Load P = 2.0 lb is produced at the tip of a mallet as a percussionist strikes an instrument. The tip of the mallet is a rubber ball. The wooden shaft has a diameter of 0.27 in. and a length of L = 5.5 in. from the center of the tip to the percussionist’s hand. Assuming the percussionist’s hand acts like a fixed support, determine the maximum bending stress in the shaft.

A 65-lb child and a 162-lb adult are on an oak beam. Determine the magnitude of the largest shear force (consider both positive and negative values) in the beam. Let a = 22 in., b = 49 in., and c = 21 in.

A polymer beam of length L = 75 mm supports a load of P = 2.5 N at its center. The beam has cross-sectional dimensions b = 2.0 mm and h = 7.0 mm. Determine the magnitude of the horizontal shear stress at H, which is located a = 1.4 mm from the top.

A polymer tee beam has cross-sectional dimensions a = 1.7 mm, b = 7.4 mm, c = 2.2 mm, and d = 3.0 mm. The vertical distance from the bottom of the beam to the centroid is 5.3517 mm. Determine the moment of inertia around a horizontal axis located at the centroid.

The figure below shows how normal signaling works with a Ras protein acting downstream of a receptor tyrosine kinase.  For a cell line with a permanently inactive Ras protein, which of the following conditions will turn on this signaling pathway? Indicate Yes or No for each condition. addition of a drug that activates the receptor tyrosine kinase addition of a drug that increases the interaction between protein Y and Ras  addition of a drug that blocks protein Y from interacting with its target addition of a drug that directly activates protein Y

A polymer beam of length L = 79 mm supports a load of P = 2.4 N at its center. The beam has cross-sectional dimensions b = 2.7 mm and h = 8.3 mm. Determine the magnitude of the maximum horizontal shear stress.

A polymer beam of length L = 72 mm supports a load of P = 4.0 N at its center. The beam has cross-sectional dimensions b = 2.0 mm and h = 7.4 mm. Determine the magnitude of the maximum horizontal shear stress.

Load P = 5.5 lb is produced at the nylon tip of a Vic Firth American Classic Jazz 8D drumstick as a percussionist strikes a drumhead. The hickory shaft has a diameter of 0.55 in. and a length of L = 10.3 in. from the center of the tip to the percussionist’s hand. Assuming the percussionist’s hand acts like a fixed support and that the shaft has a constant diameter, determine the magnitude of the maximum horizontal shear stress in the shaft.

A polymer tee beam of length L = 71 mm supports a load of P = 4.3 N at its center and has a web thickness of b = 1.9 mm. The vertical distance from the bottom of the beam to the centroid is c = 4.8594 mm. The moment of inertia around a horizontal axis located at the centroid is 132.06 mm4. Determine the horizontal shear stress at H, which is located a = 3.2 mm above the bottom of the beam.

A polymer beam of length L = 74 mm supports a load of P = 4.7 N at its center. The beam has cross-sectional dimensions b = 2.1 mm and h = 7.8 mm. Determine the magnitude of the horizontal shear stress at H, which is located a = 1.6 mm from the top.