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3 years ago

According to the nfpa, the upper human survivability limit is approximately:

1 answer:

5 0

The National Fire Protection Association (NFPA) states that the furthest reaches of human temperature viability is 212°F, well beneath temperatures found in most noteworthy structure fires that are past the development (early) stage. In the present fire conditions, temperatures higher than 500°F can be effortlessly gotten inside three to four minutes. Flashover, which happens at roughly 1,100°F, can grow well under five minutes.2 If a space isn't legitimate for firefighters, caught casualties aren't probably going to survive either. Set aside the opportunity to make it safe and keep your firefighters from going for broke.

<span>60% of the casualties were found to have been presented to warm (most at temperatures over 200°F; some were beneath) and mugginess for six to seven minutes (remote from the fire range).</span>

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At a distance of 11 cm from a presumably isotropic, radioactive source, a pair of students measure 65 cps (cps = counts per seco

Alborosie

To solve the problem, it is necessary the concepts related to the definition of area in a sphere, and the proportionality of the counts per second between the two distances.

The area with a certain radius and the number of counts per second is proportional to another with a greater or lesser radius, in other words,

$A_1*m=M*A_2$

$A_i =Area$

M,m = Counts per second

Our radios are given by

$r_1 = 11cm$

$R_2 = 20cm$

$m = 65cps$

Therefore replacing we have that,

$A_1*m=M*A_2$

$4\pi r_1^2*m = M * 4\pi R_2^2 M$

$r^2*m=MR^2$

$M = \frac{m*r^2}{R^2}$

$M = \frac{65*11^2}{20^2}$

$M = 19.6625cps$

Therefore the number of counts expect at a distance of 20 cm is 19.66cps

7 0

3 years ago

Help me please I will give you a crown!!!!

grigory [225]

Answer:

ID:6207328365

p.a.s.s:qwerty

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2 years ago

Read 2 more answers

Betelgeuse is how many times larger than the sun

Aleksandr-060686 [28]

Betelgeuse is one of the largest known stars and is probably at least the size of the orbits of Mars or Jupiter around the sun. That's a diameter about 700 times the size of the Sun or 600 million miles. For a star it has a rather low surface temperature (6000 F compared to the Sun's 10,000 F).

3 0

3 years ago

Which of the following statements explains why a race car going around a curve is accelerating, even if the speed is constant? A

Tom [10]

OPTION C The car is accelerating because the direction of velocity is changing explains why a race car going around a curve is accelerating, even if the speed is constant

When a body is in uniform circular motion ( constant speed ), it will continuously cheanges its direction and so the body is accelerating

The rate at which an item changes its velocity is known as acceleration, a vector variable. If an object's velocity is changing, it is accelerating.

As a vector quantity, acceleration has a direction attached to it. The acceleration vector's direction is determined by two factors: if the thing is slowing down or speeding up the direction the thing is travelling in (+ or -)

The following general rule is used to calculate acceleration:

An object's acceleration will be in the opposite direction of its velocity if it is slowing down.

You may use this basic concept to determine if an object's acceleration is positive or negative, to the right or left, up or down, etc.

To know more about acceleration visit : brainly.com/question/12550364

#SPJ4

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1 year ago

Explain why a 10 kg stone and 1 kg stone dropped from the same height

11111nata11111 [884]

The acceleration of a body in a gravitational field is independent of its mass. Both the stones will fall with the same acceleration through the same height and hence they will strike the ground simultaneously.
GIVE ME POINTS

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3 years ago