Questions from College Physics

Q: Assume that if the shear stress in steel exceeds about 4.

Assume that if the shear stress in steel exceeds about 4.00 x 108 N/m2, the steel ruptures. Determine the shearing force necessary to (a) Shear a steel bolt 1.00 cm in diameter and (b) Punch a 1.00-cm...

Q: Two spheres, one hollow and one solid, are rotating with

Two spheres, one hollow and one solid, are rotating with the same angular speed around an axis through their centers. Both spheres have the same mass and radius. Which sphere, if either, has the highe...

Q: A man opens a 1.00-m wide door by

A man opens a 1.00-m wide door by pushing on it with a force of 50.0 N directed perpendicular to its surface. What magnitude of torque does he apply about an axis through the hinges if the force is ap...

Q: Bone has a Young’s modulus of 18 x 109 Pa. Under

Bone has a Young’s modulus of 18 x 109 Pa. Under compression, it can withstand a stress of about 160 x 106 Pa before breaking. Assume that a femur (thigh bone) is 0.50 m long, and calculate the amount...

Q: A stainless-steel orthodontic wire is applied to a tooth,

A stainless-steel orthodontic wire is applied to a tooth, as in Figure P9.72. The wire has an unstretched length of 3.1 cm and a radius of 0.11 mm. If the wire is stretched 0.10 mm, find the magnitude...

Q: A high-speed lifting mechanism supports an 800. -kg

A high-speed lifting mechanism supports an 800. -kg object with a steel cable that is 25.0 m long and 4.00 cm2 in cross-sectional area. (a) Determine the elongation of the cable. (b) By what additiona...

Q: The deepest point in the ocean is in the Mariana Trench,

The deepest point in the ocean is in the Mariana Trench, about 11 km deep. The pressure at the ocean floor is huge, about 1.13 x 108 N/m2. (a) Calculate the change in volume of 1.00 m3 of water carrie...

Q: Determine the elongation of the rod in Figure P9.75 if

Determine the elongation of the rod in Figure P9.75 if it is under a tension of 5.8 x 103 N. Figure P9.75:

Q: The total cross-sectional area of the load-bearing calcified

The total cross-sectional area of the load-bearing calcified portion of the two forearm bones (radius and ulna) is approximately 2.4 cm2. During a car crash, the forearm is slammed against the dashboa...

Q: An iron block of volume 0.20 m3 is suspended from

An iron block of volume 0.20 m3 is suspended from a spring scale and immersed in a flask of water. Then the iron block is removed, and an aluminum block of the same volume replaces it. (a) In which ca...