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3 years ago

What is the speed of light ?

Physics

1 answer:

Brrunno [24]3 years ago

3 0

Answer:

299792458 metres per second

Explanation:

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3 years ago

High-altitude mountain climbers do not eat snow, but always melt it first with a stove. To see why, calculate the energy absorbe

Vikki [24]

Answer:

a) $Q=467443.8\ J$

b) $Q_m=299700\ J$

c) $Q_2=131859\ J$

Explanation:

Given:

specific heat of ice, $c_i=2100\ J.kg^{-1}.^{\circ}C^{-1}$

latent heat of fusion of ice, $L=333000\ J.kg^{-1}$

specific heat of water, $c_w=4186\ J.kg^{-1}.^{\circ}C^{-1}$

(a)

mass of snow, $m_s=0.9\ kg$

initial temperature of snow, $T_{is}=-15^{\circ}C$

Final temperature of the consumed mass, $T_f=37^{\circ}C$

Now the energy absorbed from the body after eating this snow:

$Q=m_s.c_i.\Delta T_i+m_s.L+m_s.c_w.\Delta T_w$

$Q=0.9\times 2100\times (0-(-15))+0.9\times 333000+0.9\times 4186\times (37-0)$

$Q=467443.8\ J$

(b)

Energy absorbed from the body in melting the ice is the total latent heat:

$Q_m=m_s.L$

$Q_m=0.9\times 333000$

$Q_m=299700\ J$

(c)

initial temperature of water, $T_{iw}=2^{\circ}C$

final temperature of water, $T_{iw}=37^{\circ}C$

Now, the amount of energy invested by body for the water at this condition:

$Q_2=m_s.c_w.\Delta T_2$

$Q_2=0.9\times 4186\times (37-2)$

$Q_2=131859\ J$

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3 years ago

If a cart of 2 kg mass has a force of 8 newtons exerted on it, what is its acceleration?

Ilia_Sergeevich [38]

Force = mass * acceleration

F = ma

8 N = 2 kg * a

8 = 2a

2a = 8

a = 8/2 = 4

acceleration = 4 m/s²

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3 years ago

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Estimate the mass of water that must evaporate from the skin to cool the body by 0.45 ∘C. Assume a body mass of 95 kg and assume

hram777 [196]

Answer:

0.0757 kg

Explanation:

m = mass of the body = 95 kg = 95000 g

ΔT = change in the temperature of the body = 0.45 °C

c = specific heat capacity of the body = 4.0 J/(g °C)

M = mass of water evaporated

L = latent heat of vaporization of water = 2260 J/g

Using conservation of heat

Heat gained by water = heat lost by body

ML = m c ΔT

M (2260) = (95000) (4.0) (0.45)

M = 75.7 g

M = 0.0757 kg

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3 years ago

What is the speed of light ?​

What is the speed of light ?