The eiffel tower in paris is 300 meters tall on a cold day (t = -24 degrees celsius), what is its height on a hot day when the temperature is 35 degrees? (it is made of iron which has a coefficient of linear expansion of 0.12 per degree celsius.)

Length of Eiffel tower, when the temperature is 35 degrees = 300.21 m

Explanation:

Thermal expansion is given by the expression

Here length of Eiffel tower, L = 300 m

Coefficient of thermal expansion, α = 0.000012 per degree Celsius

Change in temperature, = 35 - (-24) = 59degrees Celsius

Substituting

Length of Eiffel tower, when the temperature is 35 degrees = 300 + 0.2124 = 300.21 m

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.