NAPT - Navy Advanced Programs Mechanical Comprehension and Physics Questions and Answers

Question 1

A hydraulic lift is used to raise a 2,000 kg vehicle.
The input piston has a surface area of 5 cm², and the output piston supporting the vehicle has a surface area of 500 cm².
What is the minimum force that must be applied to the input piston to lift the vehicle? (Use g ≈ 10 m/s²)

Accepted Answer

200 N

Answer

100 N

Answer

1,000 N

Answer

20,000 N

Question 2

Three gears are arranged in a line. Gear A has 10 teeth and drives Gear B, which has 20 teeth. Gear B then drives Gear C, which has 5 teeth. If Gear A rotates clockwise at 100 RPM, what is the rotational speed and direction of Gear C?

Accepted Answer

200 RPM, clockwise

Answer

50 RPM, counter-clockwise

Answer

200 RPM, counter-clockwise

Answer

50 RPM, clockwise

Question 3

A block is at rest on an inclined plane. Which of the following forces is responsible for preventing the block from sliding down the plane?

Accepted Answer

Static friction

Answer

Normal force

Answer

Gravitational force

Answer

Kinetic friction

Question 4

A sailor uses a single fixed pulley system to lift a 150 N load of supplies. Assuming the system is ideal (no friction), what is the minimum effort force the sailor must apply to lift the load?

Accepted Answer

150 N

Answer

75 N

Answer

100 N

Answer

300 N

Question 5

Which of the following physical principles best explains why a ship made of steel can float on water?

Accepted Answer

Archimedes' Principle

Answer

Pascal's Principle

Answer

Bernoulli's Principle

Answer

Newton's Third Law

Question 6

An object is dropped from a great height. As it falls, its velocity increases until it reaches a constant speed, known as terminal velocity. At this point, which statement is true?

Accepted Answer

The force of air resistance equals the force of gravity.

Answer

The force of gravity on the object is zero.

Answer

The object's acceleration is at its maximum.

Answer

The buoyant force on the object is at its maximum.

A hydraulic lift is used to raise a 2,000 kg vehicle.The input piston has a surface area of 5 cm², and the output piston supporting the vehicle has a surface area of 500 cm².What is the minimum force that must be applied to the input piston to lift the vehicle? (Use g ≈ 10 m/s²)

A hydraulic lift is used to raise a 2,000 kg vehicle.
The input piston has a surface area of 5 cm², and the output piston supporting the vehicle has a surface area of 500 cm².
What is the minimum force that must be applied to the input piston to lift the vehicle? (Use g ≈ 10 m/s²)