Answer:
<em>P=mgh</em>
<em>P=mghm=55</em>
<em>P=mghm=55g=9.8 or ~10</em>
<em>P=mghm=55g=9.8 or ~10h=27</em>
Explanation:
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Yes. Momentum is a vector, so several non-zero momenta can add up to zero. Consider for a simple example a mass of 10kg moving to the right at 5m/s, and another mass of 10kg moving to the left at 5m/s. These momenta each have a magnitude equal to 50 kg m/s but have opposite sign and so the total system's momentum is zero.
Answer:
C
Explanation:
Water at normal temperature is a good lubricant and will hinder the brake from working properly when the road is wet. To dry the brakes off, apply brakes gently as you accelerate. This will generate some heat that will evaporate the water with the help of friction.
Answer:
Temperature at which the resistance is twice the resistance at
is 
Solution:
As per the question:
Temperature coefficient, 
Reference temperature, 
Resistance, 
Now, using the formula:





- Yes, this temperature holds for all all the conductors of copper, irrespective of the size and shape of the conductor.