Please solve 4A and 4B **Transcription of Physics Problems on Power and Non-Conservation**1. **What power is required of the engine of a 1600 kg car traveling at a constant 25.1 m/s on a level road if the forces of resistance total 703 N?** **Answer:** 17.6 kW2. **A 75 g frisbee is thrown from a point 1.1 m above the ground with a speed of 12 m/s. When it has reached a height of 2.1 m, its speed is 10.5 m/s.** a) How much work was done on the frisbee by its weight? b) How much of the frisbee's energy was dissipated by air drag? **Answers:** a) -0.74 J b) 0.53 J3. **A moving 2.5 kg block collides with a horizontal spring whose spring constant is 320 N/m. The block compresses the spring a maximum distance of 7.5 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.25.** a) How much work is done by the spring in bringing the block to rest? b) How much mechanical energy is dissipated by the force of friction while the block is being brought to rest by the spring? c) What was the speed of the block when it hit the spring? **Answers:** a) -0.90 J b) 0.46 J c) 1.0 m/s4. **For this problem, try to use only energy considerations in your solution. You are asked to design a net for firefighters that will catch a 25 kg person jumping from the top of a 30-story building.** a) What will the person's approximate speed be when hitting the net? b) How much kinetic energy will the net have to convert into other forms of energy? **Note:** 1 story = 3.3 m. **Answers:** a) 44.1 m/s b) 24 280 J---**Diagrams/Graphs Explanation:** There are no diagrams or graphs associated with these problems. Each problem is focused on the application of physics concepts such as energy balance, friction, and motion.

Potential Energy of the person = Kinetic energy of the person as hits the netmgh = 12mv2gh = v22v…

4. For this problem, try to use only energy considerations in your solution. You are asked to design a net for firefight- ers that will catch a 25 kg person jumping from the top of a 30-story building. a) What will the person's approximate speed be when hitting the net? b) How much kinetic energy will the net have to convert into other forms of energy? Note: 1 story = 3.3 m. %3D Inswers: a) 44.1 m/s b) 24 280 J

4. For this problem, try to use only energy considerations in your solution. You are asked to design a net for firefight- ers that will catch a 25 kg person jumping from the top of a 30-story building. a) What will the person's approximate speed be when hitting the net? b) How much kinetic energy will the net have to convert into other forms of energy? Note: 1 story = 3.3 m. %3D Inswers: a) 44.1 m/s b) 24 280 J

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

Please solve 4A and 4B

**Transcription of Physics Problems on Power and Non-Conservation**

1. **What power is required of the engine of a 1600 kg car traveling at a constant 25.1 m/s on a level road if the forces of resistance total 703 N?**

**Answer:** 17.6 kW

2. **A 75 g frisbee is thrown from a point 1.1 m above the ground with a speed of 12 m/s. When it has reached a height of 2.1 m, its speed is 10.5 m/s.**

a) How much work was done on the frisbee by its weight?

b) How much of the frisbee's energy was dissipated by air drag?

**Answers:** a) -0.74 J b) 0.53 J

3. **A moving 2.5 kg block collides with a horizontal spring whose spring constant is 320 N/m. The block compresses the spring a maximum distance of 7.5 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.25.**

a) How much work is done by the spring in bringing the block to rest?

b) How much mechanical energy is dissipated by the force of friction while the block is being brought to rest by the spring?

c) What was the speed of the block when it hit the spring?

**Answers:** a) -0.90 J b) 0.46 J c) 1.0 m/s

4. **For this problem, try to use only energy considerations in your solution. You are asked to design a net for firefighters that will catch a 25 kg person jumping from the top of a 30-story building.**

a) What will the person's approximate speed be when hitting the net?

b) How much kinetic energy will the net have to convert into other forms of energy?

**Note:** 1 story = 3.3 m.

**Answers:** a) 44.1 m/s b) 24 280 J

---

**Diagrams/Graphs Explanation:** There are no diagrams or graphs associated with these problems. Each problem is focused on the application of physics concepts such as energy balance, friction, and motion.

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