In a nuclear reactor a moderator is used to

Answer: 5.0 m/s

Explanation:i had this question on my test

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Conservation of linear momentum

[tex]\\ \rm\Rrightarrow m1v1+m2v2=(m1+M2)v3[/tex]

[tex]\\ \rm\Rrightarrow 1200(2.5)+2600(6.2)=(1200+2600)V3[/tex]

[tex]\\ \rm\Rrightarrow 3000+16120=3800v3[/tex]

[tex]\\ \rm\Rrightarrow 19120=3800v3[/tex]

[tex]\\ \rm\Rrightarrow V3=5m/s[/tex](Approx)

[tex]\huge{\color{red}{\fbox{\textsf{\textbf{Answer}}}}} [/tex]

1) 5 seconds

2) 75 meters

Explanation:

Refer to the attachment

There are many Autotrophs than consumers because : Autotrophs are the bases of any food chain/web

Autotrophs capture the energy required for every food chain or web from which sustains other organisms in the food chain form sunlight and chemicals. Also there is always more biomass present in the lower levels of the trophic system as biomass decreases as we move up the food chain.

Since autotrophs are producers, for a healthy food chain there would be more autotrophs than consumers.

Hence we can conclude that There are many Autotrophs than consumers because : Autotrophs are the bases of any food chain/web

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The motorcycle's average velocity will be 6 m/sec. The ratio of the overall distance traveled to the total time taken by the body is the average velocity.

The average velocity is the ratio of the total distance traveled to the total time taken by the body. Its unit is m/sec.

Total distance travelled by the  motorcycle;

d=20 m+10 m

d=30 m

The average velocity is found as;

[tex]\rm v_{avg}=\frac{d}{t} \\\\ \rm v_{avg}=\frac{30}{5} \\\\ v_{avg}= 6 \ m /sec[/tex]

Hence,the motorcycle’s average velocity will be 6 m/sec.

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The diagram shows different body planes. X shows sagittal,Y shows frontal and Z shows transverse axis. Option B is correct.

A frame of reference is a mathematical and physical coordinate system whose origin, direction, and scale are given by a collection of reference points.

1. Frontal Plane divides the body into front and posterior sections.

2. The Sagittal Plane divides the body into left and right halves.

3. The transverse plane divides the body into superior and inferior halves.

The diagram shows different body planes. X shows sagittal,Y shows frontal and Z shows transverse axis.

Hence,option B is correct.

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78 percent nitrogen and 21 percent oxygen

Answer:

C

Explanation:

High pitch due to high frequency b/c of doppler effect. The sound waves in front of the vehicle are being squashed together by the moving ambulance. This causes more vibrations to reach your ear per second.

1. The length of the bridge is 360 m.

2. The speed of train in km/hr to cross the bridge in 24 s is 72 km/hr.

3. The length of the train when it cross the bridge in 36 seconds is 540 m.

What is speed?

Speed is the ratio of distance traveled and the time taken to cover that distance.

1.

The speed of train m/s is 54 x 5/18 = 15 m/s

The train crosses the bridge in 32 s, distance traveled by train will be

=32 x 15 =480m

The length of the bridge = (480 -120) =360 m

Thus, the length of the bridge is 360 m.

2.

Speed of train in m/s to cross the bridge in 24 s

= 480/24 = 20 m/s

Speed in km/hr =20 x 18/5 = 72 km/hr

Thus, Speed of train in km/hr to cross the bridge in 24 s is 72 km/hr.

3.

Speed of train in m/s =15 m/s

Train crosses the bridge in 36 s, then length of train will be

= 15 x 36m = 540m

Thus,  the length of the train when it cross the bridge in 36 seconds is 540 m

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The type of artificial intelligence used in the area of military operations is deep learning artificial intelligience.

The term artificial intelligence has to do with the simulation of the decision making ability of the brain in machines.

This has also been experimented in the area of military operations. This type of artificial intelligence is called deep learning artificial intelligience.

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Answer:

Mass of Earth (M1) = 6×10^24 kg

Mass of Puppy (M2) = 3.6 kg

Radius (R) = 6371000 m

Universal Gravitational Constant (G) = 6.67 × 10^11

Now,

Gravitational Force = G×M1×M2 / R^2

GF = 6.67 × 10^11 × 6 × 10^24 × 3.6 / (6371000)^2

GF = 144.072 × 10^35 / 40,589,641,000,000

GF = 3549.477 × 10^20

As the volume of the container increases the pressure inside will decrease because the atoms have more room to move around in.

Answer:

 In a container of the same volume, a greater number of molecules results in greater pressure. Gas pressure increases as container volume decreases.

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Answer:

The gravitational force on the moon is less than on Earth because the strength of gravity is determined by an object's mass. The bigger the object, the bigger the gravitational force. Gravity is pretty much everywhere. We just feel it in different ways depending on our state of motion.

Explanation:

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Let's find the relationship

[tex]\\ \rm\Rrightarrow E=h\nu[/tex]

[tex]\\ \rm\Rrightarrow \lambda=\dfrac{c}{\nu}[/tex]

The quantity of heat that was transferred to the block of iron is 5544 J or 5.544 kJ

From the question, we are to determine how much heat was transferred to the block of iron

Using the formula,

Q = mcΔT

Where Q is the quantity of heat

m is the mass

c is the specific heat capacity of the substance

and ΔT is the change in temperature

From the given information,

m = 0.400 kg

ΔT = 325 - 295 = 30 K

Putting the parameters into the equation, we get

Q = 0.400 × 462 × 30

(NOTE: Specific heat capacity of iron = 462 J/kg.K)

∴ Q = 5544 J

Hence, the quantity of heat that was transferred to the block of iron is 5544 J or 5.544 kJ

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Answer:

You need to be careful when finding the true age of sedimentary rocks to understand its full history.

Explanation:

The length the student should record as correct is ​18.55 centimeters (cm) because it is the average value.

The average value is a number associated with the middle amount for a given number of measured samples.

In this case, the median value results less useful to describe a set of data when compared to the average.

In conclusion, the length the student should record as correct is ​18.55 centimeters (cm) because it is the average value.

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Answer:

by obtaining the total mass of the dimes present:

d = 27.22 g / dozen       the density of dimes

M = n * d = 5 dozen * 27.22 g / dozen = 126.1 g

Answer:

0.6

Explanation:

the original wire is three times the length there fore the longer the wire the more resistance

therefore the resistance of the original wire is 3 times greater making it 0.6

The horizontal component of the velocity with which Ronnie kicks a playground ball is 12.3 m/s.

The horizontal component of the velocity with which Ronnie kicks a playground ball is calculated as follows;

Vx = Vcosθ

where;

Vx = 16 x cos(40)

Vx = 12.3 m/s

Thus, the horizontal component of the velocity with which Ronnie kicks a playground ball is 12.3 m/s.

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Answer:

D) 12.3

Explanation:

took the test

The markdown price for a mountain bike is $584.35

Markdown price is the discount offered by the shopkeepers to the customers to increase the sales rate.

M.P = S.P (1-r/100)

The following expression can be used every time we have to find the markdown price.

Substitute Selling price S.P =$899 and the percent r =35/100 =0.35, we get

M.P = $899(1-0.35)

M.P =$584.35

Thus, the markdown price is $584.35

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120 min = 2 hours

95 x 2 : 1000 =0.19 kwh

8¢ x 0.19 kwh = 1.52¢

The cost of running the 95 W TV for 120 minutes if charged at 8 ¢ per kWhr is 1.52 ¢

E = Pt

E = 0.095 × 2

E = 0.19 KWhr

Cost = Energy × Cost per KWhr

Cost = 0.19 × 8

Cost = 1.52 ¢

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Answer:

[tex] \: [/tex]

Explanation:

Before converting , Let's recall this :

[tex] \: [/tex]

Now, Let's Convert it :

[tex] \\ \longrightarrow \qquad \sf \: 54km / hr \\ [/tex]

[tex]\\ \longrightarrow \qquad \sf \: \frac{54 \times 1km}{1hr} \\ [/tex]

[tex]\\ \longrightarrow \qquad \sf \: \frac{54 \times 1000m}{3600s} \\ [/tex]

[tex]\\ \longrightarrow \qquad \sf \: \frac{54000 m}{3600s} \\ [/tex]

[tex]\\ \longrightarrow \qquad \sf \: \frac{540\cancel{0 }\cancel{0} m}{36 \cancel{0 }\cancel{0}s} \\ [/tex]

[tex]\\ \longrightarrow \qquad \sf \: \frac{540 m}{36s} \\ [/tex]

[tex] \\ \longrightarrow \qquad \frak{\pmb{ 15m /s}} \\ [/tex]

Answer:

O ice

Explanation:

Albedo refers to the proportion of the incident light that is reflected by a surface to the amount of incoming light.

Here, only ice will reflect even some amount of light. Pavement and dirt do not reflect at all, meanwhile, where glass reflects slightly.

Answer:

100N

Explanation:

Both rocks hit the ground at the same time and at the same distance from the base of the cliff. Option A is correct.

Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by u for the initial speed while u for the final speed. its SI unit is m/sec.

If the  resistance is ignored, things falling near the Earth's surface have the same estimated acceleration due to gravity of 9.8 meters per second.

As a result, the objects' acceleration is the same, and their velocity is growing at a consistent pace.

So that both rocks hit the ground at the same time and at the same distance from the base of the cliff.

Hence, option A is correct.

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Answer: 10 million degrees

Explanation:

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