It’s doesn’t change meaning it’s 0
Answer:
(a) the blocks all had different masses.
Explanation:
The surface is smooth, therefore coefficient of friction is tending to zero.
Forces for each blocks varied from 6N to 8N to 7N to 5N
The blocks were made of different materials and different materials are going to have varying weight for the same size of block.
Answer:
is the minimum gap between the slabs
Explanation:
Given:
- length of the concrete highway,
- coefficient of thermal expansion,
- range of temperature variation,
<u>Now form the equation of thermal expansion:</u>
Since each slab of the highway expands by the above length so the minimum gap between the slabs to prevent buckling:
is the minimum gap between the slabs
Answer:
366 m
Explanation:
u = 90 km/h = 25 m/s,
theta = 5 degree
acceleration, a = g Sin theta = 9.8 x Sin 5 = 0.854 m/s^2
The final velocity os zero and let the braking distance be s.
Use third equation of motion
v^2 = u^2 - 2 a s
0 = 25 x 25 - 2 x 0.854 x s
s = 366 m
