9. Exercises
From Mechanics
(Difference between revisions)
Line 30: | Line 30: | ||
</div>{{#NAVCONTENT:Answer|Answer 9.3|Solution|Solution 9.3}} | </div>{{#NAVCONTENT:Answer|Answer 9.3|Solution|Solution 9.3}} | ||
+ | |||
+ | |||
+ | ===Exercise 9.4=== | ||
+ | <div class="ovning"> | ||
+ | |||
+ | A block, of mass 4 kg, is being dragged across a rough horizontal surface at a constant velocity by a force of 20 N acting parallel to the surface. Find the coefficient of friction between the object and the surface. | ||
+ | |||
+ | </div>{{#NAVCONTENT:Answer|Answer 9.4|Solution|Solution 9.4}} |
Revision as of 15:29, 14 September 2009
Theory | Exercises |
Exercise 9.1
A parachutist is falling vertically at a constant speed. He has mass 80 kg. Find the magnitude of the upward force acting on the parachute.
Answer
Solution
Exercise 9.2
Answer a
Answer b
Answer c
Solution a
Solution b
Solution c
Exercise 9.3
A bicycle moves with a constant velocity along a straight horizontal road. If the forward force which the cyclist exerts by pedalling is 28 N, what is the magnitude of the resistive force acting on the bicycle and cyclist ?
Answer
Solution
Exercise 9.4
A block, of mass 4 kg, is being dragged across a rough horizontal surface at a constant velocity by a force of 20 N acting parallel to the surface. Find the coefficient of friction between the object and the surface.
Answer
Solution