As part of a department store display, a model train D runs on a slight incline between the store’s up and down escalators. When the train and shoppers pass point A, the train appears to the shopper on the up escalator B to move downward at an angle of 22° with the horizontal, and to a shopper on the down escalator C to move upward at an angle of 23° with the horizontal to travel to the left. Knowing that the speed of the escalators is 3 ft/s, determine the speed (ft/s) of the train.

Q: 250 m 45° 162 kph 144 kph 300 m 30°

A:

Q: Suppose that a = 6.25 in. and b = 2.5 in. (Figure 1) Figure - y² = x a 1 of 1 Part A Determine the…

A: Given: a= 6.25inch, b =2.5inch Required : Moment of inertia of shaded area about x axis

Stair construction and layout

Stair is a type of vertical transportation in a building which consist of a series of steps in a flight of stairs that enable the vertical movement of people and materials from one floor to another. A staircase consists of steps that comprises of riser & tread, handrail, baluster, stair stringers, newel post and waist slab. The construction of staircase with all the components is termed as stair construction. A staircase is an enclosure that contains the entire stairway. The materials used for the construction of stairs are bricks, reinforced cement concrete, stone, lumber, steel and a combination of these materials.