They use sound waves that bounce off walls, and other things back to them to feel where they are going.
Answer:
The answer will be 1.344 cents
Explanation:
100 W = 0.1 kW
the kWh =Power(W) x Time(Hour)
0.1 kW x 24 hours = 0.24 kWh
0.24 kWh x 5.6 cents per kWh = 1.344 cents
Answer:
Explanation:
To measure increase in length due to thermal expansion, the formula is
L₂ =L₁ ( 1 + α t ) where L₁ length increases to L₁ due to rise in temperature by t.
L₂ in both the case is same so
for aluminium
L₂ = 2.8 ( 1 + 23 X 10⁻⁶ t )
for steel
L₂ = 2.804 ( 1 + 12 X 10⁻⁶ t )
2.8 ( 1 + .000023t) = 2.804 ( 1 + .000012 t )
Solving this equation
t = 122C
Final temperature of both = 122 +20 = 142 C
C), Leaf falling off a tree to the ground.
All the all of them are pretty good examples except for A, C is the answer because the leaf would be high up in the tree. The wind would cause force against the tree knocking the leaf down onto the ground. That acts as distance.
Hope this helps! ✨