball's rotation is 1.3 seconds. The string makes an angle to the horizontal as the ball orbits the child’s hand. 4. What is the magnitude of the vertical component of the tension force? 5. Show that the angle the string makes with the horizontal is given by 1 2 2 sin 4 gT L where g is the gravitational acceleration, T is the period of the ball’s motion, and L is the length of the string. 6. What angle does the string make with the horizontal? 7. What is the radius of the ball’s motion? 8. What is the speed of the ball? 9. What is the horizontal component of the tension force? 10. What is the tension in the string? An astronaut child is playing with a toy comprised of a massless spring attached to a small 0.04-kg ball in zero gravity. The child swings the ball in a horizontal circle so that the period of the ball's rotation is 1.3 seconds and the

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