The next 3 questions use the following information: When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.50 kg. If the biceps is connected to the forearm a distance dbiceps = 3.00 cm from the elbow, how much force Fbiceps must the biceps exert to hold a 1.00 kg ball at the end of the forearm at a distance dpall = 34.0 cm from the elbow, with the forearm parallel to the floor? How much force Felbow must the elbow exert? 5. In the figure at right, which one of the following choices of pivot point would lead to a torque equation in which the only unknown quantity is the magnitude of the force exerted by the biceps? Friceps A C Felbow doiceps forearm dpll Whall 6. The forearm should be modeled as a) a rigid rod moving with constant acceleration. b) a flexible rod in equilibrium. c) a flexible rod moving with constant acceleration. d) a particle in equilibrium. e) a rigid rod in equilibrium. 7. What is the horizontal distance dforearm between the elbow and the point where the weight of the forearm acts? а) 0 cm b) 3.00 cm c) 17.0 cm d) 20.0 cm e) 34.0 cm
The next 3 questions use the following information: When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.50 kg. If the biceps is connected to the forearm a distance dbiceps = 3.00 cm from the elbow, how much force Fbiceps must the biceps exert to hold a 1.00 kg ball at the end of the forearm at a distance dpall = 34.0 cm from the elbow, with the forearm parallel to the floor? How much force Felbow must the elbow exert? 5. In the figure at right, which one of the following choices of pivot point would lead to a torque equation in which the only unknown quantity is the magnitude of the force exerted by the biceps? Friceps A C Felbow doiceps forearm dpll Whall 6. The forearm should be modeled as a) a rigid rod moving with constant acceleration. b) a flexible rod in equilibrium. c) a flexible rod moving with constant acceleration. d) a particle in equilibrium. e) a rigid rod in equilibrium. 7. What is the horizontal distance dforearm between the elbow and the point where the weight of the forearm acts? а) 0 cm b) 3.00 cm c) 17.0 cm d) 20.0 cm e) 34.0 cm
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Transcribed Image Text:The next 3 questions use the following information:
When you lift an object by moving only your forearm, the main lifting muscle in your arm is the
biceps. Suppose the mass of a forearm is 1.50 kg. If the biceps is connected to the forearm a distance
dbiceps = 3.00 cm from the elbow, how much force Fbiceps must the biceps exert to hold a 1.00 kg
ball at the end of the forearm at a distance dpall = 34.0 cm from the elbow, with the forearm parallel
to the floor? How much force Felbow must the elbow exert?
5. In the figure at right, which one of the following choices
of pivot point would lead to a torque equation in which
the only unknown quantity is the magnitude of the force
exerted by the biceps?
Fhiceps
A
D
Far
а) А
b) В
с) С
d) D
elbow
dpiceps
Wforearm
dpall
Whall
6. The forearm should be modeled as
a) a rigid rod moving with constant acceleration.
b) a flexible rod in equilibrium.
c) a flexible rod moving with constant acceleration.
d) a particle in equilibrium.
e) a rigid rod in equilibrium.
7. What is the horizontal distance dforearm between the elbow and the point where the weight of the
forearm acts?
a) 0 cm
b) 3.00 cm
c) 17.0 cm
d) 20.0 cm
e) 34.0 cm
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