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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I need question 5 answered.
Transcribed Image Text:### Physics Problems: Friction and Force
**1. Piano Movement on Flat Ground**
- **Object**: 80 kg piano
- **Coefficients of friction**: Kinetic (μ_k) = 0.2, Static (μ_s) = 0.4
a. **Weight of Piano**:
- Answer: 784 N
b. **Force to Start Movement**:
- Answer: 312 N
c. **Force for Constant Velocity**:
- Answer: 156.8 N
d. **Force for Acceleration (5 m/s²)**:
- Answer: 278.8 N
**2. Box on Concrete Ground**
- **Object**: 120 kg box
- **Force applied**: 800 N
- **Coefficients of friction**: Kinetic (μ_k) = 0.8, Static (μ_s) = 0.5
- **Question**: Can the workers move the box?
- Answer: No, they need a force of 940.8 N to begin moving the box.
**3. Object on Inclined Plane**
- **Mass**: 65 kg
- **Incline angle**: 25°
- **Force applied**: 35 N
- **Acceleration**: 2.5 m/s²
- **Question**: What is the kinetic friction (μ_k) between the object and the plane?
- Answer: μ_k = 0.31
**4. Person Sliding Down Hill**
- **Mass**: 76 kg
- **Incline angle**: 50°
- **Coefficient of friction**: μ_k = 0.1
- **Question**: Speed after 2 seconds?
- Answer: 72.6 m/s²
**5. Truck on Hill**
- **Weight of truck**: 700,000 N
- **Incline angle**: 50°
- **Task**: Calculate the perpendicular force component.
- Answer: 449,645.1 N
**Diagram Explanation (Problem 4)**
- **Inclined Plane Diagram**: A triangle representing the slope, with forces depicted:
- mgsinθ (down the slope)
- mgcosθ (perpendicular to the slope)
- Friction (opposing the
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