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  1. Problems
  2. /Mechanics

Mechanics

Physics

Motion, forces, energy, and momentum.

+ Upload a Problem
472 problems
Type:
1.
Answer, and give a reason. Why does a towel soak up water?
High School (11–12) · Surface Tension and CapillarityStemPy LabStemPy Lab
Easy
2.
A clean glass tube of radius 0.40 mm is dipped in water and tilted at 45° to the vertical.
High School (11–12) · Surface Tension and CapillarityStemPy LabStemPy Lab
Medium
3.
A glass tube of radius 0.80 mm is dipped in mercury.
High School (11–12) · Surface Tension and CapillarityStemPy LabStemPy Lab
Medium
4.
A clean glass tube of radius 0.35 mm stands in water.
High School (11–12) · Surface Tension and CapillarityStemPy LabStemPy Lab
Easy
5.
How much work is needed to blow a soap bubble of radius 3.5 cm from a solution of surface tension…
High School (11–12) · Surface Tension and CapillarityStemPy LabStemPy Lab
Medium
6.
Sixty-four drops of water, each of radius 0.50 mm, join to make one big drop.
High School (11–12) · Surface Tension and CapillarityStemPy LabStemPy Lab
Medium
7.
Find the excess pressure inside a soap bubble of radius 1.5 cm in air (S = 0.030 N/m); an air…
High School (11–12) · Surface Tension and CapillarityStemPy LabStemPy Lab
Medium
8.
A soap film is held in a wire frame with one side a movable wire 8.0 cm long.
High School (11–12) · Surface Tension and CapillarityStemPy LabStemPy Lab
Easy
9.
Answer, and give a reason. Why do big hailstones hit the ground much harder than small ones?
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Easy
10.
A drop of drizzle of radius 0.030 mm falls through air of viscosity 1.8 × 10⁻⁵ Pa s.
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Medium
11.
A brass ball of radius 1.2 mm (density 8500 kg/m³) falls through glycerine (density 1260 kg/m³…
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Medium
12.
A flat plate of area 0.15 m² slides at a steady 0.60 m/s over a fixed surface, on a film of oil 1.2…
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Easy
13.
A small plane has wings of total area 25 m².
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Hard
14.
A Venturi meter in a water pipe is 16 cm across at the wide part and 8.0 cm at the throat.
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Medium
15.
A tank on the ground holds water 2.8 m deep.
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Medium
16.
An open tank stands on the ground. A small hole of area 1.5 cm² in its side is 2.5 m below the…
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Easy
17.
Answer, and give a reason. A shower curtain moves inward when the shower is running fast.
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Easy
18.
Show that Bernoulli's equation gives the pressure in a liquid at rest.
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Easy
19.
Water flows at 2.5 m/s at a pressure of 3.2 × 10⁵ Pa in a pipe at ground level.
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Medium
20.
Water flows at 1.5 m/s in a level pipe 12 cm across, at a pressure of 2.0 × 10⁵ Pa.
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Medium
21.
Answer, and give a reason. Why does a river flow fastest where it is narrowest?
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Easy
22.
Blood flows at 0.25 m/s in an artery of radius 0.40 cm.
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Medium
23.
A garden hose 2.0 cm across fills a 12 litre bucket in 20 s.
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Medium
24.
A river 90 m wide and 2.5 m deep flows at 1.4 m/s.
High School (11–12) · Fluid Flow, Bernoulli's Principle and ViscosityStemPy LabStemPy Lab
Easy
25.
Answer, and give a reason. A steel needle sinks, but a steel ship floats.
High School (11–12) · Pressure and FluidsStemPy LabStemPy Lab
Easy
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