Acceleration is a constant at anytime A car is hauling a 100 kg trailer, to whic
ID: 1485371 • Letter: A
Question
Acceleration is a constant at anytime A car is hauling a 100 kg trailer, to which n is connected by a spring. The spring constant is 3000 N/m. the car accelerates with acceleration of 0.30m/s^2. By how much docs the spring stretch? A car weighing 2 kg runs into another car has 10 kg. The first was moving at 20 m/s and the second was at test. If first car has 4 m/s speed to the opposite direction after the collision, what is the speed of the- second car after the collision? 10) What is not true about the output sound wave when two waves are in phase.Explanation / Answer
(8) m = 100 kg, k=3000 N/m, a = 0.30m/s2
Force produced by the car F = ma = 100 * 0.30 = 30 N
stretch in the spring produced : x = F/k = 30/3000 = 0.01 m
------------------------------------------------------------------------------------------------------------------------------------------
(9) applying conservation of momentum
m1u1 + m2u2 = m1v1 + m2v2
setting m1=2kg, u1=20m/s, m2=10kg, u2=0, v1=-4m/s, v2=unknown
(2) (20) + (10) (0) = (2) (-4) + (10) v2
v2 = 4.8 m/s
-------------------------------------------------------------------------------------------------------------------------------------------
(10) part (d) is not true.
------------------------------------------------------------------------------------------------------------------------------------------