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B.Tech Robotics Statics and Torque — practice questions — page 2

Explore 33 free Statics and Torque questions in B.Tech Robotics Mechanics. Open each question or exercise to read its content, reference answers and available explanation.

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Statics and Torque questions and exercises with answers

Showing questions 31–33 of 33.

Why do skeletal muscles such as the biceps and the triceps occur in opposing pairs?Read the answer and worked solution →In the arm, what does the triceps muscle do?Read the answer and worked solution →A biceps muscle exerts 470 N to hold a forearm and a book whose combined weight is 63.7 N. What is the ratio of muscle force to weight supported?Read the answer and worked solution →

Worked practice questions

Why do skeletal muscles such as the biceps and the triceps occur in opposing pairs?

  1. Because each muscle can only expand
  2. Because each pair shares one tendon
  3. Because paired muscles halve the load
  4. Because each muscle can only contract
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Correct answer: D. Because each muscle can only contract

1. A muscle can pull but cannot push, since it can only contract. 2. One muscle is therefore needed to close a limb and a second to open it again. 3. That is why skeletal muscles are arranged in opposing pairs across a joint. 4. Halving the load is not the reason, since the two muscles of a pair rarely act at once. _Source: OpenStax College Physics (CC BY 4.0), Ch 9 "Statics and Torque", section 9.6 Forces and Torques in Muscles and Joints_

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In the arm, what does the triceps muscle do?

  1. It extends the limb, opening it out
  2. It flexes the limb, closing it up
  3. It rotates the limb about its long axis
  4. It locks the elbow joint in one place
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Correct answer: A. It extends the limb, opening it out

1. In the arm the biceps is a flexor, which closes the limb. 2. The triceps is the opposing muscle, an extensor that opens the limb. 3. This flexor and extensor pairing is typical of skeletal muscles in vertebrates. 4. Flexing the limb is the job of the biceps, so that option names the wrong muscle. _Source: OpenStax College Physics (CC BY 4.0), Ch 9 "Statics and Torque", section 9.6 Forces and Torques in Muscles and Joints_

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A biceps muscle exerts 470 N to hold a forearm and a book whose combined weight is 63.7 N. What is the ratio of muscle force to weight supported?

  1. 7.38
  2. 0.136
  3. 6.38
  4. 1.14
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Correct answer: A. 7.38

1. The ratio wanted is the muscle force divided by the weight it supports. 2. Substituting, 470 N / 63.7 N = 7.38. 3. The muscle therefore pulls with more than seven times the weight it holds up. 4. This large factor follows from the mechanical advantage of the arm being far below one. 5. The value 6.38 is the corresponding ratio for the elbow joint force, not the muscle force. _Source: OpenStax College Physics (CC BY 4.0), Ch 9 "Statics and Torque", section 9.6 Forces and Torques in Muscles and Joints_

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