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4 years ago

Heat from a fire warming your hands is an example of

Physics

2 answers:

Olin [163]4 years ago

8 0

Answer:

Thermal Radiation

Explanation:

Type of heat transfer Hope this helped <3

vodomira [7]4 years ago

6 0

Answer:

Thermal energy is the total kinetic energy of moving particles of matter, and the transfer of thermal energy is called heat. Thermal energy from the bonfire is transferred to the hands by thermal radiation. ... This is how the fire warms the hands of someone sitting near the bonfire.May

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A spaceship from a friendly, extragalactic planet flies toward Earth at 0.201 times the speed of light and shines a powerful las

bagirrra123 [75]

Answer:

The wavelength of observed light on earth is 568.5 nm

Explanation:

Given that,

Velocity of spaceship $v= 0.201c$

Wavelength of laser $\lambda= 697\ nm$

We need to calculate the wavelength of observed light on earth

Using formula of wavelength

$\lambda_{0}=\lambda_{e}\times\sqrt{\dfrac{1-\dfrac{v}{c}}{1+\dfrac{v}{c}}}$

$\lambda_{0}=697\times10^{-9}\times\sqrt{\dfrac{1-\dfrac{0.201 c}{c}}{1+\dfrac{0.201c}{c}}}$

$\lambda_{0}=697\times10^{-9}\times\sqrt{\dfrac{1-0.201}{1+0.201}}$

$\lambda=5.685\times10^{-7}\ m$

$\lambda=568.5\times10^{-9}\ m$

$\lambda=568.5\ nm$

Hence, The wavelength of observed light on earth is 568.5 nm

8 0

4 years ago

When a bow is stretched it stores 10j and the arrows mass is 50g as it is projected show that the arrow has a speed of 20m/s

asambeis [7]

Answer:

20 m/s

Explanation:

The stored energy is transformed to kinetic energy and since kinetic energy is given by

$0.5mv^{2}$

where m is the mass of arrow in Kg and v is the velocity of the arrow in m/s. From the principle of energy, all the energy is transformed to KE.

KE= Energy stored in bow

Changing mass from 50 g to Kg we divide by 1000 hence m=50/1000=0.05 Kg

Substituting 0.05 Kg for m and 10 J for KE then we have

0.5\times 0.05\times v^{2}=10 J

Making v the subject of the formula then

$v=\sqrt {\frac {10 J}{0.5\times 0.05 Kg}}=20\ m/s$

Therefore, the velocity is equivalent to 20 m/s

6 0

3 years ago

Plz answer the question

Vikentia [17]

Answer:

Ray A = Incidence ray

Ray B = Reflected ray

Explanation:

From the law of reflection,

Normal: This is the line that makes an angle of 90° with the reflecting surface.

Ray A is the incidence ray: This is the ray that srikes the surface of a reflecting surface. The angle formed between the normal and the incidence ray is called the incidence angle

Ray B is the reflected ray: This is the ray leaves the surface of a reflecting surface. The angle formed between the reflected ray and the normal is called reflected angle

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3 years ago

Look at the quote: "Newton's laws of motion can be summarized in two simple ideas...." According to Newton's laws of motion, the

sertanlavr [38]

Bell math hajawonbejwbwbanananwnw w a. Sor

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3 years ago

Imagine that you have a rectangular swimming pool, but you have no idea how deep it is. You know that the pool has a volume of 2

umka21 [38]

Volume of any rectangle cuboid such as a pool length*width*height
and area is length*width

Now, volume/area=height

height=216/90
height=2.4m

3 0

4 years ago

Heat from a fire warming your hands is an example of​

Heat from a fire warming your hands is an example of