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3 years ago

Why the dogs lays down next to the wood stove? Is it radiation,convection,conduction?

Physics

1 answer:

malfutka [58]3 years ago

4 0

Radiation because it radiates the heat in there body therefore making them hot.

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An unknown material, m1 = 0.49 kg, at a temperature of T1 = 92 degrees C is added to a Dewer (an insulated container) which cont

erastova [34]

Answer:

$c_u=1540.5J/kg^{\circ}K$

Explanation:

We know that heat relates to mass, specific heat and variation of temperature experimented because of this heat through the equation $Q=mc\Delta T=mc(T_f-T_i)$ . The heat released by the unknown material is absorbed by water, so we have $Q_u=-Q_w$ , and we can write:

$m_uc_u(T_{uf}-T_{ui})=-m_wc_w(T_{wf}-T_{wi})$

Since thermal equilibrium is reached we know that $T_{cf}=T_{wf}=T_f=31^{\circ}C=304^{\circ}K$ , where we have added $273^{\circ}$ to convert the temperature from Celsius to Kelvin, as <em>we must do</em>. Since we want the specific heat of the unknown material, we do:

$c_u=-\frac{m_wc_w(T_f-T_{wi})}{m_u(T_f-T_{ui})}$

Which for our values is:

$c_u=-\frac{(1.1kg)(4186J/kg^{\circ}K)((304^{\circ}K)-(294^{\circ}K))}{(0.49kg)((304^{\circ}K)-(365^{\circ}K))}=1540.5J/kg^{\circ}K$

3 0

3 years ago

In a thundercloud there may be electric charges of 45.0 C near the top of the cloud and -45.0 C near the bottom of the cloud. Th

Gala2k [10]

Answer:

The electric force on the top charge is $F=3.44\times 10^6\ N$ .

Explanation:

Given that,

Electric charges in a thundercloud, $q_1=q_2=45\ C$

The distance between charges, d = 2.3 km = 2300 m

Let F is the electric force on the top charge. The electric force is given by the formula as :

$F=\dfrac{kq^2}{d^2}$

$F=\dfrac{9\times 10^9\times (45)^2}{(2300)^2}$

$F=3445179.58\ N$

$F=3.44\times 10^6\ N$

So, the electric force on the top charge is $F=3.44\times 10^6\ N$ . Hence, this is the required solution.

7 0

3 years ago

A 0.3423 g sample of pentane, C5H12, was burned in a bomb (constant-volume) calorimeter. The temperature of the calorimeter and

Yakvenalex [24]

Answer:

16.82 kJ/g

Explanation:

The Heat energy generated by the pentance combusion caused the temperature increasing of the caloriemeter and the water inside it.

Heat energy of a substace can be calculated using

Q = mcθ

C= mc

where Q = Heat energy

m =mass

c = specific heat capacity

C = heat capacity

θ =temperature difference

(Temperature difference = final temperature - initial temperature.)

heat absorbed by water = mcθ

= 1 * 4.184 * (22.82-20.22)

= 10.88 J --------------(1)

heat absorbed by calorimeter = Cθ

= 2210 *(22.82-20.22)

= 5746 J ---------------(2)

Combustion energy = heat absorbed by water + heat absorbed by calorimeter

Combustion energy = 10.88+ 5746 = 5756.88 J

= 5.757 kJ

heat of combustion of pentane = Combustion energy / mass

= 5.757 / 0.3423

= 16.82 kJ/g

8 0

3 years ago

State and explain in terms of the forces acting how the acceleration of the object varies during its fall?

zloy xaker [14]

Answer: State and explain, in terms of the forces acting,how the acceleration of the object varies during its fall. As the object is released two forces act on it. Its weight and and air resistance. At this point its weight is much greater due to the force of gravity on the object so it accelerates downward.

https://www.mytutor.co.uk › Physics

4 0

3 years ago

ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements. In working this probl

Anni [7]

Answer:

i think it is b sorry if im worng

8 0

3 years ago

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