Answer:
1 true, 2 true, 3 false, 4 false and 5 true
Explanation:
The magnetic field lines are used to graphically represent the magnetic field,
1 true. Because the field line is a graphic representation of the magnetic field
2 true leave one pole and reach another, there are no magnetic monopoles
3 false. The density of the lines gives an idea of the strength of the field, they are dense where the field is greater
4 false. The magnetic force is perpendicular to the field and therefore to the field lines
5 true. With the same experimental conditions, each field gives a unique force, if the lines cross different fields they would give the same force.
Answer:
RIGHT
Explanation:
given,
mass of box = 250 kg
speed of the truck = 25 m/s
static friction µs = 0.7
g = 10 m/s²
to find direction of friction on the box
truck is moving in left direction and suddenly in front of truck a car stops then the driver hit the brake hard so at that moment the box on the trailer will have the tendency to move left so to oppose its movement friction force will be on RIGHT
<span>A fire sprinkler contractors work with the following people:
</span>- <span>fire-related organizations: They collaborate with the local fire department and work under the supervision of an organization that ensures all protocols are followed, from the application of the permit to the installation and right down to the inspection and maintenance. Example of which is the National Fire Protection Association (NFPA) in the United States.
- building-code organizations: There are national and local building codes, and this includes fire prevention. Fire sprinkler contractors should also follow these standards.
- certified fire inspectors: These are people certified by the local fire department or an authorized organization, like the NFPA, to inspect the building before and after the installation of the fire sprinkler
- manufacturers and suppliers: Fire sprinkler contractors directly work with manufacturers or direct suppliers to meet their specific needs when it comes to quantity and other specifications and also to minimize the cost.
- engineers and specialized plumbers: These engineers do the hydraulic calculations, which means determining the amount of water required to efficiently control a fire through a certain medium, which in this case is the fire sprinkler. They closely work with specialized plumbers to take care of the piping designs, materials, and installation.
- insurance companies: Fire sprinkler contractors also work with insurance companies to cover the cost of damages in case accidents happen. The scope of the insurance varies per contract. </span>