To contain a violent mob, the riot squad approaches with fire hoses. Suppose that the rate of flow of water through a fire

To contain a violent mob, the riot squad approaches with fire hoses. Suppose that the rate of flow of water through a fire hose is 24 kg/s, and the stream of water from the hose moves at 17 m/s. What force is exerted by such a stream on a person in the crowd? Assume that the water comes to a dead stop against the person's chest.

Expert Solution

We have force F = Δp/Δt

= Δ(mv)/Δt

Here the velocity is constant.

Therefore F = v Δm/Δt

Given the speed of water v = 17 m/s

And the rate of flow of water Δm/Δt = 24 kg/s

Then force exerted by the stream of water on the person

F = (17m/s)(24kg/s)

= 408 N

Then force exerted by the stream of water on the person is 408 N.

Junaid answered 2 years ago

Fire hoses used in major structural fires have an inside diameter of 6.40 cm. Suppose such...

Fire hoses used in major structural fires have an inside diameter of 6.40 cm. Suppose such a hose carries an inital flow of 40.0 L/s at ground level, starting at a gauge pressure of 1.62 x 106 N/m2. The hose rises up 10.0 m along a ladder to a nozzle having an inside diamter of 3.00 cm. (Hint use Bernoulliʻs equation) 1)Draw a diagram of what is happening? 2)What is the speed at v1 and v2 in m/s? 3)What is...

A Rankine cycle uses water as its working fluid. The mass flow rate of water through...

A Rankine cycle uses water as its working fluid. The mass flow rate of water through the cycle is 150 kg/s. Superheated vapour exits the boiler at 8 MPa and 560 °C. The condenser pressure is 8 kPa. The water at the pump inlet is 35 °C. The isentropic efficiency of the pump is 75% and the isentropic efficiency of the turbine is 91%. The turbine and pump can be treated as adiabatic. The pressure drops of the working fluid...

Explain the 3 hypotheses for the flow of water through a stem

The water flow rate for a particular sprinkler is 19 gpm. The water must be projected...

The water flow rate for a particular sprinkler is 19 gpm. The water must be projected at least 24 feet in radius. The sprinkler is mounted 11 feet above the ground and is aimed at an angle of 26 degrees above the horiztonal. With what velocity must the water leave the sprinkler? What diameter (inches) should the opening be to achieve this velocity? Water Velocity =_______ ft/s Diameter Opening = ______ inches

The water flow rate for a particular sprinkler is 16 gpm. The water must be projected...

The water flow rate for a particular sprinkler is 16 gpm. The water must be projected at least 25 feet in radius. The sprinkler is mounted 11 feet above the ground and is aimed at an angle of 29 degrees above the horiztonal. With what velocity must the water leave the sprinkler? What diameter (inches) should the opening be to achieve this velocity?

The water flow rate for a particular sprinkler is 18 gpm. The water must be projected...

The water flow rate for a particular sprinkler is 18 gpm. The water must be projected at least 22 feet in radius. The sprinkler is mounted 10 feet above the ground and is aimed at an angle of 29 degrees above the horiztonal. With what velocity must the water leave the sprinkler? What diameter (inches) should the opening be to achieve this velocity? Water Velocity = ft/s Diameter Opening = inches

The flow of water through soil depends on the porosity of the soli which is assumed...

The flow of water through soil depends on the porosity of the soli which is assumed to be normally distributed. To compare two types of sandy soil n1=16 measurements are to be taken on the porosity of soil A and n2=21 measurements are to be taken on soil B Assume that the two sample variances S12= 0.01, S22= 0.02. (a) construct a 95% confidence interval for ratio of variances (variance2/variance1). Is there any evidence that two population variances are qual....

assuming that the flow pattern is laminar flow rate of 200 gal/ min through a drill...

assuming that the flow pattern is laminar flow rate of 200 gal/ min through a drill string having a 3.826-in. id and through an 8.5-x 5-in. annulus, calculate the required mud volume using 20% as volume safety factor given that depth of drill well = 10000 ft, length of drill collars= 500 ft, OD of drillingcollar= 6.5 in, ID of drilling collar = 2.25 in, casing setting depth = 5000 ft , case ID= 8.681 in, OD of drillpipes =...

We designed the water flow rate to supply water to the increased population in New Jersey...

We designed the water flow rate to supply water to the increased population in New Jersey in 2020 and the trapezoidal canal that conveys the increased amount of water resources like Figure 2. The concrete-lined canal (n=0.015) is to have a B (bottom width) /yn (B/yn) of 2.0, 2H:1V side slopes and a velocity of 5.0 feet/s. The normal water depth is 3.75 ft and the longitudinal slope is 0.000825. 2.1. When the depth of flow at the gaging...

A flow rate of Va (in) = 300 [mL / min] of water is mixed in...

A flow rate of Va (in) = 300 [mL / min] of water is mixed in a static mixer with an aqueous solution containing an active ingredient B, at the concentration Cb (in) = 0.2 [mM]. Water density = 1003 [kg / m ^ 3], density of the aqueous solution = 1010 [kg / m ^ 3] Calculate the volumetric flow rate, V (in) in [mL / min] of the aqueous solution containing the active ingredient B entering the static...

Question