## Physics Problem Set ### Problem E18 An upward force of \(27.0 \, \text{N}\) is applied via a string to lift a ball with a mass of \(2.3 \, \text{kg}\). 1. **What is the gravitational force acting on the ball?** Enter your answer to 3 significant figures with units. [Text Box for Answer] 2. **What is the total force acting upon the ball?** Enter your answer to 3 significant figures with units and sign. [Text Box for Answer] 3. **What is the acceleration of the ball?** Enter your answer to 3 significant figures with units and sign. [Text Box for Answer] --- ### Problem E19 A \(2.6 \, \text{kg}\) woman in an elevator is accelerating upward at a rate of \(40.0 \, \text{m/s}^2\). 1. **What is the total force acting upon the woman?** Enter your answer to 3 significant figures with units. [Text Box for Answer] 2. **What is the gravitational force acting upon the woman?** Enter your answer to 3 significant figures with units. [Text Box for Answer] 3. **What is the normal force pushing upward on the woman's feet?** (*Note: A picture of the forces on her will help.*) Enter your answer to 3 significant figures with units. [Text Box for Answer] E16. At a given instant in time, a 18.0-kg rock is observed to be falling with an acceleration of 7.2 m/s². What is the magnitude and direction (A positive answer is up; a negative answer is down) of the net force on the rock? Enter your answer to 3SigFigs with units and sign. What is the magnitude and direction of the gravitational force on the rock? Enter your answer to 3SigFigs with units and sign. What is the magnitude of the force of air resistance acting upon the rock at this instant? Enter your answer to 3SigFigs with units and sign. E17. A 1.6-kg book rests on a table. A downward force of 1.0 N is exerted on the top of the book by a hand pushing down on the book. Enter your answer to 3SigFigs with units. What is the total force on the book? What is the magnitude of the gravitational force acting upon the book? Enter your answer to 3SigFigs with units. What is the magnitude of the upward (normal) force exerted by the table on the book? (Is the book accelerated?) Enter your answer to 3SigFigs with units. E18. An upward force of 27.0 N is applied via a string to lift a ball with a mass of 2.3 kg. What is the gravitational force acting on the ball? Enter your answer to 3SigFigs with units. What is the total force acting upon the ball? Enter your answer to 3SigFigs with units and sign.

## Physics Problem Set ### Problem E18 An upward force of \(27.0 \, \text{N}\) is applied via a string to lift a ball with a mass of \(2.3 \, \text{kg}\). 1. What is the gravitational force acting on the ball? Enter your answer to 3 significant figures with units. [Text Box for Answer] 2. What is the total force acting upon the ball? Enter your answer to 3 significant figures with units and sign. [Text Box for Answer] 3. What is the acceleration of the ball? Enter your answer to 3 significant figures with units and sign. [Text Box for Answer] --- ### Problem E19 A \(2.6 \, \text{kg}\) woman in an elevator is accelerating upward at a rate of \(40.0 \, \text{m/s}^2\). 1. What is the total force acting upon the woman? Enter your answer to 3 significant figures with units. [Text Box for Answer] 2. What is the gravitational force acting upon the woman? Enter your answer to 3 significant figures with units. [Text Box for Answer] 3. What is the normal force pushing upward on the woman's feet? (Note: A picture of the forces on her will help.) Enter your answer to 3 significant figures with units. [Text Box for Answer] E16. At a given instant in time, a 18.0-kg rock is observed to be falling with an acceleration of 7.2 m/s². What is the magnitude and direction (A positive answer is up; a negative answer is down) of the net force on the rock? Enter your answer to 3SigFigs with units and sign. What is the magnitude and direction of the gravitational force on the rock? Enter your answer to 3SigFigs with units and sign. What is the magnitude of the force of air resistance acting upon the rock at this instant? Enter your answer to 3SigFigs with units and sign. E17. A 1.6-kg book rests on a table. A downward force of 1.0 N is exerted on the top of the book by a hand pushing down on the book. Enter your answer to 3SigFigs with units. What is the total force on the book? What is the magnitude of the gravitational force acting upon the book? Enter your answer to 3SigFigs with units. What is the magnitude of the upward (normal) force exerted by the table on the book? (Is the book accelerated?) Enter your answer to 3SigFigs with units. E18. An upward force of 27.0 N is applied via a string to lift a ball with a mass of 2.3 kg. What is the gravitational force acting on the ball? Enter your answer to 3SigFigs with units. What is the total force acting upon the ball? Enter your answer to 3SigFigs with units and sign.