What is the magnitude of the work done stopping the car?


Posted January 21st, 2010 by admin 2 Comments »
car
TmanBaller7 asked:


A car and driver weighing 7330 N passes a sign stating “Bridge Out 29.8 m Ahead.” She slams on the brakes, and the car decelerates at a constant rate of 14.9 m/s2 .
The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the work done stopping the car if the car just stops in time to avoid diving into the water?
Answer in units of J.

What is the required force to pull a shopping car?


Posted October 25th, 2009 by admin 3 Comments »
car
JerichoX asked:


A woman pulls a shopping car with a force F at an angle of 35. The car mass is 20kg and its friction coefficient is 0.05. Find:
(A) The force the woman needs to apply to move the car with a constant velocity of 1m/s.
(B) The magnitude of the normal force and friction when the car moves at constant velocity.
(C) The force the woman needs to exert to push the car with a constant velocity of 1/s.
(D) The Displacement if the car is pushed 5 seconds and the displacement if the car is pulled 5 seconds.