Answer:
hello your question lacks the required diagram attached below is he missing diagram and solution
answer : 17480.618 Ib
Explanation:
To calculate the weight of block neccessary to prevent the gate from opening , we will first calculate the force of water from the hinge
next we will calculate moments about the force of water and the force about the hinge of the gate
attached below is the complete solution and free hand sketch
from the sketch : h1 = 7 ft, x = 2ft, h2 = 5ft,
Answer: B) High chemical energy and low molecular weight
Explanation: Liquid propellant is a a single chemical compound or mix of other chemicals as well. It is used in the rocket that uses them as a major part for the fuel. A liquid propellant is supposed to have high chemical energy and low molecular weight so that is can be ignited with ease. High chemical energy can release good amount of heat in a chemical reaction and thus is good igniting compound for the liquid propellant rocket.
Answer:
For a new constructed building, causes of cracks and building failure are;
- permeability of concrete
- poor construction practices
- poor structural design and specifications
Explanation:
Cracks on buildings start when stress in components exceeds its strength. The externally applied forces that cause cracks on structures are : dead forces, live forces, seismic forces or forces on the foundation settlement. Internally forces that cause cracks include variation on temperatures, moisture content changes and chemical actions. Measuring and monitoring movements of cracks can be done through; using tell-tale, using a crack width gauge and use of precision calipers.