I only need help with 4,6,7 A 2000-kg truck moving at 30 m/s hits an initially u
ID: 1452609 • Letter: I
Question
I only need help with 4,6,7 A 2000-kg truck moving at 30 m/s hits an initially uncompressed horizontal with spring constant (force constant) of 20 x 106 N/m. What is the maxim spring compresses? In a ballistics test, a 30-g bullet pierces a sand bag that is 35 cm thick. If the initial bullet velocity was 55 m/s and it emerged from the sandbag moving at 20 m/s. what was the magnitude of the friction force (assuming it to be constant) that the bullet experienced while it traveled through the bag' A rubber ball and a lump of clay have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit The clay sticks to the wall. Which one of these objects the greater momentum change? Both of them experience the same non-zero momentum change Both of them experience zero momentum change.Explanation / Answer
4) m =10 kg , x =3 cm
From Hooks law
F =kx =mg
k*0.03 =10*9.8
Spring constant k =3266.7 N/m
6) m =30g , s =35 cm , u =55 m/s, v =20 m/s
Form kinematic equaiton
v^2 -u^2 =2as = 2a
(20*20) -(55*55) = 2a*0.35
a =-3750 m/s^2
Fk = ma = 0.03*3750 = 112.5 N
7) for rubber ball change in momentum = mv +mv = 2mv
for lump clay chaneg in momenutum = 0+mv = mv
Correct option is (A)