1. What force is required to punch a hole 50 mm in diameter through a 16-mm-thick aluminum-alloy plate? An average stress of 265 MPa will cause this material to shear.
2. How wide a gap should be allowed between the 50-ft-long paving slabs of concrete in a street so that the slabs will touch each other at a temperature of 90 degrees F? The pavement is laid at a temperature of 65 degrees F. What would be the compressive stress in the slabs if the temperature rose to 110 degrees F? (E for concrete is 3 000 000 psi.)
3. A wire made of copper alloy is 4.5 m long and 1 mm in diameter. It is stretched 14.5 mm by a load of 340 N. What is the modulus of elasticity of this alloy?
4. The total elongation of a square wrought iron bar 50 mm on a side and 3 m long is 1.5 mm. What is the load?
5. Find the total elongation and the stress in a 1-in-diameter AISI 1045 steel rod 12 ft long under a pull of 12 000 lb.

1. A research sub dives to a depth of 6 miles beneath the surface of the ocean. Determine the force exerted by the water on a window of radius 30 cm.
r_saltwater = 1030 kg/m
2. What volume of air at atmospheric pressure is required to fill a 20 liter truck tire to a pressure of 3.0 atm.? Assume constant temperature.

18. the leg and cast in picture (attached) weigh 220N (w1)
Determine the weight w2 and the angle needed so that no force is exerted on the hip joint by the leg plus the cast.
41. The coefficient of static friction between a 3.00 kg crate and the 35.0 degree incline it sits on is 0.300. What minimum force (F) must be appl

Two protons are 2.0 fm apart.
1) What is the magnitude of the electric force on one proton due to the other proton?
2) What is the magnitude of the gravitational force on one proton due to the other proton?
3) What is the ratio of the electric force to the gravitational force?

Using the information in the following table, answer the following questions:
Component Number of people
(millions)
Total population 246
Working-age population 207
Labor force 139
Employed 133
Unemployed 6
- What is the unemployment rate

A force of magnitude 100N is directed N, and a second force of 200N 30 degrees East of North. Find the magnitude and direction of the third force that when added to the first two force gives a resultant where magnitude is zero.

You are pushing a filing cabinet across a rough floor (mk = 0.33) in a straight line at a constant speed. Which of the following statements about the magnitudes of the forces acting on the filing cabinet are correct?
1. true false if you exerted twice the force, the cabinet would accelerate across the floor.
2. true false

A block of mass m=2.0kg is held in equilibrium on an incline of angle=60 degrees by the horizontal force F.
a) determine the value of F
b) determine the normal force exerted by the incline on the block (ignore friction).

9. A force of magnitude 3 units acts at the point with coordinates (1,2,3). The force is applied in the direction of the vector 3i - j + 4k. Find the moment of the force about O. Also find the moment of the force about the point with coordinate (1,2,3)

Please see the attached file for full problem description.
1.) To immobilize a fractured femur, doctors often utilize the Russell traction system illustrated in the figure below. Notice that one force is applied directly to the knee, F1, while two other forces, F2 and F3, are applied to the foot. The latter two forces combine