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2 years ago

Radiation transfers thermal energy through

Physics

1 answer:

Kay [80]2 years ago

3 0

Answer: your answer is waves.

I will type random words cause my answer is “too short”: dnuidnuindudnnnudinnndijndiudnnnndnijndjidnjidnijdnijdnnnndnjidnjidnnn

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A cannonball is tired with an initial speed of 40m/s and a launch angle of 30degrees from a cliff that is 25m tall. a. What is t

ella [17]

Answer:

Part a)

$t = 5.1 s$

Part b)

$x = 176.7 m$

Explanation:

Initial speed of the launch is given as

$v_i = 40 m/s$

angle = 30 degree

Now the two components of the velocity

$v_x = v_i cos30$

$v_x = 34.6 m/s$

similarly we have

$v_y = v_i sin30$

$v_y = 20 m/s$

Part a)

Now to find the time of flight we will have

$\Delta y = v_y t + \frac{1}{2}at^2$

$-25 = 20 t -\frac{1}{2}(9.81)t^2$

$t = 5.1 s$

Part b)

Distance at which the ball will land is given as

$x = v_x t$

$x = 34.6 (5.1)$

$x = 176.7 m$

Part c)

Since x direction there is no acceleration so it will move with uniform speed while in y direction it will accelerate due to gravity

7 0

2 years ago

Find the intensity of a 55 dB sound given lo-10-12 wm2

Inessa05 [86]

Answer:

Intensity= $I=3.16\times 10^{-7}\ W\ m^{-2}$

Explanation:

Given:

$\beta=55\ dB\\I_o=10^{-12}\ W\ m^{-2}$

The sound level $\beta$ in dB with intensity $I$

and reference intensity $I_0$ is given by:

$\beta(dB)=10 \log_{10}(\frac{I}{I_0})$

Plugging in values.

$55=10 \log_{10}(\frac{I}{10^{-12}})$

Dividing both sides by 10.

$\frac{55}{10}=\frac{10 \log_{10}(\frac{I}{10^{-12}})}{10}$

$5.5=\log_{10}\frac{I}{10^{-12}}$

The above can be written as

$10^{5.5}=\frac{I}{10^{-12}}$

Multiplying both sides by $10^{-12}$

$10^{5.5}\times 10^{-12}=10^{-12}\times \frac{I}{10^{-12}}$

$10^{(5.5-12)}=I$

$10^{(-7.5)}=I$

∴ $I=3.16\times 10^{-7}\ W\ m^{-2}$

Intensity = $I=3.16\times 10^{-7}\ W\ m^{-2}$

7 0

3 years ago

When collecting a gas over water, the gas is always a mixture of the gas collected and water vapor.

bagirrra123 [75]

When collecting a gas over water, the gas is always a mixture of the gas collected and water vapor. This statement is True

Water vapour or aqueous vapour is the name for the gaseous state of water. It is a particular kind of water condition inside the hydrosphere. Both the boiling and evaporation of liquid water as well as the sublimation of ice can produce water vapour. Water vapour is transparent, like the bulk of other atmospheric constituents. An example of water vapour is the mist that floats over a pot of boiling water.

<h3>What is Water vapor ?</h3>

The gaseous phase of water is known as water vapour, water vapour, or aqueous vapour. Within the hydrosphere, it is one type of water state. Water vapour can be created by the boiling or evaporation of liquid water as well as by the sublimation of ice. Like the majority of other atmospheric elements, water vapour is transparent.

Learn more about Water vapor here:

brainly.com/question/422363

#SPJ4

7 0

1 year ago

Noah drops a rock with a density of 1.73 g/cm3 into a pond. Will the rock float or sink? Explain your answer.

wel

Answer:

Sink

Explanation:

The normal density of water is 1 g/cm3. Since the rock has a higher density of 1.72g/cm3, it will sink in water.

5 0

2 years ago

Question:The greater the

Romashka-Z-Leto [24]

Answer:

True

Explanation:

when the object is larger , the inertia of the object is larger so its tendency to change its state of motion is reduced is reduced.

5 0

2 years ago