What is the gauge pressure due to water at a depth of 2 m? (density 1000 kg/m^3, g = 10 m/s^2)
Answer and explanation
Correct answer: D. 20000 Pa
- Step 1: The pressure of a liquid column is p = rho g h.
- Step 2: p = 1000 x 10 x 2 = 20000 Pa.
Answer
20000 Pa.
Why not the others: The gravitational field strength is needed; leaving out g or the density gives the smaller values, and an extra factor 10 the larger one.
Practise more Mechanics.
Free questions with an explanation for every one, and full timed Bagrut (Secondary School Matriculation) mock tests.
More Mechanics questions
- An object moves with initial speed 4 m/s and constant acceleration 4 m/s^2. How far does it travel in 4 s?
- A frictionless slide is 20 m high. A child starts from rest at the top. Taking g = 10 m/s^2, what is the child's speed at the bottom?
- A 2 kg cart moving at 9 m/s hits a 1 kg cart at rest and the two stick together. What is their common speed afterwards?
- A car drives around a circular curve of radius 4 m at 8 m/s. What is its centripetal acceleration?
- A car starts at 5 m/s and accelerates uniformly at 5 m/s^2 for 4 s. What is its final speed?
- An object moves with initial speed 10 m/s and constant acceleration 6 m/s^2. How far does it travel in 5 s?