All categories

3 years ago

according to many anthropologists a land brigade during the ice age allowing between which two countries

Physics

2 answers:

Jet001 [13]3 years ago

5 0

Continents: North America and Asia
Countries: Canada and Siberia, or Alaska (United States) and Siberia

ioda3 years ago

4 0

Well first of all, I think you're referring to the theory of the land "bridge",
not 'brigade'.

The main problem with this question is that during the Ice Age,
there were no countries, so there are no names to answer with.

The suspected land bridge spanned the expanse of open water
that would come to be called the 'Bering Strait' millions of years
later, after the bridge was long gone. Its ends would have been
located on land in different parts of what would come to be known
as Mother Russia far in the future. And even later, after another
couple hundred years, one of those ends would cease to be part
of Russia and would become part of the USA. But as I said earlier,
during the time that the land bridge existed, there were no countries.

You might be interested in

Fitness results come from hard work, not an instant fix Question 1 options: True False

zhannawk [14.2K]

This is a true statement. Fitness is typically a long-term solution, not a short-term repair. When looking for fitness results, it will usually take weeks to months to see any tangible results, even though there could be some short-term benefits such as increased energy. This is why fitness is sometimes seen as a lifetime endeavor and not one that occurs overnight.

5 0

3 years ago

ANSWER ASAP - Define, describe and solve for speed, velocity, and acceleration

Vitek1552 [10]

Answer:

Accelrtation:a vehicle's capacity to gain speed within a short time.EX:An object was moving north at 10 meters per second.

Velociy:the speed of something in a given direction EX:Velocity is the rate of motion, speed or action. An example of velocity is a car driving at 75 miles per hour.

Explanation:

4 0

3 years ago

Air enters an adiabatic compressor at 104 kPa and 292 K and exits at a temperature of 565 K. Determine the power (kW) for the co

ladessa [460]

Answer:

$\dot W_{in} = 49.386\,kW$

Explanation:

An adiabatic compressor is modelled as follows by using the First Law of Thermodynamics:

$\dot W_{in} + \dot m \cdot c_{p}\cdot (T_{1}-T_{2}) = 0$

The power consumed by the compressor can be calculated by the following expression:

$\dot W_{in} = \dot m \cdot c_{v}\cdot (T_{2}-T_{1})$

Let consider that air behaves ideally. The density of air at inlet is:

$P\cdot V = n\cdot R_{u}\cdot T$

$P\cdot V = \frac{m}{M}\cdot R_{u}\cdot T$

$\rho = \frac{P\cdot M}{R_{u}\cdot T}$

$\rho = \frac{(104\,kPa)\cdot (28.02\,\frac{kg}{kmol})}{(8.315\,\frac{kPa\cdot m^{3}}{kmol\cdot K} )\cdot (292\,K)}$

$\rho = 1.2\,\frac{kg}{m^{3}}$

The mass flow through compressor is:

$\dot m = \rho \cdot \dot V$

$\dot m = (1.2\,\frac{kg}{m^{3}})\cdot (0.15\,\frac{m^{3}}{s} )$

$\dot m = 0.18\,\frac{kg}{s}$

The work input is:

$\dot W_{in} = (0.18\,\frac{kg}{s} )\cdot (1.005\,\frac{kJ}{kg\cdot K})\cdot (565\,K-292\,K)$

$\dot W_{in} = 49.386\,kW$

5 0

3 years ago

Use the worked example above to help you solve this problem. An Eskimo returning from a successful fishing trip pulls a sled loa

Alex787 [66]

Answer:

(a)

W_friction = 98.1 J

W_net = 550.9 J

(b)

W_friction = 98.1 J

W_net = 463.95 J

Explanation:

(a)

First, we will calculate the work done by friction:

$W_{friction} = \mu R = \mu W = \mu mg\\W_{friction} = (0.2)(50\ kg)(9.81\ m/s^2)\\$

W_friction = 98.1 J

Now, the work done by Eskimo will be:

$W_{Eskimo} = FdCos\theta\\W_{Eskimo} = (110\ N)(5.9\ m)Cos\ 0^o\\$

W_Eskimo = 649 J

So, the net work will be:

W_net = W_{Eskimo} - W_{friction}

W_net = 649 J - 98.1 J

W_net = 550.9 J

(b)

First, we will calculate the work done by friction:

$W_{friction} = \mu R = \mu W = \mu mg\\W_{friction} = (0.2)(50\ kg)(9.81\ m/s^2)\\$

W_friction = 98.1 J

Now, the work done by Eskimo will be:

$W_{Eskimo} = FdCos\theta\\W_{Eskimo} = (110\ N)(5.9\ m)Cos\ 30^o\\$

W_Eskimo = 562.05 J

So, the net work will be:

W_net = W_{Eskimo} - W_{friction}

W_net = 562.05 J - 98.1 J

W_net = 463.95 J

4 0

3 years ago

How does the size of the ears help to keep an artic fox warm in a cold environment?

Mice21 [21]

As the artic fox has very small ears it helps prevent the heat from his body from escaping quickly.
The bigger the ears the faster the heat escapes basically.

7 0

4 years ago