BASIC BIOMECHANICS
8th Edition
ISBN: 9781259913877
Author: Hall
Publisher: RENT MCG
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Chapter 3, Problem 6IP
A gymnastics floor mat weighing 220 N has dimensions of 3 m × 4 m × 0.04 m How much pressure is exerted by the mat against the floor?
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A spring has a constant of 875 N/m. What hanging-mass will cause this spring to stretch 4.5 m?
Direction: Convert the following. Show your computation/solution.
1. 9 inches to cm
2. 5 feet 5 inches to cm
3. 5 feet 9 inches to meter
4. 99 kg to lbs
5. 120 lbs to kg
A scientist was investigating if differences in the frictional work performed on a model car can change
depending on its mass (in grams) and whether the car moves up or down an inclined plane. They decided to
measure the amount of frictional force experienced by the model car and the distance it traveled in meters.
The scientists were able to evaluate the frictional work using the following data.
Mass (g)
Distance (m) Force
Work Done by Friction (J)
car going up the incline
100
39
0.063
2.457
car going down the incline 70
39
0.2309 ?
It is known that the relationship between force and distance determines the work done by friction (W+).
W₁ = fd
Wf work done by friction
f = force
d = distance
Question:
How much work done by friction was exerted on the car as it moved down the inclined plane?
You may use a calculator.
1
2.457
9.005
11.46
16.16
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Chapter 3 Solutions
BASIC BIOMECHANICS
Ch. 3 - Prob. 1IPCh. 3 - How much force must be applied to a 0.5-kg hockey...Ch. 3 - A rugby player is contacted simultaneously by...Ch. 3 - Prob. 4IPCh. 3 - Draw the horizontal and vertical components of the...Ch. 3 - A gymnastics floor mat weighing 220 N has...Ch. 3 - What is the volume of a milk crate with sides of...Ch. 3 - Prob. 8IPCh. 3 - If the contents of the crate described in Problem...Ch. 3 - Two children sit on opposite sides of a playground...
Ch. 3 - Prob. 1APCh. 3 - Gravitational force on planet X is 40% of that...Ch. 3 - A football player is contacted by two tacklers...Ch. 3 - A 75-kg skydiver in free fall is subjected to a...Ch. 3 - Use a trigonometric solution to find the magnitude...Ch. 3 - Prob. 6APCh. 3 - In the nucleus pulposus of an intervertebral disc,...Ch. 3 - Prob. 9APCh. 3 - Two muscles develop tension simultaneously on...
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