2006-09-19 20:29:45 · 4 answers · asked by bulldawg771 1 in Science & Mathematics ➔ Physics
Assume all quantities going up as positive. Summation of vertical forces on the system (car) should result into an acceleration of 0.80 m/s^2.
+ Tension - Weight = (mass car) (acc car)
Tension is positive because it is going up. Weight is negative because it is going down.
+Tension - 1200 (9.8) = 1200 (+0.80)
0.80 is positive because it is going up.
So you can now compute for tension.
2006-09-19 20:51:39 · answer #1 · answered by dax 3 · 1⤊ 0⤋
The force that the rope must withstand are cause of two forces.
1. the force produce by accelerating it upward
2. the weight of the car.
T = m (a+g)
= 1200kg(.8+9.81m/s^2)
T = 12732 N
2006-09-20 05:39:24 · answer #2 · answered by dexterblueice 2 · 1⤊ 0⤋
The net force is 1200*0.8 = 960 Newton upwards.
The gravity os 9.8*1200=11760 Newton downwards.
Since net force = tension+gravity (in this case tension-gravity because the dierctions are opposite), the tension is 960+11760=12740 N.
2006-09-20 04:12:09 · answer #3 · answered by helene_thygesen 4 · 1⤊ 0⤋
Use f = ma again.
but this time the force (f) on the left side will have two forces.
the force of gravity and the force from tension
2006-09-20 03:39:05 · answer #4 · answered by Demiurge42 7 · 0⤊ 0⤋