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2 years ago

7

What percent of the world lumber harvest goes to paper production 10% 20% 25% 50%

1 answer:

sergejj [24]2 years ago

8 0

The answer is 50% of the paper production

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Fast need answers <br>Find the amount of force if the body has pressure of 178 Pa on 18 mm²

guajiro [1.7K]

Answer:

Force = 3.204Newton

Explanation:

Given the following data;

Pressure = 178

Area = 18 mm² to meter = 18/1000 = 0.018 m²

To find the force;

Force = pressure * area

Force = 178 * 0.018

Force = 3.204 Newton.

4 0

2 years ago

Which of the following iconic compounds forms an acid when dissolved in water

Anvisha [2.4K]

Answer: when an ionic compound dissolves in water, the positive ends of the water molecules are attracted to the anions and the negative ends are attracted to the cations.

Hydrogen Chloride (HCl) is a compound which forms an acidic solution when dissolved in water.

Hope it helps :)

Explanation:

6 0

2 years ago

Your low-flow showerhead is delivering water at 1.2×10−4m3/s, about 2.0 gallons per minute.

Oksanka [162]

To solve this problem it is necessary to apply the fluid mechanics equations related to continuity, for which the proportion of the input flow is equal to the output flow, in other words:

$Q_1 = Q_2$

We know that the flow rate is equivalent to the velocity of the fluid in its area, that is,

$Q = VA$

Where

V = Velocity

A = Cross-sectional Area

Our values are given as

$Q_2 = 1.2*10^{-4}m^3/s$

$d = 0.021m$

$r = \frac{0.021}{2} = 0.0105m$

Since there is continuity we have now that,

$V_1A_1 = Q_2$

$V_1A_1 = 1.2*10^{-4}$

$V_1 = \frac{1.2*10^{-4}}{A_2}$

$V_1 = \frac{1.2*10^{-4}}{\pi r^2}$

$V_1 = \frac{1.2*10^{-4}}{\pi (0.0105)^2}$

$V_1 =0.347m/s$

Therefore the speed of the water's house supply line is 0.347m/s

7 0

2 years ago

Steam enters a turbine at 400K and exhausts at 360K. Calculate the maximum efficiency. =%

kozerog [31]

The maximum efficiency is 10%

Explanation:

The maximum efficiency of a machine is given by:

$\eta=1-\frac{T_C}{T_H}$

where

$T_H$ is the temperature of the hot reservoir

$T_C$ is the temperature of the cold reservoir

For the machine in this problem, we have:

$T_H=400K$ is the temperature of the hot reservoir

$T_C=360K$ is the temperature of the cold reservoir

substituting, we find the max efficiency:

$\eta=1-\frac{360}{400}=0.1$

So, the efficiency is 0.10 (10%).

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8 0

2 years ago

What two angles of elevation will enable a projectile to reach a target 15 km downrange on the same level as the gun if the pro

forsale [732]

Angle of projection: 28 degrees or 62 degrees

Explanation:

A projectile consists of two independent motions:

A uniform motion along the horizontal direction
A uniformly accelerated motion along the vertical direction

From the equations of motion, it is possible to derive an expression for the range of a projectile, which is:

$d=\frac{u^2 sin(2\theta)}{g}$

where:

u is the initial speed

$\theta$ is the angle of projection

$g=9.8 m/s^2$ is the acceleration due to gravity

For the projectile in this problem, we have:

d = 15 km = 15,000 m is the range

$u=421 m/s$ is the initial speed

Solving the equation for $\theta$ , we find the possible angle:

$sin (2\theta) = \frac{dg}{u^2}=\frac{(15,000)(9.8)}{(421)^2}=0.829$

Which gives two values of the angle:

$2\theta = 56^{\circ} \rightarrow \theta=28^{\circ}\\2\theta=124^{\circ} \rightarrow \theta=62^{\circ}$

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4 0

2 years ago