1- Moment of inertia describes an objects ability to resist bending. The moment

Question

1- Moment of inertia describes an objects ability to resist bending. The moment of inertia for a rectangular beam is represented by the formula

I=bh3/12 where:

I ? moment of interia
b ? base width
h ? height

If the beam's base width is 90 mm and the height is 315 mm, what is the beam's moment of inertia in inches4?

2- Pressure is a measure of force per unit area or

P=F/A. A student is checking the amount of pressure their car exerts upon the road. The car weighs 2 tons ( US short ton ). The student finds the dimensions of each tire's footprint on the road is 12.5 cm X 16.5 cm. In pounds per square inch (psi), what is the total pressure the car exerts upon the road?

3- The Des Plaines River Bridge is 2.1 km long. Engineers are considering re-lighting the bridge with a pole placed every

105 feet of the bridge length starting from the south end. Each pole will support four light globes. How many globes will be required for the re-lighting project?

4-n 2003 at Holloman Air Force Base in New Mexico, test engineers set a world record by moving 192 lb payload at 6,453 miles per hour in a rocket sled. The rocket sled track, built in 1954, is 15.44 km in length. Assume the sled moved at the maximum speed for the entire length of the track, how long (in seconds) would it take for the sled to reach the end of the track?

Explanation / Answer

inertia = 110 x 383^3 /12.......mm^4 one inch = 25.3 mm so, inertia = (110 x 383^3 / 12) x ( 1/25.3^4).......inch^4.....................

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