Answer:
Explanation:
- w1 = -20 rev/s (clockwise)
I1 = 0.5 x m1 x r1²
= 0.5 x 2 x 0.6²
= 0.36 kg.m²
m2 = 2 kg
r2 = 40 cm = 0.4 m
w2 = 20 rev/s (counter clockwise)
I2 = 0.5 x m2 x r2²
= 0.5 x 2 x 0.4²
= 0.16 kg.m²
let wf be the final angular velocity of the two disks.
Applying conservation of angular momentum ;
(I1 + I2) x wf = I1 x w1 + I2 x w2
wf = (I1 x w1 + I2 x w2) / (I1 + I2)
= (0.36 x (-20) + 0.16 x 20 )/(0.36 + 0.16)
= -7.69rev/s
The negative sign indicates the disks rotate clockwise direction.
This has to do with independent and dependent variables. The independent variable is what affects the dependant variable, so the question is, does a students mark on a test affect their hours of sleep or does their hours of sleep affect their test results? Which one makes more sense? I would say the latter.
Answer:
Granite is an excellent building material that provides some outstanding interior design opportunities whilst being incredibly sturdy and reliable. It has become one of the most popular building materials in modern construction, from kitchen surfaces through to paving slabs.You Can Expect Durability and Longevity. Firstly, marble is so popular around the world because of its durability in a wide variety of weather conditions. Structures that are over hundreds of years old made from marble are still standing to this day, and look as pristine as they day they were crafted.
Explanation:
Answer:
A) The crossbeam is moving relative to the observer on the platform so the height appears contracted.
Explanation:
The observer on the train and the beam are in the same reference frame. That means observer on the train will measure the proper length of the beam not the contracted length . the observer is outside and the plank is in the moving system,it will appear to be moving.
Answer:
Explanation:
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