15
This depends on the length of the ladder. If the ladder is about 11.2 ft long, then it will reach 10 feet high on the building.
Ans2:This ladder setup will put the user at risk. The proper height to base distance gives a 4:1 ratio, that would give the ladder a ~15 deg angle with the wall. The setup described gives a 30 deg angle with the wall.The base of the ladder should be brought in so that it is at 2.5 feet from the wall. If the ladder is to be used for roof access, it should extend 3 feet past the edge so the user can use the ladder for support as he steps onto the roof. Additionally, the ladder should be tied to the roof at an appropriate anchor point.
To calculate the length of the ladder you apply Pythagoras: (B2 + W2)0.5 = L
...where B is the base to wall distance, W is the height of the wall and L is the ladder length.
Note: Raising a value to the 0.5 power is the same as taking the square root of that value...you can't show a square root radical in WA's text format.
18
Your stopwatch can't count on any longer after it reaches 1000 hours.
because your ears actually have a tube that reaches to your mouth. it is small but it still counts and can be felt. a cold is bacteria building up in your mouth and back of your throat area. the bacteria grows and can clog the tubes that go to your ears, hence the ear plugging.
32
180 degrees
Base-Isolated Building
Base-Isolated Building
it is designed to reduce the amount of energy that reaches the building during an earthquake
No
A Base-isolated designed building reduces the amount of energy that reaches the building during an earthquake. For older buildings they are retrofitted for earthquakes.
32
you can rest the house on shock-absorbing rubber pads.
you can rest the house on shock-absorbing rubber pads.
you can rest the house on shock-absorbing rubber pads.
you can rest the house on shock-absorbing rubber pads.
you can rest the house on shock-absorbing rubber pads.
you can rest the house on shock-absorbing rubber pads.