NAPT - Navy Advanced Programs Problem Solving and Application Questions and Answers

Question 1

A submarine is operating at a depth of 200 meters in seawater.
Assuming the density of seawater is approximately 1025 kg/m³ and the acceleration due to gravity (g) is 10 m/s², what is the gauge pressure exerted on the submarine's hull?

Accepted Answer

2,050,000 Pa

Answer

2,050 Pa

Answer

20,500,000 Pa

Answer

20,500 Pa

Question 2

A piece of electronic equipment on a naval ship is rated to operate at 120 V and draws a current of 2.5 A. How much power does this equipment consume during operation?

Accepted Answer

300 W

Answer

48 W

Answer

0.021 W

Answer

122.5 W

Question 3

A ship's diesel engine takes in 8,000 kJ of heat from fuel combustion and rejects 5,000 kJ of waste heat to the seawater coolant system during one cycle. What is the thermal efficiency of this engine?

Accepted Answer

37.5%

Answer

62.5%

Answer

160%

Answer

40%

Question 4

A technician needs to prepare a 500 mL cleaning solution with a 2.0 Molar (M) concentration of sodium hydroxide (NaOH). Given that the molar mass of NaOH is 40.0 g/mol, what mass of NaOH is required?

Accepted Answer

40.0 g

Answer

20.0 g

Answer

80.0 g

Answer

100.0 g

Question 5

In a nuclear fission reaction within a reactor, 5.0 x 10⁻¹² kg of mass is converted directly into energy. Using Einstein's mass-energy equivalence principle (E=mc²), calculate the amount of energy released. (Use c ≈ 3.0 x 10⁸ m/s).

Accepted Answer

4.5 x 10⁵ J

Answer

1.5 x 10⁻³ J

Answer

1.67 x 10⁻²⁰ J

Answer

4.5 x 10⁴ J

Question 6

A winch on a ship's deck lifts a 500 kg crate of supplies from the pier to a height of 20 meters in 40 seconds. What is the average power output of the winch, ignoring friction? (Use g ≈ 10 m/s²).

Accepted Answer

2,500 W

Answer

100,000 W

Answer

400,000 W

Answer

1,250 W

A submarine is operating at a depth of 200 meters in seawater.Assuming the density of seawater is approximately 1025 kg/m³ and the acceleration due to gravity (g) is 10 m/s², what is the gauge pressure exerted on the submarine's hull?

A submarine is operating at a depth of 200 meters in seawater.
Assuming the density of seawater is approximately 1025 kg/m³ and the acceleration due to gravity (g) is 10 m/s², what is the gauge pressure exerted on the submarine's hull?