Heat flows from hot to cold to lower the temperature of hot areas and increase temperature of cold areas. The end result is that the 2 areas have the same temperature, thus increasing entropy.

7 0

4 years ago

Non-Alaskan grizzly bears are indicator species for mountain ecosystems. In the nineteenth century, the grizzly bear nearly went

Marina CMI [18]

Answer:

I think it is C.

Explanation:

I took a 12 question quiz in USA TP and made a 92%. It won't let me see which one I missed though.

Look up habitat fragmentation and think about how well it answers the question given.

5 0

4 years ago

How much energy is needed to heat and melt 3.0 kg of copper initially at 83°C?

Ne4ueva [31]

As we know that in order to melt the copper we need to take the temperature of copper to its melting point

So here heat required to raise the temperature of copper is given as

$Q = ms\Delta T$

We know that

melting temperature of copper = 1085 degree C

Specific heat capacity of copper = 385 J/kg C

now we have

$Q = 3(385)(1085 - 83)$

$Q = 1157310 J$

$Q = 1157.3 kJ$

now in order to melt the copper we know the heat required is

$Q = mL$

here we know that

L = 205 kJ/kg

now from above formula

$Q = 3(205) kJ$

$Q = 615 kJ$

now total heat required will be

$Q = 1157.3 kJ + 615 kJ$

$Q = 1772.3 kJ$

As we know that

$1 Cal = 4.18 kJ$

now we have

$Q = \frac{1772.3}{4.18} = 430 KCal$

6 0

3 years ago

g A has all the mass at the rim, while wheel B has the mass uniformly distributed, like a solid disk. The wheels have the same m

marishachu [46]

Answer:

The second wheel

Explanation:

The torque is given by

$\tau=I\alpha$ (1)

where I is the moment of inertia and a is the angular acceleration. If we take into account the moment of inertia of a disk and a ring ()for the first wheel) we have:

$I_r=mR^2\\I_d=\frac{1}{2}mR^2$

where we used that both wheel have the same mass. By replacing in (1) we obtain:

$\alpha_r=\frac{\tau}{I_r}=\frac{\tau}{mR^2}\\\alpha_d=\frac{\tau}{I_d}=\frac{\tau}{\frac{1}{2}mR^2}=2\alpha_r\\$

Hence, the second wheel (the disk) has a greater acceleration.

hope this help!!

5 0

4 years ago

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