10. Exercises

Förberedande Mekanik

Version från den 16 september 2009 kl. 16.27; Ian (Diskussion | bidrag)
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Exercise 10.1

A package with mass 300 kg is lifted vertically upwards. Find the tension in the cable which lifts the package, when the package,

a) accelerates upwards at 0.1 \displaystyle \text{m}{{\text{s}}^{-2}},

b) accelerates downwards at 0.2 \displaystyle \text{m}{{\text{s}}^{-2}},

c) travels upwards with a retardation of 0.1 \displaystyle \text{m}{{\text{s}}^{-2}}.

Answer a
Answer 10.1a
Answer b
Answer 10.1b
Answer c
Answer 10.1c
Solution a
Solution 10.1a
Solution b
Solution 10.1b
Solution c
Solution 10.1c

Exercise 10.2

A car of mass 1 tonne travels along a horizontal road and brakes from 50 \displaystyle \text{m}{{\text{s}}^{-1}} to rest in a distance of 300 m. Find the magnitude of the braking force on the car.


Answer
Answer 10.2
Solution
Solution 10.2
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