A car weighing 12,000N12,000N is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with incompressible oil with a density 800 kg/m^3800kg/m 3 and capped at both ends with tight-fitting pistons. The car rests on the piston on the wider arm of the U-tube that has a radius of 18.0cm18.0cm, and the narrower arm has a radius of 5.00cm5.00cm. The pistons are initially at the same level. The pistons are initially at the same level. What is the initial force that must be applied to the smaller piston in order to start lifting the car

A force of magnitude F applied to the smaller piston exerts a pressure of

P = F / (π (0.0500 m)²)

while the 12 kN car exerts the same pressure at the other piston of

P = (12,000 N) / (π (0.180 m)²)

Solve for F :

F / (π (0.0500 m)²) = (12,000 N) / (π (0.180 m)²)

F = (12,000 N) (0.0500 m)² / (0.180 m)²

F = 925.926 N ≈ 930 N

Then a minimum force of 930 N must be applied in order to start lifting the car.

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

1 a

2 b

3 b

4 d

5 d

6 d

explanation: