a firefighter arrived at a burning building and felt the heat immediately this is due to the thermal energy transfered by

Answers

Answer 1

Answer: ... the process of "radiation". He would feel it even if there were
no air between the fire and him.

Answer 2

Answer: A firefighter arrived at a burning building and felt the heat immediately this is due to the thermal energy transfered by the atmospheric air.

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A pendulum takes 0.5 second to complete one cycle. What is the pendulum’s period and frequency?
how far can a person run in 15 minutes if he or she runs a at an average speed of 16 km/hr? what is the runners distance traveled in miles
The density of ocean water increases when ita. joins the Gulf Stream. c. gets warmer. b. gets colder. d. turns to ice. Please select the best answer from the choices provided A B C D

In which type of wave do the particles in a medium move perpendicular to the direction that the wave moves? A.transverse waves

B.ocean waves

C.surface waves

D.longitudinal waves

Answers

A.transverse waves....

A rotating fan completes 1200 revolutions every minute. consider the tip of a blade, at a radius of 0.19 m. through what distance does the tip move in one revolution?

Answers

The tip of the fan moves through the outer side of the circle.

So it moves a distance of perimeter of circle in one revolution.

Perimeter of circle = 2 $\pi$ r, where r is the radius of circle.

In this case radius of circular motion = 0.19 meter

So perimeter of circle = 2 $\pi$ *0.19 = 0.38 $\pi$ = 1.194 m

So distance does the tip move in one revolution = 1.194 meter

A hollow steel ball of diameter 3.0 m barely floats in water. What is the thickness of the wall of the ball? The density of iron is 7.87 g/cm3 and that of water is 1000 kg/m3. A) 37 cm B) 6.6 cm C) 79 cm D) 131 cm

Answers

Answer:

B) 6.6 cm

Explanation:

density steel 7750 to 8050 kg/m³, use 7870

density of water at 20C = 0.998 g/cm³ = 998 kg/m³

Note, the overall density must be equal to that of water, 998 kg/m³

density is the ratio of mass of a body to its volume

volume = V = ⁴/₃πr³ = ⁴/₃π(1.5)³ = 14.14 m³

Mass = 998 kg/m³ x 14.14 m³ = 14109 kg

Density of steel = 7870 kg/m³ = 14109 kg / V

V = 1.79 m³

deduct 1.79 m³ from the total volume of 14.14 m³

Volume of shell is ⁴/₃πr1³ – ⁴/₃πr2³ = ⁴/₃π(r1³ – r2³) = 1.79

divide ⁴/₃π from both sides

r1³ – r2³ = 0.428 m³

r2³ = (1.5)³ - 0.428

r2 = 1.434

to get the thickness we say that

the radius of the hollow steel ball -the radius of the ball

Thickness is 1.5 – 1.434 = 0.066 m or 6.6 cm

How many electrons will there be in 5 coulombs of charge? (the charge of one electron is 1.6 x 10^-19 Coulombs)
thanks!

Answers

There's no physics or electronics to this question.
It's just arithmetic.

The last part of the question TELLS you how many 'coulombs per electron'.

If you just flip that fraction (divide ' 1 ' by it, take its reciprocal), then
you'll have 'electrons per coulomb', and 5 of those will answer the question.

I got 31,250,000,000,000,000,000 . I could be wrong. You should check it.

What is it called when air particles spread apart?

Answers

When air particles bunch up, it's called a compression-rarefaction.
When the particles spread apart its called a rarefaction.

Which uses the refractive properties of light to separate it into its different wavelengths? A.
white light from the surface of a mirror

B.
colored light as it travels from a solid medium to a liquid medium

C.
visible light as it passes through a lens

D.
sunlight through droplets of water in the atmosphere

Answers

A). No. A mirror doesn't separate light into its different wavelengths.

B). No. Light doesn't separate into its different wavelengths when it
goes, say, from glass into water.

C). No. When light goes through your glasses, it doesn't separate
into its different wavelengths.

D). Yes ! When sunlight shines into droplets of water in the atmosphere,
it comes out separated into its different wavelengths. When we see that
happening in the air in front of us, we call it a "rainbow".

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On June 9, 1983, the lower part of the Variegated Glacier in Alaska was observed to be moving at a rate of 64 m per day. What is this speed in kilometers per hour?