For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass

Explain why, the walls of a dam are thicker near the bottom than at the top .

The thickness of window panes of old buildings is more at the bottom than at the top, which is due to

The thickness of window panes of old buildings is more at the bottom than at the top, which is due to

A steel ball is dropped from the roof of a building .An observer standing in front of a window 1.25 m high notes that the ball takes 1/8 s to fall from the top to the bottom of the window .The ball reappears at the bottom of the window 2s after passing it on the way down,if the collision between the ball reappears at the bottom of the window 2s after passing it on the way down.If the collision between the ball and the ground is perfectly elastic,then find the height of the building?Take g=10 m//s^(2) .

A city building code requires that the area of the windows must be at least (1)/(8) of the area of the walls and roots of all new building. The daily heating cost of a new building is ₹ 3 per square meter of window area and ₹ 1 per square metre of wall and roof area. To the nearest square metre of wall and roof area. To the nearest square metre, what is the largest surface area a new building can have if its daily heating cost cannot exceed ₹ 1,000 ?

A dam has broader walls at the bottom than at the top. Explain.

From the top of a building 100 m high, the angles of depression of the bottom and the top of an another building just oppositeto it are observed to be 60^(@) and 45^(@) respectively. Find the height of the building.