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A muscle contraction becomes less efficient as the speed of shortening increases.

You are working with an orthopedic surgeon, and they ask you to help model how much force the knee extensor muscles exert on the lower leg (shank) as it moves through the swing phase of the gait cycle. Assume the upper leg (femur) is in contact with the shank during this phase of the gait cycle. Draw a free body diagram on your scratch paper of this problem, and upload it at the end after you have submitted your exam.

Now that you have completed the exam, you will now submit your exam. You will then return to the Midterm 1 Module in Canvas for today, and upload a scanned version of all your handwritten work. You will have 10 minutes after your submission time to upload a scanned version of any written work for partial credit considerations. No partial credit can be provided for any problem in which the work is illegible or not clearly numbered, or if any pages are missing. Your exam submission time will be stamped in Canvas and will be used for cross-reference. Thank you.

Consider vectors -2i + 12j – 17k and 14i – 1j + 4k. Calculate: a.) the dot product. b.) the cross product. c.) the angle between the two vectors.

The magnitude of contractile (active) force in skeletal muscle is directly proportional to the number of cross-bridges formed.

Muscle force varies with muscle length.

Particle‐mediated or “gene gun” technology has been developed as a nonviral method for gene transfer into various mammalian tissues. Gene delivery is achieved by physical force that launches DNA‐coated gold particles towards targeted cells. Consider a gold particle that is launched at an angle of 25° to the horizontal with an initial resultant velocity of 25 m/sec. Find both the vertical and horizontal components of the initial velocity vector. Clearly label your answer for the vertical and horizontal components in the text box below.

At the longest muscle lengths, most of the force measured in the muscle is due to crossbridge connection.

The dust storms that devastated the plains resulted from all of the following EXCEPT …

Given angle α = 55°, opposite side = 4 m in a right triangle, find the hypotenuse and adjacent side lengths.