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3 years ago

5

sound transfers energy through solid liquid and gas what does ocean waves transfer energy through is it water or water and air a

s evaporation

1 answer:

trapecia [35]3 years ago

7 0

Hears the answer is endocytosis. <span />

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You have a match and you enter a wagon with a candle, a lamp and a fireplace. Which one do you light first?

NikAS [45]

You light the match :)

8 0

3 years ago

Read 2 more answers

How much heat is absorbed by a 66g iron skillet when its temperature rises from 7oC to 20oC?

fenix001 [56]

The heat absorbed is calculated using the following equation:
Q = mCΔT

Q = heat absorbed
m = mass = 66 g
C = specific heat of iron = 0.449 J/g.°C
ΔT = temperature change = 20 - 7 =13°C

Therefore,
Q = 66*0.449*13 = 385.242 J

3 0

3 years ago

A 20 g ball of clay traveling east at 4.5 m/s collides with a 45 g ball of clay traveling north at 2.0 m/s. You may want to revi

german

Answer:

The ball travels with a speed of 1.96 m/s in a North East direction

Explanation:

Based on the law of conservation of linear momentum, we have that

$m_{1}v_{1}+m_{2}v_{2}=(m_{1}+m_{2})v$

Since this problem involves motion in both the x and y coordinates, we will solve it in the separate coordinates, and then find the resultant as our answer.

Momentum in the x- direction

in the x direction, $v_{2}= 0$ . this makes $m_{2}v_{2}=0$

hence we have

$20\times4.5=65v_{x}$

$v_{x}=1.385m/s$

Momentum in the y- direction

in the y direction, $v_{1}= 0$ . this makes $m_{1}v_{1}=0$

hence we have

$45\times2.0=65v_{y}$

$v_{y}=1.385m/s$

The resultant of the two vectors can be found using Pythagoras' theorem

$v=\sqrt{1.385^{2}+1.385^{2}} =1.959$

The direction of the resultant vector is found as

$Tan^{-1}(\frac{1.385}{1.385})=45degrees$

Hence the ball moves with a velocity of 1.96m/s in a North East direction

7 0

3 years ago

An osprey's call is a distinct whistle at 2200 Hz. An osprey calls while diving at you, to drive you away from her nest. You hea

Elis [28]

Answer:

14.9 m /s

Explanation:

n = n° x v /[ v -v (s) ]

n is apparent frequency , n° is source frequency,v is speed of sound and v(s)

speed of source.

2300 = 2200 x 343 / [343 -v(s)]

v (s ) = 14.9 m /s.

4 0

3 years ago

Two moles of an ideal gas are compressed in a cylinder at a constant temperature of 80.0 ∘c until the original pressure has trip

elena55 [62]

The work done by a gas during an isothermal process is given by:
$W=nRT ln \frac{V_f}{V_i}$ (1)
where
n is the number of moles of the gas
R is the gas constant
T is the absolute temperature of the gas
$\frac{V_f}{V_i}$ is the ratio between the final volume and the initial volume of the gas

We need to calculate this ratio, and we can do it by using the gas pressure. In fact, for an isothermal process, Boyle's law states that the product between pressure and volume of the gas is constant:
$pV=k$
which can be rewritten as
$p_i V_i= p_f V_f$
which is equivalent to
$\frac{V_f}{V_i}= \frac{p_i}{p_f}$
The problem says that the pressure of the gas is tripled, therefore the ratio between final and initial volume is:
$\frac{V_f}{V_i} = \frac{p_i}{3 p_i} = \frac{1}{3}$

Now we can use eq.(1) to calculate the work done by the gas. The absolute temperature is
$T=80.0^{\circ}C+273 = 353 K$
The number of moles is n=2, therefore the work done is
$W=nRT ln \frac{V_f}{V_i}=(2 mol)(8.31 J/mol K) (353 K) \ln \frac{1}{3}= -6445 J$
And the work is negative, because it is done by the environment on the gas (the gas is compressed)

6 0

3 years ago