1.A freight train has a mass of 1.3 ? 10 7 kg. If the locomotive can exert a con
ID: 1278856 • Letter: 1
Question
1.A freight train has a mass of 1.3 ? 107 kg. If the locomotive can exert a constant pull of 6.5 ? 105 N, how long does it take to increase the speed of the train from rest to 62 km/h?
2.A 907-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 20.0 m/s. What is the average force exerted on the car during this time?
a.) Find the acceleration of the 2 objects and the tension in the string.
a=__________m/s2 T= ____________N
b.) Use the value from the part A to help you work this exercise. What if an additional mass is attached to the ball? How large must this mass be to increase the downward acceleration by 30%?
Consider the figure below. Find the tension in each cable supporting the 572-N cat burglar. (Assume the angle 6 of the inclined cable is 32.0 degree ) inclined cable Suppose the horizontal cable were reattached higher up on the wall. Would the tension in the inclined cable increase, decrease, or stay the same?Explanation / Answer
1.
apply F = ma
so accleration a = 8,3e5/1.7e7
a = 0.0488 m/s^2
use V = u +at
use 1kmph = 5/18 m/s
t = (64*5/18)-0/0.0488
t = 364.298 secs
t = 6.07 mins
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2.
2. accleration a = V/t = 20/5 = 4 m/s^2
so force F = ma = 907 * 4 = 3628 N
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