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Alexxx [7]
2 years ago
12

Dolphins communicate underwater using sound waves. This is called ________.

Physics
2 answers:
Ray Of Light [21]2 years ago
7 0

Answer:

D. echolocation

<h2><em><u>Ple</u></em><em><u>ase</u></em><em><u> mark</u></em><em><u> my</u></em><em><u> answer</u></em><em><u> the</u></em><em><u> brainliest</u></em><em><u> and</u></em><em><u> rate</u></em><em><u> me</u></em><em><u> 5</u></em><em><u> star</u></em><em><u> and</u></em><em><u> follow</u></em><em><u> me</u></em><em><u> </u></em></h2>

<em><u>pl</u></em><em><u>ease</u></em><em><u> </u></em><em><u>please</u></em><em><u> please</u></em><em><u> please</u></em><em><u> please</u></em><em><u> please</u></em>

sdas [7]2 years ago
6 0

Answer:

<u>D. echolocation</u>

Explanation:

Dolphins communicate underwater using sound waves. This is called <u>echolocation</u>

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112<br> 11X13<br> 111<br> 10<br> 515<br><br><br> a. 106<br> B.92 c. 74<br> d. 88
nikitadnepr [17]

Answer:

it 106

Explanation:

3 0
3 years ago
A tray containing 0.20kg of water at 20degree celsius is placed in a freezer. The temperature of the water drops to 0degree cels
Nitella [24]

Answer:

a. Energy lost, Q = 16,800 Joules.

b. Power = 28 J/s

c. Time, t = 2357.14 seconds

d. I assumed that the ice remained at a temperature of zero degrees Celsius (0°C). Also, I assumed that the heat is being lost at a constant rate.

Explanation:

<u>Given the following data;</u>

  • Mass = 0.20 kg
  • Initial temperature, T1 = 20°C
  • Final temperature = 0°C
  • Time = 10 minutes

a. To find the energy lost by the water as it cools to 0 degree celsius;

Mathematically, heat capacity is given by the formula;

Q = mcdt

Where;

  • Q represents the heat capacity or quantity of heat.
  • M represents the mass of an object.
  • C represents the specific heat capacity of water.
  • dt represents the change in temperature.

dt = T2 - T1

dt = 20 - 0

dt = 20°C

We know that the specific heat capacity of water is equal to  4200 J/kg°C

Substituting the values into the formula, we have;

Q = 0.20 * 4200 * 20

<em>Energy lost, Q = 16,800 Joules.</em>

b. To find the average rate at which the water is losing energy in J/s by using the following formula;

Power = \frac {energy}{time}

First of all, we would have to convert the value of time in minutes to seconds.

<u>Conversion:</u>

1 minute = 60 seconds

10 minutes = X seconds

Cross-multiplying, we have;

X = 60 * 10

X = 600 seconds

Substituting the values into the formula, we have;

Power = \frac {16800}{600}

<em>Power = 28 J/s</em>

c. To estimate the time taken for the water at 0 degree celsius to turn completely into ice;

We know that the latent heat of fusion of water is equal to 3.3 * 10⁵ J/kg.

Mathematically, the latent heat of fusion is calculated by using the formula;

Energy, Q = ml = pt

Substituting the values into the formula, we have;

0.20 * 3.3 * 10⁵ = 28 * t

0.20 * 330000 = 28t

66000 = 28t

t = \frac {66000}{28}

<em>Time, t = 2357.14 seconds.</em>

d. The assumption made is that, the ice remained at a temperature of zero degrees Celsius (0°C). Also, I assumed that the heat is being lost at a constant rate.

6 0
2 years ago
Read 2 more answers
A battery establishes a voltage V on a parallel-plate capacitor. After the battery is disconnected, the distance between the pla
disa [49]

Answer:

d.

Explanation:

Since, the capacitance( decreases )

therefore voltage between the plates(increases ).

Hence, option d is correct.

C =εA/d.

d is doubled, therefore  C decrease ( inverse relation).

4 0
3 years ago
Q is granite, an igneous rock. Which of these is NOT a characteristic of igneous rock?
fgiga [73]

Igneous rocks are conglomerates, predominantly composed of rounded

gravel

Explanation:

The statement that igneous rocks are conglomerate predominantly composed of rounded gravel is not correct. Igneous rocks are rocks formed from magma that cools and solidifies.

  • Conglomerates are sedimentary rocks that are made of rounded clasts in a matrix.
  • They differ from igneous rocks that crystallize from molten magma.
  • Sedimentary rocks are usually derived from the process of weathering, erosion, transportation and deposition on the earth surface.
  • Igneous rocks forms from crystallized magma which can be on the surface or deep within the crust.

Learn more:

Sedimentary rocks brainly.com/question/2740663

#learnwithBrainly

8 0
3 years ago
Read 2 more answers
A warehouse worker is pushing a 90.0-kg crate with a horizontal force of 282 N at a speed of v = 0.850 m/s across the warehouse
Elanso [62]

Answer:

v_{f} = 0.51 \frac{m}{s}

Explanation:

We apply Newton's second law at the crate :

∑F = m*a (Formula 1)

∑F : algebraic sum of the forces in Newton (N)

m : mass in kilograms (kg)

a : acceleration in meters over second square (m/s²)

Data:

m=90kg :  crate mass

F= 282 N

μk =0.351 :coefficient of kinetic friction

g = 9.8 m/s² : acceleration due to gravity

Crate weight  (W)

W= m*g

W= 90kg*9.8 m/s²

W= 882 N

Friction force : Ff

Ff= μk*N Formula (2)   

μk: coefficient of kinetic friction

N : Normal force (N)  

Problem development

We apply the formula (1)

∑Fy = m*ay    , ay=0

N-W = 0

N = W

N = 882 N

We replace the  data in the formula (2)

Ff= μk*N  = 0.351* 882 N

Ff=  309.58 N

We apply the formula (1) in x direction:

∑Fx = m*ax    , ax=0

282 N - 309.58 N = 90*a  

a=  (282 N - 309.58 N ) / (90)

a= - 0.306 m/s²

Kinematics of the crate

Because the crate moves with uniformly accelerated movement we apply the following formula :

vf²=v₀²+2*a*d Formula (3)

Where:  

d:displacement in meters (m)  

v₀: initial speed in m/s  

vf: final speed in m/s  

a: acceleration in m/s²

Data

v₀ = 0.850 m/s

d = 0.75 m

a= - 0.306 m/s²

We replace the  data in the formula (3)

vf²=(0.850)²+(2)( - 0.306 )(0.75 )

v_{f} = \sqrt{(0.850)^{2} +(2)( - 0.306 )(0.75 )}

v_{f} = 0.51 \frac{m}{s}

8 0
3 years ago
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