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3 years ago

7

Why is standing in a canoe in the water a bad idea? Why is it even a worse idea for several people to stand on one side inside o

f the canoe? Explain your answer in DETAIL.

1 answer:

Whitepunk [10]3 years ago

3 0

Answer:

because of the weight is the canoe boat and can be dip off when you put to much pressure on to it.

Explanation:

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Anna studies the color of her bedroom wall using different lights. In sunlight, she sees that the wall is white. Anna darkens th

bonufazy [111]

Answer:

White

Explanation:

White light is not a color, its'a combination of all colors, the same as black is the absence of all colors. Therefore it cannot be assigned a single wavelength. White light contains all wavelengths from about 390 nm to 700 nm.

3 0

3 years ago

The change in color when acetone is placed on the wing is due to the difference between the indices of refraction of acetone and

Rasek [7]

Answer:

Option B and Option C

Explanation:

As we know that the wavelength of light is dependent on its speed. In fact the wavelength of light is directly proportional to the speed of the light. If the speed increases, the wavelength will also increase. While moving from air to acetone the speed of light reduces, and hence the wavelength reduces.

Wavelength is inversely proportional to the frequency. In acetone, the wavelength of light reduces, thus the frequency must increase and it should be higher than the frequency of light in air.

Option B and C are correct

3 0

3 years ago

Compute the mean and maximum velocities for a liquid with a flow rate of 20 L/min in a 1.5-in nominal diameter sanitary pipeline

vlada-n [284]

Answer:

Mean velocity = 0.292 m/s

Maximum velocity = 0.584 m/s

The flow is laminar as Re = 229.2

Explanation:

D = 1.5 inches = 0.0381 m

Q = volumetric flow rate = 20 L/min = 0.000333 m³/s

Q = A × v

A = Cross sectional Area = πD²/4 = π(0.0381)²/4 = 0.00114 m²

v = average velocity

v = Q/A = 0.000333/0.00114 = 0.292 m/s

For flow in circular pipes, maximum velocity = 2 × average velocity = 2 × 0.292 = 0.584 m/s

To check if the flow is laminar or turbulent, we need its Reynolds number

Re = (ρvD)/μ

ρ = 1030 kg/m

v = 0.292 m/s

D = 1.5 inches = 0.0381 m

μ = 50 cP = 0.5 poise = 0.05 Pa.s

Re = (1030 × 0.292 × 0.0381)/0.05 = 229.2

For laminar flow, Re < 2100

For turbulent flow, Re > 4000

And 229.2 < 2100, hence, this flow is laminar.

7 0

3 years ago

Which of the following is a true statement about mass and weight? a. Mass is a measure of how much matter an object has, while w

natka813 [3]

Answer:

b option mass will not change based on location while weight will changr based on gravitational pull

bcz in the formula of weight w=mg

so w is directly proportional to g

8 0

4 years ago

The rate constant for this first‑order reaction is 0.150 s−1 at 400 ∘C. A⟶products How long, in seconds, would it take for the c

Afina-wow [57]

Answer : The time taken for the concentration will be, 7.98 seconds

Explanation :

First order reaction : A reaction is said to be of first order if the rate is depend on the concentration of the reactants, that means the rate depends linearly on one reactant concentration.

Expression for rate law for first order kinetics is given by :

$k=\frac{2.303}{t}\log\frac{[A]_o}{[A]}$

where,

k = rate constant = $0.150s^{-1}$

t = time taken for the process = ?

$[A]_o$ = initial concentration = 0.860 M

$[A]$ = concentration after time 't' = 0.260 M

Now put all the given values in above equation, we get:

$0.150s^{-1}=\frac{2.303}{t}\log\frac{0.860}{0.260}$

$t=7.98s$

Therefore, the time taken for the concentration will be, 7.98 seconds

6 0

3 years ago