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3 years ago

QUESTION 4

1 answer:

7 0

4.

<span>A scientist who alters data to ensure a desired outcome is behaving unethically.

5.

Honesty

6.

True

7.

True

8.

Bias

9.

False

"Non nobis Domine, non nobis, sed Nomini tuo da gloriam."

Regards M.Y.
</span>

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The diagram shows how an image is produced by a plane mirror.

nadezda [96]

I had this question on a quiz, it was X.

3 0

3 years ago

Read 2 more answers

Please help !! ASAP

umka2103 [35]

Answer:

22) 5.6 Kg.m/s

23) 0.067 Kg

24) 1.16 m/s

Explanation:

Momentum is found by multiplying mass and velocity

P=mv where P is momentum, m is mass of object and v is the velocity

Given

Mass, m=2 Kg

Rate, v=2.8 m/s

Relationship

P=mv

Solution

P=mv=2*2.8=5.6 Kg.m/s

Given

Momentum, p=0.1 Kg.m/s

Rate, v=1.5 m/s

Relationship

P=mv and making m the subject then

$m=\frac {P}{v}$

Solution

$m=\frac {0.1 Kgm.s}{1.5 m/s}\approx 0.067 Kg$

Given

Momentum, $p=4.9\times 10^{8} Kg.m/s$

Mass, $m=4.23\times10^{8} Kg$

Relationship

P=mv and making v the subject then

$v=\frac {P}{m}$

Solution

$m=\frac {4.9\times 10^{8} Kgm.s}{4.23\times10^{8} }\approx 1.16 m/s$

5 0

3 years ago

Water exits a garden hose at a speed of 1.2 m/s. If the end of the garden hose is 1.5 cm in diameter and you want to make the wa

Katarina [22]

Answer:

A 93%

Explanation:

$P_1=P_2$ = Pressure will be equal at inlet and outlet

$\rho$ = Density of water = 1000 kg/m³

g = Acceleration due to gravity = 9.81 m/s²

$v_1$ = Velocity at inlet = 1.2 m/s

$v_2$ = Velocity at outlet

$r_1$ = Radius of inlet = $\dfrac{1.5}{2}=0.75\ cm$

$r_2$ = Radius of outlet

From Bernoulli's relation

$P_1+\dfrac{1}{2}\rho v_1^2+\rho gh_1=P_2+\dfrac{1}{2}\rho v_2^2+\rho gh_2\\\Rightarrow \dfrac{1}{2}\rho v_1^2+\rho gh_1=\dfrac{1}{2}\rho v_2^2+\rho gh_2\\\Rightarrow v_2=\sqrt{2(\dfrac{1}{2}v_1^2+gh_1-gh_2)}\\\Rightarrow v_2=\sqrt{2(\dfrac{1}{2}1.2^2+9.81\times 15)}\\\Rightarrow v_2=17.19709\ m/s$

From continuity equation

$A_1v_1=A_2v_2\\\Rightarrow \pi r_1^2v_1=\pi r_2^2v_2\\\Rightarrow r_2=\sqrt{\dfrac{r_1^2v_1}{v_2}}\\\Rightarrow r_2=\sqrt{\dfrac{0.0075^2\times 1.2}{17.19709}}\\\Rightarrow r_2=0.00198\ m$

The fraction would be

$\dfrac{A_1-A_2}{A_1}\times 100=\dfrac{r_1^2-r_2^2}{r_1^2}\times 100\\ =\dfrac{0.0075^2-0.00198^2}{0.0075^2}\times 100\\ =93.0304\ \%$

The fraction is 93.0304%

8 0

3 years ago

A train left the station at 9:00am. The next stop was 629 km south. It

Aleks04 [339]

Explanation:

We need to calculate the time it had travelled first:

9:00 to 12:00 = 3 hours.

12:00 to 2:00 = 2 hours

Total travel time = 5 hours.

The formula for speed is distance ÷ time (Hence, the unit for speed is m/s, kph, mph, etc.)

= 629km ÷ 5 hours

= 125.8 km/hour ~ 125.8kph

3 0

3 years ago

If you are soaking wet and the water on your clothes evaporates, you will feel cold. Explain the cooling effect in the terms of

Georgia [21]

Explanation:

Evaporation requires energy in order to break up intermolecular forces and excite water molecules (fast-moving gas molecules vs. slower moving liquid molecules). Therefore when the water in the wet clothes evaporates, it is drawing away some heat from your body (the surroundings

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3 years ago