Answer: I believe his brother, Mike, who is 6'2, will have the longer shadow.
Complete Question
The complete question is shown on the first uploaded image
Answer:
The value of 
and 
Explanation:
Considering the diagram,
Taking moment about the pivot , we have
=>
Generally given that the bar is at equilibrium then the upward forces is equal to the down ward force
So
=> 
=>
Answer:
This is because below 4°c, water unlike other materials becomes less dense when it's temperature is further lowered.
Explanation:
Due to the unusual nature of water; at about 4°c, the behavior of the density of water in relation to its temperature reverses. This means that water becomes less dense as it becomes colder below 4°c. The colder parts therefore floats to the top of the water body while the warmer part sinks allowing the top to freeze and the remaining body below to remain in its liquid state.
The freezing of the top of the lake alone protects the remaining depth of water from freezing by acting as an insulator and preventing further heat loss from the water to the ambient space. If this had not been the case, and water froze all through, marine lives will freeze to death and it will be more difficult to melt the ice come the next summer.
This behavior is due to the hydrogen bonding of the water molecules.
