BASIC BIOMECHANICS
8th Edition
ISBN: 9781259913877
Author: Hall
Publisher: RENT MCG
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Chapter 15, Problem 2IP
A cyclist is riding at a speed of 14 km/hr into a 16 km/hr headwind. What is the wind velocity relative to the cyclist? What is the cyclist’s velocity with respect to the wind? (Answer: 30 km/hr in the direction of the wind; 30 km/hr in the direction of the cyclist)
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Identify the apparent temperature when the air temperature is -25 • F and the winspeed is 20 mph
The “mean-speed theorem” for finding average velocity under constant acceleration, proposed by the Oxford Calculators, and demonstrated geometrically by Nicole Oresme, is expressed algebraically as:
density = weight/volume
(m1)(v1) = (m2)(v2)
(vm) = 1/2 (v0 + vf)
s = (v0)(t) + 1/2 (a)(t2)
velocity = distance/time
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 15 Solutions
BASIC BIOMECHANICS
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Ch. 15 - A cyclist riding against a 12-km/hr headwind has a...Ch. 15 - A swimmer crossing a river proceeds at an absolute...Ch. 15 - Prob. 3APCh. 15 - A scuba diver carries camera equipment in a...Ch. 15 - A 50-kg person with a body volume of 0.055 m3...Ch. 15 - A 670-N swimmer oriented horizontally in...Ch. 15 - Based on your knowledge of the action of fluid...Ch. 15 - Explain the aerodynamic benefits of drafting on a...Ch. 15 - Prob. 9APCh. 15 - Explain why a curveball curves. Include a...
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- The “mean-speed theorem” for calculating average velocity under constant acceleration, developed by Thomas Bradwardine and the Mertonian Calculators at Oxford University, is expressed algebraically as: density = weight/volume (m1)(v1) = (m2)(v2) C. (vm) = 1/2 (v0 + vf) s = (v0)(t) + 1/2 (a)(t2) velocity = distance/timearrow_forwardwhy is the maximum velocity in the michaeli's equation not touching the rectangular hyperbolic curvearrow_forwardAn airplane flying directly eastward at a constant speed travels 293 km in 2.0 h. (a) what is the average velocity of the plane? (b) what is the instantaneous velocity?arrow_forward
- Based on the speculations of Nicole Oresme, and on the equation relating spatial distance, time, initial velocity, and constant acceleration developed by the Mertonian Calculators, how far would you expect a falling object to travel in 5 seconds (falling from a spaceship towards the Earth, in the vacuum of space), starting at 0 feet/second, with constant acceleration (32 feet/sec2), and neglecting possible air friction? 144 feet 256 feet 400 feet 576 feet 784 feetarrow_forwardUsing the Michaelis-Mentan graph pictured (graphing initial velocity and PNPP concentration), identify Vmax and Km as well as possible. Then, using the Lineweaver-Burk graph (graphing 1/Vo and 1 / PNPP concentration), label the reciprocals of Vmax and Km on the graph and use them to calculate Km and Vmax.arrow_forwardWhen Galileo Galilei rolled a ball down an inclined plane, it traveled 2 meters in the first second, and a total of 8 meters in the first two With vo = 0, what was its acceleration on this inclined plane? 0 meter per second2 0 meters per second2 0 meters per second2 0 meters per second2 0 meters per second2arrow_forward
- What is the relationship between Net force, mass and acceleration. Newton’s second law of motion?arrow_forwarda toy car rolls 10 meters (m) across the floor. it takes 5 seconds (s) to cross this distance. what is the speed of this car?arrow_forward1-Using the above “mean-speed theorem”, calculate the average velocity of a car with constant acceleration from 0 km/hour (initial speed) to 90 km/hour (final speed) over a 5 minute period of time. A. average velocity over 5 minutes = 45 kilometers/hour average velocity over 5 minutes = 30 kilometers/hour average velocity over 5 minutes = 18 kilometers/hour average velocity over 5 minutes = 15 kilometers/hour average velocity over 5 minutes = 12 kilometers/hourarrow_forward
- What are the instances in your everyday life where inertia plays a role. Determine whether these are beneficial or harmful effects of inertia. For the harmful effects of inertia, identify ways by which resulting problems are addressed. 1.Beneficial effects of inertia… 2.Harmful effects of inertia… 3.How the problem is or can be solvedarrow_forwardYou have measured the following data for enzyme X. Substrate Vo concentration (micromolar (mM) Isec) 0.05 10 0.1 60 0.5 175 1 250 350 490 10 492 20 494 50 499 100 498 200 498arrow_forwardKepler’s third law can be stated mathematically as: velocity = distance/time (years)2 = (A.U.)3 S = vot + ½ (a) t2 vm = ½ (vo + vf) F = GM1M2/d2arrow_forward
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