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4. A 76 k pesor is How fast is person gojng sidim down a hll of 50°, Mk a fter 2,0seconds? ma- ffn - fax :と 5. a=6. after2.0s= 464 - Ng sina So3-7.5

4. A 76 k pesor is How fast is person gojng sidim down a hll of 50°, Mk a fter 2,0seconds? ma- ffn - fax :と 5. a=6. after2.0s= 464 - Ng sina So3-7.5

College Physics
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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**Chapter 5 - Physics Problems** **1. Piano Problem** - A piano with a mass of 80 kg is pushed along flat ground. - Coefficient of kinetic friction (μk): 0.2 - Coefficient of static friction (μs): 0.4 **Questions:** - a. What does the piano weigh? - **Answer:** 784 N - b. What force is needed to get it to move? - **Answer:** 312.2 N - c. What force is needed to keep it moving at a constant velocity? - **Answer:** 156.8 N - d. What force is needed to apply in order to accelerate it at 5 m/s²? - **Answer:** 578.8 N **2. Box on Concrete Ground** - A 120 kg box is on the concrete ground. The workers pull at a combined force of 800 N parallel to the ground. - Coefficient of kinetic friction (μk): 0.8 - Coefficient of static friction (μs): 0.5 **Question:** Can the workers move the box? Why? - **Answer:** No, they need a force of 940.8 N to get it moving. **3. Object on Inclined Plane** - An object with mass of 65 kg lies on an inclined plane at 25° to horizontal. - A force is applied parallel to the plane at 35 N. The object accelerates at 2.5 m/s². **Question:** What is μk between the object and the plane? (Work on scrap paper) - **Calculation:** μk = 0.31 **4. Person Sliding Down a Hill** - A 76 kg person is sliding down a hill of 50°. - Coefficient of kinetic friction (μk): 0.1 **Question:** How fast is the person going after 2.0 seconds? - **Calculation:** a = 7.5 m/s² - **Answer:** 72.6 m/s (after corrections) **Diagram Insight:** The diagram illustrates the forces acting on the person sliding down the hill, showing components such as gravitational force (mg) and normal force (FN). **5. Truck on a Hill** - Calculate the perpendicular
Transcribed Image Text:**Chapter 5 - Physics Problems** **1. Piano Problem** - A piano with a mass of 80 kg is pushed along flat ground. - Coefficient of kinetic friction (μk): 0.2 - Coefficient of static friction (μs): 0.4 **Questions:** - a. What does the piano weigh? - **Answer:** 784 N - b. What force is needed to get it to move? - **Answer:** 312.2 N - c. What force is needed to keep it moving at a constant velocity? - **Answer:** 156.8 N - d. What force is needed to apply in order to accelerate it at 5 m/s²? - **Answer:** 578.8 N **2. Box on Concrete Ground** - A 120 kg box is on the concrete ground. The workers pull at a combined force of 800 N parallel to the ground. - Coefficient of kinetic friction (μk): 0.8 - Coefficient of static friction (μs): 0.5 **Question:** Can the workers move the box? Why? - **Answer:** No, they need a force of 940.8 N to get it moving. **3. Object on Inclined Plane** - An object with mass of 65 kg lies on an inclined plane at 25° to horizontal. - A force is applied parallel to the plane at 35 N. The object accelerates at 2.5 m/s². **Question:** What is μk between the object and the plane? (Work on scrap paper) - **Calculation:** μk = 0.31 **4. Person Sliding Down a Hill** - A 76 kg person is sliding down a hill of 50°. - Coefficient of kinetic friction (μk): 0.1 **Question:** How fast is the person going after 2.0 seconds? - **Calculation:** a = 7.5 m/s² - **Answer:** 72.6 m/s (after corrections) **Diagram Insight:** The diagram illustrates the forces acting on the person sliding down the hill, showing components such as gravitational force (mg) and normal force (FN). **5. Truck on a Hill** - Calculate the perpendicular
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