(1) Suppose a person is covered head to foot by wool clothing with average thickness of 2.5 cm and is transferring energy of 3000 joules by conduction through the clothing for 1 minutes. What is the temperature difference across the clothing, given the surface area is 1.8m2? (Given: Thermal conductivity of wool is 0.04 W/mK) The difference in temperature =

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A: mass of box = m = 10 kg co efficient of friction = 0.7 acceleration = a = 6 m/s2

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.