EBK BASIC BIOMECHANICS
7th Edition
ISBN: 9780100409453
Author: Hall
Publisher: YUZU
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Chapter 11, Problem 5AP
Explain how the velocity of the ball in Problem 4 would differ if the stick were swung at a 30° angle to the direction of motion of the horse.
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When Galileo Galilei rolled a ball down an inclined plane, it traveled 1.0 meters in the first second, and a total of 4.0 meters in the first two seconds. What was its acceleration on this inclined plane?
2.0 meters per second2
3.0 meters per second2
4.0 meters per second2
5.0 meters per second2
6.0 meters per second2
2. a) Label the system provided below, including the reference frame, moment arms and vector forces
with the information provided.
Internal moment arm = 4cm +0.04m
External moment arm relative
to the segment weight = 25cm 0.25m
External moment arm relative
to the load weight = 45cm 40.45m
Segment weight = 50 N
Load weight = 100 N
Lower leg segment angle relative
to horizontal plane = 45°
Quadriceps tendon angle = 45°
Axis of
rotation
MF
SW
LW
2b) Using the figure in 2a., calculate the external torque of the system relative to the normal
component of segment and load weights listed above.
2c) Calculate the amount of both the tangential component of the muscle force and the muscle force
itself required to keep this system in a state of static equilibrium.
Give two example of 'curvature' movement?
Chapter 11 Solutions
EBK BASIC BIOMECHANICS
Ch. 11 - The relative angle at the knee changes from 0 to...Ch. 11 - Identify the angular displacement, the angular...Ch. 11 - How many revolutions are completed by a top...Ch. 11 - A kickers extended leg is swung for 0.4 s in a...Ch. 11 - The angular velocity of a runners thigh changes...Ch. 11 - A tennis racquet swung with an angular velocity of...Ch. 11 - A 1.2-m golf club is swung in a planar motion by a...Ch. 11 - David is fighting Goliath. If Davids 0.75-m sling...Ch. 11 - A baseball is struck by a bat 46 cm from the axis...Ch. 11 - A polo players arm and stick form a 2.5-m rigid...
Ch. 11 - Explain how the velocity of the ball in Problem 4...Ch. 11 - A majorette in the Rose Bowl Parade tosses a baton...Ch. 11 - A cyclist enters a curve of 30-m radius at a speed...Ch. 11 - A hammer is being accelerated at 15 rad/s2. Given...Ch. 11 - A speed skater increases her speed from 10 m/s to...
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- The adjacent diagram displays the joint reaction force between the acetabulum and femoral head for the right leg during single leg stance. Also shown are the abductor muscle force (AMF), the weight of the body above the level of the stance hip (W) and their corresponding moment arms with respect to the joint centre (D and D1). If the right leg weighs 1/6 of total body weight, the ratio of D1 to D is 2.4, and AMF is angled at 30 degrees relative to the vertical, calculate the: Abductor muscle force (2 marks). Hip joint reaction force (2 marks). Express both answers as multiples of total body weightarrow_forwardBased on the attached figure (Figure 16.15 in the textbook), how is galloping different from walking in this cat model? (A) Swing Stance- Е3 F E₁ Е2 Ез F LH RH LF RF Flexion- Extension Flexors (B) Walk LH LF RHO RF Trot LH LF RH Extensors (C) Extensors Flexors Stance Swing Pace LH LF RHO RF Gallop LH LF RH RF - (D) Reciprocal inhibition (V1, V2b) Time Flexor module E/R CE Flexor M muscles E/R Extensor module O Excitatory neuron (E) Inhibitatory neuron (I) Oa-Motor neuron (M) rla-INS (V1, V2b) M Extensor muscles Level of transection of spinal cord a) In walking, intervals for lifting each leg are longer than in galloping. O b) In walking, each leg is lifted in a specific sequential order, whereas in galloping the two hind legs are synchronized to be lifted at the same time followed by the front legs. O c) In walking, the interval at which each leg is moving is different, whereas in galloping thearrow_forwardGIVE 3 EXERCISES THAT CAN BE CONSIDERED AS A LOCOMOTOR MOVEMENT WITH ABDUCTION AND ADDUCTION MOVEMENT. WHY?arrow_forward
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